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−#!/usr/bin/env python
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−#
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−# Mercurial hook to check for inappropriate whitespace.  Currently it
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−# only checks Python files.
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−#
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−# This script is based on the code in the Mercurial book
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−# <http://hgbook.red-bean.com/read/handling-repository-events-with-hooks.html#id403945>
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−
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−'''hook to refuse commits that introduce some bad inputs.
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−Inputs that are refused are conflict markers (rows of < or >
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−characters), and tabs and trailing white space in Python sources.
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−
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−Usage: in your ~/.hgrc file add:
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−[hooks]
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−pretxncommit.whitespace = python:/path/to/check_whitespace.py:hook
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−pretxnchangegroup.whitespace = python:/path/to/check_whitespace.py:hook
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−'''
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−
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−import re
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−import os
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−
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−binary_suffixes = (
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−    '.bam',
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−    '.bmp',
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−    '.bz2',
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−    '.chm',
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−    '.cpl',
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−    '.dia',
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−    '.dll',
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−    '.gz',
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−    '.ico',
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−    '.pdf',
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−    '.png',
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−    '.rtf',
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−    '.zip',
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−)
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−
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−def trailing_whitespace(difflines):
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−    linenum = 0
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−    header = False
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−    filename = ''
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−    fnre = re.compile(br'(?:---|\+\+\+) (?P<filename>[^\t\r\n]+)')
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−    lnre = re.compile(br'@@ -\d+,\d+ \+(?P<lineno>\d+),')
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−    wsre = re.compile(br'\+.*[ \t]$')
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−    tbre = re.compile(br'\+.*\t')
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−    resre = re.compile(br'\+(<<<<<<<|>>>>>>>|======= end)')
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−    adding = False
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−    islink = False              # symlinks can have no newline at end
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−
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−    for chunk in difflines:
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−        for line in chunk.split(b'\n'):
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−            if header:
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−                if line.startswith(b'new file mode'):
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−                    islink = b'120000' in line
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−                # remember the name of the file that this diff affects
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−                m = fnre.match(line)
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−                if m is not None and m.group('filename') != b'/dev/null':
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−                    filename = m.group('filename').split(b'/', 1)[-1]
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−                if line.startswith(b'+++ '):
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−                    header = False
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−                continue
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−            if line.startswith(b'diff '):
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−                header = True
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−                adding = False
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−                islink = False
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−                continue
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−            # hunk header - save the line number
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−            m = lnre.match(line)
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−            if m is not None:
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−                linenum = int(m.group('lineno'))
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−                continue
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−            if header or not filename:
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−                continue
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−            if line[:1] == b'+':
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−                adding = True
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−            elif line[:1] in (b' ', b'-'):
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−                adding = False
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−            elif adding \
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−                 and not islink \
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−                 and line.startswith(br'\ No newline at end of file') \
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−                 and not filename.endswith(b'vertoo.data') \
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−                 and not os.path.splitext(filename)[1] in binary_suffixes:
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−                adding = False
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−                yield filename, linenum, b'no newline at end of file'
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−            # hunk body - check for an added line with bad whitespace
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−            if filename[-3:] == b'.py' or filename[-5:] == b'.py.in':
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−                m = tbre.match(line)
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−                if m is not None:
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−                    yield filename, linenum, b'TABs'
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−            # trailing whitespace, for now only in Python source
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−            m = wsre.match(line)
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−            if m is not None:
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−                if filename[-3:] == b'.py' or filename[-5:] == b'.py.in':
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−                    yield filename, linenum, b'trailing whitespace'
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−            # conflict markers
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−            m = resre.match(line)
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−            if m is not None:
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−                yield filename, linenum, b'conflict marker'
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−            if line and line[0] in b' +':
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−                linenum += 1
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−
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−def hook(ui, repo, hooktype, node=None, source=None, **kwargs):
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−    import os, sys, subprocess
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−    if hooktype not in [b'pretxnchangegroup', b'pretxncommit']:
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−        ui.write(b'Hook should be pretxncommit/pretxnchangegroup not "%s".' % hooktype)
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−        return 1
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−    added = False
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−    branches = {}
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−    for rev in range(repo[node].rev(), len(repo)):
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−        branch = repo[rev].branch()
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−        if branch not in branches:
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−            # first time we see this branch, remember parents to diff against
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−            branches[branch] = repo[rev].parents()
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−        desc = 0
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−        for d in repo[rev].descendants():
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−            break
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−        else:
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−            # no descendants for this revision, check diff with saved parents
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−            for p in branches[branch]:
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−                for filename, linenum, msg in trailing_whitespace(repo[rev].diff(p)):
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−                    ui.write('%s, line %d, branch %s: %s added\n' % (filename, linenum, branch, msg))
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−                    added = True
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−    if added:
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−        # save the commit message so we don't need to retype it
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−        if source != 'serve':
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−            cmtsv = os.path.join('.hg','commit.save')
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−            subprocess.call(['hg', 'tip', '--template', '{desc}'],
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−                            stdout=open(cmtsv, 'w'))
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−            ui.write('commit message saved to %s\n' % cmtsv)
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−        return 1
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−
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−if __name__ == '__main__':
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−    import sys
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−    sys.stderr.write('call this hook using the Python interface.\n'
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−                     'In your .hgrc file you should have:\n'
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−                     'pretxncommit.whitespace = python:<path-to-check_whitespace-directory>/check_whitespace.py:hook\n')
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−
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−    sys.exit(1)