Source

emacs / lisp / ses.el

Full commit
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
;;; ses.el -- Simple Emacs Spreadsheet  -*- coding: utf-8 -*-

;; Copyright (C) 2002, 2003, 2004, 2005, 2006  Free Software Foundation, Inc.

;; Author: Jonathan Yavner <jyavner@member.fsf.org>
;; Maintainer: Jonathan Yavner <jyavner@member.fsf.org>
;; Keywords: spreadsheet

;; This file is part of GNU Emacs.

;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.

;;; Commentary:

;;; To-do list:

;; * Use $ or … for truncated fields
;; * Add command to make a range of columns be temporarily invisible.
;; * Allow paste of one cell to a range of cells -- copy formula to each.
;; * Do something about control characters & octal codes in cell print
;;   areas.  Use string-width?
;; * Input validation functions.  How specified?
;; * Faces (colors & styles) in print cells.
;; * Move a column by dragging its letter in the header line.
;; * Left-margin column for row number.
;; * Move a row by dragging its number in the left-margin.


;;; Code:

(require 'unsafep)


;;----------------------------------------------------------------------------
;; User-customizable variables
;;----------------------------------------------------------------------------

(defgroup ses nil
  "Simple Emacs Spreadsheet."
  :group  'applications
  :prefix "ses-"
  :version "21.1")

(defcustom ses-initial-size '(1 . 1)
  "Initial size of a new spreadsheet, as a cons (NUMROWS . NUMCOLS)."
  :group 'ses
  :type '(cons (integer :tag "numrows") (integer :tag "numcols")))

(defcustom ses-initial-column-width 7
  "Initial width of columns in a new spreadsheet."
  :group 'ses
  :type '(integer :match (lambda (widget value) (> value 0))))

(defcustom ses-initial-default-printer "%.7g"
  "Initial default printer for a new spreadsheet."
  :group 'ses
  :type  '(choice string
		  (list :tag "Parenthesized string" string)
		  function))

(defcustom ses-after-entry-functions '(forward-char)
  "Things to do after entering a value into a cell.
An abnormal hook that usually runs a cursor-movement function.
Each function is called with ARG=1."
  :group 'ses
  :type 'hook
  :options '(forward-char backward-char next-line previous-line))

(defcustom ses-mode-hook nil
  "Hook functions to be run upon entering SES mode."
  :group 'ses
  :type 'hook)


;;----------------------------------------------------------------------------
;; Global variables and constants
;;----------------------------------------------------------------------------

(defvar ses-read-cell-history nil
  "List of formulas that have been typed in.")

(defvar ses-read-printer-history nil
  "List of printer functions that have been typed in.")

(easy-menu-define ses-header-line-menu nil
  "Context menu when mouse-3 is used on the header-line in an SES buffer."
  '("SES header row"
    ["Set current row" ses-set-header-row t]
    ["Unset row" ses-unset-header-row (> ses--header-row 0)]))

(defconst ses-mode-map
  (let ((keys `("\C-c\M-\C-l" ses-reconstruct-all
		"\C-c\C-l"    ses-recalculate-all
		"\C-c\C-n"    ses-renarrow-buffer
		"\C-c\C-c"    ses-recalculate-cell
		"\C-c\M-\C-s" ses-sort-column
		"\C-c\M-\C-h" ses-set-header-row
		"\C-c\C-t"    ses-truncate-cell
		"\C-c\C-j"    ses-jump
		"\C-c\C-p"    ses-read-default-printer
		"\M-\C-l"     ses-reprint-all
		[?\S-\C-l]    ses-reprint-all
		[header-line down-mouse-3] ,ses-header-line-menu
		[header-line mouse-2] ses-sort-column-click))
	(newmap (make-sparse-keymap)))
    (while keys
      (define-key (1value newmap) (car keys) (cadr keys))
      (setq keys (cddr keys)))
    newmap)
  "Local keymap for Simple Emacs Spreadsheet.")

(easy-menu-define ses-menu ses-mode-map
  "Menu bar menu for SES."
  '("SES"
    ["Insert row" ses-insert-row (ses-in-print-area)]
    ["Delete row" ses-delete-row (ses-in-print-area)]
    ["Insert column" ses-insert-column (ses-in-print-area)]
    ["Delete column" ses-delete-column (ses-in-print-area)]
    ["Set column printer" ses-read-column-printer t]
    ["Set column width" ses-set-column-width t]
    ["Set default printer" ses-read-default-printer t]
    ["Jump to cell" ses-jump t]
    ["Set cell printer" ses-read-cell-printer t]
    ["Recalculate cell" ses-recalculate-cell t]
    ["Truncate cell display" ses-truncate-cell t]
    ["Export values" ses-export-tsv t]
    ["Export formulas" ses-export-tsf t]))

(defconst ses-mode-edit-map
  (let ((keys '("\C-c\C-r"    ses-insert-range
		"\C-c\C-s"    ses-insert-ses-range
		[S-mouse-3]   ses-insert-range-click
		[C-S-mouse-3] ses-insert-ses-range-click
		"\M-\C-i"     lisp-complete-symbol))
	(newmap (make-sparse-keymap)))
    (set-keymap-parent newmap minibuffer-local-map)
    (while keys
      (define-key newmap (pop keys) (pop keys)))
    newmap)
  "Local keymap for SES minibuffer cell-editing.")

;Local keymap for SES print area
(defalias 'ses-mode-print-map
  (let ((keys '([backtab] backward-char
		[tab]     ses-forward-or-insert
		"\C-i"	  ses-forward-or-insert  ;Needed for ses-coverage.el?
		"\M-o"    ses-insert-column
		"\C-o"	  ses-insert-row
		"\C-m"    ses-edit-cell
		"\M-k"    ses-delete-column
		"\M-y"	  ses-yank-pop
		"\C-k"    ses-delete-row
		"\C-j"    ses-append-row-jump-first-column
		"\M-h"    ses-mark-row
		"\M-H"	  ses-mark-column
		"\C-d"	  ses-clear-cell-forward
		"\C-?"	  ses-clear-cell-backward
		"("       ses-read-cell
		"\""      ses-read-cell
		"'"       ses-read-symbol
		"="	  ses-edit-cell
		"j"	  ses-jump
		"p"	  ses-read-cell-printer
		"w"	  ses-set-column-width
		"x"	  ses-export-keymap
		"\M-p"	  ses-read-column-printer))
	(repl '(;;We'll replace these wherever they appear in the keymap
		clipboard-kill-region ses-kill-override
		end-of-line	      ses-end-of-line
		kill-line	      ses-delete-row
		kill-region           ses-kill-override
		open-line	      ses-insert-row))
	(numeric "0123456789.-")
	(newmap (make-keymap)))
    ;;Get rid of printables
    (suppress-keymap newmap t)
    ;;These keys insert themselves as the beginning of a numeric value
    (dotimes (x (length numeric))
      (define-key newmap (substring numeric x (1+ x)) 'ses-read-cell))
    ;;Override these global functions wherever they're bound
    (while repl
      (substitute-key-definition (car repl) (cadr repl) newmap
				 (current-global-map))
      (setq repl (cddr repl)))
    ;;Apparently substitute-key-definition doesn't catch this?
    (define-key newmap [(menu-bar) edit cut] 'ses-kill-override)
    ;;Define our other local keys
    (while keys
      (define-key newmap (car keys) (cadr keys))
      (setq keys (cddr keys)))
    newmap))

;;Helptext for ses-mode wants keymap as variable, not function
(defconst ses-mode-print-map (symbol-function 'ses-mode-print-map))

;;Key map used for 'x' key.
(defalias 'ses-export-keymap
  (let ((map (make-sparse-keymap "SES export")))
    (define-key map "T" (cons " tab-formulas" 'ses-export-tsf))
    (define-key map "t" (cons " tab-values" 'ses-export-tsv))
    map))

(defconst ses-print-data-boundary "\n\014\n"
  "Marker string denoting the boundary between print area and data area.")

(defconst ses-initial-global-parameters
  "\n( ;Global parameters (these are read first)\n 2 ;SES file-format\n 1 ;numrows\n 1 ;numcols\n)\n\n"
  "Initial contents for the three-element list at the bottom of the data area.")

(defconst ses-initial-file-trailer
  ";; Local Variables:\n;; mode: ses\n;; End:\n"
  "Initial contents for the file-trailer area at the bottom of the file.")

(defconst ses-initial-file-contents
  (concat "       \n" ;One blank cell in print area
	  ses-print-data-boundary
	  "(ses-cell A1 nil nil nil nil)\n" ;One blank cell in data area
	  "\n" ;End-of-row terminator for the one row in data area
	  "(ses-column-widths [7])\n"
	  "(ses-column-printers [nil])\n"
	  "(ses-default-printer \"%.7g\")\n"
	  "(ses-header-row 0)\n"
	  ses-initial-global-parameters
	  ses-initial-file-trailer)
  "The initial contents of an empty spreadsheet.")

(defconst ses-box-prop '(:box (:line-width 2 :style released-button))
  "Display properties to create a raised box for cells in the header line.")

(defconst ses-standard-printer-functions
  '(ses-center ses-center-span ses-dashfill ses-dashfill-span
    ses-tildefill-span)
  "List of print functions to be included in initial history of printer
functions.  None of these standard-printer functions is suitable for use as a
column printer or a global-default printer because they invoke the column or
default printer and then modify its output.")


;;----------------------------------------------------------------------------
;; Local variables and constants
;;----------------------------------------------------------------------------

(eval-and-compile
  (defconst ses-localvars
    '(ses--blank-line ses--cells ses--col-printers ses--col-widths ses--curcell
      ses--curcell-overlay ses--default-printer ses--deferred-narrow
      ses--deferred-recalc ses--deferred-write ses--file-format
      ses--header-hscroll ses--header-row ses--header-string ses--linewidth
      ses--numcols ses--numrows ses--symbolic-formulas ses--data-marker
      ses--params-marker
      ;;Global variables that we override
      mode-line-process next-line-add-newlines transient-mark-mode)
    "Buffer-local variables used by SES."))

;;When compiling, create all the buffer locals and give them values
(eval-when-compile
  (dolist (x ses-localvars)
    (make-local-variable x)
    (set x nil)))

(defconst ses-paramlines-plist
  '(ses--col-widths  -5 ses--col-printers -4 ses--default-printer -3
    ses--header-row  -2 ses--file-format   1 ses--numrows          2
    ses--numcols      3)
  "Offsets from 'Global parameters' line to various parameter lines in the
data area of a spreadsheet.")


;;
;;  "Side-effect variables".  They are set in one function, altered in
;;  another as a side effect, then read back by the first, as a way of
;;  passing back more than one value.  These declarations are just to make
;;  the compiler happy, and to conform to standard Emacs-Lisp practice (I
;;  think the make-local-variable trick above is cleaner).
;;

(defvar ses-relocate-return nil
  "Set by `ses-relocate-formula' and `ses-relocate-range', read by
`ses-relocate-all'.  Set to 'delete if a cell-reference was deleted from a
formula--so the formula needs recalculation.  Set to 'range if the size of a
`ses-range' was changed--so both the formula's value and list of dependents
need to be recalculated.")

(defvar ses-call-printer-return nil
  "Set to t if last cell printer invoked by `ses-call-printer' requested
left-justification of the result.  Set to error-signal if ses-call-printer
encountered an error during printing.  Nil otherwise.")

(defvar ses-start-time nil
  "Time when current operation started.  Used by `ses-time-check' to decide
when to emit a progress message.")


;;----------------------------------------------------------------------------
;; Macros
;;----------------------------------------------------------------------------

(defmacro ses-get-cell (row col)
  "Return the cell structure that stores information about cell (ROW,COL)."
  `(aref (aref ses--cells ,row) ,col))

;; We might want to use defstruct here, but cells are explicitly used as
;; arrays in ses-set-cell, so we'd need to fix this first.  --Stef
(defsubst ses-make-cell (&optional symbol formula printer references)
  (vector symbol formula printer references))

(defmacro ses-cell-symbol (row &optional col)
  "From a CELL or a pair (ROW,COL), get the symbol that names the local-variable holding its value.  (0,0) => A1."
  `(aref ,(if col `(ses-get-cell ,row ,col) row) 0))

(defmacro ses-cell-formula (row &optional col)
  "From a CELL or a pair (ROW,COL), get the function that computes its value."
  `(aref ,(if col `(ses-get-cell ,row ,col) row) 1))

(defmacro ses-cell-printer (row &optional col)
  "From a CELL or a pair (ROW,COL), get the function that prints its value."
  `(aref ,(if col `(ses-get-cell ,row ,col) row) 2))

(defmacro ses-cell-references (row &optional col)
  "From a CELL or a pair (ROW,COL), get the list of symbols for cells whose
functions refer to its value."
  `(aref ,(if col `(ses-get-cell ,row ,col) row) 3))

(defmacro ses-cell-value (row &optional col)
  "From a CELL or a pair (ROW,COL), get the current value for that cell."
  `(symbol-value (ses-cell-symbol ,row ,col)))

(defmacro ses-col-width (col)
  "Return the width for column COL."
  `(aref ses--col-widths ,col))

(defmacro ses-col-printer (col)
  "Return the default printer for column COL."
  `(aref ses--col-printers ,col))

(defmacro ses-sym-rowcol (sym)
  "From a cell-symbol SYM, gets the cons (row . col).  A1 => (0 . 0).  Result
is nil if SYM is not a symbol that names a cell."
  `(and (symbolp ,sym) (get ,sym 'ses-cell)))

(defmacro ses-cell (sym value formula printer references)
  "Load a cell SYM from the spreadsheet file.  Does not recompute VALUE from
FORMULA, does not reprint using PRINTER, does not check REFERENCES.  This is a
macro to prevent propagate-on-load viruses.  Safety-checking for FORMULA and
PRINTER are deferred until first use."
  (let ((rowcol (ses-sym-rowcol sym)))
    (ses-formula-record formula)
    (ses-printer-record printer)
    (or (atom formula)
	(eq safe-functions t)
	(setq formula `(ses-safe-formula ,formula)))
    (or (not printer)
	(stringp printer)
	(eq safe-functions t)
	(setq printer `(ses-safe-printer ,printer)))
    (aset (aref ses--cells (car rowcol))
	  (cdr rowcol)
	  (ses-make-cell sym formula printer references)))
  (set sym value)
  sym)

(defmacro ses-column-widths (widths)
  "Load the vector of column widths from the spreadsheet file.  This is a
macro to prevent propagate-on-load viruses."
  (or (and (vectorp widths) (= (length widths) ses--numcols))
      (error "Bad column-width vector"))
  ;;To save time later, we also calculate the total width of each line in the
  ;;print area (excluding the terminating newline)
  (setq ses--col-widths widths
	ses--linewidth  (apply '+ -1 (mapcar '1+ widths))
	ses--blank-line (concat (make-string ses--linewidth ?\s) "\n"))
  t)

