view mercurial/color.py @ 32009:c6cb21ddf74a

checkheads: upgrade the obsolescence postprocessing logic (issue4354)

The previous logic had many shortcoming (eg: looking at the head only, not
handling prune, etc...), the new logic use a more robust approach:

For each head, we check if after the push all changesets exclusive to this heads
will be obsolete. If they are, the branch considered be "replaced".

To check if a changeset will be obsolete, we simply checks:

* the changeset phase

* the existence of a marker relevant to the "pushed set" that affects the
  changesets..

This fixes two major issues of the previous algorithm:

* branch partially rewritten (eg: head but not root) are no longer detected as
  replaced,

* Prune are now properly handled.

(This implementation was introduction in the evolve extension, version 6.0.0.)

This new algorithm has an extended number of tests, a basic one is provided
in this patch. The others will be introduced in their own changeset for clarity.

In addition, we stop trying to process heads unknown locally, we do not have
enough data to take an informed decision so we should stop pretending we do.
This reflect a test that is now update.

# utility for color output for Mercurial commands
#
# Copyright (C) 2007 Kevin Christen <[e-mail]> and other
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

from __future__ import absolute_import

import re

from .i18n import _

from . import (
    encoding,
    pycompat,
    util
)

try:
    import curses
    # Mapping from effect name to terminfo attribute name (or raw code) or
    # color number.  This will also force-load the curses module.
    _baseterminfoparams = {
        'none': (True, 'sgr0', ''),
        'standout': (True, 'smso', ''),
        'underline': (True, 'smul', ''),
        'reverse': (True, 'rev', ''),
        'inverse': (True, 'rev', ''),
        'blink': (True, 'blink', ''),
        'dim': (True, 'dim', ''),
        'bold': (True, 'bold', ''),
        'invisible': (True, 'invis', ''),
        'italic': (True, 'sitm', ''),
        'black': (False, curses.COLOR_BLACK, ''),
        'red': (False, curses.COLOR_RED, ''),
        'green': (False, curses.COLOR_GREEN, ''),
        'yellow': (False, curses.COLOR_YELLOW, ''),
        'blue': (False, curses.COLOR_BLUE, ''),
        'magenta': (False, curses.COLOR_MAGENTA, ''),
        'cyan': (False, curses.COLOR_CYAN, ''),
        'white': (False, curses.COLOR_WHITE, ''),
    }
except ImportError:
    curses = None
    _baseterminfoparams = {}

# allow the extensions to change the default
_enabledbydefault = False

# 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,
    'dim': 2,
    'black_background': 40,
    'red_background': 41,
    'green_background': 42,
    'yellow_background': 43,
    'blue_background': 44,
    'purple_background': 45,
    'cyan_background': 46,
    'white_background': 47,
    }

_defaultstyles = {
    'grep.match': 'red bold',
    'grep.linenumber': 'green',
    'grep.rev': 'green',
    'grep.change': 'green',
    'grep.sep': 'cyan',
    'grep.filename': 'magenta',
    'grep.user': 'magenta',
    'grep.date': 'magenta',
    'bookmarks.active': 'green',
    '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.tab': '',
    'diff.trailingwhitespace': 'bold red_background',
    'changeset.public' : '',
    'changeset.draft' : '',
    'changeset.secret' : '',
    'diffstat.deleted': 'red',
    'diffstat.inserted': 'green',
    'histedit.remaining': 'red bold',
    'ui.prompt': 'yellow',
    'log.changeset': 'yellow',
    'patchbomb.finalsummary': '',
    'patchbomb.from': 'magenta',
    'patchbomb.to': 'cyan',
    'patchbomb.subject': 'green',
    'patchbomb.diffstats': '',
    'rebase.rebased': 'blue',
    'rebase.remaining': 'red bold',
    'resolve.resolved': 'green bold',
    'resolve.unresolved': 'red bold',
    'shelve.age': 'cyan',
    'shelve.newest': 'green bold',
    'shelve.name': 'blue 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',
    'tags.normal': 'green',
    'tags.local': 'black bold',
}

def loadcolortable(ui, extname, colortable):
    _defaultstyles.update(colortable)

def _terminfosetup(ui, mode):
    '''Initialize terminfo data and the terminal if we're in terminfo mode.'''

