distribute / pkg_resources.py

The branch 'default' does not exist.
   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
"""Package resource API
--------------------

A resource is a logical file contained within a package, or a logical
subdirectory thereof.  The package resource API expects resource names
to have their path parts separated with ``/``, *not* whatever the local
path separator is.  Do not use os.path operations to manipulate resource
names being passed into the API.

The package resource API is designed to work with normal filesystem packages,
.egg files, and unpacked .egg files.  It can also work in a limited way with
.zip files and with custom PEP 302 loaders that support the ``get_data()``
method.
"""

import sys, os, zipimport, time, re, imp, types
from urlparse import urlparse, urlunparse

try:
    frozenset
except NameError:
    from sets import ImmutableSet as frozenset

# capture these to bypass sandboxing
from os import utime
try:
    from os import mkdir, rename, unlink
    WRITE_SUPPORT = True
except ImportError:
    # no write support, probably under GAE
    WRITE_SUPPORT = False

from os import open as os_open
from os.path import isdir, split

# Avoid try/except due to potential problems with delayed import mechanisms.
if sys.version_info >= (3, 3) and sys.implementation.name == "cpython":
    import importlib._bootstrap as importlib_bootstrap
else:
    importlib_bootstrap = None

# This marker is used to simplify the process that checks is the
# setuptools package was installed by the Setuptools project
# or by the Distribute project, in case Setuptools creates
# a distribution with the same version.
#
# The bootstrapping script for instance, will check if this
# attribute is present to decide wether to reinstall the package
_distribute = True

def _bypass_ensure_directory(name, mode=0777):
    # Sandbox-bypassing version of ensure_directory()
    if not WRITE_SUPPORT:
        raise IOError('"os.mkdir" not supported on this platform.')
    dirname, filename = split(name)
    if dirname and filename and not isdir(dirname):
        _bypass_ensure_directory(dirname)
        mkdir(dirname, mode)


_state_vars = {}

def _declare_state(vartype, **kw):
    g = globals()
    for name, val in kw.iteritems():
        g[name] = val
        _state_vars[name] = vartype

def __getstate__():
    state = {}
    g = globals()
    for k, v in _state_vars.iteritems():
        state[k] = g['_sget_'+v](g[k])
    return state

def __setstate__(state):
    g = globals()
    for k, v in state.iteritems():
        g['_sset_'+_state_vars[k]](k, g[k], v)
    return state

def _sget_dict(val):
    return val.copy()

def _sset_dict(key, ob, state):
    ob.clear()
    ob.update(state)

def _sget_object(val):
    return val.__getstate__()

def _sset_object(key, ob, state):
    ob.__setstate__(state)

_sget_none = _sset_none = lambda *args: None



def get_supported_platform():
    """Return this platform's maximum compatible version.

    distutils.util.get_platform() normally reports the minimum version
    of Mac OS X that would be required to *use* extensions produced by
    distutils.  But what we want when checking compatibility is to know the
    version of Mac OS X that we are *running*.  To allow usage of packages that
    explicitly require a newer version of Mac OS X, we must also know the
    current version of the OS.

    If this condition occurs for any other platform with a version in its
    platform strings, this function should be extended accordingly.
    """
    plat = get_build_platform(); m = macosVersionString.match(plat)
    if m is not None and sys.platform == "darwin":
        try:
            plat = 'macosx-%s-%s' % ('.'.join(_macosx_vers()[:2]), m.group(3))
        except ValueError:
            pass    # not Mac OS X
    return plat





















__all__ = [
    # Basic resource access and distribution/entry point discovery
    'require', 'run_script', 'get_provider',  'get_distribution',
    'load_entry_point', 'get_entry_map', 'get_entry_info', 'iter_entry_points',
    'resource_string', 'resource_stream', 'resource_filename',
    'resource_listdir', 'resource_exists', 'resource_isdir',

    # Environmental control
    'declare_namespace', 'working_set', 'add_activation_listener',
    'find_distributions', 'set_extraction_path', 'cleanup_resources',
    'get_default_cache',

    # Primary implementation classes
    'Environment', 'WorkingSet', 'ResourceManager',
    'Distribution', 'Requirement', 'EntryPoint',

    # Exceptions
    'ResolutionError','VersionConflict','DistributionNotFound','UnknownExtra',
    'ExtractionError',

    # Parsing functions and string utilities
    'parse_requirements', 'parse_version', 'safe_name', 'safe_version',
    'get_platform', 'compatible_platforms', 'yield_lines', 'split_sections',
    'safe_extra', 'to_filename',

    # filesystem utilities
    'ensure_directory', 'normalize_path',

    # Distribution "precedence" constants
    'EGG_DIST', 'BINARY_DIST', 'SOURCE_DIST', 'CHECKOUT_DIST', 'DEVELOP_DIST',

    # "Provider" interfaces, implementations, and registration/lookup APIs
    'IMetadataProvider', 'IResourceProvider', 'FileMetadata',
    'PathMetadata', 'EggMetadata', 'EmptyProvider', 'empty_provider',
    'NullProvider', 'EggProvider', 'DefaultProvider', 'ZipProvider',
    'register_finder', 'register_namespace_handler', 'register_loader_type',
    'fixup_namespace_packages', 'get_importer',

    # Deprecated/backward compatibility only
    'run_main', 'AvailableDistributions',
]
class ResolutionError(Exception):
    """Abstract base for dependency resolution errors"""
    def __repr__(self):
        return self.__class__.__name__+repr(self.args)

class VersionConflict(ResolutionError):
    """An already-installed version conflicts with the requested version"""

class DistributionNotFound(ResolutionError):
    """A requested distribution was not found"""

class UnknownExtra(ResolutionError):
    """Distribution doesn't have an "extra feature" of the given name"""
_provider_factories = {}

PY_MAJOR = sys.version[:3]
EGG_DIST    = 3
BINARY_DIST = 2
SOURCE_DIST = 1
CHECKOUT_DIST = 0
DEVELOP_DIST = -1

def register_loader_type(loader_type, provider_factory):
    """Register `provider_factory` to make providers for `loader_type`

    `loader_type` is the type or class of a PEP 302 ``module.__loader__``,
    and `provider_factory` is a function that, passed a *module* object,
    returns an ``IResourceProvider`` for that module.
    """
    _provider_factories[loader_type] = provider_factory

def get_provider(moduleOrReq):
    """Return an IResourceProvider for the named module or requirement"""
    if isinstance(moduleOrReq,Requirement):
        return working_set.find(moduleOrReq) or require(str(moduleOrReq))[0]
    try:
        module = sys.modules[moduleOrReq]
    except KeyError:
        __import__(moduleOrReq)
        module = sys.modules[moduleOrReq]
    loader = getattr(module, '__loader__', None)
    return _find_adapter(_provider_factories, loader)(module)

def _macosx_vers(_cache=[]):
    if not _cache:
        import platform
        version = platform.mac_ver()[0]
        # fallback for MacPorts
        if version == '':
            import plistlib
            plist = '/System/Library/CoreServices/SystemVersion.plist'
            if os.path.exists(plist):
                if hasattr(plistlib, 'readPlist'):
                    plist_content = plistlib.readPlist(plist)
                    if 'ProductVersion' in plist_content:
                        version = plist_content['ProductVersion']

        _cache.append(version.split('.'))
    return _cache[0]

def _macosx_arch(machine):
    return {'PowerPC':'ppc', 'Power_Macintosh':'ppc'}.get(machine,machine)

def get_build_platform():
    """Return this platform's string for platform-specific distributions

    XXX Currently this is the same as ``distutils.util.get_platform()``, but it
    needs some hacks for Linux and Mac OS X.
    """
    try:
        from distutils.util import get_platform
    except ImportError:
        from sysconfig import get_platform

    plat = get_platform()
    if sys.platform == "darwin" and not plat.startswith('macosx-'):
        try:
            version = _macosx_vers()
            machine = os.uname()[4].replace(" ", "_")
            return "macosx-%d.%d-%s" % (int(version[0]), int(version[1]),
                _macosx_arch(machine))
        except ValueError:
            # if someone is running a non-Mac darwin system, this will fall
            # through to the default implementation
            pass
    return plat

macosVersionString = re.compile(r"macosx-(\d+)\.(\d+)-(.*)")
darwinVersionString = re.compile(r"darwin-(\d+)\.(\d+)\.(\d+)-(.*)")
get_platform = get_build_platform   # XXX backward compat

def compatible_platforms(provided,required):
    """Can code for the `provided` platform run on the `required` platform?

    Returns true if either platform is ``None``, or the platforms are equal.

    XXX Needs compatibility checks for Linux and other unixy OSes.
    """
    if provided is None or required is None or provided==required:
        return True     # easy case

    # Mac OS X special cases
    reqMac = macosVersionString.match(required)
    if reqMac:
        provMac = macosVersionString.match(provided)

        # is this a Mac package?
        if not provMac:
            # this is backwards compatibility for packages built before
            # setuptools 0.6. All packages built after this point will
            # use the new macosx designation.
            provDarwin = darwinVersionString.match(provided)
            if provDarwin:
                dversion = int(provDarwin.group(1))
                macosversion = "%s.%s" % (reqMac.group(1), reqMac.group(2))
                if dversion == 7 and macosversion >= "10.3" or \
                    dversion == 8 and macosversion >= "10.4":

                    #import warnings
                    #warnings.warn("Mac eggs should be rebuilt to "
                    #    "use the macosx designation instead of darwin.",
                    #    category=DeprecationWarning)
                    return True
            return False    # egg isn't macosx or legacy darwin

        # are they the same major version and machine type?
        if provMac.group(1) != reqMac.group(1) or \
            provMac.group(3) != reqMac.group(3):
            return False



