color: accept usual boolean values as synonyms for always and never

hgext/color.py

@@ -79,7 +79,7 b" Any value other than 'ansi', 'win32', or"
 
 import os
 
-from mercurial import commands, dispatch, extensions, ui as uimod
+from mercurial import commands, dispatch, extensions, ui as uimod, util
 from mercurial.i18n import _
 
 # start and stop parameters for effects
@@ -209,9 +209,12 b' def uisetup(ui):'
     elif mode != 'ansi':
         return
     def colorcmd(orig, ui_, opts, cmd, cmdfunc):
-        if (opts['color'] == 'always' or
-            (opts['color'] == 'auto' and (os.environ.get('TERM') != 'dumb'
-                                          and ui_.formatted()))):
+        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
@@ -220,9 +223,10 b' def uisetup(ui):'
         return orig(ui_, opts, cmd, cmdfunc)
     extensions.wrapfunction(dispatch, '_runcommand', colorcmd)
 
-commands.globalopts.append(('', 'color', 'auto',
-                            _("when to colorize (always, auto, or never)"),
-                            _('TYPE')))
+commands.globalopts.append(
+    ('', 'color', 'auto',
+     _("when to colorize (boolean, always, auto, or never)"),
+     _('TYPE')))
 
 try:
     import re, pywintypes, win32console as win32c