(defmacro ses-column-printers (printers)
  "Load the vector of column printers from the spreadsheet file and checks
them for safety.  This is a macro to prevent propagate-on-load viruses."
  (or (and (vectorp printers) (= (length printers) ses--numcols))
      (error "Bad column-printers vector"))
  (dotimes (x ses--numcols)
    (aset printers x (ses-safe-printer (aref printers x))))
  (setq ses--col-printers printers)
  (mapc 'ses-printer-record printers)
  t)

(defmacro ses-default-printer (def)
  "Load the global default printer from the spreadsheet file and checks it
for safety.  This is a macro to prevent propagate-on-load viruses."
  (setq ses--default-printer (ses-safe-printer def))
  (ses-printer-record def)
  t)

(defmacro ses-header-row (row)
  "Load the header row from the spreadsheet file and checks it
for safety.  This is a macro to prevent propagate-on-load viruses."
  (or (and (wholenump row) (or (zerop ses--numrows) (< row ses--numrows)))
      (error "Bad header-row"))
  (setq ses--header-row row)
  t)

(defmacro ses-dorange (curcell &rest body)
  "Execute BODY repeatedly, with the variables `row' and `col' set to each
cell in the range specified by CURCELL.  The range is available in the
variables `minrow', `maxrow', `mincol', and `maxcol'."
  (declare (indent defun) (debug (form body)))
  (let ((cur (make-symbol "cur"))
	(min (make-symbol "min"))
	(max (make-symbol "max"))
	(r   (make-symbol "r"))
	(c   (make-symbol "c")))
    `(let* ((,cur ,curcell)
	    (,min (ses-sym-rowcol (if (consp ,cur) (car ,cur) ,cur)))
	    (,max (ses-sym-rowcol (if (consp ,cur) (cdr ,cur) ,cur))))
       (let ((minrow (car ,min))
	     (maxrow (car ,max))
	     (mincol (cdr ,min))
	     (maxcol (cdr ,max))
	     row col)
	 (if (or (> minrow maxrow) (> mincol maxcol))
	     (error "Empty range"))
	 (dotimes (,r (- maxrow minrow -1))
	   (setq row (+ ,r minrow))
	   (dotimes (,c (- maxcol mincol -1))
	     (setq col (+ ,c mincol))
	     ,@body))))))

;;Support for coverage testing.
(defmacro 1value (form)
  "For code-coverage testing, indicate that FORM is expected to always have
the same value."
  form)
(defmacro noreturn (form)
  "For code-coverage testing, indicate that FORM will always signal an error."
  form)


;;----------------------------------------------------------------------------
;; Utility functions
;;----------------------------------------------------------------------------

(defun ses-vector-insert (array idx new)
  "Create a new vector which is one larger than ARRAY and has NEW inserted
before element IDX."
  (let* ((len    (length array))
	 (result (make-vector (1+ len) new)))
    (dotimes (x len)
      (aset result
	    (if (< x idx) x (1+ x))
	    (aref array x)))
    result))

;;Allow ARRAY to be a symbol for use in buffer-undo-list
(defun ses-vector-delete (array idx count)
  "Create a new vector which is a copy of ARRAY with COUNT objects removed
starting at element IDX.  ARRAY is either a vector or a symbol whose value
is a vector--if a symbol, the new vector is assigned as the symbol's value."
  (let* ((a      (if (arrayp array) array (symbol-value array)))
	 (len    (- (length a) count))
	 (result (make-vector len nil)))
    (dotimes (x len)
      (aset result x (aref a (if (< x idx) x (+ x count)))))
    (if (symbolp array)
	(set array result))
    result))

(defun ses-delete-line (count)
  "Like `kill-line', but no kill ring."
  (let ((pos (point)))
    (forward-line count)
    (delete-region pos (point))))

(defun ses-printer-validate (printer)
  "Signals an error if PRINTER is not a valid SES cell printer."
  (or (not printer)
      (stringp printer)
      (functionp printer)
      (and (stringp (car-safe printer)) (not (cdr printer)))
      (error "Invalid printer function"))
  printer)

(defun ses-printer-record (printer)
  "Add PRINTER to `ses-read-printer-history' if not already there, after first
checking that it is a valid printer function."
  (ses-printer-validate printer)
  ;;To speed things up, we avoid calling prin1 for the very common "nil" case.
  (if printer
      (add-to-list 'ses-read-printer-history (prin1-to-string printer))))

(defun ses-formula-record (formula)
  "If FORMULA is of the form 'symbol, adds it to the list of symbolic formulas
for this spreadsheet."
  (when (and (eq (car-safe formula) 'quote)
	     (symbolp (cadr formula)))
    (add-to-list 'ses--symbolic-formulas
		 (list (symbol-name (cadr formula))))))

(defun ses-column-letter (col)
  "Converts a column number to A..Z or AA..ZZ"
  (if (< col 26)
      (char-to-string (+ ?A col))
    (string (+ ?@ (/ col 26)) (+ ?A (% col 26)))))

(defun ses-create-cell-symbol (row col)
  "Produce a symbol that names the cell (ROW,COL).  (0,0) => 'A1."
  (intern (concat (ses-column-letter col) (number-to-string (1+ row)))))

(defun ses-create-cell-variable-range (minrow maxrow mincol maxcol)
  "Create buffer-local variables for cells.  This is undoable."
  (push `(apply ses-destroy-cell-variable-range ,minrow ,maxrow ,mincol ,maxcol)
	buffer-undo-list)
  (let (sym xrow xcol)
    (dotimes (row (1+ (- maxrow minrow)))
      (dotimes (col (1+ (- maxcol mincol)))
	(setq xrow (+ row minrow)
	      xcol (+ col mincol)
	      sym  (ses-create-cell-symbol xrow xcol))
	(put sym 'ses-cell (cons xrow xcol))
	(make-local-variable sym)))))

;;We do not delete the ses-cell properties for the cell-variables, in case a
;;formula that refers to this cell is in the kill-ring and is later pasted
;;back in.
(defun ses-destroy-cell-variable-range (minrow maxrow mincol maxcol)
  "Destroy buffer-local variables for cells.  This is undoable."
  (let (sym)
    (dotimes (row (1+ (- maxrow minrow)))
      (dotimes (col (1+ (- maxcol mincol)))
	(setq sym (ses-create-cell-symbol (+ row minrow) (+ col mincol)))
	(if (boundp sym)
	    (push `(apply ses-set-with-undo ,sym ,(symbol-value sym))
		  buffer-undo-list))
	(kill-local-variable sym))))
  (push `(apply ses-create-cell-variable-range ,minrow ,maxrow ,mincol ,maxcol)
	buffer-undo-list))

(defun ses-reset-header-string ()
  "Flags the header string for update.  Upon undo, the header string will be
updated again."
  (push '(apply ses-reset-header-string) buffer-undo-list)
  (setq ses--header-hscroll -1))

;;Split this code off into a function to avoid coverage-testing difficulties
(defun ses-time-check (format arg)
  "If `ses-start-time' is more than a second ago, call `message' with FORMAT
and (eval ARG) and reset `ses-start-time' to the current time."
  (when (> (- (float-time) ses-start-time) 1.0)
    (message format (eval arg))
    (setq ses-start-time (float-time)))
  nil)


;;----------------------------------------------------------------------------
;; The cells
;;----------------------------------------------------------------------------

(defun ses-set-cell (row col field val)
  "Install VAL as the contents for field FIELD (named by a quoted symbol) of
cell (ROW,COL).  This is undoable.  The cell's data will be updated through
`post-command-hook'."
  (let ((cell (ses-get-cell row col))
	(elt  (plist-get '(value t symbol 0 formula 1 printer 2 references 3)
			 field))
	change)
    (or elt (signal 'args-out-of-range nil))
    (setq change (if (eq elt t)
		     (ses-set-with-undo (ses-cell-symbol cell) val)
		   (ses-aset-with-undo cell elt val)))
    (if change
	(add-to-list 'ses--deferred-write (cons row col))))
  nil) ;Make coverage-tester happy

(defun ses-cell-set-formula (row col formula)
  "Store a new formula for (ROW . COL) and enqueues the cell for
recalculation via `post-command-hook'.  Updates the reference lists for the
cells that this cell refers to.  Does not update cell value or reprint the
cell.  To avoid inconsistencies, this function is not interruptible, which
means Emacs will crash if FORMULA contains a circular list."
  (let* ((cell (ses-get-cell row col))
	 (old  (ses-cell-formula cell)))
    (let ((sym    (ses-cell-symbol cell))
	  (oldref (ses-formula-references old))
	  (newref (ses-formula-references formula))
	  (inhibit-quit t)
	  x xrow xcol)
      (add-to-list 'ses--deferred-recalc sym)
      ;;Delete old references from this cell.  Skip the ones that are also
      ;;in the new list.
      (dolist (ref oldref)
	(unless (memq ref newref)
	  (setq x    (ses-sym-rowcol ref)
		xrow (car x)
		xcol (cdr x))
	  (ses-set-cell xrow xcol 'references
			(delq sym (ses-cell-references xrow xcol)))))
      ;;Add new ones.  Skip ones left over from old list
      (dolist (ref newref)
	(setq x    (ses-sym-rowcol ref)
	      xrow (car x)
	      xcol (cdr x)
	      x    (ses-cell-references xrow xcol))
	(or (memq sym x)
	    (ses-set-cell xrow xcol 'references (cons sym x))))
      (ses-formula-record formula)
      (ses-set-cell row col 'formula formula))))

(defun ses-calculate-cell (row col force)
  "Calculate and print the value for cell (ROW,COL) using the cell's formula
function and print functions, if any.  Result is nil for normal operation, or
the error signal if the formula or print function failed.  The old value is
left unchanged if it was *skip* and the new value is nil.
  Any cells that depend on this cell are queued for update after the end of
processing for the current keystroke, unless the new value is the same as
the old and FORCE is nil."
  (let ((cell (ses-get-cell row col))
	formula-error printer-error)
    (let ((oldval  (ses-cell-value   cell))
	  (formula (ses-cell-formula cell))
	  newval)
      (if (eq (car-safe formula) 'ses-safe-formula)
	  (ses-set-cell row col 'formula (ses-safe-formula (cadr formula))))
      (condition-case sig
	  (setq newval (eval formula))
	(error
	 (setq formula-error sig
	       newval        '*error*)))
      (if (and (not newval) (eq oldval '*skip*))
	  ;;Don't lose the *skip* - previous field spans this one
	  (setq newval '*skip*))
      (when (or force (not (eq newval oldval)))
	(add-to-list 'ses--deferred-write (cons row col)) ;In case force=t
	(ses-set-cell row col 'value newval)
	(dolist (ref (ses-cell-references cell))
	  (add-to-list 'ses--deferred-recalc ref))))
    (setq printer-error (ses-print-cell row col))
    (or formula-error printer-error)))

(defun ses-clear-cell (row col)
  "Delete formula and printer for cell (ROW,COL)."
  (ses-set-cell row col 'printer nil)
  (ses-cell-set-formula row col nil))

(defun ses-update-cells (list &optional force)
  "Recalculate cells in LIST, checking for dependency loops.  Prints
progress messages every second.  Dependent cells are not recalculated
if the cell's value is unchanged and FORCE is nil."
  (let ((ses--deferred-recalc list)
	(nextlist             list)
	(pos		      (point))
	curlist prevlist rowcol formula)
    (with-temp-message " "
      (while (and ses--deferred-recalc (not (equal nextlist prevlist)))
	;;In each loop, recalculate cells that refer only to other cells that
	;;have already been recalculated or aren't in the recalculation
	;;region.  Repeat until all cells have been processed or until the
	;;set of cells being worked on stops changing.
	(if prevlist
	    (message "Recalculating... (%d cells left)"
		     (length ses--deferred-recalc)))
	(setq curlist              ses--deferred-recalc
	      ses--deferred-recalc nil
	      prevlist             nextlist)
	(while curlist
	  (setq rowcol  (ses-sym-rowcol (car curlist))
		formula (ses-cell-formula (car rowcol) (cdr rowcol)))
	  (or (catch 'ref
		(dolist (ref (ses-formula-references formula))
		  (when (or (memq ref curlist)
			    (memq ref ses--deferred-recalc))
		    ;;This cell refers to another that isn't done yet
		    (add-to-list 'ses--deferred-recalc (car curlist))
		    (throw 'ref t))))
	      ;;ses-update-cells is called from post-command-hook, so
	      ;;inhibit-quit is implicitly bound to t.
	      (when quit-flag
		;;Abort the recalculation.  User will probably undo now.
		(error "Quit"))
	      (ses-calculate-cell (car rowcol) (cdr rowcol) force))
	  (setq curlist (cdr curlist)))
	(dolist (ref ses--deferred-recalc)
	  (add-to-list 'nextlist ref))
	(setq nextlist (sort (copy-sequence nextlist) 'string<))
	(if (equal nextlist prevlist)
	    ;;We'll go around the loop one more time.
	    (add-to-list 'nextlist t)))
      (when ses--deferred-recalc
	;;Just couldn't finish these
	(dolist (x ses--deferred-recalc)
	  (let ((rowcol (ses-sym-rowcol x)))
	    (ses-set-cell (car rowcol) (cdr rowcol) 'value '*error*)
	    (1value (ses-print-cell (car rowcol) (cdr rowcol)))))
	(error "Circular references: %s" ses--deferred-recalc))
      (message " "))
    ;;Can't use save-excursion here: if the cell under point is
    ;;updated, save-excusion's marker will move past the cell.
    (goto-char pos)))


;;----------------------------------------------------------------------------
;; The print area
;;----------------------------------------------------------------------------

(defun ses-in-print-area ()
  "Returns t if point is in print area of spreadsheet."
  (<= (point) ses--data-marker))

;;We turn off point-motion-hooks and explicitly position the cursor, in case
;;the intangible properties have gotten screwed up (e.g., when
;;ses-goto-print is called during a recursive ses-print-cell).
(defun ses-goto-print (row col)
  "Move point to print area for cell (ROW,COL)."
  (let ((inhibit-point-motion-hooks t))
    (goto-char (point-min))
    (forward-line row)
    (dotimes (c col)
      (forward-char (1+ (ses-col-width c))))))

(defun ses-set-curcell ()
  "Sets `ses--curcell' to the current cell symbol, or a cons (BEG,END) for a
region, or nil if cursor is not at a cell."
  (if (or (not mark-active)
	  deactivate-mark
	  (= (region-beginning) (region-end)))
      ;;Single cell
      (setq ses--curcell (get-text-property (point) 'intangible))
    ;;Range
    (let ((bcell (get-text-property (region-beginning) 'intangible))
	  (ecell (get-text-property (1- (region-end))  'intangible)))
      (setq ses--curcell (if (and bcell ecell)
			     (cons bcell ecell)
			   nil))))
  nil)