        # is the required OS major update >= the provided one?
        if int(provMac.group(2)) > int(reqMac.group(2)):
            return False

        return True

    # XXX Linux and other platforms' special cases should go here
    return False


def run_script(dist_spec, script_name):
    """Locate distribution `dist_spec` and run its `script_name` script"""
    ns = sys._getframe(1).f_globals
    name = ns['__name__']
    ns.clear()
    ns['__name__'] = name
    require(dist_spec)[0].run_script(script_name, ns)

run_main = run_script   # backward compatibility

def get_distribution(dist):
    """Return a current distribution object for a Requirement or string"""
    if isinstance(dist,basestring): dist = Requirement.parse(dist)
    if isinstance(dist,Requirement): dist = get_provider(dist)
    if not isinstance(dist,Distribution):
        raise TypeError("Expected string, Requirement, or Distribution", dist)
    return dist

def load_entry_point(dist, group, name):
    """Return `name` entry point of `group` for `dist` or raise ImportError"""
    return get_distribution(dist).load_entry_point(group, name)

def get_entry_map(dist, group=None):
    """Return the entry point map for `group`, or the full entry map"""
    return get_distribution(dist).get_entry_map(group)

def get_entry_info(dist, group, name):
    """Return the EntryPoint object for `group`+`name`, or ``None``"""
    return get_distribution(dist).get_entry_info(group, name)


class IMetadataProvider:

    def has_metadata(name):
        """Does the package's distribution contain the named metadata?"""

    def get_metadata(name):
        """The named metadata resource as a string"""

    def get_metadata_lines(name):
        """Yield named metadata resource as list of non-blank non-comment lines

       Leading and trailing whitespace is stripped from each line, and lines
       with ``#`` as the first non-blank character are omitted."""

    def metadata_isdir(name):
        """Is the named metadata a directory?  (like ``os.path.isdir()``)"""

    def metadata_listdir(name):
        """List of metadata names in the directory (like ``os.listdir()``)"""

    def run_script(script_name, namespace):
        """Execute the named script in the supplied namespace dictionary"""










class IResourceProvider(IMetadataProvider):
    """An object that provides access to package resources"""

    def get_resource_filename(manager, resource_name):
        """Return a true filesystem path for `resource_name`

        `manager` must be an ``IResourceManager``"""

    def get_resource_stream(manager, resource_name):
        """Return a readable file-like object for `resource_name`

        `manager` must be an ``IResourceManager``"""

    def get_resource_string(manager, resource_name):
        """Return a string containing the contents of `resource_name`

        `manager` must be an ``IResourceManager``"""

    def has_resource(resource_name):
        """Does the package contain the named resource?"""

    def resource_isdir(resource_name):
        """Is the named resource a directory?  (like ``os.path.isdir()``)"""

    def resource_listdir(resource_name):
        """List of resource names in the directory (like ``os.listdir()``)"""















class WorkingSet(object):
    """A collection of active distributions on sys.path (or a similar list)"""

    def __init__(self, entries=None):
        """Create working set from list of path entries (default=sys.path)"""
        self.entries = []
        self.entry_keys = {}
        self.by_key = {}
        self.callbacks = []

        if entries is None:
            entries = sys.path

        for entry in entries:
            self.add_entry(entry)


    def add_entry(self, entry):
        """Add a path item to ``.entries``, finding any distributions on it

        ``find_distributions(entry,True)`` is used to find distributions
        corresponding to the path entry, and they are added.  `entry` is
        always appended to ``.entries``, even if it is already present.
        (This is because ``sys.path`` can contain the same value more than
        once, and the ``.entries`` of the ``sys.path`` WorkingSet should always
        equal ``sys.path``.)
        """
        self.entry_keys.setdefault(entry, [])
        self.entries.append(entry)
        for dist in find_distributions(entry, True):
            self.add(dist, entry, False)


    def __contains__(self,dist):
        """True if `dist` is the active distribution for its project"""
        return self.by_key.get(dist.key) == dist





    def find(self, req):
        """Find a distribution matching requirement `req`

        If there is an active distribution for the requested project, this
        returns it as long as it meets the version requirement specified by
        `req`.  But, if there is an active distribution for the project and it
        does *not* meet the `req` requirement, ``VersionConflict`` is raised.
        If there is no active distribution for the requested project, ``None``
        is returned.
        """
        dist = self.by_key.get(req.key)
        if dist is not None and dist not in req:
            raise VersionConflict(dist,req)     # XXX add more info
        else:
            return dist

    def iter_entry_points(self, group, name=None):
        """Yield entry point objects from `group` matching `name`

        If `name` is None, yields all entry points in `group` from all
        distributions in the working set, otherwise only ones matching
        both `group` and `name` are yielded (in distribution order).
        """
        for dist in self:
            entries = dist.get_entry_map(group)
            if name is None:
                for ep in entries.values():
                    yield ep
            elif name in entries:
                yield entries[name]

    def run_script(self, requires, script_name):
        """Locate distribution for `requires` and run `script_name` script"""
        ns = sys._getframe(1).f_globals
        name = ns['__name__']
        ns.clear()
        ns['__name__'] = name
        self.require(requires)[0].run_script(script_name, ns)



    def __iter__(self):
        """Yield distributions for non-duplicate projects in the working set

        The yield order is the order in which the items' path entries were
        added to the working set.
        """
        seen = {}
        for item in self.entries:
            if item not in self.entry_keys:
                # workaround a cache issue
                continue

            for key in self.entry_keys[item]:
                if key not in seen:
                    seen[key]=1
                    yield self.by_key[key]

    def add(self, dist, entry=None, insert=True):
        """Add `dist` to working set, associated with `entry`

        If `entry` is unspecified, it defaults to the ``.location`` of `dist`.
        On exit from this routine, `entry` is added to the end of the working
        set's ``.entries`` (if it wasn't already present).

        `dist` is only added to the working set if it's for a project that
        doesn't already have a distribution in the set.  If it's added, any
        callbacks registered with the ``subscribe()`` method will be called.
        """
        if insert:
            dist.insert_on(self.entries, entry)

        if entry is None:
            entry = dist.location
        keys = self.entry_keys.setdefault(entry,[])
        keys2 = self.entry_keys.setdefault(dist.location,[])
        if dist.key in self.by_key:
            return      # ignore hidden distros

        self.by_key[dist.key] = dist
        if dist.key not in keys:
            keys.append(dist.key)
        if dist.key not in keys2:
            keys2.append(dist.key)
        self._added_new(dist)

    def resolve(self, requirements, env=None, installer=None, replacement=True):
        """List all distributions needed to (recursively) meet `requirements`

        `requirements` must be a sequence of ``Requirement`` objects.  `env`,
        if supplied, should be an ``Environment`` instance.  If
        not supplied, it defaults to all distributions available within any
        entry or distribution in the working set.  `installer`, if supplied,
        will be invoked with each requirement that cannot be met by an
        already-installed distribution; it should return a ``Distribution`` or
        ``None``.
        """

        requirements = list(requirements)[::-1]  # set up the stack
        processed = {}  # set of processed requirements
        best = {}  # key -> dist
        to_activate = []

        while requirements:
            req = requirements.pop(0)   # process dependencies breadth-first
            if _override_setuptools(req) and replacement:
                req = Requirement.parse('distribute')

            if req in processed:
                # Ignore cyclic or redundant dependencies
                continue
            dist = best.get(req.key)
            if dist is None:
                # Find the best distribution and add it to the map
                dist = self.by_key.get(req.key)
                if dist is None:
                    if env is None:
                        env = Environment(self.entries)
                    dist = best[req.key] = env.best_match(req, self, installer)
                    if dist is None:
                        #msg = ("The '%s' distribution was not found on this "
                        #       "system, and is required by this application.")
                        #raise DistributionNotFound(msg % req)

                        # unfortunately, zc.buildout uses a str(err)
                        # to get the name of the distribution here..
                        raise DistributionNotFound(req)
                to_activate.append(dist)
            if dist not in req:
                # Oops, the "best" so far conflicts with a dependency
                raise VersionConflict(dist,req) # XXX put more info here
            requirements.extend(dist.requires(req.extras)[::-1])
            processed[req] = True

        return to_activate    # return list of distros to activate

    def find_plugins(self,
        plugin_env, full_env=None, installer=None, fallback=True
    ):
        """Find all activatable distributions in `plugin_env`

        Example usage::

            distributions, errors = working_set.find_plugins(
                Environment(plugin_dirlist)
            )
            map(working_set.add, distributions)  # add plugins+libs to sys.path
            print 'Could not load', errors        # display errors

        The `plugin_env` should be an ``Environment`` instance that contains
        only distributions that are in the project's "plugin directory" or
        directories. The `full_env`, if supplied, should be an ``Environment``
        contains all currently-available distributions.  If `full_env` is not
        supplied, one is created automatically from the ``WorkingSet`` this
        method is called on, which will typically mean that every directory on
        ``sys.path`` will be scanned for distributions.

        `installer` is a standard installer callback as used by the
        ``resolve()`` method. The `fallback` flag indicates whether we should
        attempt to resolve older versions of a plugin if the newest version
        cannot be resolved.

