# dispatch.py - command dispatching for mercurial

#

# Copyright 2005-2007 Matt Mackall <mpm@selenic.com>

#

# This software may be used and distributed according to the terms of the

# GNU General Public License version 2 or any later version.

from i18n import _

import os, sys, atexit, signal, pdb, socket, errno, shlex, time, traceback, re

import util, commands, hg, fancyopts, extensions, hook, error

import cmdutil, encoding

import ui as uimod

def run():

    "run the command in sys.argv"

    sys.exit(dispatch(sys.argv[1:]))

def dispatch(args):

    "run the command specified in args"

    try:

        u = uimod.ui()

        if '--traceback' in args:

            u.setconfig('ui', 'traceback', 'on')

    except util.Abort, inst:

        sys.stderr.write(_("abort: %s\n") % inst)

        if inst.hint:

            sys.stderr.write("(%s)\n" % inst.hint)

        return -1

    except error.ParseError, inst:

        if len(inst.args) > 1:

            sys.stderr.write(_("hg: parse error at %s: %s\n") %

                             (inst.args[1], inst.args[0]))

        else:

            sys.stderr.write(_("hg: parse error: %s\n") % inst.args[0])

        return -1

    return _runcatch(u, args)

def _runcatch(ui, args):

    def catchterm(*args):

        raise error.SignalInterrupt

    try:

        for name in 'SIGBREAK', 'SIGHUP', 'SIGTERM':

            num = getattr(signal, name, None)

            if num:

                signal.signal(num, catchterm)

    except ValueError:

        pass # happens if called in a thread

    try:

        try:

            # enter the debugger before command execution

            if '--debugger' in args:

                ui.warn(_("entering debugger - "

                        "type c to continue starting hg or h for help\n"))

                pdb.set_trace()

            try:

                return _dispatch(ui, args)

            finally:

                ui.flush()

        except:

            # enter the debugger when we hit an exception

            if '--debugger' in args:

                traceback.print_exc()

                pdb.post_mortem(sys.exc_info()[2])

            ui.traceback()

            raise

    # Global exception handling, alphabetically

    # Mercurial-specific first, followed by built-in and library exceptions

    except error.AmbiguousCommand, inst:

        ui.warn(_("hg: command '%s' is ambiguous:\n    %s\n") %

                (inst.args[0], " ".join(inst.args[1])))

    except error.ParseError, inst:

        if len(inst.args) > 1:

            ui.warn(_("hg: parse error at %s: %s\n") %

                             (inst.args[1], inst.args[0]))

        else:

            ui.warn(_("hg: parse error: %s\n") % inst.args[0])

        return -1

    except error.LockHeld, inst:

        if inst.errno == errno.ETIMEDOUT:

            reason = _('timed out waiting for lock held by %s') % inst.locker

        else:

            reason = _('lock held by %s') % inst.locker

        ui.warn(_("abort: %s: %s\n") % (inst.desc or inst.filename, reason))

    except error.LockUnavailable, inst:

        ui.warn(_("abort: could not lock %s: %s\n") %

               (inst.desc or inst.filename, inst.strerror))

    except error.CommandError, inst:

        if inst.args[0]:

            ui.warn(_("hg %s: %s\n") % (inst.args[0], inst.args[1]))

            commands.help_(ui, inst.args[0])

        else:

            ui.warn(_("hg: %s\n") % inst.args[1])

            commands.help_(ui, 'shortlist')

    except error.RepoError, inst:

        ui.warn(_("abort: %s!\n") % inst)

    except error.ResponseError, inst:

        ui.warn(_("abort: %s") % inst.args[0])

        if not isinstance(inst.args[1], basestring):

            ui.warn(" %r\n" % (inst.args[1],))

        elif not inst.args[1]:

            ui.warn(_(" empty string\n"))

        else:

            ui.warn("\n%r\n" % util.ellipsis(inst.args[1]))

    except error.RevlogError, inst:

        ui.warn(_("abort: %s!\n") % inst)

    except error.SignalInterrupt:

        ui.warn(_("killed!\n"))

    except error.UnknownCommand, inst:

        ui.warn(_("hg: unknown command '%s'\n") % inst.args[0])

        try:

            # check if the command is in a disabled extension

            # (but don't check for extensions themselves)

            commands.help_(ui, inst.args[0], unknowncmd=True)

        except error.UnknownCommand:

            commands.help_(ui, 'shortlist')

    except util.Abort, inst:

        ui.warn(_("abort: %s\n") % inst)

        if inst.hint:

            ui.warn(_("(%s)\n") % inst.hint)

    except ImportError, inst:

        ui.warn(_("abort: %s!\n") % inst)

        m = str(inst).split()[-1]

        if m in "mpatch bdiff".split():

            ui.warn(_("(did you forget to compile extensions?)\n"))

        elif m in "zlib".split():

            ui.warn(_("(is your Python install correct?)\n"))

    except IOError, inst:

        if hasattr(inst, "code"):

            ui.warn(_("abort: %s\n") % inst)

        elif hasattr(inst, "reason"):

            try: # usually it is in the form (errno, strerror)

                reason = inst.reason.args[1]

            except: # it might be anything, for example a string

                reason = inst.reason

            ui.warn(_("abort: error: %s\n") % reason)

        elif hasattr(inst, "args") and inst.args[0] == errno.EPIPE:

            if ui.debugflag:

                ui.warn(_("broken pipe\n"))

        elif getattr(inst, "strerror", None):

            if getattr(inst, "filename", None):

                ui.warn(_("abort: %s: %s\n") % (inst.strerror, inst.filename))

            else:

                ui.warn(_("abort: %s\n") % inst.strerror)

        else:

            raise

    except OSError, inst:

        if getattr(inst, "filename", None):

            ui.warn(_("abort: %s: %s\n") % (inst.strerror, inst.filename))

        else:

            ui.warn(_("abort: %s\n") % inst.strerror)

    except KeyboardInterrupt:

        try:

            ui.warn(_("interrupted!\n"))

        except IOError, inst:

            if inst.errno == errno.EPIPE:

                if ui.debugflag:

                    ui.warn(_("\nbroken pipe\n"))

            else:

                raise

    except MemoryError:

        ui.warn(_("abort: out of memory\n"))

    except SystemExit, inst:

        # Commands shouldn't sys.exit directly, but give a return code.

        # Just in case catch this and and pass exit code to caller.

        return inst.code

    except socket.error, inst:

        ui.warn(_("abort: %s\n") % inst.args[-1])

    except:

        ui.warn(_("** unknown exception encountered, details follow\n"))

        ui.warn(_("** report bug details to "

                 "http://mercurial.selenic.com/bts/\n"))

        ui.warn(_("** or mercurial@selenic.com\n"))

        ui.warn(_("** Python %s\n") % sys.version.replace('\n', ''))

        ui.warn(_("** Mercurial Distributed SCM (version %s)\n")

               % util.version())

        ui.warn(_("** Extensions loaded: %s\n")

               % ", ".join([x[0] for x in extensions.extensions()]))

        raise

    return -1

def aliasargs(fn):

    if hasattr(fn, 'args'):

        return fn.args

    return []

class cmdalias(object):

    def __init__(self, name, definition, cmdtable):

        self.name = self.cmd = name

        self.cmdname = ''

        self.definition = definition

        self.args = []

        self.opts = []

        self.help = ''

        self.norepo = True

        self.badalias = False

        try:

            aliases, entry = cmdutil.findcmd(self.name, cmdtable)

            for alias, e in cmdtable.iteritems():

                if e is entry:

                    self.cmd = alias

                    break

            self.shadows = True

        except error.UnknownCommand:

            self.shadows = False

        if not self.definition:

            def fn(ui, *args):

                ui.warn(_("no definition for alias '%s'\n") % self.name)

                return 1

            self.fn = fn

            self.badalias = True

            return

        if self.definition.startswith('!'):

            def fn(ui, *args):

                env = {'HG_ARGS': ' '.join((self.name,) + args)}

                def _checkvar(m):

                    if int(m.groups()[0]) <= len(args):

                        return m.group()

                    else:

                        return ''

                cmd = re.sub(r'\$(\d+)', _checkvar, self.definition[1:])

                replace = dict((str(i + 1), arg) for i, arg in enumerate(args))

                replace['0'] = self.name

                replace['@'] = ' '.join(args)

                cmd = util.interpolate(r'\$', replace, cmd)

                return util.system(cmd, environ=env)

            self.fn = fn

            return

        args = shlex.split(self.definition)

        self.cmdname = cmd = args.pop(0)

        args = map(util.expandpath, args)

        for invalidarg in ("--cwd", "-R", "--repository", "--repo"):

            if _earlygetopt([invalidarg], args):

                def fn(ui, *args):

                    ui.warn(_("error in definition for alias '%s': %s may only "

                              "be given on the command line\n")

                            % (self.name, invalidarg))

                    return 1

                self.fn = fn

                self.badalias = True

                return

        try:

            tableentry = cmdutil.findcmd(cmd, cmdtable, False)[1]

            if len(tableentry) > 2:

                self.fn, self.opts, self.help = tableentry

            else:

                self.fn, self.opts = tableentry

            self.args = aliasargs(self.fn) + args

            if cmd not in commands.norepo.split(' '):

                self.norepo = False

            if self.help.startswith("hg " + cmd):

                # drop prefix in old-style help lines so hg shows the alias

                self.help = self.help[4 + len(cmd):]

            self.__doc__ = self.fn.__doc__

        except error.UnknownCommand:

            def fn(ui, *args):

                ui.warn(_("alias '%s' resolves to unknown command '%s'\n") \

                            % (self.name, cmd))

                try:

                    # check if the command is in a disabled extension

                    commands.help_(ui, cmd, unknowncmd=True)

                except error.UnknownCommand:

                    pass

                return 1

            self.fn = fn

            self.badalias = True

        except error.AmbiguousCommand:

            def fn(ui, *args):

                ui.warn(_("alias '%s' resolves to ambiguous command '%s'\n") \

                            % (self.name, cmd))

                return 1

            self.fn = fn

            self.badalias = True

    def __call__(self, ui, *args, **opts):

        if self.shadows:

            ui.debug("alias '%s' shadows command '%s'\n" %

                     (self.name, self.cmdname))

        if self.definition.startswith('!'):

            return self.fn(ui, *args, **opts)

        else:

            try:

                util.checksignature(self.fn)(ui, *args, **opts)

            except error.SignatureError:

                args = ' '.join([self.cmdname] + self.args)

                ui.debug("alias '%s' expands to '%s'\n" % (self.name, args))

                raise

def addaliases(ui, cmdtable):

    # aliases are processed after extensions have been loaded, so they

    # may use extension commands. Aliases can also use other alias definitions,

    # but only if they have been defined prior to the current definition.

    for alias, definition in ui.configitems('alias'):

        aliasdef = cmdalias(alias, definition, cmdtable)

        cmdtable[aliasdef.cmd] = (aliasdef, aliasdef.opts, aliasdef.help)

        if aliasdef.norepo:

            commands.norepo += ' %s' % alias

def _parse(ui, args):

    options = {}

    cmdoptions = {}

    try:

        args = fancyopts.fancyopts(args, commands.globalopts, options)

    except fancyopts.getopt.GetoptError, inst:

        raise error.CommandError(None, inst)

    if args:

        cmd, args = args[0], args[1:]

        aliases, entry = cmdutil.findcmd(cmd, commands.table,

                                     ui.config("ui", "strict"))

        cmd = aliases[0]

        args = aliasargs(entry[0]) + args

        defaults = ui.config("defaults", cmd)

        if defaults:

            args = map(util.expandpath, shlex.split(defaults)) + args

        c = list(entry[1])

    else:

        cmd = None

        c = []

    # combine global options into local

    for o in commands.globalopts:

        c.append((o[0], o[1], options[o[1]], o[3]))

    try:

        args = fancyopts.fancyopts(args, c, cmdoptions, True)

    except fancyopts.getopt.GetoptError, inst:

        raise error.CommandError(cmd, inst)