--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/upmana/mercurial/hook.py	Fri Oct 30 22:21:40 2009 -0500
@@ -0,0 +1,127 @@
+# hook.py - hook support for mercurial
+#
+# Copyright 2007 Matt Mackall <mpm@selenic.com>
+#
+# This software may be used and distributed according to the terms of the
+# GNU General Public License version 2, incorporated herein by reference.
+
+from i18n import _
+import os, sys
+import extensions, util
+
+def _pythonhook(ui, repo, name, hname, funcname, args, throw):
+    '''call python hook. hook is callable object, looked up as
+    name in python module. if callable returns "true", hook
+    fails, else passes. if hook raises exception, treated as
+    hook failure. exception propagates if throw is "true".
+
+    reason for "true" meaning "hook failed" is so that
+    unmodified commands (e.g. mercurial.commands.update) can
+    be run as hooks without wrappers to convert return values.'''
+
+    ui.note(_("calling hook %s: %s\n") % (hname, funcname))
+    obj = funcname
+    if not hasattr(obj, '__call__'):
+        d = funcname.rfind('.')
+        if d == -1:
+            raise util.Abort(_('%s hook is invalid ("%s" not in '
+                               'a module)') % (hname, funcname))
+        modname = funcname[:d]
+        try:
+            obj = __import__(modname)
+        except ImportError:
+            try:
+                # extensions are loaded with hgext_ prefix
+                obj = __import__("hgext_%s" % modname)
+            except ImportError:
+                raise util.Abort(_('%s hook is invalid '
+                                   '(import of "%s" failed)') %
+                                 (hname, modname))
+        try:
+            for p in funcname.split('.')[1:]:
+                obj = getattr(obj, p)
+        except AttributeError:
+            raise util.Abort(_('%s hook is invalid '
+                               '("%s" is not defined)') %
+                             (hname, funcname))
+        if not hasattr(obj, '__call__'):
+            raise util.Abort(_('%s hook is invalid '
+                               '("%s" is not callable)') %
+                             (hname, funcname))
+    try:
+        r = obj(ui=ui, repo=repo, hooktype=name, **args)
+    except KeyboardInterrupt:
+        raise
+    except Exception, exc:
+        if isinstance(exc, util.Abort):
+            ui.warn(_('error: %s hook failed: %s\n') %
+                         (hname, exc.args[0]))
+        else:
+            ui.warn(_('error: %s hook raised an exception: '
+                           '%s\n') % (hname, exc))
+        if throw:
+            raise
+        ui.traceback()
+        return True
+    if r:
+        if throw:
+            raise util.Abort(_('%s hook failed') % hname)
+        ui.warn(_('warning: %s hook failed\n') % hname)
+    return r
+
+def _exthook(ui, repo, name, cmd, args, throw):
+    ui.note(_("running hook %s: %s\n") % (name, cmd))
+
+    env = {}
+    for k, v in args.iteritems():
+        if hasattr(v, '__call__'):
+            v = v()
+        env['HG_' + k.upper()] = v
+
+    if repo:
+        cwd = repo.root
+    else:
+        cwd = os.getcwd()
+    r = util.system(cmd, environ=env, cwd=cwd)
+    if r:
+        desc, r = util.explain_exit(r)
+        if throw:
+            raise util.Abort(_('%s hook %s') % (name, desc))
+        ui.warn(_('warning: %s hook %s\n') % (name, desc))
+    return r
+
+_redirect = False
+def redirect(state):
+    global _redirect
+    _redirect = state
+
+def hook(ui, repo, name, throw=False, **args):
+    r = False
+
+    if _redirect:
+        # temporarily redirect stdout to stderr
+        oldstdout = os.dup(sys.__stdout__.fileno())
+        os.dup2(sys.__stderr__.fileno(), sys.__stdout__.fileno())
+
+    try:
+        for hname, cmd in ui.configitems('hooks'):
+            if hname.split('.')[0] != name or not cmd:
+                continue
+            if hasattr(cmd, '__call__'):
+                r = _pythonhook(ui, repo, name, hname, cmd, args, throw) or r
+            elif cmd.startswith('python:'):
+                if cmd.count(':') == 2:
+                    path, cmd = cmd[7:].split(':')
+                    mod = extensions.loadpath(path, 'hgkook.%s' % hname)
+                    hookfn = getattr(mod, cmd)
+                else:
+                    hookfn = cmd[7:].strip()
+                r = _pythonhook(ui, repo, name, hname, hookfn, args, throw) or r
+            else:
+                r = _exthook(ui, repo, hname, cmd, args, throw) or r
+    finally:
+        if _redirect:
+            os.dup2(oldstdout, sys.__stdout__.fileno())
+            os.close(oldstdout)
+
+    return r