hgchangelog /

# -*- coding: utf-8 -*-

    Mercurial extension to read commit message from changelog.

    :copyright: 2008 by Georg Brandl.
    :license: BSD.

from mercurial import commands, cmdutil, extensions, patch

def new_commit(orig_commit, ui, repo, *pats, **opts):
    if opts['message'] or opts['logfile']:
        # don't act if user already specified a message
        return orig_commit(ui, repo, *pats, **opts)

    # check if changelog changed
    logname = ui.config('changelog', 'filename', 'CHANGES')
    match = cmdutil.match(repo, pats, opts)
    if logname not in match:
        # changelog did not change
        return orig_commit(ui, repo, *pats, **opts)
    logmatch = cmdutil.match(repo, [logname], {})
    # get diff of changelog
    log = []
    for chunk in patch.diff(repo, None, None, match=logmatch):
        for line in chunk.splitlines():
            # naive: all added lines are the changelog
            if line.startswith('+') and not line.startswith('+++'):
                line = line[1:].strip()
                if line: log.append(line)
    log = '\n'.join(log)
    # strip bullet points and whitespace on the left
    log = log.lstrip('*- \t')
    opts['force_editor'] = True
    opts['message'] = log
    return orig_commit(ui, repo, *pats, **opts)

def uisetup(ui):
    if not hasattr(extensions, 'wrapcommand'):
    extensions.wrapcommand(commands.table, 'commit', new_commit)