# ui.py - user interface bits 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, incorporated herein by reference.

from i18n import _

import errno, getpass, os, re, socket, sys, tempfile

import ConfigParser, traceback, util

def dupconfig(orig):

    new = util.configparser(orig.defaults())

    updateconfig(orig, new)

    return new

def updateconfig(source, dest, sections=None):

    if not sections:

        sections = source.sections()

    for section in sections:

        if not dest.has_section(section):

            dest.add_section(section)

        for name, value in source.items(section, raw=True):

            dest.set(section, name, value)

class ui(object):

    def __init__(self, parentui=None):

        self.buffers = []

        self.quiet = self.verbose = self.debugflag = self.traceback = False

        self.interactive = self.report_untrusted = True

        if parentui is None:

            # this is the parent of all ui children

            self.parentui = None

            self.trusted_users = {}

            self.trusted_groups = {}

            self.overlay = util.configparser()

            # if ucdata is not None, its keys must be a superset of cdata's

            self.cdata = util.configparser()

            self.ucdata = None

            # we always trust global config files

            self.readconfig(util.rcpath(), assumetrusted=True)

        else:

            # parentui may point to an ui object which is already a child

            self.parentui = parentui.parentui or parentui

            self.trusted_users = parentui.trusted_users.copy()

            self.trusted_groups = parentui.trusted_groups.copy()

            self.cdata = dupconfig(self.parentui.cdata)

            self.overlay = dupconfig(self.parentui.overlay)

            if self.parentui.ucdata:

                self.ucdata = dupconfig(self.parentui.ucdata)

            if self.parentui is not parentui:

                self.overlay = util.configparser()

                updateconfig(parentui.overlay, self.overlay)

            self.buffers = parentui.buffers

    def __getattr__(self, key):

        return getattr(self.parentui, key)

    _isatty = None

    def isatty(self):

        if ui._isatty is None:

            try:

                ui._isatty = sys.stdin.isatty()

            except AttributeError: # not a real file object

                ui._isatty = False

        return ui._isatty

    def _is_trusted(self, fp, f, warn=True):

        st = util.fstat(fp)

        if util.isowner(fp, st):

            return True

        tusers = self.trusted_users

        tgroups = self.trusted_groups

        if not tusers:

            user = util.username()

            if user is not None:

                self.trusted_users[user] = 1

                self.fixconfig(section='trusted')

        if (tusers or tgroups) and '*' not in tusers and '*' not in tgroups:

            user = util.username(st.st_uid)

            group = util.groupname(st.st_gid)

            if user not in tusers and group not in tgroups:

                if warn and self.report_untrusted:

                    self.warn(_('Not trusting file %s from untrusted '

                                'user %s, group %s\n') % (f, user, group))

                return False

        return True

    def readconfig(self, fn, root=None, assumetrusted=False):

        if isinstance(fn, basestring):

            fn = [fn]

        for f in fn:

            try:

                fp = open(f)

            except IOError:

                continue

            cdata = self.cdata

            trusted = assumetrusted or self._is_trusted(fp, f)

            if not trusted:

                if self.ucdata is None:

                    self.ucdata = dupconfig(self.cdata)

                cdata = self.ucdata

            elif self.ucdata is not None:

                # use a separate configparser, so that we don't accidentally

                # override ucdata settings later on.

                cdata = util.configparser()

            try:

                cdata.readfp(fp, f)

            except ConfigParser.ParsingError, inst:

                msg = _("Failed to parse %s\n%s") % (f, inst)

                if trusted:

                    raise util.Abort(msg)

                self.warn(_("Ignored: %s\n") % msg)

            if trusted:

                if cdata != self.cdata:

                    updateconfig(cdata, self.cdata)

                if self.ucdata is not None:

                    updateconfig(cdata, self.ucdata)

        # override data from config files with data set with ui.setconfig

        updateconfig(self.overlay, self.cdata)

        if root is None:

            root = os.path.expanduser('~')

        self.fixconfig(root=root)

    def readsections(self, filename, *sections):

        """Read filename and add only the specified sections to the config data

        The settings are added to the trusted config data.

        """

        if not sections:

            return

        cdata = util.configparser()

        try:

            try:

                fp = open(filename)

            except IOError, inst:

                raise util.Abort(_("unable to open %s: %s") %

                                 (filename, getattr(inst, "strerror", inst)))

            try:

                cdata.readfp(fp, filename)

            finally:

                fp.close()

        except ConfigParser.ParsingError, inst:

            raise util.Abort(_("failed to parse %s\n%s") % (filename, inst))

        for section in sections:

            if not cdata.has_section(section):

                cdata.add_section(section)

        updateconfig(cdata, self.cdata, sections)

        if self.ucdata:

            updateconfig(cdata, self.ucdata, sections)

    def fixconfig(self, section=None, name=None, value=None, root=None):

        # translate paths relative to root (or home) into absolute paths

        if section is None or section == 'paths':

            if root is None:

                root = os.getcwd()

            items = section and [(name, value)] or []

            for cdata in self.cdata, self.ucdata, self.overlay:

                if not cdata: continue

                if not items and cdata.has_section('paths'):

                    pathsitems = cdata.items('paths')

                else:

                    pathsitems = items

                for n, path in pathsitems:

                    if path and "://" not in path and not os.path.isabs(path):