        This method returns a 2-tuple: (`distributions`, `error_info`), where
        `distributions` is a list of the distributions found in `plugin_env`
        that were loadable, along with any other distributions that are needed
        to resolve their dependencies.  `error_info` is a dictionary mapping
        unloadable plugin distributions to an exception instance describing the
        error that occurred. Usually this will be a ``DistributionNotFound`` or
        ``VersionConflict`` instance.
        """

        plugin_projects = list(plugin_env)
        plugin_projects.sort()  # scan project names in alphabetic order

        error_info = {}
        distributions = {}

        if full_env is None:
            env = Environment(self.entries)
            env += plugin_env
        else:
            env = full_env + plugin_env

        shadow_set = self.__class__([])
        map(shadow_set.add, self)   # put all our entries in shadow_set

        for project_name in plugin_projects:

            for dist in plugin_env[project_name]:

                req = [dist.as_requirement()]

                try:
                    resolvees = shadow_set.resolve(req, env, installer)

                except ResolutionError,v:
                    error_info[dist] = v    # save error info
                    if fallback:
                        continue    # try the next older version of project
                    else:
                        break       # give up on this project, keep going

                else:
                    map(shadow_set.add, resolvees)
                    distributions.update(dict.fromkeys(resolvees))

                    # success, no need to try any more versions of this project
                    break

        distributions = list(distributions)
        distributions.sort()

        return distributions, error_info





    def require(self, *requirements):
        """Ensure that distributions matching `requirements` are activated

        `requirements` must be a string or a (possibly-nested) sequence
        thereof, specifying the distributions and versions required.  The
        return value is a sequence of the distributions that needed to be
        activated to fulfill the requirements; all relevant distributions are
        included, even if they were already activated in this working set.
        """

        needed = self.resolve(parse_requirements(requirements))

        for dist in needed:
            self.add(dist)

        return needed


    def subscribe(self, callback):
        """Invoke `callback` for all distributions (including existing ones)"""
        if callback in self.callbacks:
            return
        self.callbacks.append(callback)
        for dist in self:
            callback(dist)


    def _added_new(self, dist):
        for callback in self.callbacks:
            callback(dist)

    def __getstate__(self):
        return (self.entries[:], self.entry_keys.copy(), self.by_key.copy(),
                self.callbacks[:])

    def __setstate__(self, (entries, keys, by_key, callbacks)):
        self.entries = entries[:]
        self.entry_keys = keys.copy()
        self.by_key = by_key.copy()
        self.callbacks = callbacks[:]




class Environment(object):
    """Searchable snapshot of distributions on a search path"""

    def __init__(self, search_path=None, platform=get_supported_platform(), python=PY_MAJOR):
        """Snapshot distributions available on a search path

        Any distributions found on `search_path` are added to the environment.
        `search_path` should be a sequence of ``sys.path`` items.  If not
        supplied, ``sys.path`` is used.

        `platform` is an optional string specifying the name of the platform
        that platform-specific distributions must be compatible with.  If
        unspecified, it defaults to the current platform.  `python` is an
        optional string naming the desired version of Python (e.g. ``'2.4'``);
        it defaults to the current version.

        You may explicitly set `platform` (and/or `python`) to ``None`` if you
        wish to map *all* distributions, not just those compatible with the
        running platform or Python version.
        """
        self._distmap = {}
        self._cache = {}
        self.platform = platform
        self.python = python
        self.scan(search_path)

    def can_add(self, dist):
        """Is distribution `dist` acceptable for this environment?

        The distribution must match the platform and python version
        requirements specified when this environment was created, or False
        is returned.
        """
        return (self.python is None or dist.py_version is None
            or dist.py_version==self.python) \
           and compatible_platforms(dist.platform,self.platform)

    def remove(self, dist):
        """Remove `dist` from the environment"""
        self._distmap[dist.key].remove(dist)

    def scan(self, search_path=None):
        """Scan `search_path` for distributions usable in this environment

        Any distributions found are added to the environment.
        `search_path` should be a sequence of ``sys.path`` items.  If not
        supplied, ``sys.path`` is used.  Only distributions conforming to
        the platform/python version defined at initialization are added.
        """
        if search_path is None:
            search_path = sys.path

        for item in search_path:
            for dist in find_distributions(item):
                self.add(dist)

    def __getitem__(self,project_name):
        """Return a newest-to-oldest list of distributions for `project_name`
        """
        try:
            return self._cache[project_name]
        except KeyError:
            project_name = project_name.lower()
            if project_name not in self._distmap:
                return []

        if project_name not in self._cache:
            dists = self._cache[project_name] = self._distmap[project_name]
            _sort_dists(dists)

        return self._cache[project_name]

    def add(self,dist):
        """Add `dist` if we ``can_add()`` it and it isn't already added"""
        if self.can_add(dist) and dist.has_version():
            dists = self._distmap.setdefault(dist.key,[])
            if dist not in dists:
                dists.append(dist)
                if dist.key in self._cache:
                    _sort_dists(self._cache[dist.key])


    def best_match(self, req, working_set, installer=None):
        """Find distribution best matching `req` and usable on `working_set`

        This calls the ``find(req)`` method of the `working_set` to see if a
        suitable distribution is already active.  (This may raise
        ``VersionConflict`` if an unsuitable version of the project is already
        active in the specified `working_set`.)  If a suitable distribution
        isn't active, this method returns the newest distribution in the
        environment that meets the ``Requirement`` in `req`.  If no suitable
        distribution is found, and `installer` is supplied, then the result of
        calling the environment's ``obtain(req, installer)`` method will be
        returned.
        """
        dist = working_set.find(req)
        if dist is not None:
            return dist
        for dist in self[req.key]:
            if dist in req:
                return dist
        return self.obtain(req, installer) # try and download/install

    def obtain(self, requirement, installer=None):
        """Obtain a distribution matching `requirement` (e.g. via download)

        Obtain a distro that matches requirement (e.g. via download).  In the
        base ``Environment`` class, this routine just returns
        ``installer(requirement)``, unless `installer` is None, in which case
        None is returned instead.  This method is a hook that allows subclasses
        to attempt other ways of obtaining a distribution before falling back
        to the `installer` argument."""
        if installer is not None:
            return installer(requirement)

    def __iter__(self):
        """Yield the unique project names of the available distributions"""
        for key in self._distmap.keys():
            if self[key]: yield key




    def __iadd__(self, other):
        """In-place addition of a distribution or environment"""
        if isinstance(other,Distribution):
            self.add(other)
        elif isinstance(other,Environment):
            for project in other:
                for dist in other[project]:
                    self.add(dist)
        else:
            raise TypeError("Can't add %r to environment" % (other,))
        return self

    def __add__(self, other):
        """Add an environment or distribution to an environment"""
        new = self.__class__([], platform=None, python=None)
        for env in self, other:
            new += env
        return new


AvailableDistributions = Environment    # XXX backward compatibility


class ExtractionError(RuntimeError):
    """An error occurred extracting a resource

    The following attributes are available from instances of this exception:

    manager
        The resource manager that raised this exception

    cache_path
        The base directory for resource extraction

    original_error
        The exception instance that caused extraction to fail
    """




class ResourceManager:
    """Manage resource extraction and packages"""
    extraction_path = None

    def __init__(self):
        self.cached_files = {}

    def resource_exists(self, package_or_requirement, resource_name):
        """Does the named resource exist?"""
        return get_provider(package_or_requirement).has_resource(resource_name)

    def resource_isdir(self, package_or_requirement, resource_name):
        """Is the named resource an existing directory?"""
        return get_provider(package_or_requirement).resource_isdir(
            resource_name
        )

    def resource_filename(self, package_or_requirement, resource_name):
        """Return a true filesystem path for specified resource"""
        return get_provider(package_or_requirement).get_resource_filename(
            self, resource_name
        )

    def resource_stream(self, package_or_requirement, resource_name):
        """Return a readable file-like object for specified resource"""
        return get_provider(package_or_requirement).get_resource_stream(
            self, resource_name
        )

    def resource_string(self, package_or_requirement, resource_name):
        """Return specified resource as a string"""
        return get_provider(package_or_requirement).get_resource_string(
            self, resource_name
        )

    def resource_listdir(self, package_or_requirement, resource_name):
        """List the contents of the named resource directory"""
        return get_provider(package_or_requirement).resource_listdir(
            resource_name
        )

    def extraction_error(self):
        """Give an error message for problems extracting file(s)"""

        old_exc = sys.exc_info()[1]
        cache_path = self.extraction_path or get_default_cache()

        err = ExtractionError("""Can't extract file(s) to egg cache

The following error occurred while trying to extract file(s) to the Python egg
cache:

  %s

The Python egg cache directory is currently set to:

  %s

Perhaps your account does not have write access to this directory?  You can
change the cache directory by setting the PYTHON_EGG_CACHE environment
variable to point to an accessible directory.
"""         % (old_exc, cache_path)
        )
        err.manager        = self
        err.cache_path     = cache_path
        err.original_error = old_exc
        raise err















    def get_cache_path(self, archive_name, names=()):
        """Return absolute location in cache for `archive_name` and `names`

        The parent directory of the resulting path will be created if it does
        not already exist.  `archive_name` should be the base filename of the
        enclosing egg (which may not be the name of the enclosing zipfile!),
        including its ".egg" extension.  `names`, if provided, should be a
        sequence of path name parts "under" the egg's extraction location.

        This method should only be called by resource providers that need to
        obtain an extraction location, and only for names they intend to
        extract, as it tracks the generated names for possible cleanup later.
        """
        extract_path = self.extraction_path or get_default_cache()
        target_path = os.path.join(extract_path, archive_name+'-tmp', *names)
        try:
            _bypass_ensure_directory(target_path)
        except:
            self.extraction_error()

        self.cached_files[target_path] = 1
        return target_path



















    def postprocess(self, tempname, filename):
        """Perform any platform-specific postprocessing of `tempname`

        This is where Mac header rewrites should be done; other platforms don't
        have anything special they should do.

        Resource providers should call this method ONLY after successfully
        extracting a compressed resource.  They must NOT call it on resources
        that are already in the filesystem.

        `tempname` is the current (temporary) name of the file, and `filename`
        is the name it will be renamed to by the caller after this routine
        returns.
        """

        if os.name == 'posix':
            # Make the resource executable
            mode = ((os.stat(tempname).st_mode) | 0555) & 07777
            os.chmod(tempname, mode)






















    def set_extraction_path(self, path):
        """Set the base path where resources will be extracted to, if needed.

        If you do not call this routine before any extractions take place, the
        path defaults to the return value of ``get_default_cache()``.  (Which
        is based on the ``PYTHON_EGG_CACHE`` environment variable, with various
        platform-specific fallbacks.  See that routine's documentation for more
        details.)

        Resources are extracted to subdirectories of this path based upon
        information given by the ``IResourceProvider``.  You may set this to a
        temporary directory, but then you must call ``cleanup_resources()`` to
        delete the extracted files when done.  There is no guarantee that
        ``cleanup_resources()`` will be able to remove all extracted files.