(defun ses-check-curcell (&rest args)
  "Signal an error if ses--curcell is inappropriate.  The end marker is
appropriate if some argument is 'end.  A range is appropriate if some
argument is 'range.  A single cell is appropriate unless some argument is
'needrange."
  (if (eq ses--curcell t)
      ;;curcell recalculation was postponed, but user typed ahead
      (ses-set-curcell))
  (cond
   ((not ses--curcell)
    (or (memq 'end args)
	(error "Not at cell")))
   ((consp ses--curcell)
    (or (memq 'range args)
	(memq 'needrange args)
	(error "Can't use a range")))
   ((memq 'needrange args)
    (error "Need a range"))))

(defun ses-print-cell (row col)
  "Format and print the value of cell (ROW,COL) to the print area.
Use the cell's printer function.  If the cell's new print form is too wide,
it will spill over into the following cell, but will not run off the end of the
row or overwrite the next non-nil field.  Result is nil for normal operation,
or the error signal if the printer function failed and the cell was formatted
with \"%s\".  If the cell's value is *skip*, nothing is printed because the
preceding cell has spilled over."
  (catch 'ses-print-cell
    (let* ((cell    (ses-get-cell row col))
	   (value   (ses-cell-value cell))
	   (printer (ses-cell-printer cell))
	   (maxcol  (1+ col))
	   text sig startpos x)
      ;;Create the string to print
      (cond
       ((eq value '*skip*)
	;;Don't print anything
	(throw 'ses-print-cell nil))
       ((eq value '*error*)
	(setq text (make-string (ses-col-width col) ?#)))
       (t
	;;Deferred safety-check on printer
	(if (eq (car-safe printer) 'ses-safe-printer)
	    (ses-set-cell row col 'printer
			  (setq printer (ses-safe-printer (cadr printer)))))
	;;Print the value
	(setq text (ses-call-printer (or printer
					 (ses-col-printer col)
					 ses--default-printer)
				     value))
	(if (consp ses-call-printer-return)
	    ;;Printer returned an error
	    (setq sig ses-call-printer-return))))
      ;;Adjust print width to match column width
      (let ((width (ses-col-width col))
	    (len   (length text)))
	(cond
	 ((< len width)
	  ;;Fill field to length with spaces
	  (setq len  (make-string (- width len) ?\s)
		text (if (eq ses-call-printer-return t)
			 (concat text len)
		       (concat len text))))
	 ((> len width)
	  ;;Spill over into following cells, if possible
	  (let ((maxwidth width))
	    (while (and (> len maxwidth)
			(< maxcol ses--numcols)
			(or (not (setq x (ses-cell-value row maxcol)))
			    (eq x '*skip*)))
	      (unless x
		;;Set this cell to '*skip* so it won't overwrite our spillover
		(ses-set-cell row maxcol 'value '*skip*))
	      (setq maxwidth (+ maxwidth (ses-col-width maxcol) 1)
		    maxcol   (1+ maxcol)))
	    (if (<= len maxwidth)
		;;Fill to complete width of all the fields spanned
		(setq text (concat text (make-string (- maxwidth len) ?\s)))
	      ;;Not enough room to end of line or next non-nil field.  Truncate
	      ;;if string or decimal; otherwise fill with error indicator
	      (setq sig `(error "Too wide" ,text))
	      (cond
	       ((stringp value)
		(setq text (substring text 0 maxwidth)))
	       ((and (numberp value)
		     (string-match "\\.[0-9]+" text)
		     (>= 0 (setq width
				 (- len maxwidth
				    (- (match-end 0) (match-beginning 0))))))
		;; Turn 6.6666666666e+49 into 6.66e+49.  Rounding is too hard!
		(setq text (concat (substring text
					      0
					      (- (match-beginning 0) width))
				   (substring text (match-end 0)))))
	       (t
		(setq text (make-string maxwidth ?#)))))))))
      ;;Substitute question marks for tabs and newlines.  Newlines are
      ;;used as row-separators; tabs could confuse the reimport logic.
      (setq text (replace-regexp-in-string "[\t\n]" "?" text))
      (ses-goto-print row col)
      (setq startpos (point))
      ;;Install the printed result.  This is not interruptible.
      (let ((inhibit-read-only t)
	    (inhibit-quit      t))
	(delete-char (1+ (length text)))
	;;We use concat instead of inserting separate strings in order to
	;;reduce the number of cells in the undo list.
	(setq x (concat text (if (< maxcol ses--numcols) " " "\n")))
	;;We use set-text-properties to prevent a wacky print function
	;;from inserting rogue properties, and to ensure that the keymap
	;;property is inherited (is it a bug that only unpropertied strings
	;;actually inherit from surrounding text?)
	(set-text-properties 0 (length x) nil x)
	(insert-and-inherit x)
	(put-text-property startpos (point) 'intangible
			   (ses-cell-symbol cell))
	(when (and (zerop row) (zerop col))
	  ;;Reconstruct special beginning-of-buffer attributes
	  (put-text-property (point-min) (point) 'keymap 'ses-mode-print-map)
	  (put-text-property (point-min) (point) 'read-only 'ses)
	  (put-text-property (point-min) (1+ (point-min)) 'front-sticky t)))
      (if (= row (1- ses--header-row))
	  ;;This line is part of the header - force recalc
	  (ses-reset-header-string))
      ;;If this cell (or a preceding one on the line) previously spilled over
      ;;and has gotten shorter, redraw following cells on line recursively.
      (when (and (< maxcol ses--numcols)
		 (eq (ses-cell-value row maxcol) '*skip*))
	(ses-set-cell row maxcol 'value nil)
	(ses-print-cell row maxcol))
      ;;Return to start of cell
      (goto-char startpos)
      sig)))

(defun ses-call-printer (printer &optional value)
  "Invokes PRINTER (a string or parenthesized string or function-symbol or
lambda of one argument) on VALUE.  Result is the the printed cell as a
string.  The variable `ses-call-printer-return' is set to t if the printer
used parenthesis to request left-justification, or the error-signal if the
printer signaled one (and \"%s\" is used as the default printer), else nil."
  (setq ses-call-printer-return nil)
  (unless value
    (setq value ""))
  (condition-case signal
      (cond
       ((stringp printer)
	(format printer value))
       ((stringp (car-safe printer))
	(setq ses-call-printer-return t)
	(format (car printer) value))
       (t
	(setq value (funcall printer value))
	(if (stringp value)
	    value
	  (or (stringp (car-safe value))
	      (error "Printer should return \"string\" or (\"string\")"))
	  (setq ses-call-printer-return t)
	  (car value))))
    (error
     (setq ses-call-printer-return signal)
     (prin1-to-string value t))))

(defun ses-adjust-print-width (col change)
  "Insert CHANGE spaces in front of column COL, or at end of line if
COL=NUMCOLS.  Deletes characters if CHANGE < 0.  Caller should bind
inhibit-quit to t."
  (let ((inhibit-read-only t)
	(blank  (if (> change 0) (make-string change ?\s)))
	(at-end (= col ses--numcols)))
    (ses-set-with-undo 'ses--linewidth (+ ses--linewidth change))
    ;;ses-set-with-undo always returns t for strings.
    (1value (ses-set-with-undo 'ses--blank-line
			       (concat (make-string ses--linewidth ?\s) "\n")))
    (dotimes (row ses--numrows)
      (ses-goto-print row col)
      (when at-end
	;;Insert new columns before newline
	(let ((inhibit-point-motion-hooks t))
	  (backward-char 1)))
      (if blank
	  (insert blank)
	(delete-char (- change))))))

(defun ses-print-cell-new-width (row col)
  "Same as ses-print-cell, except if the cell's value is *skip*, the preceding
nonskipped cell is reprinted.  This function is used when the width of
cell (ROW,COL) has changed."
  (if (not (eq (ses-cell-value row col) '*skip*))
      (ses-print-cell row col)
    ;;Cell was skipped over - reprint previous
    (ses-goto-print row col)
    (backward-char 1)
    (let ((rowcol (ses-sym-rowcol (get-text-property (point) 'intangible))))
      (ses-print-cell (car rowcol) (cdr rowcol)))))


;;----------------------------------------------------------------------------
;; The data area
;;----------------------------------------------------------------------------

(defun ses-narrowed-p () (/= (- (point-max) (point-min)) (buffer-size)))

(defun ses-widen ()
  "Turn off narrowing, to be reenabled at end of command loop."
  (if (ses-narrowed-p)
      (setq ses--deferred-narrow t))
  (widen))

(defun ses-goto-data (def &optional col)
  "Move point to data area for (DEF,COL).  If DEF is a row
number, COL is the column number for a data cell -- otherwise DEF
is one of the symbols ses--col-widths, ses--col-printers,
ses--default-printer, ses--numrows, or ses--numcols."
  (ses-widen)
  (let ((inhibit-point-motion-hooks t)) ;In case intangible attrs are wrong
    (if col
	;;It's a cell
	(progn
	  (goto-char ses--data-marker)
	  (forward-line (+ 1 (* def (1+ ses--numcols)) col)))
      ;;Convert def-symbol to offset
      (setq def (plist-get ses-paramlines-plist def))
      (or def (signal 'args-out-of-range nil))
      (goto-char ses--params-marker)
      (forward-line def))))

(defun ses-set-parameter (def value &optional elem)
  "Set parameter DEF to VALUE (with undo) and write the value to the data area.
See `ses-goto-data' for meaning of DEF.  Newlines in the data are escaped.
If ELEM is specified, it is the array subscript within DEF to be set to VALUE."
  (save-excursion
    ;;We call ses-goto-data early, using the old values of numrows and
    ;;numcols in case one of them is being changed.
    (ses-goto-data def)
    (let ((inhibit-read-only t)
	  (fmt (plist-get '(ses--col-widths      "(ses-column-widths %S)"
			    ses--col-printers    "(ses-column-printers %S)"
			    ses--default-printer "(ses-default-printer %S)"
			    ses--header-row      "(ses-header-row %S)"
			    ses--file-format     " %S ;SES file-format"
			    ses--numrows         " %S ;numrows"
			    ses--numcols         " %S ;numcols")
			  def))
	  oldval)
      (if elem
	  (progn
	    (setq oldval (aref (symbol-value def) elem))
	    (aset (symbol-value def) elem value))
	(setq oldval (symbol-value def))
	(set def value))
      ;;Special undo since it's outside the narrowed buffer
      (let (buffer-undo-list)
	(delete-region (point) (line-end-position))
	(insert (format fmt (symbol-value def))))
      (push `(apply ses-set-parameter ,def ,oldval ,elem) buffer-undo-list))))


(defun ses-write-cells ()
  "Write cells in `ses--deferred-write' from local variables to data area.
Newlines in the data are escaped."
  (let* ((inhibit-read-only t)
	 (print-escape-newlines t)
	 rowcol row col cell sym formula printer text)
    (setq ses-start-time (float-time))
    (with-temp-message " "
      (save-excursion
	(while ses--deferred-write
	  (ses-time-check "Writing... (%d cells left)"
			  '(length ses--deferred-write))
	  (setq rowcol  (pop ses--deferred-write)
		row     (car rowcol)
		col     (cdr rowcol)
		cell    (ses-get-cell row col)
		sym     (ses-cell-symbol cell)
		formula (ses-cell-formula cell)
		printer (ses-cell-printer cell))
	  (if (eq (car-safe formula) 'ses-safe-formula)
	      (setq formula (cadr formula)))
	  (if (eq (car-safe printer) 'ses-safe-printer)
	      (setq printer (cadr printer)))
	  ;;This is noticably faster than (format "%S %S %S %S %S")
	  (setq text    (concat "(ses-cell "
				(symbol-name sym)
				" "
				(prin1-to-string (symbol-value sym))
				" "
				(prin1-to-string formula)
				" "
				(prin1-to-string printer)
				" "
				(if (atom (ses-cell-references cell))
				    "nil"
				  (concat "("
					  (mapconcat 'symbol-name
						     (ses-cell-references cell)
						     " ")
					  ")"))
				")"))
	  (ses-goto-data row col)
	  (delete-region (point) (line-end-position))
	  (insert text)))
      (message " "))))


;;----------------------------------------------------------------------------
;; Formula relocation
;;----------------------------------------------------------------------------

(defun ses-formula-references (formula &optional result-so-far)
  "Produce a list of symbols for cells that this formula's value
refers to.  For recursive calls, RESULT-SO-FAR is the list being constructed,
or t to get a wrong-type-argument error when the first reference is found."
  (if (atom formula)
      (if (ses-sym-rowcol formula)
	  ;;Entire formula is one symbol
	  (add-to-list 'result-so-far formula)
	) ;;Ignore other atoms
    (dolist (cur formula)
      (cond
       ((ses-sym-rowcol cur)
	;;Save this reference
	(add-to-list 'result-so-far cur))
       ((eq (car-safe cur) 'ses-range)
	;;All symbols in range are referenced
	(dolist (x (cdr (macroexpand cur)))
	  (add-to-list 'result-so-far x)))
       ((and (consp cur) (not (eq (car cur) 'quote)))
	;;Recursive call for subformulas
	(setq result-so-far (ses-formula-references cur result-so-far)))
       (t
	;;Ignore other stuff
	))))
  result-so-far)

(defsubst ses-relocate-symbol (sym rowcol startrow startcol rowincr colincr)
  "Relocate one symbol SYM, whichs corresponds to ROWCOL (a cons of ROW and
COL).  Cells starting at (STARTROW,STARTCOL) are being shifted
by (ROWINCR,COLINCR)."
  (let ((row (car rowcol))
	(col (cdr rowcol)))
    (if (or (< row startrow) (< col startcol))
	sym
      (setq row (+ row rowincr)
	    col (+ col colincr))
      (if (and (>= row startrow) (>= col startcol)
	       (< row ses--numrows) (< col ses--numcols))
	  ;;Relocate this variable
	  (ses-create-cell-symbol row col)
	;;Delete reference to a deleted cell
	nil))))

(defun ses-relocate-formula (formula startrow startcol rowincr colincr)
  "Produce a copy of FORMULA where all symbols that refer to cells in row
STARTROW or above and col STARTCOL or above are altered by adding ROWINCR
and COLINCR.  STARTROW and STARTCOL are 0-based. Example:
	(ses-relocate-formula '(+ A1 B2 D3) 1 2 1 -1)
	=> (+ A1 B2 C4)
If ROWINCR or COLINCR is negative, references to cells being deleted are
removed.  Example:
	(ses-relocate-formula '(+ A1 B2 D3) 0 1 0 -1)
	=> (+ A1 C3)
Sets `ses-relocate-return' to 'delete if cell-references were removed."
  (let (rowcol result)
    (if (or (atom formula) (eq (car formula) 'quote))
	(if (setq rowcol (ses-sym-rowcol formula))
	    (ses-relocate-symbol formula rowcol
				 startrow startcol rowincr colincr)
	  formula) ;Pass through as-is
      (dolist (cur formula)
	(setq rowcol (ses-sym-rowcol cur))
	(cond
	 (rowcol
	  (setq cur (ses-relocate-symbol cur rowcol
					 startrow startcol rowincr colincr))
	  (if cur
	      (push cur result)
	    ;;Reference to a deleted cell.  Set a flag in ses-relocate-return.
	    ;;don't change the flag if it's already 'range, since range
	    ;;implies 'delete.
	    (unless ses-relocate-return
	      (setq ses-relocate-return 'delete))))
	 ((eq (car-safe cur) 'ses-range)
	  (setq cur (ses-relocate-range cur startrow startcol rowincr colincr))
	  (if cur
	      (push cur result)))
	 ((or (atom cur) (eq (car cur) 'quote))
	  ;;Constants pass through unchanged
	  (push cur result))
	 (t
	  ;;Recursively copy and alter subformulas
	  (push (ses-relocate-formula cur startrow startcol
						   rowincr colincr)
		result))))
      (nreverse result))))

