hgext/color.py

hgweb: use "nonempty" filter in templates for the changelog message

At least subversion allows empty commit logs which, after conversion,
show up as empty fields in hgweb and don't allow selecting the
changeset. Using "nonempty" as filter, "(none)" is used to get
clickable links for empty commit messages.

# color.py color output for the status and qseries commands
#
# Copyright (C) 2007 Kevin Christen <[e-mail]>
#
# 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.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

'''add color output to status, qseries, and diff-related commands

This extension modifies the status command to add color to its output
to reflect file status, the qseries command to add color to reflect
patch status (applied, unapplied, missing), and to diff-related
commands to highlight additions, removals, diff headers, and trailing
whitespace.

Other effects in addition to color, like bold and underlined text, are
also available. Effects are rendered with the ECMA-48 SGR control
function (aka ANSI escape codes). This module also provides the
render_text function, which can be used to add effects to any text.

To enable this extension, add this to your .hgrc file:
[extensions]
color =

Default effects my be overriden from the .hgrc file:

[color]
status.modified = blue bold underline red_background
status.added = green bold
status.removed = red bold blue_background
status.deleted = cyan bold underline
status.unknown = magenta bold underline
status.ignored = black bold

# 'none' turns off all effects
status.clean = none
status.copied = none

qseries.applied = blue bold underline
qseries.unapplied = black bold
qseries.missing = red bold

diff.diffline = bold
diff.extended = cyan bold
diff.file_a = red bold
diff.file_b = green bold
diff.hunk = magenta
diff.deleted = red
diff.inserted = green
diff.changed = white
diff.trailingwhitespace = bold red_background
'''

import os, re, sys

from mercurial import cmdutil, commands, extensions
from mercurial.i18n import _

# start and stop parameters for effects
_effect_params = {'none': 0,
                  'black': 30,
                  'red': 31,
                  'green': 32,
                  'yellow': 33,
                  'blue': 34,
                  'magenta': 35,
                  'cyan': 36,
                  'white': 37,
                  'bold': 1,
                  'italic': 3,
                  'underline': 4,
                  'inverse': 7,
                  'black_background': 40,
                  'red_background': 41,
                  'green_background': 42,
                  'yellow_background': 43,
                  'blue_background': 44,
                  'purple_background': 45,
                  'cyan_background': 46,
                  'white_background': 47}

def render_effects(text, *effects):
    'Wrap text in commands to turn on each effect.'
    start = [str(_effect_params[e]) for e in ('none',) + effects]
    start = '\033[' + ';'.join(start) + 'm'
    stop = '\033[' + str(_effect_params['none']) + 'm'
    return ''.join([start, text, stop])

def colorstatus(orig, ui, repo, *pats, **opts):
    '''run the status command with colored output'''

    delimiter = opts['print0'] and '\0' or '\n'

    nostatus = opts.get('no_status')
    opts['no_status'] = False
    # run status and capture its output
    ui.pushbuffer()
    retval = orig(ui, repo, *pats, **opts)
    # filter out empty strings
    lines_with_status = [ line for line in ui.popbuffer().split(delimiter) if line ]

    if nostatus:
        lines = [l[2:] for l in lines_with_status]
    else:
        lines = lines_with_status

    # apply color to output and display it
    for i in xrange(0, len(lines)):
        status = _status_abbreviations[lines_with_status[i][0]]
        effects = _status_effects[status]
        if effects:
            lines[i] = render_effects(lines[i], *effects)
        ui.write(lines[i] + delimiter)
    return retval

_status_abbreviations = { 'M': 'modified',
                          'A': 'added',
                          'R': 'removed',
                          '!': 'deleted',
                          '?': 'unknown',
                          'I': 'ignored',
                          'C': 'clean',
                          ' ': 'copied', }

_status_effects = { 'modified': ('blue', 'bold'),
                    'added': ('green', 'bold'),
                    'removed': ('red', 'bold'),
                    'deleted': ('cyan', 'bold', 'underline'),
                    'unknown': ('magenta', 'bold', 'underline'),
                    'ignored': ('black', 'bold'),
                    'clean': ('none', ),
                    'copied': ('none', ), }

def colorqseries(orig, ui, repo, *dummy, **opts):
    '''run the qseries command with colored output'''
    ui.pushbuffer()
    retval = orig(ui, repo, **opts)
    patches = ui.popbuffer().splitlines()
    for patch in patches:
        patchname = patch
        if opts['summary']:
            patchname = patchname.split(': ')[0]
        if ui.verbose:
            patchname = patchname.split(' ', 2)[-1]

        if opts['missing']:
            effects = _patch_effects['missing']
        # Determine if patch is applied.
        elif [ applied for applied in repo.mq.applied
               if patchname == applied.name ]:
            effects = _patch_effects['applied']
        else:
            effects = _patch_effects['unapplied']
        ui.write(render_effects(patch, *effects) + '\n')
    return retval