        (Note: you may not change the extraction path for a given resource
        manager once resources have been extracted, unless you first call
        ``cleanup_resources()``.)
        """
        if self.cached_files:
            raise ValueError(
                "Can't change extraction path, files already extracted"
            )

        self.extraction_path = path

    def cleanup_resources(self, force=False):
        """
        Delete all extracted resource files and directories, returning a list
        of the file and directory names that could not be successfully removed.
        This function does not have any concurrency protection, so it should
        generally only be called when the extraction path is a temporary
        directory exclusive to a single process.  This method is not
        automatically called; you must call it explicitly or register it as an
        ``atexit`` function if you wish to ensure cleanup of a temporary
        directory used for extractions.
        """
        # XXX



def get_default_cache():
    """Determine the default cache location

    This returns the ``PYTHON_EGG_CACHE`` environment variable, if set.
    Otherwise, on Windows, it returns a "Python-Eggs" subdirectory of the
    "Application Data" directory.  On all other systems, it's "~/.python-eggs".
    """
    try:
        return os.environ['PYTHON_EGG_CACHE']
    except KeyError:
        pass

    if os.name!='nt':
        return os.path.expanduser('~/.python-eggs')

    app_data = 'Application Data'   # XXX this may be locale-specific!
    app_homes = [
        (('APPDATA',), None),       # best option, should be locale-safe
        (('USERPROFILE',), app_data),
        (('HOMEDRIVE','HOMEPATH'), app_data),
        (('HOMEPATH',), app_data),
        (('HOME',), None),
        (('WINDIR',), app_data),    # 95/98/ME
    ]

    for keys, subdir in app_homes:
        dirname = ''
        for key in keys:
            if key in os.environ:
                dirname = os.path.join(dirname, os.environ[key])
            else:
                break
        else:
            if subdir:
                dirname = os.path.join(dirname,subdir)
            return os.path.join(dirname, 'Python-Eggs')
    else:
        raise RuntimeError(
            "Please set the PYTHON_EGG_CACHE enviroment variable"
        )

def safe_name(name):
    """Convert an arbitrary string to a standard distribution name

    Any runs of non-alphanumeric/. characters are replaced with a single '-'.
    """
    return re.sub('[^A-Za-z0-9.]+', '-', name)


def safe_version(version):
    """Convert an arbitrary string to a standard version string

    Spaces become dots, and all other non-alphanumeric characters become
    dashes, with runs of multiple dashes condensed to a single dash.
    """
    version = version.replace(' ','.')
    return re.sub('[^A-Za-z0-9.]+', '-', version)


def safe_extra(extra):
    """Convert an arbitrary string to a standard 'extra' name

    Any runs of non-alphanumeric characters are replaced with a single '_',
    and the result is always lowercased.
    """
    return re.sub('[^A-Za-z0-9.]+', '_', extra).lower()


def to_filename(name):
    """Convert a project or version name to its filename-escaped form

    Any '-' characters are currently replaced with '_'.
    """
    return name.replace('-','_')








class NullProvider:
    """Try to implement resources and metadata for arbitrary PEP 302 loaders"""

    egg_name = None
    egg_info = None
    loader = None

    def __init__(self, module):
        self.loader = getattr(module, '__loader__', None)
        self.module_path = os.path.dirname(getattr(module, '__file__', ''))

    def get_resource_filename(self, manager, resource_name):
        return self._fn(self.module_path, resource_name)

    def get_resource_stream(self, manager, resource_name):
        return StringIO(self.get_resource_string(manager, resource_name))

    def get_resource_string(self, manager, resource_name):
        return self._get(self._fn(self.module_path, resource_name))

    def has_resource(self, resource_name):
        return self._has(self._fn(self.module_path, resource_name))

    def has_metadata(self, name):
        return self.egg_info and self._has(self._fn(self.egg_info,name))

    if sys.version_info <= (3,):
        def get_metadata(self, name):
            if not self.egg_info:
                return ""
            return self._get(self._fn(self.egg_info,name))
    else:
        def get_metadata(self, name):
            if not self.egg_info:
                return ""
            return self._get(self._fn(self.egg_info,name)).decode("utf-8")

    def get_metadata_lines(self, name):
        return yield_lines(self.get_metadata(name))

    def resource_isdir(self,resource_name):
        return self._isdir(self._fn(self.module_path, resource_name))

    def metadata_isdir(self,name):
        return self.egg_info and self._isdir(self._fn(self.egg_info,name))


    def resource_listdir(self,resource_name):
        return self._listdir(self._fn(self.module_path,resource_name))

    def metadata_listdir(self,name):
        if self.egg_info:
            return self._listdir(self._fn(self.egg_info,name))
        return []

    def run_script(self,script_name,namespace):
        script = 'scripts/'+script_name
        if not self.has_metadata(script):
            raise ResolutionError("No script named %r" % script_name)
        script_text = self.get_metadata(script).replace('\r\n','\n')
        script_text = script_text.replace('\r','\n')
        script_filename = self._fn(self.egg_info,script)
        namespace['__file__'] = script_filename
        if os.path.exists(script_filename):
            execfile(script_filename, namespace, namespace)
        else:
            from linecache import cache
            cache[script_filename] = (
                len(script_text), 0, script_text.split('\n'), script_filename
            )
            script_code = compile(script_text,script_filename,'exec')
            exec script_code in namespace, namespace

    def _has(self, path):
        raise NotImplementedError(
            "Can't perform this operation for unregistered loader type"
        )

    def _isdir(self, path):
        raise NotImplementedError(
            "Can't perform this operation for unregistered loader type"
        )

    def _listdir(self, path):
        raise NotImplementedError(
            "Can't perform this operation for unregistered loader type"
        )

    def _fn(self, base, resource_name):
        if resource_name:
            return os.path.join(base, *resource_name.split('/'))
        return base

    def _get(self, path):
        if hasattr(self.loader, 'get_data'):
            return self.loader.get_data(path)
        raise NotImplementedError(
            "Can't perform this operation for loaders without 'get_data()'"
        )

register_loader_type(object, NullProvider)


class EggProvider(NullProvider):
    """Provider based on a virtual filesystem"""

    def __init__(self,module):
        NullProvider.__init__(self,module)
        self._setup_prefix()

    def _setup_prefix(self):
        # we assume here that our metadata may be nested inside a "basket"
        # of multiple eggs; that's why we use module_path instead of .archive
        path = self.module_path
        old = None
        while path!=old:
            if path.lower().endswith('.egg'):
                self.egg_name = os.path.basename(path)
                self.egg_info = os.path.join(path, 'EGG-INFO')
                self.egg_root = path
                break
            old = path
            path, base = os.path.split(path)






class DefaultProvider(EggProvider):
    """Provides access to package resources in the filesystem"""

    def _has(self, path):
        return os.path.exists(path)

    def _isdir(self,path):
        return os.path.isdir(path)

    def _listdir(self,path):
        return os.listdir(path)

    def get_resource_stream(self, manager, resource_name):
        return open(self._fn(self.module_path, resource_name), 'rb')

    def _get(self, path):
        stream = open(path, 'rb')
        try:
            return stream.read()
        finally:
            stream.close()

register_loader_type(type(None), DefaultProvider)

if importlib_bootstrap is not None:
    register_loader_type(importlib_bootstrap.SourceFileLoader, DefaultProvider)


class EmptyProvider(NullProvider):
    """Provider that returns nothing for all requests"""

    _isdir = _has = lambda self,path: False
    _get          = lambda self,path: ''
    _listdir      = lambda self,path: []
    module_path   = None

    def __init__(self):
        pass

empty_provider = EmptyProvider()




class ZipProvider(EggProvider):
    """Resource support for zips and eggs"""

    eagers = None

    def __init__(self, module):
        EggProvider.__init__(self,module)
        self.zipinfo = zipimport._zip_directory_cache[self.loader.archive]
        self.zip_pre = self.loader.archive+os.sep

    def _zipinfo_name(self, fspath):
        # Convert a virtual filename (full path to file) into a zipfile subpath
        # usable with the zipimport directory cache for our target archive
        if fspath.startswith(self.zip_pre):
            return fspath[len(self.zip_pre):]
        raise AssertionError(
            "%s is not a subpath of %s" % (fspath,self.zip_pre)
        )

    def _parts(self,zip_path):
        # Convert a zipfile subpath into an egg-relative path part list
        fspath = self.zip_pre+zip_path  # pseudo-fs path
        if fspath.startswith(self.egg_root+os.sep):
            return fspath[len(self.egg_root)+1:].split(os.sep)
        raise AssertionError(
            "%s is not a subpath of %s" % (fspath,self.egg_root)
        )

    def get_resource_filename(self, manager, resource_name):
        if not self.egg_name:
            raise NotImplementedError(
                "resource_filename() only supported for .egg, not .zip"
            )
        # no need to lock for extraction, since we use temp names
        zip_path = self._resource_to_zip(resource_name)
        eagers = self._get_eager_resources()
        if '/'.join(self._parts(zip_path)) in eagers:
            for name in eagers:
                self._extract_resource(manager, self._eager_to_zip(name))
        return self._extract_resource(manager, zip_path)