(defun ses-relocate-range (range startrow startcol rowincr colincr)
  "Relocate one RANGE, of the form '(ses-range min max).  Cells starting
at (STARTROW,STARTCOL) are being shifted by (ROWINCR,COLINCR).  Result is the
new range, or nil if the entire range is deleted.  If new rows are being added
just beyond the end of a row range, or new columns just beyond a column range,
the new rows/columns will be added to the range.  Sets `ses-relocate-return'
if the range was altered."
  (let* ((minorig   (cadr range))
	 (minrowcol (ses-sym-rowcol minorig))
	 (min       (ses-relocate-symbol minorig minrowcol
					 startrow startcol
					 rowincr colincr))
	 (maxorig   (nth 2 range))
	 (maxrowcol (ses-sym-rowcol maxorig))
	 (max       (ses-relocate-symbol maxorig maxrowcol
					 startrow startcol
					 rowincr colincr))
	 field)
    (cond
     ((and (not min) (not max))
      (setq range nil)) ;;The entire range is deleted
     ((zerop colincr)
      ;;Inserting or deleting rows
      (setq field 'car)
      (if (not min)
	  ;;Chopped off beginning of range
	  (setq min           (ses-create-cell-symbol startrow (cdr minrowcol))
		ses-relocate-return 'range))
      (if (not max)
	  (if (> rowincr 0)
	      ;;Trying to insert a nonexistent row
	      (setq max (ses-create-cell-symbol (1- ses--numrows)
						(cdr minrowcol)))
	    ;;End of range is being deleted
	    (setq max (ses-create-cell-symbol (1- startrow) (cdr minrowcol))
		  ses-relocate-return 'range))
	(and (> rowincr 0)
	     (= (car maxrowcol) (1- startrow))
	     (= (cdr minrowcol) (cdr maxrowcol))
	     ;;Insert after ending row of vertical range - include it
	     (setq max (ses-create-cell-symbol (+ startrow rowincr -1)
					       (cdr maxrowcol))))))
     (t
      ;;Inserting or deleting columns
      (setq field 'cdr)
      (if (not min)
	  ;;Chopped off beginning of range
	  (setq min          (ses-create-cell-symbol (car minrowcol) startcol)
		ses-relocate-return 'range))
      (if (not max)
	  (if (> colincr 0)
	      ;;Trying to insert a nonexistent column
	      (setq max (ses-create-cell-symbol (car maxrowcol)
						(1- ses--numcols)))
	    ;;End of range is being deleted
	    (setq max (ses-create-cell-symbol (car maxrowcol) (1- startcol))
		  ses-relocate-return 'range))
	(and (> colincr 0)
	     (= (cdr maxrowcol) (1- startcol))
	     (= (car minrowcol) (car maxrowcol))
	     ;;Insert after ending column of horizontal range - include it
	     (setq max (ses-create-cell-symbol (car maxrowcol)
						  (+ startcol colincr -1)))))))
    (when range
      (if (/= (- (funcall field maxrowcol)
		 (funcall field minrowcol))
	      (- (funcall field (ses-sym-rowcol max))
		 (funcall field (ses-sym-rowcol min))))
	  ;;This range has changed size
	  (setq ses-relocate-return 'range))
      (list 'ses-range min max))))

(defun ses-relocate-all (minrow mincol rowincr colincr)
  "Alter all cell values, symbols, formulas, and reference-lists to relocate
the rectangle (MINROW,MINCOL)..(NUMROWS,NUMCOLS) by adding ROWINCR and COLINCR
to each symbol."
  (let (reform)
    (let (mycell newval)
      (dotimes-with-progress-reporter
          (row ses--numrows) "Relocating formulas..."
	(dotimes (col ses--numcols)
	  (setq ses-relocate-return nil
		mycell (ses-get-cell row col)
		newval (ses-relocate-formula (ses-cell-formula mycell)
					     minrow mincol rowincr colincr))
	  (ses-set-cell row col 'formula newval)
	  (if (eq ses-relocate-return 'range)
	      ;;This cell contains a (ses-range X Y) where a cell has been
	      ;;inserted or deleted in the middle of the range.
	      (push (cons row col) reform))
	  (if ses-relocate-return
	      ;;This cell referred to a cell that's been deleted or is no
	      ;;longer part of the range.  We can't fix that now because
	      ;;reference lists cells have been partially updated.
	      (add-to-list 'ses--deferred-recalc
			   (ses-create-cell-symbol row col)))
	  (setq newval (ses-relocate-formula (ses-cell-references mycell)
					     minrow mincol rowincr colincr))
	  (ses-set-cell row col 'references newval)
	  (and (>= row minrow) (>= col mincol)
	       (ses-set-cell row col 'symbol
			     (ses-create-cell-symbol row col))))))
    ;;Relocate the cell values
    (let (oldval myrow mycol xrow xcol)
      (cond
       ((and (<= rowincr 0) (<= colincr 0))
	;;Deletion of rows and/or columns
	(dotimes-with-progress-reporter
           (row (- ses--numrows minrow)) "Relocating variables..."
	  (setq myrow  (+ row minrow))
	  (dotimes (col (- ses--numcols mincol))
	    (setq mycol  (+ col mincol)
		  xrow   (- myrow rowincr)
		  xcol   (- mycol colincr))
	    (if (and (< xrow ses--numrows) (< xcol ses--numcols))
		(setq oldval (ses-cell-value xrow xcol))
	      ;;Cell is off the end of the array
	      (setq oldval (symbol-value (ses-create-cell-symbol xrow xcol))))
	    (ses-set-cell myrow mycol 'value oldval))))
       ((and (wholenump rowincr) (wholenump colincr))
	;;Insertion of rows and/or columns.  Run the loop backwards.
	(let ((disty (1- ses--numrows))
	      (distx (1- ses--numcols))
	      myrow mycol)
	  (dotimes-with-progress-reporter
	      (row (- ses--numrows minrow)) "Relocating variables..."
	    (setq myrow (- disty row))
	    (dotimes (col (- ses--numcols mincol))
	      (setq mycol (- distx col)
		    xrow  (- myrow rowincr)
		    xcol  (- mycol colincr))
	      (if (or (< xrow minrow) (< xcol mincol))
		  ;;Newly-inserted value
		  (setq oldval nil)
		;;Transfer old value
		(setq oldval (ses-cell-value xrow xcol)))
	      (ses-set-cell myrow mycol 'value oldval)))
	  t))  ;Make testcover happy by returning non-nil here
       (t
	(error "ROWINCR and COLINCR must have the same sign"))))
    ;;Reconstruct reference lists for cells that contain ses-ranges that
    ;;have changed size.
    (when reform
      (message "Fixing ses-ranges...")
      (let (row col)
	(setq ses-start-time (float-time))
	(while reform
	  (ses-time-check "Fixing ses-ranges... (%d left)" '(length reform))
	  (setq row    (caar reform)
		col    (cdar reform)
		reform (cdr reform))
	  (ses-cell-set-formula row col (ses-cell-formula row col))))
      (message nil))))


;;----------------------------------------------------------------------------
;; Undo control
;;----------------------------------------------------------------------------

(defun ses-begin-change ()
  "For undo, remember point before we start changing hidden stuff."
  (let ((inhibit-read-only t))
    (insert-and-inherit "X")
    (delete-region (1- (point)) (point))))

(defun ses-set-with-undo (sym newval)
  "Like set, but undoable.  Result is t if value has changed."
  ;;We try to avoid adding redundant entries to the undo list, but this is
  ;;unavoidable for strings because equal ignores text properties and there's
  ;;no easy way to get the whole property list to see if it's different!
  (unless (and (boundp sym)
	       (equal (symbol-value sym) newval)
	       (not (stringp newval)))
    (push (if (boundp sym)
	      `(apply ses-set-with-undo ,sym ,(symbol-value sym))
	    `(apply ses-unset-with-undo ,sym))
	  buffer-undo-list)
    (set sym newval)
    t))

(defun ses-unset-with-undo (sym)
  "Set SYM to be unbound.  This is undoable."
  (when (1value (boundp sym)) ;;Always bound, except after a programming error
    (push `(apply ses-set-with-undo ,sym ,(symbol-value sym)) buffer-undo-list)
    (makunbound sym)))

(defun ses-aset-with-undo (array idx newval)
  "Like aset, but undoable.  Result is t if element has changed"
  (unless (equal (aref array idx) newval)
    (push `(apply ses-aset-with-undo ,array ,idx ,(aref array idx)) buffer-undo-list)
    (aset array idx newval)
    t))


;;----------------------------------------------------------------------------
;; Startup for major mode
;;----------------------------------------------------------------------------

(defun ses-load ()
  "Parse the current buffer and sets up buffer-local variables.  Does not
execute cell formulas or print functions."
  (widen)
  ;;Read our global parameters, which should be a 3-element list
  (goto-char (point-max))
  (search-backward ";; Local Variables:\n" nil t)
  (backward-list 1)
  (setq ses--params-marker (point-marker))
  (let ((params (condition-case nil (read (current-buffer)) (error nil))))
    (or (and (= (safe-length params) 3)
	     (numberp (car params))
	     (numberp (cadr params))
	     (>= (cadr params) 0)
	     (numberp (nth 2 params))
	     (> (nth 2 params) 0))
	(error "Invalid SES file"))
    (setq ses--file-format (car params)
	  ses--numrows     (cadr params)
	  ses--numcols     (nth 2 params))
    (when (= ses--file-format 1)
      (let (buffer-undo-list) ;This is not undoable
	(ses-goto-data 'ses--header-row)
	(insert "(ses-header-row 0)\n")
	(ses-set-parameter 'ses--file-format 2)
	(message "Upgrading from SES-1 file format")))
    (or (= ses--file-format 2)
	(error "This file needs a newer version of the SES library code"))
    (ses-create-cell-variable-range 0 (1- ses--numrows) 0 (1- ses--numcols))
    ;;Initialize cell array
    (setq ses--cells (make-vector ses--numrows nil))
    (dotimes (row ses--numrows)
      (aset ses--cells row (make-vector ses--numcols nil))))
  ;;Skip over print area, which we assume is correct
  (goto-char (point-min))
  (forward-line ses--numrows)
  (or (looking-at ses-print-data-boundary)
      (error "Missing marker between print and data areas"))
  (forward-char 1)
  (setq ses--data-marker (point-marker))
  (forward-char (1- (length ses-print-data-boundary)))
  ;;Initialize printer and symbol lists
  (mapc 'ses-printer-record ses-standard-printer-functions)
  (setq ses--symbolic-formulas nil)
  ;;Load cell definitions
  (dotimes (row ses--numrows)
    (dotimes (col ses--numcols)
      (let* ((x      (read (current-buffer)))
	     (rowcol (ses-sym-rowcol (car-safe (cdr-safe x)))))
	(or (and (looking-at "\n")
		 (eq (car-safe x) 'ses-cell)
		 (eq row (car rowcol))
		 (eq col (cdr rowcol)))
	    (error "Cell-def error"))
	(eval x)))
    (or (looking-at "\n\n")
	(error "Missing blank line between rows")))
  ;;Load global parameters
  (let ((widths      (read (current-buffer)))
	(n1          (char-after (point)))
	(printers    (read (current-buffer)))
	(n2          (char-after (point)))
	(def-printer (read (current-buffer)))
	(n3          (char-after (point)))
	(head-row    (read (current-buffer)))
	(n4          (char-after (point))))
    (or (and (eq (car-safe widths) 'ses-column-widths)
	     (= n1 ?\n)
	     (eq (car-safe printers) 'ses-column-printers)
	     (= n2 ?\n)
	     (eq (car-safe def-printer) 'ses-default-printer)
	     (= n3 ?\n)
	     (eq (car-safe head-row) 'ses-header-row)
	     (= n4 ?\n))
	(error "Invalid SES global parameters"))
    (1value (eval widths))
    (1value (eval def-printer))
    (1value (eval printers))
    (1value (eval head-row)))
  ;;Should be back at global-params
  (forward-char 1)
  (or (looking-at (replace-regexp-in-string "1" "[0-9]+"
					    ses-initial-global-parameters))
      (error "Problem with column-defs or global-params"))
  ;;Check for overall newline count in definitions area
  (forward-line 3)
  (let ((start (point)))
    (ses-goto-data 'ses--numrows)
    (or (= (point) start)
	(error "Extraneous newlines someplace?"))))

(defun ses-setup ()
  "Set up for display of only the printed cell values.

Narrows the buffer to show only the print area.  Gives it `read-only' and
`intangible' properties.  Sets up highlighting for current cell."
  (interactive)
  (let ((end (point-min))
	(inhibit-read-only t)
	(was-modified (buffer-modified-p))
	pos sym)
    (ses-goto-data 0 0) ;;Include marker between print-area and data-area
    (set-text-properties (point) (point-max) nil) ;Delete garbage props
    (mapc 'delete-overlay (overlays-in (point-min) (point-max)))
    ;;The print area is read-only (except for our special commands) and uses a
    ;;special keymap.
    (put-text-property (point-min) (1- (point)) 'read-only 'ses)
    (put-text-property (point-min) (1- (point)) 'keymap 'ses-mode-print-map)
    ;;For the beginning of the buffer, we want the read-only and keymap
    ;;attributes to be  inherited from the first character
    (put-text-property (point-min) (1+ (point-min)) 'front-sticky t)
    ;;Create intangible properties, which also indicate which cell the text
    ;;came from.
    (dotimes-with-progress-reporter (row ses--numrows) "Finding cells..."
      (dotimes (col ses--numcols)
	(setq pos  end
	      sym  (ses-cell-symbol row col))
	;;Include skipped cells following this one
	(while (and (< col (1- ses--numcols))
		    (eq (ses-cell-value row (1+ col)) '*skip*))
	  (setq end (+ end (ses-col-width col) 1)
		col (1+ col)))
	(setq end (+ end (ses-col-width col) 1))
	(put-text-property pos end 'intangible sym)))
    ;;Adding these properties did not actually alter the text
    (unless was-modified
      (restore-buffer-modified-p nil)
      (buffer-disable-undo)
      (buffer-enable-undo)))
  ;;Create the underlining overlay.  It's impossible for (point) to be 2,
  ;;because column A must be at least 1 column wide.
  (setq ses--curcell-overlay (make-overlay (1+ (point-min)) (1+ (point-min))))
  (overlay-put ses--curcell-overlay 'face 'underline))

(defun ses-cleanup ()
  "Cleanup when changing a buffer from SES mode to something else.  Delete
overlay, remove special text properties."
  (widen)
  (let ((inhibit-read-only t)
	(was-modified      (buffer-modified-p)))
    ;;Delete read-only, keymap, and intangible properties
    (set-text-properties (point-min) (point-max) nil)
    ;;Delete overlay
    (mapc 'delete-overlay (overlays-in (point-min) (point-max)))
    (unless was-modified
      (set-buffer-modified-p nil))))

;;;###autoload
(defun ses-mode ()
  "Major mode for Simple Emacs Spreadsheet.
See \"ses-example.ses\" (in the etc data directory) for more info.