    # If we failed to load curses, we go ahead and return.
    if curses is None:
        return
    # Otherwise, see what the config file says.
    if mode not in ('auto', 'terminfo'):
        return
    ui._terminfoparams.update(_baseterminfoparams)

    for key, val in ui.configitems('color'):
        if key.startswith('color.'):
            newval = (False, int(val), '')
            ui._terminfoparams[key[6:]] = newval
        elif key.startswith('terminfo.'):
            newval = (True, '', val.replace('\\E', '\x1b'))
            ui._terminfoparams[key[9:]] = newval
    try:
        curses.setupterm()
    except curses.error as e:
        ui._terminfoparams.clear()
        return

    for key, (b, e, c) in ui._terminfoparams.items():
        if not b:
            continue
        if not c and not curses.tigetstr(e):
            # Most terminals don't support dim, invis, etc, so don't be
            # noisy and use ui.debug().
            ui.debug("no terminfo entry for %s\n" % e)
            del ui._terminfoparams[key]
    if not curses.tigetstr('setaf') or not curses.tigetstr('setab'):
        # Only warn about missing terminfo entries if we explicitly asked for
        # terminfo mode.
        if mode == "terminfo":
            ui.warn(_("no terminfo entry for setab/setaf: reverting to "
              "ECMA-48 color\n"))
        ui._terminfoparams.clear()

def setup(ui):
    """configure color on a ui

    That function both set the colormode for the ui object and read
    the configuration looking for custom colors and effect definitions."""
    mode = _modesetup(ui)
    ui._colormode = mode
    if mode and mode != 'debug':
        configstyles(ui)

def _modesetup(ui):
    if ui.plain():
        return None
    default = 'never'
    if _enabledbydefault:
        default = 'auto'
    config = ui.config('ui', 'color', default)
    if config == 'debug':
        return 'debug'

    auto = (config == 'auto')
    always = not auto and util.parsebool(config)
    if not always and not auto:
        return None

    formatted = (always or (encoding.environ.get('TERM') != 'dumb'
                 and ui.formatted()))

    mode = ui.config('color', 'mode', 'auto')

    # If pager is active, color.pagermode overrides color.mode.
    if getattr(ui, 'pageractive', False):
        mode = ui.config('color', 'pagermode', mode)

    realmode = mode
    if mode == 'auto':
        if pycompat.osname == 'nt':
            term = encoding.environ.get('TERM')
            # TERM won't be defined in a vanilla cmd.exe environment.

            # UNIX-like environments on Windows such as Cygwin and MSYS will
            # set TERM. They appear to make a best effort attempt at setting it
            # to something appropriate. However, not all environments with TERM
            # defined support ANSI. Since "ansi" could result in terminal
            # gibberish, we error on the side of selecting "win32". However, if
            # w32effects is not defined, we almost certainly don't support
            # "win32", so don't even try.
            if (term and 'xterm' in term) or not w32effects:
                realmode = 'ansi'
            else:
                realmode = 'win32'
        else:
            realmode = 'ansi'

    def modewarn():
        # only warn if color.mode was explicitly set and we're in
        # a formatted terminal
        if mode == realmode and ui.formatted():
            ui.warn(_('warning: failed to set color mode to %s\n') % mode)

    if realmode == 'win32':
        ui._terminfoparams.clear()
        if not w32effects:
            modewarn()
            return None
    elif realmode == 'ansi':
        ui._terminfoparams.clear()
    elif realmode == 'terminfo':
        _terminfosetup(ui, mode)
        if not ui._terminfoparams:
            ## FIXME Shouldn't we return None in this case too?
            modewarn()
            realmode = 'ansi'
    else:
        return None

    if always or (auto and formatted):
        return realmode
    return None

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

def _activeeffects(ui):
    '''Return the effects map for the color mode set on the ui.'''
    if ui._colormode == 'win32':
        return w32effects
    elif ui._colormode is not None:
        return _effects
    return {}

def valideffect(ui, effect):
    'Determine if the effect is valid or not.'
    return ((not ui._terminfoparams and effect in _activeeffects(ui))
             or (effect in ui._terminfoparams
                 or effect[:-11] in ui._terminfoparams))

def _effect_str(ui, effect):
    '''Helper function for render_effects().'''