    @staticmethod
    def _get_date_and_size(zip_stat):
        t,d,size = zip_stat[5], zip_stat[6], zip_stat[3]
        date_time = (
            (d>>9)+1980, (d>>5)&0xF, d&0x1F,                      # ymd
            (t&0xFFFF)>>11, (t>>5)&0x3F, (t&0x1F) * 2, 0, 0, -1   # hms, etc.
        )
        timestamp = time.mktime(date_time)
        return timestamp, size

    def _extract_resource(self, manager, zip_path):

        if zip_path in self._index():
            for name in self._index()[zip_path]:
                last = self._extract_resource(
                    manager, os.path.join(zip_path, name)
                )
            return os.path.dirname(last)  # return the extracted directory name

        timestamp, size = self._get_date_and_size(self.zipinfo[zip_path])

        if not WRITE_SUPPORT:
            raise IOError('"os.rename" and "os.unlink" are not supported '
                          'on this platform')
        try:

            real_path = manager.get_cache_path(
                self.egg_name, self._parts(zip_path)
            )

            if self.is_current(real_path, zip_path):
                return real_path

            outf, tmpnam = _mkstemp(".$extract", dir=os.path.dirname(real_path))
            os.write(outf, self.loader.get_data(zip_path))
            os.close(outf)
            utime(tmpnam, (timestamp,timestamp))
            manager.postprocess(tmpnam, real_path)

            try:
                rename(tmpnam, real_path)

            except os.error:
                if os.path.isfile(real_path):
                    if self._is_current(real_path, zip_path):
                        # the file became current since it was checked above,
                        #  so proceed.
                        return real_path
                    elif os.name=='nt':     # Windows, del old file and retry
                        unlink(real_path)
                        rename(tmpnam, real_path)
                        return real_path
                raise

        except os.error:
            manager.extraction_error()  # report a user-friendly error

        return real_path

    def _is_current(self, file_path, zip_path):
        """
        Return True if the file_path is current for this zip_path
        """
        timestamp, size = self._get_date_and_size(self.zipinfo[zip_path])
        if not os.path.isfile(file_path):
            return False
        stat = os.stat(file_path)
        if stat.st_size!=size or stat.st_mtime!=timestamp:
            return False
        # check that the contents match
        zip_contents = self.loader.get_data(zip_path)
        f = open(file_path, 'rb')
        file_contents = f.read()
        f.close()
        return zip_contents == file_contents

    def _get_eager_resources(self):
        if self.eagers is None:
            eagers = []
            for name in ('native_libs.txt', 'eager_resources.txt'):
                if self.has_metadata(name):
                    eagers.extend(self.get_metadata_lines(name))
            self.eagers = eagers
        return self.eagers

    def _index(self):
        try:
            return self._dirindex
        except AttributeError:
            ind = {}
            for path in self.zipinfo:
                parts = path.split(os.sep)
                while parts:
                    parent = os.sep.join(parts[:-1])
                    if parent in ind:
                        ind[parent].append(parts[-1])
                        break
                    else:
                        ind[parent] = [parts.pop()]
            self._dirindex = ind
            return ind

    def _has(self, fspath):
        zip_path = self._zipinfo_name(fspath)
        return zip_path in self.zipinfo or zip_path in self._index()

    def _isdir(self,fspath):
        return self._zipinfo_name(fspath) in self._index()

    def _listdir(self,fspath):
        return list(self._index().get(self._zipinfo_name(fspath), ()))

    def _eager_to_zip(self,resource_name):
        return self._zipinfo_name(self._fn(self.egg_root,resource_name))

    def _resource_to_zip(self,resource_name):
        return self._zipinfo_name(self._fn(self.module_path,resource_name))

register_loader_type(zipimport.zipimporter, ZipProvider)
























class FileMetadata(EmptyProvider):
    """Metadata handler for standalone PKG-INFO files

    Usage::

        metadata = FileMetadata("/path/to/PKG-INFO")

    This provider rejects all data and metadata requests except for PKG-INFO,
    which is treated as existing, and will be the contents of the file at
    the provided location.
    """

    def __init__(self,path):
        self.path = path

    def has_metadata(self,name):
        return name=='PKG-INFO'

    def get_metadata(self,name):
        if name=='PKG-INFO':
            f = open(self.path,'rU')
            metadata = f.read()
            f.close()
            return metadata
        raise KeyError("No metadata except PKG-INFO is available")

    def get_metadata_lines(self,name):
        return yield_lines(self.get_metadata(name))
















class PathMetadata(DefaultProvider):
    """Metadata provider for egg directories

    Usage::

        # Development eggs:

        egg_info = "/path/to/PackageName.egg-info"
        base_dir = os.path.dirname(egg_info)
        metadata = PathMetadata(base_dir, egg_info)
        dist_name = os.path.splitext(os.path.basename(egg_info))[0]
        dist = Distribution(basedir,project_name=dist_name,metadata=metadata)

        # Unpacked egg directories:

        egg_path = "/path/to/PackageName-ver-pyver-etc.egg"
        metadata = PathMetadata(egg_path, os.path.join(egg_path,'EGG-INFO'))
        dist = Distribution.from_filename(egg_path, metadata=metadata)
    """

    def __init__(self, path, egg_info):
        self.module_path = path
        self.egg_info = egg_info


class EggMetadata(ZipProvider):
    """Metadata provider for .egg files"""

    def __init__(self, importer):
        """Create a metadata provider from a zipimporter"""

        self.zipinfo = zipimport._zip_directory_cache[importer.archive]
        self.zip_pre = importer.archive+os.sep
        self.loader = importer
        if importer.prefix:
            self.module_path = os.path.join(importer.archive, importer.prefix)
        else:
            self.module_path = importer.archive
        self._setup_prefix()


class ImpWrapper:
    """PEP 302 Importer that wraps Python's "normal" import algorithm"""

    def __init__(self, path=None):
        self.path = path

    def find_module(self, fullname, path=None):
        subname = fullname.split(".")[-1]
        if subname != fullname and self.path is None:
            return None
        if self.path is None:
            path = None
        else:
            path = [self.path]
        try:
            file, filename, etc = imp.find_module(subname, path)
        except ImportError:
            return None
        return ImpLoader(file, filename, etc)


class ImpLoader:
    """PEP 302 Loader that wraps Python's "normal" import algorithm"""

    def __init__(self, file, filename, etc):
        self.file = file
        self.filename = filename
        self.etc = etc

    def load_module(self, fullname):
        try:
            mod = imp.load_module(fullname, self.file, self.filename, self.etc)
        finally:
            if self.file: self.file.close()
        # Note: we don't set __loader__ because we want the module to look
        # normal; i.e. this is just a wrapper for standard import machinery
        return mod




def get_importer(path_item):
    """Retrieve a PEP 302 "importer" for the given path item

    If there is no importer, this returns a wrapper around the builtin import
    machinery.  The returned importer is only cached if it was created by a
    path hook.
    """
    try:
        importer = sys.path_importer_cache[path_item]
    except KeyError:
        for hook in sys.path_hooks:
            try:
                importer = hook(path_item)
            except ImportError:
                pass
            else:
                break
        else:
            importer = None

    sys.path_importer_cache.setdefault(path_item,importer)
    if importer is None:
        try:
            importer = ImpWrapper(path_item)
        except ImportError:
            pass
    return importer

try:
    from pkgutil import get_importer, ImpImporter
except ImportError:
    pass    # Python 2.3 or 2.4, use our own implementation
else:
    ImpWrapper = ImpImporter    # Python 2.5, use pkgutil's implementation
    del ImpLoader, ImpImporter






_declare_state('dict', _distribution_finders = {})

def register_finder(importer_type, distribution_finder):
    """Register `distribution_finder` to find distributions in sys.path items

    `importer_type` is the type or class of a PEP 302 "Importer" (sys.path item
    handler), and `distribution_finder` is a callable that, passed a path
    item and the importer instance, yields ``Distribution`` instances found on
    that path item.  See ``pkg_resources.find_on_path`` for an example."""
    _distribution_finders[importer_type] = distribution_finder


def find_distributions(path_item, only=False):
    """Yield distributions accessible via `path_item`"""
    importer = get_importer(path_item)
    finder = _find_adapter(_distribution_finders, importer)
    return finder(importer, path_item, only)

def find_in_zip(importer, path_item, only=False):
    metadata = EggMetadata(importer)
    if metadata.has_metadata('PKG-INFO'):
        yield Distribution.from_filename(path_item, metadata=metadata)
    if only:
        return  # don't yield nested distros
    for subitem in metadata.resource_listdir('/'):
        if subitem.endswith('.egg'):
            subpath = os.path.join(path_item, subitem)
            for dist in find_in_zip(zipimport.zipimporter(subpath), subpath):
                yield dist

register_finder(zipimport.zipimporter, find_in_zip)

def StringIO(*args, **kw):
    """Thunk to load the real StringIO on demand"""
    global StringIO
    try:
        from cStringIO import StringIO
    except ImportError:
        from StringIO import StringIO
    return StringIO(*args,**kw)

def find_nothing(importer, path_item, only=False):
    return ()
register_finder(object,find_nothing)

def find_on_path(importer, path_item, only=False):
    """Yield distributions accessible on a sys.path directory"""
    path_item = _normalize_cached(path_item)

    if os.path.isdir(path_item) and os.access(path_item, os.R_OK):
        if path_item.lower().endswith('.egg'):
            # unpacked egg
            yield Distribution.from_filename(
                path_item, metadata=PathMetadata(
                    path_item, os.path.join(path_item,'EGG-INFO')
                )
            )
        else:
            # scan for .egg and .egg-info in directory
            for entry in os.listdir(path_item):
                lower = entry.lower()
                if lower.endswith('.egg-info') or lower.endswith('.dist-info'):
                    fullpath = os.path.join(path_item, entry)
                    if os.path.isdir(fullpath):
                        # egg-info directory, allow getting metadata
                        metadata = PathMetadata(path_item, fullpath)
                    else:
                        metadata = FileMetadata(fullpath)
                    yield Distribution.from_location(
                        path_item,entry,metadata,precedence=DEVELOP_DIST
                    )
                elif not only and lower.endswith('.egg'):
                    for dist in find_distributions(os.path.join(path_item, entry)):
                        yield dist
                elif not only and lower.endswith('.egg-link'):
                    entry_file = open(os.path.join(path_item, entry))
                    try:
                        entry_lines = entry_file.readlines()
                    finally:
                        entry_file.close()
                    for line in entry_lines:
                        if not line.strip(): continue
                        for item in find_distributions(os.path.join(path_item,line.rstrip())):
                            yield item
                        break
register_finder(ImpWrapper,find_on_path)

if importlib_bootstrap is not None:
    register_finder(importlib_bootstrap.FileFinder, find_on_path)

_declare_state('dict', _namespace_handlers={})
_declare_state('dict', _namespace_packages={})


def register_namespace_handler(importer_type, namespace_handler):
    """Register `namespace_handler` to declare namespace packages

    `importer_type` is the type or class of a PEP 302 "Importer" (sys.path item
    handler), and `namespace_handler` is a callable like this::

        def namespace_handler(importer,path_entry,moduleName,module):
            # return a path_entry to use for child packages