Key definitions:
\\{ses-mode-map}
These key definitions are active only in the print area (the visible part):
\\{ses-mode-print-map}
These are active only in the minibuffer, when entering or editing a formula:
\\{ses-mode-edit-map}"
  (interactive)
  (unless (and (boundp 'ses--deferred-narrow)
	       (eq ses--deferred-narrow 'ses-mode))
    (kill-all-local-variables)
    (mapc 'make-local-variable ses-localvars)
    (setq major-mode             'ses-mode
	  mode-name              "SES"
	  next-line-add-newlines nil
	  truncate-lines         t
	  ;;SES deliberately puts lots of trailing whitespace in its buffer
	  show-trailing-whitespace nil
	  ;;Cell ranges do not work reasonably without this
	  transient-mark-mode    t)
    (1value (add-hook 'change-major-mode-hook 'ses-cleanup nil t))
    (1value (add-hook 'before-revert-hook 'ses-cleanup nil t))
    (setq ses--curcell         nil
	  ses--deferred-recalc nil
	  ses--deferred-write  nil
	  ses--header-hscroll  -1  ;Flag for "initial recalc needed"
	  header-line-format   '(:eval (progn
					 (when (/= (window-hscroll)
						   ses--header-hscroll)
					   ;;Reset ses--header-hscroll first, to
					   ;;avoid recursion problems when
					   ;;debugging ses-create-header-string
					   (setq ses--header-hscroll
						 (window-hscroll))
					   (ses-create-header-string))
					 ses--header-string)))
    (let ((was-empty    (zerop (buffer-size)))
	  (was-modified (buffer-modified-p)))
      (save-excursion
	(if was-empty
	    ;;Initialize buffer to contain one cell, for now
	    (insert ses-initial-file-contents))
	(ses-load)
	(ses-setup))
      (when was-empty
	(unless (equal ses-initial-default-printer (1value ses--default-printer))
	  (1value (ses-read-default-printer ses-initial-default-printer)))
	(unless (= ses-initial-column-width (1value (ses-col-width 0)))
	  (1value (ses-set-column-width 0 ses-initial-column-width)))
	(ses-set-curcell)
	(if (> (car ses-initial-size) (1value ses--numrows))
	    (1value (ses-insert-row (1- (car ses-initial-size)))))
	(if (> (cdr ses-initial-size) (1value ses--numcols))
	    (1value (ses-insert-column (1- (cdr ses-initial-size)))))
	(ses-write-cells)
	(restore-buffer-modified-p was-modified)
	(buffer-disable-undo)
	(buffer-enable-undo)
	(goto-char (point-min))))
    (use-local-map ses-mode-map)
    ;;Set the deferred narrowing flag (we can't narrow until after
    ;;after-find-file completes).  If .ses is on the auto-load alist and the
    ;;file has "mode: ses", our ses-mode function will be called twice!  Use
    ;;a special flag to detect this (will be reset by ses-command-hook).
    ;;For find-alternate-file, post-command-hook doesn't get run for some
    ;;reason, so use an idle timer to make sure.
    (setq ses--deferred-narrow 'ses-mode)
    (1value (add-hook 'post-command-hook 'ses-command-hook nil t))
    (run-with-idle-timer 0.01 nil 'ses-command-hook)
    (run-mode-hooks 'ses-mode-hook)))

(put 'ses-mode 'mode-class 'special)

(defun ses-command-hook ()
  "Invoked from `post-command-hook'.  If point has moved to a different cell,
moves the underlining overlay.  Performs any recalculations or cell-data
writes that have been deferred.  If buffer-narrowing has been deferred,
narrows the buffer now."
  (condition-case err
      (when (eq major-mode 'ses-mode)  ;Otherwise, not our buffer anymore
	(when ses--deferred-recalc
	  ;;We reset the deferred list before starting on the recalc -- in case
	  ;;of error, we don't want to retry the recalc after every keystroke!
	  (let ((old ses--deferred-recalc))
	    (setq ses--deferred-recalc nil)
	    (ses-update-cells old)))
	(when ses--deferred-write
	  ;;We don't reset the deferred list before starting -- the most
	  ;;likely error is keyboard-quit, and we do want to keep trying
	  ;;these writes after a quit.
	  (ses-write-cells)
	  (push '(apply ses-widen) buffer-undo-list))
	(when ses--deferred-narrow
	  ;;We're not allowed to narrow the buffer until after-find-file has
	  ;;read the local variables at the end of the file.  Now it's safe to
	  ;;do the narrowing.
	  (narrow-to-region (point-min) ses--data-marker)
	  (setq ses--deferred-narrow nil))
	;;Update the modeline
	(let ((oldcell ses--curcell))
	  (ses-set-curcell)
	  (unless (eq ses--curcell oldcell)
	    (cond
	     ((not ses--curcell)
	      (setq mode-line-process nil))
	     ((atom ses--curcell)
	      (setq mode-line-process (list " cell "
					    (symbol-name ses--curcell))))
	     (t
	      (setq mode-line-process (list " range "
					    (symbol-name (car ses--curcell))
					    "-"
					    (symbol-name (cdr ses--curcell))))))
	    (force-mode-line-update)))
	;;Use underline overlay for single-cells only, turn off otherwise
	(if (listp ses--curcell)
	    (move-overlay ses--curcell-overlay 2 2)
	  (let ((next (next-single-property-change (point) 'intangible)))
	    (move-overlay ses--curcell-overlay (point) (1- next))))
	(when (not (pos-visible-in-window-p))
	  ;;Scrolling will happen later
	  (run-with-idle-timer 0.01 nil 'ses-command-hook)
	  (setq ses--curcell t)))
    ;;Prevent errors in this post-command-hook from silently erasing the hook!
    (error
     (unless executing-kbd-macro
       (ding))
     (message "%s" (error-message-string err))))
  nil) ;Make coverage-tester happy

(defun ses-create-header-string ()
  "Set up `ses--header-string' as the buffer's header line.
Based on the current set of columns and `window-hscroll' position."
  (let ((totwidth (- (window-hscroll)))
	result width x)
    ;;Leave room for the left-side fringe and scrollbar
    (push (propertize " " 'display '((space :align-to 0))) result)
    (dotimes (col ses--numcols)
      (setq width    (ses-col-width col)
	    totwidth (+ totwidth width 1))
      (if (= totwidth 1)
	  ;;Scrolled so intercolumn space is leftmost
	  (push " " result))
      (when (> totwidth 1)
	(if (> ses--header-row 0)
	    (save-excursion
	      (ses-goto-print (1- ses--header-row) col)
	      (setq x (buffer-substring-no-properties (point)
						      (+ (point) width)))
	      ;; Strip trailing space.
	      (if (string-match "[ \t]+\\'" x)
		  (setq x (substring x 0 (match-beginning 0))))
	      ;; Cut off excess text.
	      (if (>= (length x) totwidth)
		  (setq x (substring x 0 (- totwidth -1)))))
	  (setq x (ses-column-letter col)))
	  (push (propertize x 'face ses-box-prop) result)
	(push (propertize "."
			    'display    `((space :align-to ,(1- totwidth)))
			    'face       ses-box-prop)
	      result)
	;;Allow the following space to be squished to make room for the 3-D box
	;;Coverage test ignores properties, thinks this is always a space!
	(push (1value (propertize " " 'display `((space :align-to ,totwidth))))
	      result)))
    (if (> ses--header-row 0)
	(push (propertize (format "  [row %d]" ses--header-row)
			  'display '((height (- 1))))
	      result))
    (setq ses--header-string (apply 'concat (nreverse result)))))


;;----------------------------------------------------------------------------
;; Redisplay and recalculation
;;----------------------------------------------------------------------------

(defun ses-jump (sym)
  "Move point to cell SYM."
  (interactive "SJump to cell: ")
  (let ((rowcol (ses-sym-rowcol sym)))
    (or rowcol (error "Invalid cell name"))
    (if (eq (symbol-value sym) '*skip*)
	(error "Cell is covered by preceding cell"))
    (ses-goto-print (car rowcol) (cdr rowcol))))

(defun ses-jump-safe (cell)
  "Like `ses-jump', but no error if invalid cell."
  (condition-case nil
      (ses-jump cell)
    (error)))

(defun ses-reprint-all (&optional nonarrow)
  "Recreate the display area.  Calls all printer functions.  Narrows to
print area if NONARROW is nil."
  (interactive "*P")
  (widen)
  (unless nonarrow
    (setq ses--deferred-narrow t))
  (let ((startcell (get-text-property (point) 'intangible))
	(inhibit-read-only t))
    (ses-begin-change)
    (goto-char (point-min))
    (search-forward ses-print-data-boundary)
    (backward-char (length ses-print-data-boundary))
    (delete-region (point-min) (point))
    ;;Insert all blank lines before printing anything, so ses-print-cell can
    ;;find the data area when inserting or deleting *skip* values for cells
    (dotimes (row ses--numrows)
      (insert-and-inherit ses--blank-line))
    (dotimes-with-progress-reporter (row ses--numrows) "Reprinting..."
      (if (eq (ses-cell-value row 0) '*skip*)
	  ;;Column deletion left a dangling skip
	  (ses-set-cell row 0 'value nil))
      (dotimes (col ses--numcols)
	(ses-print-cell row col))
      (beginning-of-line 2))
    (ses-jump-safe startcell)))

(defun ses-recalculate-cell ()
  "Recalculate and reprint the current cell or range.

For an individual cell, shows the error if the formula or printer
signals one, or otherwise shows the cell's complete value.  For a range, the
cells are recalculated in \"natural\" order, so cells that other cells refer
to are recalculated first."
  (interactive "*")
  (ses-check-curcell 'range)
  (ses-begin-change)
  (let (sig)
    (setq ses-start-time (float-time))
    (if (atom ses--curcell)
	(setq sig (ses-sym-rowcol ses--curcell)
	      sig (ses-calculate-cell (car sig) (cdr sig) t))
      ;;First, recalculate all cells that don't refer to other cells and
      ;;produce a list of cells with references.
      (ses-dorange ses--curcell
	(ses-time-check "Recalculating... %s" '(ses-cell-symbol row col))
	(condition-case nil
	    (progn
	      ;;The t causes an error if the cell has references.
	      ;;If no references, the t will be the result value.
	      (1value (ses-formula-references (ses-cell-formula row col) t))
	      (setq sig (ses-calculate-cell row col t)))
	  (wrong-type-argument
	   ;;The formula contains a reference
	   (add-to-list 'ses--deferred-recalc (ses-cell-symbol row col))))))
    ;;Do the update now, so we can force recalculation
    (let ((x ses--deferred-recalc))
      (setq ses--deferred-recalc nil)
      (condition-case hold
	  (ses-update-cells x t)
	(error (setq sig hold))))
    (cond
     (sig
      (message "%s" (error-message-string sig)))
     ((consp ses--curcell)
      (message " "))
     (t
      (princ (symbol-value ses--curcell))))))

(defun ses-recalculate-all ()
  "Recalculate and reprint all cells."
  (interactive "*")
  (let ((startcell    (get-text-property (point) 'intangible))
	(ses--curcell (cons 'A1 (ses-cell-symbol (1- ses--numrows)
						 (1- ses--numcols)))))
    (ses-recalculate-cell)
    (ses-jump-safe startcell)))

(defun ses-truncate-cell ()
  "Reprint current cell, but without spillover into any following blank
cells."
  (interactive "*")
  (ses-check-curcell)
  (let* ((rowcol (ses-sym-rowcol ses--curcell))
	 (row    (car rowcol))
	 (col    (cdr rowcol)))
    (when (and (< col (1- ses--numcols)) ;;Last column can't spill over, anyway
	       (eq (ses-cell-value row (1+ col)) '*skip*))
      ;;This cell has spill-over.  We'll momentarily pretend the following
      ;;cell has a `t' in it.
      (eval `(let ((,(ses-cell-symbol row (1+ col)) t))
	       (ses-print-cell row col)))
      ;;Now remove the *skip*.  ses-print-cell is always nil here
      (ses-set-cell row (1+ col) 'value nil)
      (1value (ses-print-cell row (1+ col))))))

(defun ses-reconstruct-all ()
  "Reconstruct buffer based on cell data stored in Emacs variables."
  (interactive "*")
  (ses-begin-change)
  ;;Reconstruct reference lists.
  (let (x yrow ycol)
    ;;Delete old reference lists
    (dotimes-with-progress-reporter
        (row ses--numrows) "Deleting references..."
      (dotimes (col ses--numcols)
	(ses-set-cell row col 'references nil)))
    ;;Create new reference lists
    (dotimes-with-progress-reporter
        (row ses--numrows) "Computing references..."
      (dotimes (col ses--numcols)
	(dolist (ref (ses-formula-references (ses-cell-formula row col)))
	  (setq x    (ses-sym-rowcol ref)
		yrow (car x)
		ycol (cdr x))
	  (ses-set-cell yrow ycol 'references
			(cons (ses-cell-symbol row col)
			      (ses-cell-references yrow ycol)))))))
  ;;Delete everything and reconstruct basic data area
  (ses-widen)
  (let ((inhibit-read-only t))
    (goto-char (point-max))
    (if (search-backward ";; Local Variables:\n" nil t)
	(delete-region (point-min) (point))
      ;;Buffer is quite screwed up - can't even save the user-specified locals
      (delete-region (point-min) (point-max))
      (insert ses-initial-file-trailer)
      (goto-char (point-min)))
    ;;Create a blank display area
    (dotimes (row ses--numrows)
      (insert ses--blank-line))
    (insert ses-print-data-boundary)
    (backward-char (1- (length ses-print-data-boundary)))
    (setq ses--data-marker (point-marker))
    (forward-char (1- (length ses-print-data-boundary)))
    ;;Placeholders for cell data
    (insert (make-string (* ses--numrows (1+ ses--numcols)) ?\n))
    ;;Placeholders for col-widths, col-printers, default-printer, header-row
    (insert "\n\n\n\n")
    (insert ses-initial-global-parameters)
    (backward-char (1- (length ses-initial-global-parameters)))
    (setq ses--params-marker (point-marker))
    (forward-char (1- (length ses-initial-global-parameters))))
  (ses-set-parameter 'ses--col-widths ses--col-widths)
  (ses-set-parameter 'ses--col-printers ses--col-printers)
  (ses-set-parameter 'ses--default-printer ses--default-printer)
  (ses-set-parameter 'ses--header-row ses--header-row)
  (ses-set-parameter 'ses--numrows ses--numrows)
  (ses-set-parameter 'ses--numcols ses--numcols)
  ;;Keep our old narrowing
  (ses-setup)
  (ses-recalculate-all)
  (goto-char (point-min)))


