hgext/color.py

checknlink: return False if .hgtmp file preexists (issue2517)

If os_link fails on Windows, errno is always errno.EINVAL,
so we can't really say if the testlink could not be created
because (a) the FS doesn't support hardlinks or (b) there
is a leaked .hgtmp file lying around from a previous crashed
run.

So let's err on the safe side, keep the code simple and assume
we can't detect hardlinks in both cases.

# 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.

'''colorize output from some commands

This extension modifies the status and resolve commands to add color to their
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.

Default effects may be overridden from your configuration 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

  resolve.unresolved = red bold
  resolve.resolved = green bold

  bookmarks.current = green

  branches.active = none
  branches.closed = black bold
  branches.current = green
  branches.inactive = none

The color extension will try to detect whether to use ANSI codes or
Win32 console APIs, unless it is made explicit::

  [color]
  mode = ansi

Any value other than 'ansi', 'win32', or 'auto' will disable color.

'''

import os

from mercurial import commands, dispatch, extensions, ui as uimod, util
from mercurial.i18n import _

# start and stop parameters for effects
_effects = {'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}

_styles = {'grep.match': 'red bold',
           'branches.active': 'none',
           'branches.closed': 'black bold',
           'branches.current': 'green',
           'branches.inactive': 'none',
           'diff.changed': 'white',
           'diff.deleted': 'red',
           'diff.diffline': 'bold',
           'diff.extended': 'cyan bold',
           'diff.file_a': 'red bold',
           'diff.file_b': 'green bold',
           'diff.hunk': 'magenta',
           'diff.inserted': 'green',
           'diff.trailingwhitespace': 'bold red_background',
           'diffstat.deleted': 'red',
           'diffstat.inserted': 'green',
           'log.changeset': 'yellow',
           'resolve.resolved': 'green bold',
           'resolve.unresolved': 'red bold',
           'status.added': 'green bold',
           'status.clean': 'none',
           'status.copied': 'none',
           'status.deleted': 'cyan bold underline',
           'status.ignored': 'black bold',
           'status.modified': 'blue bold',
           'status.removed': 'red bold',
           'status.unknown': 'magenta bold underline'}


def render_effects(text, effects):
    'Wrap text in commands to turn on each effect.'
    if not text:
        return text
    start = [str(_effects[e]) for e in ['none'] + effects.split()]
    start = '\033[' + ';'.join(start) + 'm'
    stop = '\033[' + str(_effects['none']) + 'm'
    return ''.join([start, text, stop])

def extstyles():
    for name, ext in extensions.extensions():
        _styles.update(getattr(ext, 'colortable', {}))

def configstyles(ui):
    for status, cfgeffects in ui.configitems('color'):
        if '.' not in status:
            continue
        cfgeffects = ui.configlist('color', status)
        if cfgeffects:
            good = []
            for e in cfgeffects:
                if e in _effects:
                    good.append(e)
                else:
                    ui.warn(_("ignoring unknown color/effect %r "
                              "(configured in color.%s)\n")
                            % (e, status))
            _styles[status] = ' '.join(good)

class colorui(uimod.ui):
    def popbuffer(self, labeled=False):
        if labeled:
            return ''.join(self.label(a, label) for a, label
                           in self._buffers.pop())
        return ''.join(a for a, label in self._buffers.pop())

    _colormode = 'ansi'
    def write(self, *args, **opts):
        label = opts.get('label', '')
        if self._buffers:
            self._buffers[-1].extend([(str(a), label) for a in args])
        elif self._colormode == 'win32':
            for a in args:
                win32print(a, super(colorui, self).write, **opts)
        else:
            return super(colorui, self).write(
                *[self.label(str(a), label) for a in args], **opts)

    def write_err(self, *args, **opts):
        label = opts.get('label', '')
        if self._colormode == 'win32':
            for a in args:
                win32print(a, super(colorui, self).write_err, **opts)
        else:
            return super(colorui, self).write_err(
                *[self.label(str(a), label) for a in args], **opts)

    def label(self, msg, label):
        effects = []
        for l in label.split():
            s = _styles.get(l, '')
            if s:
                effects.append(s)
        effects = ''.join(effects)
        if effects:
            return '\n'.join([render_effects(s, effects)
                              for s in msg.split('\n')])
        return msg