    Namespace handlers are only called if the importer object has already
    agreed that it can handle the relevant path item, and they should only
    return a subpath if the module __path__ does not already contain an
    equivalent subpath.  For an example namespace handler, see
    ``pkg_resources.file_ns_handler``.
    """
    _namespace_handlers[importer_type] = namespace_handler

def _handle_ns(packageName, path_item):
    """Ensure that named package includes a subpath of path_item (if needed)"""
    importer = get_importer(path_item)
    if importer is None:
        return None
    loader = importer.find_module(packageName)
    if loader is None:
        return None
    module = sys.modules.get(packageName)
    if module is None:
        module = sys.modules[packageName] = types.ModuleType(packageName)
        module.__path__ = []; _set_parent_ns(packageName)
    elif not hasattr(module,'__path__'):
        raise TypeError("Not a package:", packageName)
    handler = _find_adapter(_namespace_handlers, importer)
    subpath = handler(importer,path_item,packageName,module)
    if subpath is not None:
        path = module.__path__; path.append(subpath)
        loader.load_module(packageName); module.__path__ = path
    return subpath

def declare_namespace(packageName):
    """Declare that package 'packageName' is a namespace package"""

    imp.acquire_lock()
    try:
        if packageName in _namespace_packages:
            return

        path, parent = sys.path, None
        if '.' in packageName:
            parent = '.'.join(packageName.split('.')[:-1])
            declare_namespace(parent)
            if parent not in _namespace_packages:
                __import__(parent)
            try:
                path = sys.modules[parent].__path__
            except AttributeError:
                raise TypeError("Not a package:", parent)

        # Track what packages are namespaces, so when new path items are added,
        # they can be updated
        _namespace_packages.setdefault(parent,[]).append(packageName)
        _namespace_packages.setdefault(packageName,[])

        for path_item in path:
            # Ensure all the parent's path items are reflected in the child,
            # if they apply
            _handle_ns(packageName, path_item)

    finally:
        imp.release_lock()

def fixup_namespace_packages(path_item, parent=None):
    """Ensure that previously-declared namespace packages include path_item"""
    imp.acquire_lock()
    try:
        for package in _namespace_packages.get(parent,()):
            subpath = _handle_ns(package, path_item)
            if subpath: fixup_namespace_packages(subpath,package)
    finally:
        imp.release_lock()

def file_ns_handler(importer, path_item, packageName, module):
    """Compute an ns-package subpath for a filesystem or zipfile importer"""

    subpath = os.path.join(path_item, packageName.split('.')[-1])
    normalized = _normalize_cached(subpath)
    for item in module.__path__:
        if _normalize_cached(item)==normalized:
            break
    else:
        # Only return the path if it's not already there
        return subpath

register_namespace_handler(ImpWrapper,file_ns_handler)
register_namespace_handler(zipimport.zipimporter,file_ns_handler)

if importlib_bootstrap is not None:
    register_namespace_handler(importlib_bootstrap.FileFinder, file_ns_handler)


def null_ns_handler(importer, path_item, packageName, module):
    return None

register_namespace_handler(object,null_ns_handler)


def normalize_path(filename):
    """Normalize a file/dir name for comparison purposes"""
    return os.path.normcase(os.path.realpath(filename))

def _normalize_cached(filename,_cache={}):
    try:
        return _cache[filename]
    except KeyError:
        _cache[filename] = result = normalize_path(filename)
        return result

def _set_parent_ns(packageName):
    parts = packageName.split('.')
    name = parts.pop()
    if parts:
        parent = '.'.join(parts)
        setattr(sys.modules[parent], name, sys.modules[packageName])


def yield_lines(strs):
    """Yield non-empty/non-comment lines of a ``basestring`` or sequence"""
    if isinstance(strs,basestring):
        for s in strs.splitlines():
            s = s.strip()
            if s and not s.startswith('#'):     # skip blank lines/comments
                yield s
    else:
        for ss in strs:
            for s in yield_lines(ss):
                yield s

LINE_END = re.compile(r"\s*(#.*)?$").match         # whitespace and comment
CONTINUE = re.compile(r"\s*\\\s*(#.*)?$").match    # line continuation
DISTRO   = re.compile(r"\s*((\w|[-.])+)").match    # Distribution or extra
VERSION  = re.compile(r"\s*(<=?|>=?|==|!=)\s*((\w|[-.])+)").match  # ver. info
COMMA    = re.compile(r"\s*,").match               # comma between items
OBRACKET = re.compile(r"\s*\[").match
CBRACKET = re.compile(r"\s*\]").match
MODULE   = re.compile(r"\w+(\.\w+)*$").match
EGG_NAME = re.compile(
    r"(?P<name>[^-]+)"
    r"( -(?P<ver>[^-]+) (-py(?P<pyver>[^-]+) (-(?P<plat>.+))? )? )?",
    re.VERBOSE | re.IGNORECASE
).match

component_re = re.compile(r'(\d+ | [a-z]+ | \.| -)', re.VERBOSE)
replace = {'pre':'c', 'preview':'c','-':'final-','rc':'c','dev':'@'}.get

def _parse_version_parts(s):
    for part in component_re.split(s):
        part = replace(part,part)
        if not part or part=='.':
            continue
        if part[:1] in '0123456789':
            yield part.zfill(8)    # pad for numeric comparison
        else:
            yield '*'+part

    yield '*final'  # ensure that alpha/beta/candidate are before final

def parse_version(s):
    """Convert a version string to a chronologically-sortable key

    This is a rough cross between distutils' StrictVersion and LooseVersion;
    if you give it versions that would work with StrictVersion, then it behaves
    the same; otherwise it acts like a slightly-smarter LooseVersion. It is
    *possible* to create pathological version coding schemes that will fool
    this parser, but they should be very rare in practice.

    The returned value will be a tuple of strings.  Numeric portions of the
    version are padded to 8 digits so they will compare numerically, but
    without relying on how numbers compare relative to strings.  Dots are
    dropped, but dashes are retained.  Trailing zeros between alpha segments
    or dashes are suppressed, so that e.g. "2.4.0" is considered the same as
    "2.4". Alphanumeric parts are lower-cased.

    The algorithm assumes that strings like "-" and any alpha string that
    alphabetically follows "final"  represents a "patch level".  So, "2.4-1"
    is assumed to be a branch or patch of "2.4", and therefore "2.4.1" is
    considered newer than "2.4-1", which in turn is newer than "2.4".

    Strings like "a", "b", "c", "alpha", "beta", "candidate" and so on (that
    come before "final" alphabetically) are assumed to be pre-release versions,
    so that the version "2.4" is considered newer than "2.4a1".

    Finally, to handle miscellaneous cases, the strings "pre", "preview", and
    "rc" are treated as if they were "c", i.e. as though they were release
    candidates, and therefore are not as new as a version string that does not
    contain them, and "dev" is replaced with an '@' so that it sorts lower than
    than any other pre-release tag.
    """
    parts = []
    for part in _parse_version_parts(s.lower()):
        if part.startswith('*'):
            if part<'*final':   # remove '-' before a prerelease tag
                while parts and parts[-1]=='*final-': parts.pop()
            # remove trailing zeros from each series of numeric parts
            while parts and parts[-1]=='00000000':
                parts.pop()
        parts.append(part)
    return tuple(parts)

class EntryPoint(object):
    """Object representing an advertised importable object"""

    def __init__(self, name, module_name, attrs=(), extras=(), dist=None):
        if not MODULE(module_name):
            raise ValueError("Invalid module name", module_name)
        self.name = name
        self.module_name = module_name
        self.attrs = tuple(attrs)
        self.extras = Requirement.parse(("x[%s]" % ','.join(extras))).extras
        self.dist = dist

    def __str__(self):
        s = "%s = %s" % (self.name, self.module_name)
        if self.attrs:
            s += ':' + '.'.join(self.attrs)
        if self.extras:
            s += ' [%s]' % ','.join(self.extras)
        return s

    def __repr__(self):
        return "EntryPoint.parse(%r)" % str(self)

    def load(self, require=True, env=None, installer=None):
        if require: self.require(env, installer)
        entry = __import__(self.module_name, globals(),globals(), ['__name__'])
        for attr in self.attrs:
            try:
                entry = getattr(entry,attr)
            except AttributeError:
                raise ImportError("%r has no %r attribute" % (entry,attr))
        return entry

    def require(self, env=None, installer=None):
        if self.extras and not self.dist:
            raise UnknownExtra("Can't require() without a distribution", self)
        map(working_set.add,
            working_set.resolve(self.dist.requires(self.extras),env,installer))



    #@classmethod
    def parse(cls, src, dist=None):
        """Parse a single entry point from string `src`

        Entry point syntax follows the form::

            name = some.module:some.attr [extra1,extra2]

        The entry name and module name are required, but the ``:attrs`` and
        ``[extras]`` parts are optional
        """
        try:
            attrs = extras = ()
            name,value = src.split('=',1)
            if '[' in value:
                value,extras = value.split('[',1)
                req = Requirement.parse("x["+extras)
                if req.specs: raise ValueError
                extras = req.extras
            if ':' in value:
                value,attrs = value.split(':',1)
                if not MODULE(attrs.rstrip()):
                    raise ValueError
                attrs = attrs.rstrip().split('.')
        except ValueError:
            raise ValueError(
                "EntryPoint must be in 'name=module:attrs [extras]' format",
                src
            )
        else:
            return cls(name.strip(), value.strip(), attrs, extras, dist)

    parse = classmethod(parse)








    #@classmethod
    def parse_group(cls, group, lines, dist=None):
        """Parse an entry point group"""
        if not MODULE(group):
            raise ValueError("Invalid group name", group)
        this = {}
        for line in yield_lines(lines):
            ep = cls.parse(line, dist)
            if ep.name in this:
                raise ValueError("Duplicate entry point", group, ep.name)
            this[ep.name]=ep
        return this

    parse_group = classmethod(parse_group)

