# 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, incorporated herein by reference.

from i18n import _

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

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

import cmdutil, encoding

import ui as _ui

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 = _ui.ui()

        if '--traceback' in args:

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

    except util.Abort, inst:

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

        return -1

    return _runcatch(u, args)

def _runcatch(ui, args):

    def catchterm(*args):

        raise error.SignalInterrupt

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

        num = getattr(signal, name, None)

        if num: signal.signal(num, catchterm)

    try:

        try:

            # enter the debugger before command execution

            if '--debugger' in args:

                pdb.set_trace()

            try:

                return _dispatch(ui, args)

            finally:

                ui.flush()

        except:

            # enter the debugger when we hit an exception

            if '--debugger' in args:

                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.ConfigError, inst:

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

    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.ParseError, 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])

        commands.help_(ui, 'shortlist')

    except util.Abort, inst:

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

    except ImportError, inst:

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

        ui.warn(_("abort: could not import module %s!\n") % m)

        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(_("** 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 _findrepo(p):

    while not os.path.isdir(os.path.join(p, ".hg")):

        oldp, p = p, os.path.dirname(p)

        if p == oldp:

            return None

    return p

def aliasargs(fn):

    if hasattr(fn, 'args'):

        return fn.args

    return []

class cmdalias(object):

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

        self.name = name

        self.definition = definition

        self.args = []

        self.opts = []

        self.help = ''

        self.norepo = True

        try:

            cmdutil.findcmd(self.name, cmdtable, True)

            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

            return

        args = shlex.split(self.definition)

        cmd = args.pop(0)

        opts = []

        help = ''

        try:

            self.fn, self.opts, self.help = cmdutil.findcmd(cmd, cmdtable, False)[1]

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

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

                self.norepo = False

        except error.UnknownCommand:

            def fn(ui, *args):

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

                            % (self.name, cmd))

                return 1

            self.fn = fn

        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

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

        if self.shadows:

            ui.debug(_("alias '%s' shadows command\n") % self.name)

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

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[alias] = (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.ParseError(None, inst)

    if args:

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

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

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

        cmd = aliases[0]

        args = aliasargs(i[0]) + args

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

        if defaults:

            args = shlex.split(defaults) + args

        c = list(i[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.ParseError(cmd, inst)

    # separate global options back out

    for o in commands.globalopts:

        n = o[1]

        options[n] = cmdoptions[n]

        del cmdoptions[n]

    return (cmd, cmd and i[0] or None, args, options, cmdoptions)

def _parseconfig(ui, config):

    """parse the --config options from the command line"""

    for cfg in config:

        try:

            name, value = cfg.split('=', 1)

            section, name = name.split('.', 1)

            if not section or not name:

                raise IndexError

            ui.setconfig(section, name, value)

        except (IndexError, ValueError):

            raise util.Abort(_('malformed --config option: %s') % cfg)

def _earlygetopt(aliases, args):

    """Return list of values for an option (or aliases).

    The values are listed in the order they appear in args.

    The options and values are removed from args.

    """

    try:

        argcount = args.index("--")

    except ValueError:

        argcount = len(args)

    shortopts = [opt for opt in aliases if len(opt) == 2]

    values = []

    pos = 0

    while pos < argcount:

        if args[pos] in aliases:

            if pos + 1 >= argcount:

                # ignore and let getopt report an error if there is no value

                break

            del args[pos]

            values.append(args.pop(pos))

            argcount -= 2

        elif args[pos][:2] in shortopts:

            # short option can have no following space, e.g. hg log -Rfoo

            values.append(args.pop(pos)[2:])

            argcount -= 1

        else:

            pos += 1

    return values

def runcommand(lui, repo, cmd, fullargs, ui, options, d):

    # run pre-hook, and abort if it fails

    ret = hook.hook(lui, repo, "pre-%s" % cmd, False, args=" ".join(fullargs))

    if ret:

        return ret

    ret = _runcommand(ui, options, cmd, d)

    # run post-hook, passing command result

    hook.hook(lui, repo, "post-%s" % cmd, False, args=" ".join(fullargs),

              result = ret)

    return ret

_loaded = set()

def _dispatch(ui, args):

    # read --config before doing anything else

    # (e.g. to change trust settings for reading .hg/hgrc)

    _parseconfig(ui, _earlygetopt(['--config'], args))

    # check for cwd

    cwd = _earlygetopt(['--cwd'], args)

    if cwd:

        os.chdir(cwd[-1])

    # read the local repository .hgrc into a local ui object

    path = _findrepo(os.getcwd()) or ""

    if not path:

        lui = ui

    if path:

        try:

            lui = ui.copy()

            lui.readconfig(os.path.join(path, ".hg", "hgrc"))

        except IOError:

            pass

    # now we can expand paths, even ones in .hg/hgrc

    rpath = _earlygetopt(["-R", "--repository", "--repo"], args)

    if rpath:

        path = lui.expandpath(rpath[-1])

        lui = ui.copy()

        lui.readconfig(os.path.join(path, ".hg", "hgrc"))

    extensions.loadall(lui)