;;----------------------------------------------------------------------------
;; Input of cell formulas
;;----------------------------------------------------------------------------

(defun ses-edit-cell (row col newval)
  "Display current cell contents in minibuffer, for editing.  Returns nil if
cell formula was unsafe and user declined confirmation."
  (interactive
   (progn
     (barf-if-buffer-read-only)
     (ses-check-curcell)
     (let* ((rowcol  (ses-sym-rowcol ses--curcell))
	    (row     (car rowcol))
	    (col     (cdr rowcol))
	    (formula (ses-cell-formula row col))
	    initial)
       (if (eq (car-safe formula) 'ses-safe-formula)
	   (setq formula (cadr formula)))
       (if (eq (car-safe formula) 'quote)
	   (setq initial (format "'%S" (cadr formula)))
	 (setq initial (prin1-to-string formula)))
       (if (stringp formula)
	   ;;Position cursor inside close-quote
	   (setq initial (cons initial (length initial))))
       (list row col
	     (read-from-minibuffer (format "Cell %s: " ses--curcell)
				   initial
				   ses-mode-edit-map
				   t ;Convert to Lisp object
				   'ses-read-cell-history)))))
  (when (ses-warn-unsafe newval 'unsafep)
    (ses-begin-change)
    (ses-cell-set-formula row col newval)
    t))

(defun ses-read-cell (row col newval)
  "Self-insert for initial character of cell function."
  (interactive
   (let* ((initial (this-command-keys))
          (rowcol  (progn (ses-check-curcell) (ses-sym-rowcol ses--curcell)))
          (curval (ses-cell-formula (car rowcol) (cdr rowcol))))
     (barf-if-buffer-read-only)
     (list (car rowcol)
	   (cdr rowcol)
           (read-from-minibuffer
            (format "Cell %s: " ses--curcell)
            (cons (if (equal initial "\"") "\"\""
                    (if (equal initial "(") "()" initial)) 2)
            ses-mode-edit-map
            t                         ;Convert to Lisp object
            'ses-read-cell-history
            (prin1-to-string (if (eq (car-safe curval) 'ses-safe-formula)
				 (cadr curval)
			       curval))))))
  (when (ses-edit-cell row col newval)
    (ses-command-hook) ;Update cell widths before movement
    (dolist (x ses-after-entry-functions)
      (funcall x 1))))

(defun ses-read-symbol (row col symb)
  "Self-insert for a symbol as a cell formula.  The set of all symbols that
have been used as formulas in this spreadsheet is available for completions."
  (interactive
   (let ((rowcol (progn (ses-check-curcell) (ses-sym-rowcol ses--curcell)))
	 newval)
     (barf-if-buffer-read-only)
     (setq newval (completing-read (format "Cell %s ': " ses--curcell)
				   ses--symbolic-formulas))
     (list (car rowcol)
	   (cdr rowcol)
	   (if (string= newval "")
	       nil ;Don't create zero-length symbols!
	     (list 'quote (intern newval))))))
  (when (ses-edit-cell row col symb)
    (ses-command-hook) ;Update cell widths before movement
    (dolist (x ses-after-entry-functions)
      (funcall x 1))))

(defun ses-clear-cell-forward (count)
  "Delete formula and printer for current cell and then move to next cell.
With prefix, deletes several cells."
  (interactive "*p")
  (if (< count 0)
      (1value (ses-clear-cell-backward (- count)))
    (ses-check-curcell)
    (ses-begin-change)
    (dotimes (x count)
      (ses-set-curcell)
      (let ((rowcol (ses-sym-rowcol ses--curcell)))
	(or rowcol (signal 'end-of-buffer nil))
	(ses-clear-cell (car rowcol) (cdr rowcol)))
      (forward-char 1))))

(defun ses-clear-cell-backward (count)
  "Move to previous cell and then delete it.  With prefix, deletes several
cells."
  (interactive "*p")
  (if (< count 0)
      (1value (ses-clear-cell-forward (- count)))
    (ses-check-curcell 'end)
    (ses-begin-change)
    (dotimes (x count)
      (backward-char 1) ;Will signal 'beginning-of-buffer if appropriate
      (ses-set-curcell)
      (let ((rowcol (ses-sym-rowcol ses--curcell)))
	(ses-clear-cell (car rowcol) (cdr rowcol))))))


;;----------------------------------------------------------------------------
;; Input of cell-printer functions
;;----------------------------------------------------------------------------

(defun ses-read-printer (prompt default)
  "Common code for `ses-read-cell-printer', `ses-read-column-printer', and `ses-read-default-printer'.
PROMPT should end with \": \".  Result is t if operation was cancelled."
  (barf-if-buffer-read-only)
  (if (eq default t)
      (setq default "")
    (setq prompt (format "%s [currently %S]: "
			 (substring prompt 0 -2)
			 default)))
  (let ((new (read-from-minibuffer prompt
				   nil ;Initial contents
				   ses-mode-edit-map
				   t   ;Evaluate the result
				   'ses-read-printer-history
				   (prin1-to-string default))))
    (if (equal new default)
	;;User changed mind, decided not to change printer
	(setq new t)
      (ses-printer-validate new)
      (or (not new)
	  (stringp new)
	  (stringp (car-safe new))
	  (ses-warn-unsafe new 'unsafep-function)
	  (setq new t)))
    new))

(defun ses-read-cell-printer (newval)
  "Set the printer function for the current cell or range.

A printer function is either a string (a format control-string with one
%-sequence -- result from format will be right-justified), or a list of one
string (result from format will be left-justified), or a lambda-expression of
one argument, or a symbol that names a function of one argument.  In the
latter two cases, the function's result should be either a string (will be
right-justified) or a list of one string (will be left-justified)."
  (interactive
   (let ((default t)
	 x)
     (ses-check-curcell 'range)
     ;;Default is none if not all cells in range have same printer
     (catch 'ses-read-cell-printer
       (ses-dorange ses--curcell
	 (setq x (ses-cell-printer row col))
	 (if (eq (car-safe x) 'ses-safe-printer)
	     (setq x (cadr x)))
	 (if (eq default t)
	     (setq default x)
	   (unless (equal default x)
	     ;;Range contains differing printer functions
	     (setq default t)
	     (throw 'ses-read-cell-printer t)))))
     (list (ses-read-printer (format "Cell %S printer: " ses--curcell)
			     default))))
  (unless (eq newval t)
    (ses-begin-change)
    (ses-dorange ses--curcell
      (ses-set-cell row col 'printer newval)
      (ses-print-cell row col))))

(defun ses-read-column-printer (col newval)
  "Set the printer function for the current column.  See
`ses-read-cell-printer' for input forms."
  (interactive
   (let ((col (cdr (ses-sym-rowcol ses--curcell))))
     (ses-check-curcell)
     (list col (ses-read-printer (format "Column %s printer: "
					 (ses-column-letter col))
				 (ses-col-printer col)))))

  (unless (eq newval t)
    (ses-begin-change)
    (ses-set-parameter 'ses--col-printers newval col)
    (save-excursion
      (dotimes (row ses--numrows)
	(ses-print-cell row col)))))

(defun ses-read-default-printer (newval)
  "Set the default printer function for cells that have no other.  See
`ses-read-cell-printer' for input forms."
  (interactive
   (list (ses-read-printer "Default printer: " ses--default-printer)))
  (unless (eq newval t)
    (ses-begin-change)
    (ses-set-parameter 'ses--default-printer newval)
    (ses-reprint-all t)))


;;----------------------------------------------------------------------------
;; Spreadsheet size adjustments
;;----------------------------------------------------------------------------

(defun ses-insert-row (count)
  "Insert a new row before the current one.  With prefix, insert COUNT rows
before current one."
  (interactive "*p")
  (ses-check-curcell 'end)
  (or (> count 0) (signal 'args-out-of-range nil))
  (ses-begin-change)
  (let ((inhibit-quit t)
	(inhibit-read-only t)
	(row (or (car (ses-sym-rowcol ses--curcell)) ses--numrows))
	newrow)
    ;;Create a new set of cell-variables
    (ses-create-cell-variable-range ses--numrows (+ ses--numrows count -1)
				    0            (1- ses--numcols))
    (ses-set-parameter 'ses--numrows (+ ses--numrows count))
    ;;Insert each row
    (ses-goto-print row 0)
    (dotimes-with-progress-reporter (x count) "Inserting row..."
      ;;Create a row of empty cells.  The `symbol' fields will be set by
      ;;the call to ses-relocate-all.
      (setq newrow (make-vector ses--numcols nil))
      (dotimes (col ses--numcols)
	(aset newrow col (ses-make-cell)))
      (setq ses--cells (ses-vector-insert ses--cells row newrow))
      (push `(apply ses-vector-delete ses--cells ,row 1) buffer-undo-list)
      (insert ses--blank-line))
    ;;Insert empty lines in cell data area (will be replaced by
    ;;ses-relocate-all)
    (ses-goto-data row 0)
    (insert (make-string (* (1+ ses--numcols) count) ?\n))
    (ses-relocate-all row 0 count 0)
    ;;If any cell printers insert constant text, insert that text
    ;;into the line.
    (let ((cols   (mapconcat #'ses-call-printer ses--col-printers nil))
	  (global (ses-call-printer ses--default-printer)))
      (if (or (> (length cols) 0) (> (length global) 0))
	  (dotimes (x count)
	    (dotimes (col ses--numcols)
	      ;;These cells are always nil, only constant formatting printed
	      (1value (ses-print-cell (+ x row) col))))))
    (when (> ses--header-row row)
      ;;Inserting before header
      (ses-set-parameter 'ses--header-row (+ ses--header-row count))
      (ses-reset-header-string)))
  ;;Reconstruct text attributes
  (ses-setup)
  ;;Prepare for undo
  (push '(apply ses-widen) buffer-undo-list)
  ;;Return to current cell
  (if ses--curcell
      (ses-jump-safe ses--curcell)
    (ses-goto-print (1- ses--numrows) 0)))

(defun ses-delete-row (count)
  "Delete the current row.  With prefix, Deletes COUNT rows starting from the
current one."
  (interactive "*p")
  (ses-check-curcell)
  (or (> count 0) (signal 'args-out-of-range nil))
  (let ((inhibit-quit t)
	(inhibit-read-only t)
	(row (car (ses-sym-rowcol ses--curcell))))
    (setq count (min count (- ses--numrows row)))
    (ses-begin-change)
    (ses-set-parameter 'ses--numrows (- ses--numrows count))
    ;;Delete lines from print area
    (ses-goto-print row 0)
    (ses-delete-line count)
    ;;Delete lines from cell data area
    (ses-goto-data row 0)
    (ses-delete-line (* count (1+ ses--numcols)))
    ;;Relocate variables and formulas
    (ses-set-with-undo 'ses--cells (ses-vector-delete ses--cells row count))
    (ses-relocate-all row 0 (- count) 0)
    (ses-destroy-cell-variable-range ses--numrows (+ ses--numrows count -1)
				     0            (1- ses--numcols))
    (when (> ses--header-row row)
      (if (<= ses--header-row (+ row count))
	  ;;Deleting the header row
	  (ses-set-parameter 'ses--header-row 0)
	(ses-set-parameter 'ses--header-row (- ses--header-row count)))
      (ses-reset-header-string)))
  ;;Reconstruct attributes
  (ses-setup)
  ;;Prepare for undo
  (push '(apply ses-widen) buffer-undo-list)
  (ses-jump-safe ses--curcell))

(defun ses-insert-column (count &optional col width printer)
  "Insert a new column before COL (default is the current one).
With prefix, insert COUNT columns before current one.
If COL is specified, the new column(s) get the specified WIDTH and PRINTER
\(otherwise they're taken from the current column)."
  (interactive "*p")
  (ses-check-curcell)
  (or (> count 0) (signal 'args-out-of-range nil))
  (or col
      (setq col     (cdr (ses-sym-rowcol ses--curcell))
	    width   (ses-col-width col)
	    printer (ses-col-printer col)))
  (ses-begin-change)
  (let ((inhibit-quit t)
	(inhibit-read-only t)
	(widths   ses--col-widths)
	(printers ses--col-printers)
	has-skip)
    ;;Create a new set of cell-variables
    (ses-create-cell-variable-range 0            (1- ses--numrows)
				    ses--numcols (+ ses--numcols count -1))
    ;;Insert each column.
    (dotimes-with-progress-reporter (x count) "Inserting column..."
      ;;Create a column of empty cells.  The `symbol' fields will be set by
      ;;the call to ses-relocate-all.
      (ses-adjust-print-width col (1+ width))
      (ses-set-parameter 'ses--numcols (1+ ses--numcols))
      (dotimes (row ses--numrows)
	(and (< (1+ col) ses--numcols) (eq (ses-cell-value row col) '*skip*)
	     ;;Inserting in the middle of a spill-over
	     (setq has-skip t))
	(ses-aset-with-undo ses--cells row
			    (ses-vector-insert (aref ses--cells row)
					       col (ses-make-cell)))
	;;Insert empty lines in cell data area (will be replaced by
	;;ses-relocate-all)
	(ses-goto-data row col)
	(insert ?\n))
      ;;Insert column width and printer
      (setq widths      (ses-vector-insert widths col width)
	    printers    (ses-vector-insert printers col printer)))
    (ses-set-parameter 'ses--col-widths widths)
    (ses-set-parameter 'ses--col-printers printers)
    (ses-reset-header-string)
    (ses-relocate-all 0 col 0 count)
    (if has-skip
	(ses-reprint-all t)
      (when (or (> (length (ses-call-printer printer)) 0)
		(> (length (ses-call-printer ses--default-printer)) 0))
	;;Either column printer or global printer inserts some constant text
	;;Reprint the new columns to insert that text.
	(dotimes (x ses--numrows)
	  (dotimes (y count)
	    ;Always nil here - this is a blank column
	    (1value (ses-print-cell-new-width x (+ y col))))))
      (ses-setup)))
  (ses-jump-safe ses--curcell))