    #@classmethod
    def parse_map(cls, data, dist=None):
        """Parse a map of entry point groups"""
        if isinstance(data,dict):
            data = data.items()
        else:
            data = split_sections(data)
        maps = {}
        for group, lines in data:
            if group is None:
                if not lines:
                    continue
                raise ValueError("Entry points must be listed in groups")
            group = group.strip()
            if group in maps:
                raise ValueError("Duplicate group name", group)
            maps[group] = cls.parse_group(group, lines, dist)
        return maps

    parse_map = classmethod(parse_map)


def _remove_md5_fragment(location):
    if not location:
        return ''
    parsed = urlparse(location)
    if parsed[-1].startswith('md5='):
        return urlunparse(parsed[:-1] + ('',))
    return location


class Distribution(object):
    """Wrap an actual or potential sys.path entry w/metadata"""
    PKG_INFO = 'PKG-INFO'

    def __init__(self,
        location=None, metadata=None, project_name=None, version=None,
        py_version=PY_MAJOR, platform=None, precedence = EGG_DIST
    ):
        self.project_name = safe_name(project_name or 'Unknown')
        if version is not None:
            self._version = safe_version(version)
        self.py_version = py_version
        self.platform = platform
        self.location = location
        self.precedence = precedence
        self._provider = metadata or empty_provider

    #@classmethod
    def from_location(cls,location,basename,metadata=None,**kw):
        project_name, version, py_version, platform = [None]*4
        basename, ext = os.path.splitext(basename)
        if ext.lower() in _distributionImpl:
            # .dist-info gets much metadata differently
            match = EGG_NAME(basename)
            if match:
                project_name, version, py_version, platform = match.group(
                    'name','ver','pyver','plat'
                )
            cls = _distributionImpl[ext.lower()]
        return cls(
            location, metadata, project_name=project_name, version=version,
            py_version=py_version, platform=platform, **kw
        )
    from_location = classmethod(from_location)


    hashcmp = property(
        lambda self: (
            getattr(self,'parsed_version',()),
            self.precedence,
            self.key,
            _remove_md5_fragment(self.location),
            self.py_version,
            self.platform
        )
    )
    def __hash__(self): return hash(self.hashcmp)
    def __lt__(self, other):
        return self.hashcmp < other.hashcmp
    def __le__(self, other):
        return self.hashcmp <= other.hashcmp
    def __gt__(self, other):
        return self.hashcmp > other.hashcmp
    def __ge__(self, other):
        return self.hashcmp >= other.hashcmp
    def __eq__(self, other):
        if not isinstance(other, self.__class__):
            # It's not a Distribution, so they are not equal
            return False
        return self.hashcmp == other.hashcmp
    def __ne__(self, other):
        return not self == other

    # These properties have to be lazy so that we don't have to load any
    # metadata until/unless it's actually needed.  (i.e., some distributions
    # may not know their name or version without loading PKG-INFO)

    #@property
    def key(self):
        try:
            return self._key
        except AttributeError:
            self._key = key = self.project_name.lower()
            return key
    key = property(key)

    #@property
    def parsed_version(self):
        try:
            return self._parsed_version
        except AttributeError:
            self._parsed_version = pv = parse_version(self.version)
            return pv

    parsed_version = property(parsed_version)

    #@property
    def version(self):
        try:
            return self._version
        except AttributeError:
            for line in self._get_metadata(self.PKG_INFO):
                if line.lower().startswith('version:'):
                    self._version = safe_version(line.split(':',1)[1].strip())
                    return self._version
            else:
                raise ValueError(
                    "Missing 'Version:' header and/or %s file" % self.PKG_INFO, self
                )
    version = property(version)




    #@property
    def _dep_map(self):
        try:
            return self.__dep_map
        except AttributeError:
            dm = self.__dep_map = {None: []}
            for name in 'requires.txt', 'depends.txt':
                for extra,reqs in split_sections(self._get_metadata(name)):
                    if extra: extra = safe_extra(extra)
                    dm.setdefault(extra,[]).extend(parse_requirements(reqs))
            return dm
    _dep_map = property(_dep_map)

    def requires(self,extras=()):
        """List of Requirements needed for this distro if `extras` are used"""
        dm = self._dep_map
        deps = []
        deps.extend(dm.get(None,()))
        for ext in extras:
            try:
                deps.extend(dm[safe_extra(ext)])
            except KeyError:
                raise UnknownExtra(
                    "%s has no such extra feature %r" % (self, ext)
                )
        return deps

    def _get_metadata(self,name):
        if self.has_metadata(name):
            for line in self.get_metadata_lines(name):
                yield line

    def activate(self,path=None):
        """Ensure distribution is importable on `path` (default=sys.path)"""
        if path is None: path = sys.path
        self.insert_on(path)
        if path is sys.path:
            fixup_namespace_packages(self.location)
            map(declare_namespace, self._get_metadata('namespace_packages.txt'))


    def egg_name(self):
        """Return what this distribution's standard .egg filename should be"""
        filename = "%s-%s-py%s" % (
            to_filename(self.project_name), to_filename(self.version),
            self.py_version or PY_MAJOR
        )

        if self.platform:
            filename += '-'+self.platform
        return filename

    def __repr__(self):
        if self.location:
            return "%s (%s)" % (self,self.location)
        else:
            return str(self)

    def __str__(self):
        try: version = getattr(self,'version',None)
        except ValueError: version = None
        version = version or "[unknown version]"
        return "%s %s" % (self.project_name,version)

    def __getattr__(self,attr):
        """Delegate all unrecognized public attributes to .metadata provider"""
        if attr.startswith('_'):
            raise AttributeError,attr
        return getattr(self._provider, attr)

    #@classmethod
    def from_filename(cls,filename,metadata=None, **kw):
        return cls.from_location(
            _normalize_cached(filename), os.path.basename(filename), metadata,
            **kw
        )
    from_filename = classmethod(from_filename)

    def as_requirement(self):
        """Return a ``Requirement`` that matches this distribution exactly"""
        return Requirement.parse('%s==%s' % (self.project_name, self.version))

    def load_entry_point(self, group, name):
        """Return the `name` entry point of `group` or raise ImportError"""
        ep = self.get_entry_info(group,name)
        if ep is None:
            raise ImportError("Entry point %r not found" % ((group,name),))
        return ep.load()

    def get_entry_map(self, group=None):
        """Return the entry point map for `group`, or the full entry map"""
        try:
            ep_map = self._ep_map
        except AttributeError:
            ep_map = self._ep_map = EntryPoint.parse_map(
                self._get_metadata('entry_points.txt'), self
            )
        if group is not None:
            return ep_map.get(group,{})
        return ep_map

    def get_entry_info(self, group, name):
        """Return the EntryPoint object for `group`+`name`, or ``None``"""
        return self.get_entry_map(group).get(name)



















    def insert_on(self, path, loc = None):
        """Insert self.location in path before its nearest parent directory"""

        loc = loc or self.location

        if self.project_name == 'setuptools':
            try:
                version = self.version
            except ValueError:
                version = ''
            if '0.7' in version:
                raise ValueError(
                    "A 0.7-series setuptools cannot be installed "
                    "with distribute. Found one at %s" % str(self.location))

        if not loc:
            return

        if path is sys.path:
            self.check_version_conflict()

        nloc = _normalize_cached(loc)
        bdir = os.path.dirname(nloc)
        npath= map(_normalize_cached, path)

        bp = None
        for p, item in enumerate(npath):
            if item==nloc:
                break
            elif item==bdir and self.precedence==EGG_DIST:
                # if it's an .egg, give it precedence over its directory
                path.insert(p, loc)
                npath.insert(p, nloc)
                break
        else:
            path.append(loc)
            return

        # p is the spot where we found or inserted loc; now remove duplicates
        while 1:
            try:
                np = npath.index(nloc, p+1)
            except ValueError:
                break
            else:
                del npath[np], path[np]
                p = np  # ha!

        return



    def check_version_conflict(self):
        if self.key=='distribute':
            return      # ignore the inevitable setuptools self-conflicts  :(

        nsp = dict.fromkeys(self._get_metadata('namespace_packages.txt'))
        loc = normalize_path(self.location)
        for modname in self._get_metadata('top_level.txt'):
            if (modname not in sys.modules or modname in nsp
                or modname in _namespace_packages
            ):
                continue
            if modname in ('pkg_resources', 'setuptools', 'site'):
                continue
            fn = getattr(sys.modules[modname], '__file__', None)
            if fn and (normalize_path(fn).startswith(loc) or
                       fn.startswith(self.location)):
                continue
            issue_warning(
                "Module %s was already imported from %s, but %s is being added"
                " to sys.path" % (modname, fn, self.location),
            )

    def has_version(self):
        try:
            self.version
        except ValueError:
            issue_warning("Unbuilt egg for "+repr(self))
            return False
        return True

    def clone(self,**kw):
        """Copy this distribution, substituting in any changed keyword args"""
        for attr in (
            'project_name', 'version', 'py_version', 'platform', 'location',
            'precedence'
        ):
            kw.setdefault(attr, getattr(self,attr,None))
        kw.setdefault('metadata', self._provider)
        return self.__class__(**kw)




    #@property
    def extras(self):
        return [dep for dep in self._dep_map if dep]
    extras = property(extras)


class DistInfoDistribution(Distribution):
    """Wrap an actual or potential sys.path entry w/metadata, .dist-info style"""
    PKG_INFO = 'METADATA'
    EQEQ = re.compile(r"([\(,])\s*(\d.*?)\s*([,\)])")

    @property
    def _parsed_pkg_info(self):
        """Parse and cache metadata"""
        try:
            return self._pkg_info
        except AttributeError:
            from email.parser import Parser
            self._pkg_info = Parser().parsestr(self.get_metadata(self.PKG_INFO))
            return self._pkg_info