    bg = False
    if effect.endswith('_background'):
        bg = True
        effect = effect[:-11]
    try:
        attr, val, termcode = ui._terminfoparams[effect]
    except KeyError:
        return ''
    if attr:
        if termcode:
            return termcode
        else:
            return curses.tigetstr(val)
    elif bg:
        return curses.tparm(curses.tigetstr('setab'), val)
    else:
        return curses.tparm(curses.tigetstr('setaf'), val)

def _mergeeffects(text, start, stop):
    """Insert start sequence at every occurrence of stop sequence

    >>> s = _mergeeffects('cyan', '[C]', '|')
    >>> s = _mergeeffects(s + 'yellow', '[Y]', '|')
    >>> s = _mergeeffects('ma' + s + 'genta', '[M]', '|')
    >>> s = _mergeeffects('red' + s, '[R]', '|')
    >>> s
    '[R]red[M]ma[Y][C]cyan|[R][M][Y]yellow|[R][M]genta|'
    """
    parts = []
    for t in text.split(stop):
        if not t:
            continue
        parts.extend([start, t, stop])
    return ''.join(parts)

def _render_effects(ui, text, effects):
    'Wrap text in commands to turn on each effect.'
    if not text:
        return text
    if ui._terminfoparams:
        start = ''.join(_effect_str(ui, effect)
                        for effect in ['none'] + effects.split())
        stop = _effect_str(ui, 'none')
    else:
        activeeffects = _activeeffects(ui)
        start = [pycompat.bytestr(activeeffects[e])
                 for e in ['none'] + effects.split()]
        start = '\033[' + ';'.join(start) + 'm'
        stop = '\033[' + pycompat.bytestr(activeeffects['none']) + 'm'
    return _mergeeffects(text, start, stop)

_ansieffectre = re.compile(br'\x1b\[[0-9;]*m')

def stripeffects(text):
    """Strip ANSI control codes which could be inserted by colorlabel()"""
    return _ansieffectre.sub('', text)

def colorlabel(ui, msg, label):
    """add color control code according to the mode"""
    if ui._colormode == 'debug':
        if label and msg:
            if msg[-1] == '\n':
                msg = "[%s|%s]\n" % (label, msg[:-1])
            else:
                msg = "[%s|%s]" % (label, msg)
    elif ui._colormode is not None:
        effects = []
        for l in label.split():
            s = ui._styles.get(l, '')
            if s:
                effects.append(s)
            elif valideffect(ui, l):
                effects.append(l)
        effects = ' '.join(effects)
        if effects:
            msg = '\n'.join([_render_effects(ui, line, effects)
                             for line in msg.split('\n')])
    return msg

w32effects = None
if pycompat.osname == 'nt':
    import ctypes

    _kernel32 = ctypes.windll.kernel32

    _WORD = ctypes.c_ushort

    _INVALID_HANDLE_VALUE = -1

    class _COORD(ctypes.Structure):
        _fields_ = [('X', ctypes.c_short),
                    ('Y', ctypes.c_short)]

    class _SMALL_RECT(ctypes.Structure):
        _fields_ = [('Left', ctypes.c_short),
                    ('Top', ctypes.c_short),
                    ('Right', ctypes.c_short),
                    ('Bottom', ctypes.c_short)]

    class _CONSOLE_SCREEN_BUFFER_INFO(ctypes.Structure):
        _fields_ = [('dwSize', _COORD),
                    ('dwCursorPosition', _COORD),
                    ('wAttributes', _WORD),
                    ('srWindow', _SMALL_RECT),
                    ('dwMaximumWindowSize', _COORD)]

    _STD_OUTPUT_HANDLE = 0xfffffff5 # (DWORD)-11
    _STD_ERROR_HANDLE = 0xfffffff4  # (DWORD)-12