(defun ses-delete-column (count)
  "Delete the current column.  With prefix, Deletes COUNT columns starting
from the current one."
  (interactive "*p")
  (ses-check-curcell)
  (or (> count 0) (signal 'args-out-of-range nil))
  (let ((inhibit-quit t)
	(inhibit-read-only t)
	(rowcol  (ses-sym-rowcol ses--curcell))
	(width 0)
	col origrow has-skip)
    (setq origrow (car rowcol)
	  col     (cdr rowcol)
	  count   (min count (- ses--numcols col)))
    (if (= count ses--numcols)
	(error "Can't delete all columns!"))
    ;;Determine width of column(s) being deleted
    (dotimes (x count)
      (setq width (+ width (ses-col-width (+ col x)) 1)))
    (ses-begin-change)
    (ses-set-parameter 'ses--numcols (- ses--numcols count))
    (ses-adjust-print-width col (- width))
    (dotimes-with-progress-reporter (row ses--numrows) "Deleting column..."
      ;;Delete lines from cell data area
      (ses-goto-data row col)
      (ses-delete-line count)
      ;;Delete cells.  Check if deletion area begins or ends with a skip.
      (if (or (eq (ses-cell-value row col) '*skip*)
	      (and (< col ses--numcols)
		   (eq (ses-cell-value row (+ col count)) '*skip*)))
	  (setq has-skip t))
      (ses-aset-with-undo ses--cells row
			  (ses-vector-delete (aref ses--cells row) col count)))
    ;;Update globals
    (ses-set-parameter 'ses--col-widths
		       (ses-vector-delete ses--col-widths col count))
    (ses-set-parameter 'ses--col-printers
		       (ses-vector-delete ses--col-printers col count))
    (ses-reset-header-string)
    ;;Relocate variables and formulas
    (ses-relocate-all 0 col 0 (- count))
    (ses-destroy-cell-variable-range 0            (1- ses--numrows)
				     ses--numcols (+ ses--numcols count -1))
    (if has-skip
	(ses-reprint-all t)
      (ses-setup))
    (if (>= col ses--numcols)
	(setq col (1- col)))
    (ses-goto-print origrow col)))

(defun ses-forward-or-insert (&optional count)
  "Move to next cell in row, or inserts a new cell if already in last one, or
inserts a new row if at bottom of print area.  Repeat COUNT times."
  (interactive "p")
  (ses-check-curcell 'end)
  (setq deactivate-mark t) ;Doesn't combine well with ranges
  (dotimes (x count)
    (ses-set-curcell)
    (if (not ses--curcell)
	(progn ;At bottom of print area
	  (barf-if-buffer-read-only)
	  (ses-insert-row 1))
      (let ((col (cdr (ses-sym-rowcol ses--curcell))))
	(when (/= 32
		  (char-before (next-single-property-change (point)
							    'intangible)))
	  ;;We're already in last nonskipped cell on line.  Need to create a
	  ;;new column.
	  (barf-if-buffer-read-only)
	  (ses-insert-column (- count x)
			     ses--numcols
			     (ses-col-width col)
			     (ses-col-printer col)))))
    (forward-char)))

(defun ses-append-row-jump-first-column ()
  "Insert a new row after current one and jumps to its first column."
  (interactive "*")
  (ses-check-curcell)
  (ses-begin-change)
  (beginning-of-line 2)
  (ses-set-curcell)
  (ses-insert-row 1))

(defun ses-set-column-width (col newwidth)
  "Set the width of the current column."
  (interactive
   (let ((col (cdr (progn (ses-check-curcell) (ses-sym-rowcol ses--curcell)))))
     (barf-if-buffer-read-only)
     (list col
	   (if current-prefix-arg
	       (prefix-numeric-value current-prefix-arg)
	     (read-from-minibuffer (format "Column %s width [currently %d]: "
					   (ses-column-letter col)
					   (ses-col-width col))
				   nil  ;No initial contents
				   nil  ;No override keymap
				   t    ;Convert to Lisp object
				   nil  ;No history
				   (number-to-string
				    (ses-col-width col))))))) ;Default value
  (if (< newwidth 1)
      (error "Invalid column width"))
  (ses-begin-change)
  (ses-reset-header-string)
  (save-excursion
    (let ((inhibit-quit t))
      (ses-adjust-print-width col (- newwidth (ses-col-width col)))
      (ses-set-parameter 'ses--col-widths newwidth col))
    (dotimes (row ses--numrows)
      (ses-print-cell-new-width row col))))


;;----------------------------------------------------------------------------
;; Cut and paste, import and export
;;----------------------------------------------------------------------------

(defadvice copy-region-as-kill (around ses-copy-region-as-kill
				activate preactivate)
  "It doesn't make sense to copy read-only or intangible attributes into the
kill ring.  It probably doesn't make sense to copy keymap properties.
We'll assume copying front-sticky properties doesn't make sense, either.

This advice also includes some SES-specific code because otherwise it's too
hard to override how mouse-1 works."
  (when (> beg end)
    (let ((temp beg))
      (setq beg end
	    end temp)))
  (if (not (and (eq major-mode 'ses-mode)
		(eq (get-text-property beg 'read-only) 'ses)
		(eq (get-text-property (1- end) 'read-only) 'ses)))
      ad-do-it ;Normal copy-region-as-kill
    (kill-new (ses-copy-region beg end))
    (if transient-mark-mode
	(setq deactivate-mark t))
    nil))

(defun ses-copy-region (beg end)
  "Treat the region as rectangular.  Convert the intangible attributes to
SES attributes recording the contents of the cell as of the time of copying."
  (let* ((inhibit-point-motion-hooks t)
	 (x (mapconcat 'ses-copy-region-helper
		       (extract-rectangle beg (1- end)) "\n")))
    (remove-text-properties 0 (length x)
			    '(read-only t
			      intangible t
			      keymap t
			      front-sticky t)
			    x)
    x))

(defun ses-copy-region-helper (line)
  "Converts one line (of a rectangle being extracted from a spreadsheet) to
external form by attaching to each print cell a 'ses attribute that records
the corresponding data cell."
  (or (> (length line) 1)
      (error "Empty range"))
  (let ((inhibit-read-only t)
	(pos 0)
	mycell next sym rowcol)
    (while pos
      (setq sym    (get-text-property pos 'intangible line)
	    next   (next-single-property-change pos 'intangible line)
	    rowcol (ses-sym-rowcol sym)
	    mycell (ses-get-cell (car rowcol) (cdr rowcol)))
      (put-text-property pos (or next (length line))
			 'ses
			 (list (ses-cell-symbol  mycell)
			       (ses-cell-formula mycell)
			       (ses-cell-printer mycell))
			 line)
      (setq pos next)))
  line)

(defun ses-kill-override (beg end)
  "Generic override for any commands that kill text.  We clear the killed
cells instead of deleting them."
  (interactive "r")
  (ses-check-curcell 'needrange)
  ;;For some reason, the text-read-only error is not caught by
  ;;`delete-region', so we have to use subterfuge.
  (let ((buffer-read-only t))
    (1value (condition-case x
		(noreturn (funcall (lookup-key (current-global-map)
					       (this-command-keys))
				   beg end))
	      (buffer-read-only nil)))) ;The expected error
  ;;Because the buffer was marked read-only, the kill command turned itself
  ;;into a copy.  Now we clear the cells or signal the error.  First we
  ;;check whether the buffer really is read-only.
  (barf-if-buffer-read-only)
  (ses-begin-change)
  (ses-dorange ses--curcell
    (ses-clear-cell row col))
  (ses-jump (car ses--curcell)))

(defadvice yank (around ses-yank activate preactivate)
  "In SES mode, the yanked text is inserted as cells.

If the text contains 'ses attributes (meaning it went to the kill-ring from a
SES buffer), the formulas and print functions are restored for the cells.  If
the text contains tabs, this is an insertion of tab-separated formulas.
Otherwise the text is inserted as the formula for the current cell.

When inserting cells, the formulas are usually relocated to keep the same
relative references to neighboring cells.  This is best if the formulas
generally refer to other cells within the yanked text.  You can use the C-u
prefix to specify insertion without relocation, which is best when the
formulas refer to cells outsite the yanked text.

When inserting formulas, the text is treated as a string constant if it doesn't
make sense as a sexp or would otherwise be considered a symbol.  Use 'sym to
explicitly insert a symbol, or use the C-u prefix to treat all unmarked words
as symbols."
  (if (not (and (eq major-mode 'ses-mode)
		(eq (get-text-property (point) 'keymap) 'ses-mode-print-map)))
      ad-do-it ;Normal non-SES yank
    (ses-check-curcell 'end)
    (push-mark (point))
    (let ((text (current-kill (cond
			       ((listp arg)  0)
			       ((eq arg '-)  -1)
			       (t            (1- arg))))))
      (or (ses-yank-cells text arg)
	  (ses-yank-tsf text arg)
	  (ses-yank-one (ses-yank-resize 1 1)
			text
			0
			(if (memq (aref text (1- (length text))) '(?\t ?\n))
			    ;;Just one cell - delete final tab or newline
			    (1- (length text)))
			arg)))
    (if (consp arg)
	(exchange-point-and-mark))))

(defun ses-yank-pop (arg)
  "Replace just-yanked stretch of killed text with a different stretch.
This command is allowed only immediately after a `yank' or a `yank-pop', when
the region contains a stretch of reinserted previously-killed text.  We
replace it with a different stretch of killed text.
  Unlike standard `yank-pop', this function uses `undo' to delete the
previous insertion."
  (interactive "*p")
  (or (eq last-command 'yank)
      ;;Use noreturn here just to avoid a "poor-coverage" warning in its
      ;;macro definition.
      (noreturn (error "Previous command was not a yank")))
  (undo)
  (ses-set-curcell)
  (yank (1+ (or arg 1)))
  (setq this-command 'yank))

(defun ses-yank-cells (text arg)
  "If the TEXT has a proper set of 'ses attributes, inserts the text as
cells, else return nil.  The cells are reprinted--the supplied text is
ignored because the column widths, default printer, etc. at yank time might
be different from those at kill-time.  ARG is a list to indicate that
formulas are to be inserted without relocation."
  (let ((first (get-text-property 0 'ses text))
	(last  (get-text-property (1- (length text)) 'ses text)))
    (when (and first last) ;;Otherwise not proper set of attributes
      (setq first    (ses-sym-rowcol (car first))
	    last     (ses-sym-rowcol (car last)))
      (let* ((needrows (- (car last) (car first) -1))
	     (needcols (- (cdr last) (cdr first) -1))
	     (rowcol   (ses-yank-resize needrows needcols))
	     (rowincr  (- (car rowcol) (car first)))
	     (colincr  (- (cdr rowcol) (cdr first)))
	     (pos      0)
	     myrow mycol x)
	(dotimes-with-progress-reporter (row needrows) "Yanking..."
	  (setq myrow (+ row (car rowcol)))
	  (dotimes (col needcols)
	    (setq mycol (+ col (cdr rowcol))
		  last (get-text-property pos 'ses text)
		  pos  (next-single-property-change pos 'ses text)
		  x    (ses-sym-rowcol (car last)))
	    (if (not last)
		;;Newline - all remaining cells on row are skipped
		(setq x   (cons (- myrow rowincr) (+ needcols colincr -1))
		      last (list nil nil nil)
		      pos  (1- pos)))
	    (if (/= (car x) (- myrow rowincr))
		(error "Cell row error"))
	    (if (< (- mycol colincr) (cdr x))
		;;Some columns were skipped
		(let ((oldcol mycol))
		  (while (< (- mycol colincr) (cdr x))
		    (ses-clear-cell myrow mycol)
		    (setq col   (1+ col)
			  mycol (1+ mycol)))
		  (ses-print-cell myrow (1- oldcol)))) ;;This inserts *skip*
	    (when (car last) ;Skip this for *skip* cells
	      (setq x (nth 2 last))
	      (unless (equal x (ses-cell-printer myrow mycol))
		(or (not x)
		    (stringp x)
		    (eq (car-safe x) 'ses-safe-printer)
		    (setq x `(ses-safe-printer ,x)))
		(ses-set-cell myrow mycol 'printer x))
	      (setq x (cadr last))
	      (if (atom arg)
		  (setq x (ses-relocate-formula x 0 0 rowincr colincr)))
	      (or (atom x)
		  (eq (car-safe x) 'ses-safe-formula)
		  (setq x `(ses-safe-formula ,x)))
	      (ses-cell-set-formula myrow mycol x)))
	  (when pos
	    (if (get-text-property pos 'ses text)
		(error "Missing newline between rows"))
	    (setq pos (next-single-property-change pos 'ses text))))
	t))))

(defun ses-yank-one (rowcol text from to arg)
  "Insert the substring [FROM,TO] of TEXT as the formula for cell ROWCOL (a
cons of ROW and COL).  Treat plain symbols as strings unless ARG is a list."
  (let ((val (condition-case nil
		 (read-from-string text from to)
	       (error (cons nil from)))))
    (cond
     ((< (cdr val) (or to (length text)))
      ;;Invalid sexp - leave it as a string
      (setq val (substring text from to)))
     ((and (car val) (symbolp (car val)))
      (if (consp arg)
	  (setq val (list 'quote (car val)))  ;Keep symbol
	(setq val (substring text from to)))) ;Treat symbol as text
     (t
      (setq val (car val))))
    (let ((row (car rowcol))
	  (col (cdr rowcol)))
      (or (atom val)
	  (setq val `(ses-safe-formula ,val)))
      (ses-cell-set-formula row col val))))

(defun ses-yank-tsf (text arg)
  "If TEXT contains tabs and/or newlines, treats the tabs as
column-separators and the newlines as row-separators and inserts the text as
cell formulas--else return nil.  Treat plain symbols as strings unless ARG
is a list.  Ignore a final newline."
  (if (or (not (string-match "[\t\n]" text))
	  (= (match-end 0) (length text)))
      ;;Not TSF format
      nil
    (if (/= (aref text (1- (length text))) ?\n)
	(setq text (concat text "\n")))
    (let ((pos      -1)
	  (spots    (list -1))
	  (cols     0)
	  (needrows 0)
	  needcols rowcol)
      ;;Find all the tabs and newlines
      (while (setq pos (string-match "[\t\n]" text (1+ pos)))
	(push pos spots)
	(setq cols (1+ cols))
	(when (eq (aref text pos) ?\n)
	  (if (not needcols)
	      (setq needcols cols)
	    (or (= needcols cols)
		(error "Inconsistent row lengths")))
	  (setq cols     0
		needrows (1+ needrows))))
      ;;Insert the formulas
      (setq rowcol (ses-yank-resize needrows needcols))
      (dotimes (row needrows)
	(dotimes (col needcols)
	  (ses-yank-one (cons (+ (car rowcol) needrows (- row) -1)
			      (+ (cdr rowcol) needcols (- col) -1))
			text (1+ (cadr spots)) (car spots) arg)
	  (setq spots (cdr spots))))
      (ses-goto-print (+ (car rowcol) needrows -1)
		      (+ (cdr rowcol) needcols -1))
      t)))