                        cdata.set("paths", n,

                                  os.path.normpath(os.path.join(root, path)))

        if section is None or section == 'ui':

            self.traceback = self.configbool('ui', 'traceback', False)

        # update trust information

        if (section is None or section == 'trusted') and self.trusted_users:

            for user in self.configlist('trusted', 'users'):

                self.trusted_users[user] = 1

            for group in self.configlist('trusted', 'groups'):

                self.trusted_groups[group] = 1

    def setconfig(self, section, name, value):

        for cdata in (self.overlay, self.cdata, self.ucdata):

            if not cdata: continue

            if not cdata.has_section(section):

                cdata.add_section(section)

            cdata.set(section, name, value)

        self.fixconfig(section, name, value)

    def _get_cdata(self, untrusted):

        if untrusted and self.ucdata:

            return self.ucdata

        return self.cdata

    def _config(self, section, name, default, funcname, untrusted, abort):

        cdata = self._get_cdata(untrusted)

        if cdata.has_option(section, name):

            try:

                func = getattr(cdata, funcname)

                return func(section, name)

            except (ConfigParser.InterpolationError, ValueError), inst:

                msg = _("Error in configuration section [%s] "

                        "parameter '%s':\n%s") % (section, name, inst)

                if abort:

                    raise util.Abort(msg)

                self.warn(_("Ignored: %s\n") % msg)

        return default

    def _configcommon(self, section, name, default, funcname, untrusted):

        value = self._config(section, name, default, funcname,

                             untrusted, abort=True)

        if self.debugflag and not untrusted and self.ucdata:

            uvalue = self._config(section, name, None, funcname,

                                  untrusted=True, abort=False)

            if uvalue is not None and uvalue != value:

                self.warn(_("Ignoring untrusted configuration option "

                            "%s.%s = %s\n") % (section, name, uvalue))

        return value

    def config(self, section, name, default=None, untrusted=False):

        return self._configcommon(section, name, default, 'get', untrusted)

    def configbool(self, section, name, default=False, untrusted=False):

        return self._configcommon(section, name, default, 'getboolean',

                                  untrusted)

    def configlist(self, section, name, default=None, untrusted=False):

        """Return a list of comma/space separated strings"""

        result = self.config(section, name, untrusted=untrusted)

        if result is None:

            result = default or []

        if isinstance(result, basestring):

            result = result.replace(",", " ").split()

        return result

    def has_section(self, section, untrusted=False):

        '''tell whether section exists in config.'''

        cdata = self._get_cdata(untrusted)

        return cdata.has_section(section)

    def _configitems(self, section, untrusted, abort):

        items = {}

        cdata = self._get_cdata(untrusted)

        if cdata.has_section(section):

            try:

                items.update(dict(cdata.items(section)))

            except ConfigParser.InterpolationError, inst:

                msg = _("Error in configuration section [%s]:\n"

                        "%s") % (section, inst)

                if abort:

                    raise util.Abort(msg)

                self.warn(_("Ignored: %s\n") % msg)

        return items

    def configitems(self, section, untrusted=False):

        items = self._configitems(section, untrusted=untrusted, abort=True)

        if self.debugflag and not untrusted and self.ucdata:

            uitems = self._configitems(section, untrusted=True, abort=False)

            for k in util.sort(uitems):

                if uitems[k] != items.get(k):

                    self.warn(_("Ignoring untrusted configuration option "

                                "%s.%s = %s\n") % (section, k, uitems[k]))

        return util.sort(items.items())

    def walkconfig(self, untrusted=False):

        cdata = self._get_cdata(untrusted)

        sections = cdata.sections()

        sections.sort()

        for section in sections:

            for name, value in self.configitems(section, untrusted):

                yield section, name, str(value).replace('\n', '\\n')

    def username(self):

        """Return default username to be used in commits.

        Searched in this order: $HGUSER, [ui] section of hgrcs, $EMAIL

        and stop searching if one of these is set.

        If not found and ui.askusername is True, ask the user, else use

        ($LOGNAME or $USER or $LNAME or $USERNAME) + "@full.hostname".

        """

        user = os.environ.get("HGUSER")

        if user is None:

            user = self.config("ui", "username")

        if user is None:

            user = os.environ.get("EMAIL")

        if user is None and self.configbool("ui", "askusername"):

            user = self.prompt(_("enter a commit username:"), default=None)

        if user is None:

            try:

                user = '%s@%s' % (util.getuser(), socket.getfqdn())

                self.warn(_("No username found, using '%s' instead\n") % user)

            except KeyError:

                pass

        if not user:

            raise util.Abort(_("Please specify a username."))

        if "\n" in user:

            raise util.Abort(_("username %s contains a newline\n") % repr(user))

        return user

    def shortuser(self, user):

        """Return a short representation of a user name or email address."""

        if not self.verbose: user = util.shortuser(user)

        return user

    def expandpath(self, loc, default=None):

        """Return repository location relative to cwd or from [paths]"""

        if "://" in loc or os.path.isdir(os.path.join(loc, '.hg')):

            return loc

        path = self.config("paths", loc)

        if not path and default is not None:

            path = self.config("paths", default)

        return path or loc

    def pushbuffer(self):

        self.buffers.append([])

    def popbuffer(self):

        return "".join(self.buffers.pop())

    def write(self, *args):

        if self.buffers:

            self.buffers[-1].extend([str(a) for a in args])

        else:

            for a in args:

                sys.stdout.write(str(a))

    def write_err(self, *args):