    _FOREGROUND_BLUE = 0x0001
    _FOREGROUND_GREEN = 0x0002
    _FOREGROUND_RED = 0x0004
    _FOREGROUND_INTENSITY = 0x0008

    _BACKGROUND_BLUE = 0x0010
    _BACKGROUND_GREEN = 0x0020
    _BACKGROUND_RED = 0x0040
    _BACKGROUND_INTENSITY = 0x0080

    _COMMON_LVB_REVERSE_VIDEO = 0x4000
    _COMMON_LVB_UNDERSCORE = 0x8000

    # http://msdn.microsoft.com/en-us/library/ms682088%28VS.85%29.aspx
    w32effects = {
        'none': -1,
        'black': 0,
        'red': _FOREGROUND_RED,
        'green': _FOREGROUND_GREEN,
        'yellow': _FOREGROUND_RED | _FOREGROUND_GREEN,
        'blue': _FOREGROUND_BLUE,
        'magenta': _FOREGROUND_BLUE | _FOREGROUND_RED,
        'cyan': _FOREGROUND_BLUE | _FOREGROUND_GREEN,
        'white': _FOREGROUND_RED | _FOREGROUND_GREEN | _FOREGROUND_BLUE,
        'bold': _FOREGROUND_INTENSITY,
        'black_background': 0x100,                  # unused value > 0x0f
        'red_background': _BACKGROUND_RED,
        'green_background': _BACKGROUND_GREEN,
        'yellow_background': _BACKGROUND_RED | _BACKGROUND_GREEN,
        'blue_background': _BACKGROUND_BLUE,
        'purple_background': _BACKGROUND_BLUE | _BACKGROUND_RED,
        'cyan_background': _BACKGROUND_BLUE | _BACKGROUND_GREEN,
        'white_background': (_BACKGROUND_RED | _BACKGROUND_GREEN |
                             _BACKGROUND_BLUE),
        'bold_background': _BACKGROUND_INTENSITY,
        'underline': _COMMON_LVB_UNDERSCORE,  # double-byte charsets only
        'inverse': _COMMON_LVB_REVERSE_VIDEO, # double-byte charsets only
    }

    passthrough = set([_FOREGROUND_INTENSITY,
                       _BACKGROUND_INTENSITY,
                       _COMMON_LVB_UNDERSCORE,
                       _COMMON_LVB_REVERSE_VIDEO])

    stdout = _kernel32.GetStdHandle(
                  _STD_OUTPUT_HANDLE)  # don't close the handle returned
    if stdout is None or stdout == _INVALID_HANDLE_VALUE:
        w32effects = None
    else:
        csbi = _CONSOLE_SCREEN_BUFFER_INFO()
        if not _kernel32.GetConsoleScreenBufferInfo(
                    stdout, ctypes.byref(csbi)):
            # stdout may not support GetConsoleScreenBufferInfo()
            # when called from subprocess or redirected
            w32effects = None
        else:
            origattr = csbi.wAttributes
            ansire = re.compile('\033\[([^m]*)m([^\033]*)(.*)',
                                re.MULTILINE | re.DOTALL)

    def win32print(ui, writefunc, *msgs, **opts):
        for text in msgs:
            _win32print(ui, text, writefunc, **opts)

    def _win32print(ui, text, writefunc, **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 = ui._styles.get(l, '')
            for effect in style.split():
                try:
                    attr = mapcolor(w32effects[effect], attr)
                except KeyError:
                    # w32effects could not have certain attributes so we skip
                    # them if not found
                    pass
        # 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)

        try:
            while m:
                for sattr in m.group(1).split(';'):
                    if sattr:
                        attr = mapcolor(int(sattr), attr)
                ui.flush()
                _kernel32.SetConsoleTextAttribute(stdout, attr)
                writefunc(m.group(2), **opts)
                m = re.match(ansire, m.group(3))
        finally:
            # Explicitly reset original attributes
            ui.flush()
            _kernel32.SetConsoleTextAttribute(stdout, origattr)