    @property
    def _dep_map(self):
        try:
            return self.__dep_map
        except AttributeError:
            self.__dep_map = self._compute_dependencies()
            return self.__dep_map

    def _preparse_requirement(self, requires_dist):
        """Convert 'Foobar (1); baz' to ('Foobar ==1', 'baz')
        Split environment marker, add == prefix to version specifiers as
        necessary, and remove parenthesis.
        """
        parts = requires_dist.split(';', 1) + ['']
        distvers = parts[0].strip()
        mark = parts[1].strip()
        distvers = re.sub(self.EQEQ, r"\1==\2\3", distvers)
        distvers = distvers.replace('(', '').replace(')', '')
        return (distvers, mark)

    def _compute_dependencies(self):
        """Recompute this distribution's dependencies."""
        from _markerlib import compile as compile_marker
        dm = self.__dep_map = {None: []}

        reqs = []
        # Including any condition expressions
        for req in self._parsed_pkg_info.get_all('Requires-Dist') or []:
            distvers, mark = self._preparse_requirement(req)
            parsed = parse_requirements(distvers).next()
            parsed.marker_fn = compile_marker(mark)
            reqs.append(parsed)

        def reqs_for_extra(extra):
            for req in reqs:
                if req.marker_fn(override={'extra':extra}):
                    yield req

        common = frozenset(reqs_for_extra(None))
        dm[None].extend(common)

        for extra in self._parsed_pkg_info.get_all('Provides-Extra') or []:
            extra = safe_extra(extra.strip())
            dm[extra] = list(frozenset(reqs_for_extra(extra)) - common)

        return dm


_distributionImpl = {'.egg': Distribution,
                     '.egg-info': Distribution,
                     '.dist-info': DistInfoDistribution }


def issue_warning(*args,**kw):
    level = 1
    g = globals()
    try:
        # find the first stack frame that is *not* code in
        # the pkg_resources module, to use for the warning
        while sys._getframe(level).f_globals is g:
            level += 1
    except ValueError:
        pass
    from warnings import warn
    warn(stacklevel = level+1, *args, **kw)























def parse_requirements(strs):
    """Yield ``Requirement`` objects for each specification in `strs`

    `strs` must be an instance of ``basestring``, or a (possibly-nested)
    iterable thereof.
    """
    # create a steppable iterator, so we can handle \-continuations
    lines = iter(yield_lines(strs))

    def scan_list(ITEM,TERMINATOR,line,p,groups,item_name):

        items = []

        while not TERMINATOR(line,p):
            if CONTINUE(line,p):
                try:
                    line = lines.next(); p = 0
                except StopIteration:
                    raise ValueError(
                        "\\ must not appear on the last nonblank line"
                    )

            match = ITEM(line,p)
            if not match:
                raise ValueError("Expected "+item_name+" in",line,"at",line[p:])

            items.append(match.group(*groups))
            p = match.end()

            match = COMMA(line,p)
            if match:
                p = match.end() # skip the comma
            elif not TERMINATOR(line,p):
                raise ValueError(
                    "Expected ',' or end-of-list in",line,"at",line[p:]
                )

        match = TERMINATOR(line,p)
        if match: p = match.end()   # skip the terminator, if any
        return line, p, items

    for line in lines:
        match = DISTRO(line)
        if not match:
            raise ValueError("Missing distribution spec", line)
        project_name = match.group(1)
        p = match.end()
        extras = []

        match = OBRACKET(line,p)
        if match:
            p = match.end()
            line, p, extras = scan_list(
                DISTRO, CBRACKET, line, p, (1,), "'extra' name"
            )

        line, p, specs = scan_list(VERSION,LINE_END,line,p,(1,2),"version spec")
        specs = [(op,safe_version(val)) for op,val in specs]
        yield Requirement(project_name, specs, extras)


def _sort_dists(dists):
    tmp = [(dist.hashcmp,dist) for dist in dists]
    tmp.sort()
    dists[::-1] = [d for hc,d in tmp]

















class Requirement:
    def __init__(self, project_name, specs, extras):
        """DO NOT CALL THIS UNDOCUMENTED METHOD; use Requirement.parse()!"""
        self.unsafe_name, project_name = project_name, safe_name(project_name)
        self.project_name, self.key = project_name, project_name.lower()
        index = [(parse_version(v),state_machine[op],op,v) for op,v in specs]
        index.sort()
        self.specs = [(op,ver) for parsed,trans,op,ver in index]
        self.index, self.extras = index, tuple(map(safe_extra,extras))
        self.hashCmp = (
            self.key, tuple([(op,parsed) for parsed,trans,op,ver in index]),
            frozenset(self.extras)
        )
        self.__hash = hash(self.hashCmp)

    def __str__(self):
        specs = ','.join([''.join(s) for s in self.specs])
        extras = ','.join(self.extras)
        if extras: extras = '[%s]' % extras
        return '%s%s%s' % (self.project_name, extras, specs)

    def __eq__(self,other):
        return isinstance(other,Requirement) and self.hashCmp==other.hashCmp

    def __contains__(self,item):
        if isinstance(item,Distribution):
            if item.key <> self.key: return False
            if self.index: item = item.parsed_version  # only get if we need it
        elif isinstance(item,basestring):
            item = parse_version(item)
        last = None
        compare = lambda a, b: (a > b) - (a < b) # -1, 0, 1
        for parsed,trans,op,ver in self.index:
            action = trans[compare(item,parsed)] # Indexing: 0, 1, -1
            if action=='F':     return False
            elif action=='T':   return True
            elif action=='+':   last = True
            elif action=='-' or last is None:   last = False
        if last is None: last = True    # no rules encountered
        return last


    def __hash__(self):
        return self.__hash

    def __repr__(self): return "Requirement.parse(%r)" % str(self)

    #@staticmethod
    def parse(s, replacement=True):
        reqs = list(parse_requirements(s))
        if reqs:
            if len(reqs) == 1:
                founded_req = reqs[0]
                # if asked for setuptools distribution
                # and if distribute is installed, we want to give
                # distribute instead
                if _override_setuptools(founded_req) and replacement:
                    distribute = list(parse_requirements('distribute'))
                    if len(distribute) == 1:
                        return distribute[0]
                    return founded_req
                else:
                    return founded_req

            raise ValueError("Expected only one requirement", s)
        raise ValueError("No requirements found", s)

    parse = staticmethod(parse)

state_machine = {
    #       =><
    '<' :  '--T',
    '<=':  'T-T',
    '>' :  'F+F',
    '>=':  'T+F',
    '==':  'T..',
    '!=':  'F++',
}


def _override_setuptools(req):
    """Return True when distribute wants to override a setuptools dependency.

    We want to override when the requirement is setuptools and the version is
    a variant of 0.6.

    """
    if req.project_name == 'setuptools':
        if not len(req.specs):
            # Just setuptools: ok
            return True
        for comparator, version in req.specs:
            if comparator in ['==', '>=', '>']:
                if '0.7' in version:
                    # We want some setuptools not from the 0.6 series.
                    return False
        return True
    return False


def _get_mro(cls):
    """Get an mro for a type or classic class"""
    if not isinstance(cls,type):
        class cls(cls,object): pass
        return cls.__mro__[1:]
    return cls.__mro__

def _find_adapter(registry, ob):
    """Return an adapter factory for `ob` from `registry`"""
    for t in _get_mro(getattr(ob, '__class__', type(ob))):
        if t in registry:
            return registry[t]


def ensure_directory(path):
    """Ensure that the parent directory of `path` exists"""
    dirname = os.path.dirname(path)
    if not os.path.isdir(dirname):
        os.makedirs(dirname)

def split_sections(s):
    """Split a string or iterable thereof into (section,content) pairs

    Each ``section`` is a stripped version of the section header ("[section]")
    and each ``content`` is a list of stripped lines excluding blank lines and
    comment-only lines.  If there are any such lines before the first section
    header, they're returned in a first ``section`` of ``None``.
    """
    section = None
    content = []
    for line in yield_lines(s):
        if line.startswith("["):
            if line.endswith("]"):
                if section or content:
                    yield section, content
                section = line[1:-1].strip()
                content = []
            else:
                raise ValueError("Invalid section heading", line)
        else:
            content.append(line)

    # wrap up last segment
    yield section, content

def _mkstemp(*args,**kw):
    from tempfile import mkstemp
    old_open = os.open
    try:
        os.open = os_open   # temporarily bypass sandboxing
        return mkstemp(*args,**kw)
    finally:
        os.open = old_open  # and then put it back


# Set up global resource manager (deliberately not state-saved)
_manager = ResourceManager()
def _initialize(g):
    for name in dir(_manager):
        if not name.startswith('_'):
            g[name] = getattr(_manager, name)
_initialize(globals())

# Prepare the master working set and make the ``require()`` API available
_declare_state('object', working_set = WorkingSet())

try:
    # Does the main program list any requirements?
    from __main__ import __requires__
except ImportError:
    pass # No: just use the default working set based on sys.path
else:
    # Yes: ensure the requirements are met, by prefixing sys.path if necessary
    try:
        working_set.require(__requires__)
    except VersionConflict:     # try it without defaults already on sys.path
        working_set = WorkingSet([])    # by starting with an empty path
        for dist in working_set.resolve(
            parse_requirements(__requires__), Environment()
        ):
            working_set.add(dist)
        for entry in sys.path:  # add any missing entries from sys.path
            if entry not in working_set.entries:
                working_set.add_entry(entry)
        sys.path[:] = working_set.entries   # then copy back to sys.path

require = working_set.require
iter_entry_points = working_set.iter_entry_points
add_activation_listener = working_set.subscribe
run_script = working_set.run_script
run_main = run_script   # backward compatibility
# Activate all distributions already on sys.path, and ensure that
# all distributions added to the working set in the future (e.g. by
# calling ``require()``) will get activated as well.
add_activation_listener(lambda dist: dist.activate())
working_set.entries=[]; map(working_set.add_entry,sys.path) # match order
Tip: Filter by directory path e.g. /media app.js to search for public/media/app.js.
Tip: Use camelCasing e.g. ProjME to search for ProjectModifiedEvent.java.
Tip: Filter by extension type e.g. /repo .js to search for all .js files in the /repo directory.
Tip: Separate your search with spaces e.g. /ssh pom.xml to search for src/ssh/pom.xml.
Tip: Use ↑ and ↓ arrow keys to navigate and return to view the file.
Tip: You can also navigate files with Ctrl+j (next) and Ctrl+k (previous) and view the file with Ctrl+o.
Tip: You can also navigate files with Alt+j (next) and Alt+k (previous) and view the file with Alt+o.