(defun ses-yank-resize (needrows needcols)
  "If this yank will require inserting rows and/or columns, asks for
confirmation and then inserts them.  Result is (row,col) for top left of yank
spot, or error signal if user requests cancel."
  (ses-begin-change)
  (let ((rowcol (if ses--curcell
		    (ses-sym-rowcol ses--curcell)
		  (cons ses--numrows 0)))
	rowbool colbool)
    (setq needrows (- (+ (car rowcol) needrows) ses--numrows)
	  needcols (- (+ (cdr rowcol) needcols) ses--numcols)
	  rowbool  (> needrows 0)
	  colbool  (> needcols 0))
    (when (or rowbool colbool)
      ;;Need to insert.  Get confirm
      (or (y-or-n-p (format "Yank will insert %s%s%s.  Continue? "
			    (if rowbool (format "%d rows" needrows) "")
			    (if (and rowbool colbool) " and " "")
			    (if colbool (format "%d columns" needcols) "")))
	  (error "Cancelled"))
      (when rowbool
	(let (ses--curcell)
	  (save-excursion
	    (ses-goto-print ses--numrows 0)
	    (ses-insert-row needrows))))
      (when colbool
	  (ses-insert-column needcols
			     ses--numcols
			     (ses-col-width (1- ses--numcols))
			     (ses-col-printer (1- ses--numcols)))))
    rowcol))

(defun ses-export-tsv (beg end)
  "Export values from the current range, with tabs between columns and
newlines between rows.  Result is placed in kill ring."
  (interactive "r")
  (ses-export-tab nil))

(defun ses-export-tsf (beg end)
  "Export formulas from the current range, with tabs between columns and
newlines between rows.  Result is placed in kill ring."
  (interactive "r")
  (ses-export-tab t))

(defun ses-export-tab (want-formulas)
  "Export the current range with tabs between columns and newlines between
rows.  Result is placed in kill ring.  The export is values unless
WANT-FORMULAS is non-nil.  Newlines and tabs in the export text are escaped."
  (ses-check-curcell 'needrange)
  (let ((print-escape-newlines t)
	result item)
    (ses-dorange ses--curcell
      (setq item (if want-formulas
		     (ses-cell-formula row col)
		   (ses-cell-value row col)))
      (if (eq (car-safe item) 'ses-safe-formula)
	  ;;Hide our deferred safety-check marker
	  (setq item (cadr item)))
      (if (or (not item) (eq item '*skip*))
	  (setq item ""))
      (when (eq (car-safe item) 'quote)
	(push "'" result)
	(setq item (cadr item)))
      (setq item (prin1-to-string item t))
      (setq item (replace-regexp-in-string "\t" "\\\\t" item))
      (push item result)
      (cond
       ((< col maxcol)
	(push "\t" result))
       ((< row maxrow)
	(push "\n" result))))
    (setq result (apply 'concat (nreverse result)))
    (kill-new result)))


;;----------------------------------------------------------------------------
;; Other user commands
;;----------------------------------------------------------------------------

(defun ses-unset-header-row ()
  "Select the default header row."
  (interactive)
  (ses-set-header-row 0))

(defun ses-set-header-row (row)
  "Set the ROW to display in the header-line.
With a numerical prefix arg, use that row.
With no prefix arg, use the current row.
With a \\[universal-argument] prefix arg, prompt the user.
The top row is row 1.  Selecting row 0 displays the default header row."
  (interactive
   (list (if (numberp current-prefix-arg) current-prefix-arg
	   (let ((currow (1+ (car (ses-sym-rowcol ses--curcell)))))
	     (if current-prefix-arg
		 (read-number "Header row: " currow)
	       currow)))))
  (if (or (< row 0) (> row ses--numrows))
      (error "Invalid header-row"))
  (ses-begin-change)
  (let ((oldval ses--header-row))
    (let (buffer-undo-list)
      (ses-set-parameter 'ses--header-row row))
    (push `(apply ses-set-header-row ,oldval) buffer-undo-list))
  (ses-reset-header-string))

(defun ses-mark-row ()
  "Marks the entirety of current row as a range."
  (interactive)
  (ses-check-curcell 'range)
  (let ((row (car (ses-sym-rowcol (or (car-safe ses--curcell) ses--curcell)))))
    (push-mark (point))
    (ses-goto-print (1+ row) 0)
    (push-mark (point) nil t)
    (ses-goto-print row 0)))

(defun ses-mark-column ()
  "Marks the entirety of current column as a range."
  (interactive)
  (ses-check-curcell 'range)
  (let ((col (cdr (ses-sym-rowcol (or (car-safe ses--curcell) ses--curcell))))
	(row 0))
    (push-mark (point))
    (ses-goto-print (1- ses--numrows) col)
    (forward-char 1)
    (push-mark (point) nil t)
    (while (eq '*skip* (ses-cell-value row col))
      ;;Skip over initial cells in column that can't be selected
      (setq row (1+ row)))
    (ses-goto-print row col)))

(defun ses-end-of-line ()
  "Move point to last cell on line."
  (interactive)
  (ses-check-curcell 'end 'range)
  (when ses--curcell  ;Otherwise we're at the bottom row, which is empty anyway
    (let ((col (1- ses--numcols))
	  row rowcol)
      (if (symbolp ses--curcell)
	  ;;Single cell
	  (setq row (car (ses-sym-rowcol ses--curcell)))
	;;Range - use whichever end of the range the point is at
	(setq rowcol (ses-sym-rowcol (if (< (point) (mark))
				     (car ses--curcell)
				   (cdr ses--curcell))))
	;;If range already includes the last cell in a row, point is actually
	;;in the following row
	(if (<= (cdr rowcol) (1- col))
	    (setq row (car rowcol))
	  (setq row (1+ (car rowcol)))
	  (if (= row ses--numrows)
	      ;;Already at end - can't go anywhere
	      (setq col 0))))
      (when (< row ses--numrows) ;Otherwise it's a range that includes last cell
	(while (eq (ses-cell-value row col) '*skip*)
	  ;;Back to beginning of multi-column cell
	  (setq col (1- col)))
	(ses-goto-print row col)))))

(defun ses-renarrow-buffer ()
  "Narrow the buffer so only the print area is visible.  Use after \\[widen]."
  (interactive)
  (setq ses--deferred-narrow t))

(defun ses-sort-column (sorter &optional reverse)
  "Sorts the range by a specified column.  With prefix, sorts in
REVERSE order."
  (interactive "*sSort column: \nP")
  (ses-check-curcell 'needrange)
  (let ((min (ses-sym-rowcol (car ses--curcell)))
	(max (ses-sym-rowcol (cdr ses--curcell))))
    (let ((minrow (car min))
	  (mincol (cdr min))
	  (maxrow (car max))
	  (maxcol (cdr max))
	  keys extracts end)
      (setq sorter (cdr (ses-sym-rowcol (intern (concat sorter "1")))))
      (or (and sorter (>= sorter mincol) (<= sorter maxcol))
	  (error "Invalid sort column"))
      ;;Get key columns and sort them
      (dotimes (x (- maxrow minrow -1))
	(ses-goto-print (+ minrow x) sorter)
	(setq end (next-single-property-change (point) 'intangible))
	(push (cons (buffer-substring-no-properties (point) end)
		    (+ minrow x))
	      keys))
      (setq keys (sort keys #'(lambda (x y) (string< (car x) (car y)))))
      ;;Extract the lines in reverse sorted order
      (or reverse
	  (setq keys (nreverse keys)))
      (dolist (x keys)
	(ses-goto-print (cdr x) (1+ maxcol))
	(setq end (point))
	(ses-goto-print (cdr x) mincol)
	(push (ses-copy-region (point) end) extracts))
      (deactivate-mark)
      ;;Paste the lines sequentially
      (dotimes (x (- maxrow minrow -1))
	(ses-goto-print (+ minrow x) mincol)
	(ses-set-curcell)
	(ses-yank-cells (pop extracts) nil)))))

(defun ses-sort-column-click (event reverse)
  "Mouse version of `ses-sort-column'."
  (interactive "*e\nP")
  (setq event (event-end event))
  (select-window (posn-window event))
  (setq event (car (posn-col-row event))) ;Click column
  (let ((col 0))
    (while (and (< col ses--numcols) (> event (ses-col-width col)))
      (setq event (- event (ses-col-width col) 1)
	    col   (1+ col)))
    (if (>= col ses--numcols)
	(ding)
      (ses-sort-column (ses-column-letter col) reverse))))

(defun ses-insert-range ()
  "Inserts into minibuffer the list of cells currently highlighted in the
spreadsheet."
  (interactive "*")
  (let (x)
    (with-current-buffer (window-buffer minibuffer-scroll-window)
      (ses-command-hook)  ;For ses-coverage
      (ses-check-curcell 'needrange)
      (setq x (cdr (macroexpand `(ses-range ,(car ses--curcell)
					    ,(cdr ses--curcell))))))
    (insert (substring (prin1-to-string (nreverse x)) 1 -1))))

(defun ses-insert-ses-range ()
  "Inserts \"(ses-range x y)\" in the minibuffer to represent the currently
highlighted range in the spreadsheet."
  (interactive "*")
  (let (x)
    (with-current-buffer (window-buffer minibuffer-scroll-window)
      (ses-command-hook)  ;For ses-coverage
      (ses-check-curcell 'needrange)
      (setq x (format "(ses-range %S %S)"
		      (car ses--curcell)
		      (cdr ses--curcell))))
    (insert x)))

(defun ses-insert-range-click (event)
  "Mouse version of `ses-insert-range'."
  (interactive "*e")
  (mouse-set-point event)
  (ses-insert-range))

(defun ses-insert-ses-range-click (event)
  "Mouse version of `ses-insert-ses-range'."
  (interactive "*e")
  (mouse-set-point event)
  (ses-insert-ses-range))


;;----------------------------------------------------------------------------
;; Checking formulas for safety
;;----------------------------------------------------------------------------

(defun ses-safe-printer (printer)
  "Returns PRINTER if safe, or the substitute printer `ses-unsafe' otherwise."
  (if (or (stringp printer)
	  (stringp (car-safe printer))
	  (not printer)
	  (ses-warn-unsafe printer 'unsafep-function))
      printer
    'ses-unsafe))

(defun ses-safe-formula (formula)
  "Returns FORMULA if safe, or the substitute formula *unsafe* otherwise."
  (if (ses-warn-unsafe formula 'unsafep)
      formula
    `(ses-unsafe ',formula)))

(defun ses-warn-unsafe (formula checker)
  "Applies CHECKER to FORMULA.  If result is non-nil, asks user for
confirmation about FORMULA, which might be unsafe.  Returns t if formula
is safe or user allows execution anyway.  Always returns t if
`safe-functions' is t."
  (if (eq safe-functions t)
      t
    (setq checker (funcall checker formula))
    (if (not checker)
	t
      (y-or-n-p (format "Formula %S\nmight be unsafe %S.  Process it? "
			formula checker)))))


;;----------------------------------------------------------------------------
;; Standard formulas
;;----------------------------------------------------------------------------

(defmacro ses-range (from to)
  "Expands to a list of cell-symbols for the range.  The range automatically
expands to include any new row or column inserted into its middle.  The SES
library code specifically looks for the symbol `ses-range', so don't create an
alias for this macro!"
  (let (result)
    (ses-dorange (cons from to)
      (push (ses-cell-symbol row col) result))
    (cons 'list result)))

(defun ses-delete-blanks (&rest args)
  "Return ARGS reversed, with the blank elements (nil and *skip*) removed."
  (let (result)
    (dolist (cur args)
      (unless (memq cur '(nil *skip*))
	(push cur result)))
    result))

(defun ses+ (&rest args)
  "Compute the sum of the arguments, ignoring blanks."
  (apply '+ (apply 'ses-delete-blanks args)))

(defun ses-average (list)
  "Computes the sum of the numbers in LIST, divided by their length.  Blanks
are ignored.  Result is always floating-point, even if all args are integers."
  (setq list (apply 'ses-delete-blanks list))
  (/ (float (apply '+ list)) (length list)))

(defmacro ses-select (fromrange test torange)
  "Select cells in FROMRANGE that are `equal' to TEST.  For each match, return
the corresponding cell from TORANGE.  The ranges are macroexpanded but not
evaluated so they should be either (ses-range BEG END) or (list ...).  The
TEST is evaluated."
  (setq fromrange (cdr (macroexpand fromrange))
	torange   (cdr (macroexpand torange))
	test      (eval test))
  (or (= (length fromrange) (length torange))
      (error "ses-select: Ranges not same length"))
  (let (result)
    (dolist (x fromrange)
      (if (equal test (symbol-value x))
	  (push (car torange) result))
      (setq torange (cdr torange)))
    (cons 'list result)))

;;All standard formulas are safe
(dolist (x '(ses-cell-value ses-range ses-delete-blanks ses+ ses-average
	     ses-select))
  (put x 'side-effect-free t))


;;----------------------------------------------------------------------------
;; Standard print functions
;;----------------------------------------------------------------------------

;;These functions use the variables 'row' and 'col' that are
;;dynamically bound by ses-print-cell.  We define these varables at
;;compile-time to make the compiler happy.
(eval-when-compile
  (dolist (x '(row col))
    (make-local-variable x)
    (set x nil)))

(defun ses-center (value &optional span fill)
  "Print VALUE, centered within column.  FILL is the fill character for
centering (default = space).  SPAN indicates how many additional rightward
columns to include in width (default = 0)."
  (let ((printer (or (ses-col-printer col) ses--default-printer))
	(width   (ses-col-width col))
	half)
    (or fill (setq fill ?\s))
    (or span (setq span 0))
    (setq value (ses-call-printer printer value))
    (dotimes (x span)
      (setq width (+ width 1 (ses-col-width (+ col span (- x))))))
    (setq width (- width (length value)))
    (if (<= width 0)
	value ;Too large for field, anyway
      (setq half (make-string (/ width 2) fill))
      (concat half value half
	      (if (> (% width 2) 0) (char-to-string fill))))))

(defun ses-center-span (value &optional fill)
  "Print VALUE, centered within the span that starts in the current column
and continues until the next nonblank column.  FILL specifies the fill
character (default = space)."
  (let ((end (1+ col)))
    (while (and (< end ses--numcols)
		(memq (ses-cell-value row end) '(nil *skip*)))
      (setq end (1+ end)))
    (ses-center value (- end col 1) fill)))

(defun ses-dashfill (value &optional span)
  "Print VALUE centered using dashes.  SPAN indicates how many rightward
columns to include in width (default = 0)."
  (ses-center value span ?-))

(defun ses-dashfill-span (value)
  "Print VALUE, centered using dashes within the span that starts in the
current column and continues until the next nonblank column."
  (ses-center-span value ?-))

(defun ses-tildefill-span (value)
  "Print VALUE, centered using tildes within the span that starts in the
current column and continues until the next nonblank column."
  (ses-center-span value ?~))

(defun ses-unsafe (value)
  "Substitute for an unsafe formula or printer"
  (error "Unsafe formula or printer"))

;;All standard printers are safe, including ses-unsafe!
(dolist (x (cons 'ses-unsafe ses-standard-printer-functions))
  (put x 'side-effect-free t))

(provide 'ses)

;; arch-tag: 88c1ccf0-4293-4824-8c5d-0757b52217f3
;;; ses.el ends here