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dirk  committed 3e64a94

-Added GPL license statement and COPYING file
-Added documentation

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File doc/index.wiki

+@title: pynoweb
+@author: Dirk Baechle
+
+Being a long-time fan of [[http://www.cs.tufts.edu/~nr/noweb/ noweb]] by Norman Ramsey, I
+recently checked the internet for a Python clone. I detected $$noweb.py$$ by
+Jonathan Aquino (jonathan.aquino@gmail.com),
+(see [[http://jonaquino.blogspot.com/2010/04/nowebpy-or-worlds-first-executable-blog.html]])
+and gave it a try. While providing basic support for un''tangling'' chunks in $$*.nw$$
+files, it missed a ''file include'' option. My actual task was to write a rather long
+shell script (Bash) and I wanted to export it to one single file, but manage/edit it in
+pieces for a better overview.
+
+So, I took the source, twisted it in some places and added simple ''file includes''
+to the syntax.
+
+== Current version == current
+
+~[[pynoweb.zip pynoweb.zip]]||Archived folder with the Python script for $$pynoweb$$.
+
+== Basic usage == basic
+
+Noweb files are divided into chunks. The %%@%% sign in the first column of a line
+starts a new chunk, after it you can add arbitrary text as description. A chunk can also
+contain a code section where an output file can be extracted from. A piece of code is
+defined by the %%<\blank<tag>\blank>=%% marker. The %%tag%% can be a filename or
+a string with several words, separated by blanks.
+
+Within a code section you can refer to other defined code sections by using the
+%%<\blank<tag>\blank>%% marker (without the trailing %%=%%). 
+
+An example:
+
+{{Code:
+@
+
+<<output.sh>>=
+<<start of file>>
+<<end of file>>
+
+@
+
+<<start of file>>=
+echo "Hi"
+
+@
+
+<<end of file>>=
+echo "there!"
+
+}}
+
+Saving this as file %%output.nw%% you can extract the defined output chunk %%output.sh%%
+
+{{Code:
+echo "Hi"
+echo "there!"
+
+}}
+
+by the command
+
+Code:
+python noweb.py -Routput.sh output.nw > output.sh
+
+For more infos about noweb's syntax, refer to its manual please.
+
+== Extensions == extensions
+
+As an extension to this simple replace mechanism, you can include other files during the
+chunk parsing phase with the %%<\blank<file:infile_name>\blank>%% marker. It reads
+the file %%infile_name%% and adds its contents to the top file. These includes can be nested
+arbitrarily, but you have to be careful to avoid cyclic dependencies!
+
+Example:
+
+File %%main.nw%%
+
+{{Code:
+@
+
+<<main.sh>>=
+#!/bin/sh
+
+<<file:utils.sh>>
+<<utility stuff>>
+
+# EOF
+}}
+
+File %%utils.sh%%
+
+{{Code:
+@
+
+<<utility stuff>>=
+echo "Hi there!"
+
+}}
+
+Calling
+
+Code:
+python noweb.py -Rmain.sh main.nw > main.sh
+
+results in the output
+
+{{Code:
+#!/bin/sh
+
+echo "Hi there!"
+
+# EOF
+}}
+		    GNU GENERAL PUBLIC LICENSE
+		       Version 2, June 1991
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+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.
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+		     END OF TERMS AND CONDITIONS
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+
+	Appendix: How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
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+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
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+    Gnomovision version 69, Copyright (C) 19yy name of author
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+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
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+The hypothetical commands `show w' and `show c' should show the appropriate
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+be called something other than `show w' and `show c'; they could even be
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+You should also get your employer (if you work as a programmer) or your
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+  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+  <signature of Ty Coon>, 1 April 1989
+  Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
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+library.  If this is what you want to do, use the GNU Library General
+Public License instead of this License.

File src/noweb.py

+#!/usr/bin/env python
+#
+# noweb.py (https://code.launchpad.net/~dl9obn/pynoweb)
+#
+# Based on an idea by Jonathan Aquino (jonathan.aquino@gmail.com)
+#
+# This program is free software; you can redistribute it and/or modify it under
+# the terms of the GNU General Public License as published by the Free Software
+# Foundation; either version 2 of the License, or (at your option) any later
+# version.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along with
+# this program; if not, write to the Free Software Foundation, Inc.,
+# 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+#
+#
+# This program extracts code from a literate programming document in "noweb" format.
+# For more information, including the original source code and documentation,
+# see http://jonaquino.blogspot.com/2010/04/nowebpy-or-worlds-first-executable-blog.html
+#
+# Additional refactorings and modifications by Dirk Baechle (dl9obn@darc.de):
+#
+#  - You can now say <<file:included.txt>>, which reads in "include.txt"
+#    while parsing the noweb file(s). This can be done recursively and helps to
+#    organize long files (like shell scripts) in smaller pieces.
+#
+
+import sys,re
+
+OPEN = "<<"
+CLOSE = ">>"
+
+def expand(chunkName, chunks, indent):
+    chunkLines = chunks[chunkName]
+    expandedChunkLines = []
+    for line in chunkLines:
+        match = re.match("(\s*)" + OPEN + "([^>]+)" + CLOSE + "\s*$", line)
+        if match:
+            expandedChunkLines.extend(expand(match.group(2), chunks, indent + match.group(1)))
+        else:
+            expandedChunkLines.append(indent + line)
+    return expandedChunkLines
+
+def parseFile(filename, chunks):
+    file = open(filename)
+    chunkName = None
+    for line in file.readlines():
+        line = line.rstrip('\n')
+        filematch = re.match(OPEN + "file:([^>]+)" + CLOSE, line)
+        match = re.match(OPEN + "([^>]+)" + CLOSE + "=", line)
+        if filematch:
+            parseFile(filematch.group(1), chunks)
+        elif match:
+            chunkName = match.group(1)
+            chunks[chunkName] = []
+        else:
+            match = re.match("@", line)
+            if match:
+                chunkName = None
+            elif chunkName:
+                chunks[chunkName].append(line)
+    file.close()
+
+def expandFile(filename, chunks, outputChunkName):
+    parseFile(filename, chunks)
+
+    return expand(outputChunkName, chunks, "")
+
+def usage():
+    print "noweb.py -Routchunk infile > outfile"
+
+def main():
+    if len(sys.argv) < 3:
+        usage()
+        
+    chunks = {}
+    for l in expandFile(sys.argv[-1], chunks, sys.argv[-2][2:]):
+        print l
+    
+if __name__ == "__main__":
+    main()