def uisetup(ui):
    if ui.plain():
        return
    mode = ui.config('color', 'mode', 'auto')
    if mode == 'auto':
        if os.name == 'nt' and 'TERM' not in os.environ:
            # looks line a cmd.exe console, use win32 API or nothing
            mode = w32effects and 'win32' or 'none'
        else:
            mode = 'ansi'
    if mode == 'win32':
        if w32effects is None:
            # only warn if color.mode is explicitly set to win32
            ui.warn(_('win32console not found, please install pywin32\n'))
            return
        _effects.update(w32effects)
    elif mode != 'ansi':
        return
    def colorcmd(orig, ui_, opts, cmd, cmdfunc):
        coloropt = opts['color']
        auto = coloropt == 'auto'
        always = util.parsebool(coloropt)
        if (always or
            (always is None and
             (auto and (os.environ.get('TERM') != 'dumb' and ui_.formatted())))):
            colorui._colormode = mode
            colorui.__bases__ = (ui_.__class__,)
            ui_.__class__ = colorui
            extstyles()
            configstyles(ui_)
        return orig(ui_, opts, cmd, cmdfunc)
    extensions.wrapfunction(dispatch, '_runcommand', colorcmd)

def extsetup(ui):
    commands.globalopts.append(
        ('', 'color', 'auto',
         # i18n: 'always', 'auto', and 'never' are keywords and should
         # not be translated
         _("when to colorize (boolean, always, auto, or never)"),
         _('TYPE')))

try:
    import re, pywintypes, win32console as win32c

    # http://msdn.microsoft.com/en-us/library/ms682088%28VS.85%29.aspx
    w32effects = {
        'none': -1,
        'black': 0,
        'red': win32c.FOREGROUND_RED,
        'green': win32c.FOREGROUND_GREEN,
        'yellow': win32c.FOREGROUND_RED | win32c.FOREGROUND_GREEN,
        'blue': win32c.FOREGROUND_BLUE,
        'magenta': win32c.FOREGROUND_BLUE | win32c.FOREGROUND_RED,
        'cyan': win32c.FOREGROUND_BLUE | win32c.FOREGROUND_GREEN,
        'white': (win32c.FOREGROUND_RED | win32c.FOREGROUND_GREEN |
                  win32c.FOREGROUND_BLUE),
        'bold': win32c.FOREGROUND_INTENSITY,
        'black_background': 0x100,                  # unused value > 0x0f
        'red_background': win32c.BACKGROUND_RED,
        'green_background': win32c.BACKGROUND_GREEN,
        'yellow_background': win32c.BACKGROUND_RED | win32c.BACKGROUND_GREEN,
        'blue_background': win32c.BACKGROUND_BLUE,
        'purple_background': win32c.BACKGROUND_BLUE | win32c.BACKGROUND_RED,
        'cyan_background': win32c.BACKGROUND_BLUE | win32c.BACKGROUND_GREEN,
        'white_background': (win32c.BACKGROUND_RED | win32c.BACKGROUND_GREEN |
                             win32c.BACKGROUND_BLUE),
        'bold_background': win32c.BACKGROUND_INTENSITY,
        'underline': win32c.COMMON_LVB_UNDERSCORE,  # double-byte charsets only
        'inverse': win32c.COMMON_LVB_REVERSE_VIDEO, # double-byte charsets only
    }

    passthrough = set([win32c.FOREGROUND_INTENSITY,
                       win32c.BACKGROUND_INTENSITY,
                       win32c.COMMON_LVB_UNDERSCORE,
                       win32c.COMMON_LVB_REVERSE_VIDEO])

    try:
        stdout = win32c.GetStdHandle(win32c.STD_OUTPUT_HANDLE)
        if stdout is None:
            raise ImportError()
        origattr = stdout.GetConsoleScreenBufferInfo()['Attributes']
    except pywintypes.error:
        # stdout may be defined but not support
        # GetConsoleScreenBufferInfo(), when called from subprocess or
        # redirected.
        raise ImportError()
    ansire = re.compile('\033\[([^m]*)m([^\033]*)(.*)', re.MULTILINE | re.DOTALL)

    def win32print(text, orig, **opts):
        label = opts.get('label', '')
        attr = origattr

        def mapcolor(val, attr):
            if val == -1:
                return origattr
            elif val in passthrough:
                return attr | val
            elif val > 0x0f:
                return (val & 0x70) | (attr & 0x8f)
            else:
                return (val & 0x07) | (attr & 0xf8)

        # determine console attributes based on labels
        for l in label.split():
            style = _styles.get(l, '')
            for effect in style.split():
                attr = mapcolor(w32effects[effect], attr)

        # hack to ensure regexp finds data
        if not text.startswith('\033['):
            text = '\033[m' + text

        # Look for ANSI-like codes embedded in text
        m = re.match(ansire, text)
        while m:
            for sattr in m.group(1).split(';'):
                if sattr:
                    attr = mapcolor(int(sattr), attr)
            stdout.SetConsoleTextAttribute(attr)
            orig(m.group(2), **opts)
            m = re.match(ansire, m.group(3))

        # Explicity reset original attributes
        stdout.SetConsoleTextAttribute(origattr)

except ImportError:
    w32effects = None