_patch_effects = { 'applied': ('blue', 'bold', 'underline'),
                   'missing': ('red', 'bold'),
                   'unapplied': ('black', 'bold'), }

def colorwrap(orig, s):
    '''wrap ui.write for colored diff output'''
    lines = s.split('\n')
    for i, line in enumerate(lines):
        stripline = line
        if line and line[0] in '+-':
            # highlight trailing whitespace, but only in changed lines
            stripline = line.rstrip()
        for prefix, style in _diff_prefixes:
            if stripline.startswith(prefix):
                lines[i] = render_effects(stripline, *_diff_effects[style])
                break
        if line != stripline:
            lines[i] += render_effects(
                line[len(stripline):], *_diff_effects['trailingwhitespace'])
    orig('\n'.join(lines))

def colorshowpatch(orig, self, node):
    '''wrap cmdutil.changeset_printer.showpatch with colored output'''
    oldwrite = extensions.wrapfunction(self.ui, 'write', colorwrap)
    try:
        orig(self, node)
    finally:
        self.ui.write = oldwrite

def colordiff(orig, ui, repo, *pats, **opts):
    '''run the diff command with colored output'''
    oldwrite = extensions.wrapfunction(ui, 'write', colorwrap)
    try:
        orig(ui, repo, *pats, **opts)
    finally:
        ui.write = oldwrite

_diff_prefixes = [('diff', 'diffline'),
                  ('copy', 'extended'),
                  ('rename', 'extended'),
                  ('old', 'extended'),
                  ('new', 'extended'),
                  ('deleted', 'extended'),
                  ('---', 'file_a'),
                  ('+++', 'file_b'),
                  ('@', 'hunk'),
                  ('-', 'deleted'),
                  ('+', 'inserted')]

_diff_effects = {'diffline': ('bold',),
                 'extended': ('cyan', 'bold'),
                 'file_a': ('red', 'bold'),
                 'file_b': ('green', 'bold'),
                 'hunk': ('magenta',),
                 'deleted': ('red',),
                 'inserted': ('green',),
                 'changed': ('white',),
                 'trailingwhitespace': ('bold', 'red_background'),}

def uisetup(ui):
    '''Initialize the extension.'''
    _setupcmd(ui, 'diff', commands.table, colordiff, _diff_effects)
    _setupcmd(ui, 'incoming', commands.table, None, _diff_effects)
    _setupcmd(ui, 'log', commands.table, None, _diff_effects)
    _setupcmd(ui, 'outgoing', commands.table, None, _diff_effects)
    _setupcmd(ui, 'tip', commands.table, None, _diff_effects)
    _setupcmd(ui, 'status', commands.table, colorstatus, _status_effects)
    if ui.config('extensions', 'hgext.mq') is not None or \
            ui.config('extensions', 'mq') is not None:
        from hgext import mq
        _setupcmd(ui, 'qdiff', mq.cmdtable, colordiff, _diff_effects)
        _setupcmd(ui, 'qseries', mq.cmdtable, colorqseries, _patch_effects)

def _setupcmd(ui, cmd, table, func, effectsmap):
    '''patch in command to command table and load effect map'''
    def nocolor(orig, *args, **opts):

        if (opts['no_color'] or opts['color'] == 'never' or
            (opts['color'] == 'auto' and (os.environ.get('TERM') == 'dumb'
                                          or not sys.__stdout__.isatty()))):
            return orig(*args, **opts)

        oldshowpatch = extensions.wrapfunction(cmdutil.changeset_printer,
                                               'showpatch', colorshowpatch)
        try:
            if func is not None:
                return func(orig, *args, **opts)
            return orig(*args, **opts)
        finally:
            cmdutil.changeset_printer.showpatch = oldshowpatch

    entry = extensions.wrapcommand(table, cmd, nocolor)
    entry[1].extend([
        ('', 'color', 'auto', _("when to colorize (always, auto, or never)")),
        ('', 'no-color', None, _("don't colorize output")),
    ])

    for status in effectsmap:
        effects = ui.config('color', cmd + '.' + status)
        if effects:
            effectsmap[status] = re.split('\W+', effects)