bos@44: #!/usr/bin/python
bos@44: 
bos@49: import re
bos@44: 
bos@49: def trailing_whitespace(difflines):
bos@49:     added, linenum, header = [], 0, False
bos@44: 
bos@49:     for line in difflines:
bos@49:         if header:
bos@65:             # remember the name of the file that this diff affects
bos@65:             m = re.match(r'(?:---|\+\+\+) ([^\t]+)', line)
bos@65:             if m and m.group(1) != '/dev/null':
bos@65:                 filename = m.group(1).split('/', 1)[-1]
bos@49:             if line.startswith('+++ '):
bos@49:                 header = False
bos@49:             continue
bos@49:         if line.startswith('diff '):
bos@49:             header = True
bos@49:             continue
bos@49:         # hunk header - save the line number
bos@65:         m = re.match(r'@@ -\d+,\d+ \+(\d+),', line)
bos@49:         if m:
bos@49:             linenum = int(m.group(1))
bos@49:             continue
bos@49:         # hunk body - check for an added line with trailing whitespace
bos@49:         m = re.match(r'\+.*\s$', line)
bos@49:         if m:
bos@49:             added.append((filename, linenum))
bos@49:         if line and line[0] in ' +':
bos@49:             linenum += 1
bos@49:     return added
bos@44: 
bos@49: if __name__ == '__main__':
bos@49:     import os, sys
bos@49:     
bos@49:     added = trailing_whitespace(os.popen('hg export tip'))
bos@49:     if added:
bos@49:         for filename, linenum in added:
bos@49:             print >> sys.stderr, ('%s, line %d: trailing whitespace added' %
bos@49:                                   (filename, linenum))
bos@49:         # save the commit message so we don't need to retype it
bos@49:         os.system('hg tip --template "{desc}" > .hg/commit.save')
bos@49:         print >> sys.stderr, 'commit message saved to .hg/commit.save'
bos@49:         sys.exit(1)