# 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 config, traceback, util, error

_booleans = {'1':True, 'yes':True, 'true':True, 'on':True,

             '0':False, 'no':False, 'false':False, 'off':False}

class ui(object):

    def __init__(self, src=None):

        self.buffers = []

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

        self.interactive = self.report_untrusted = True

        self.overlay = config.config()

        self.cdata = config.config()

        self.ucdata = config.config()

        self.trusted_users = {}

        self.trusted_groups = {}

        if src:

            self.cdata = src.cdata.copy()

            self.ucdata = src.ucdata.copy()

            self.overlay = src.overlay.copy()

            self.trusted_users = src.trusted_users.copy()

            self.trusted_groups = src.trusted_groups.copy()

            self.fixconfig()

        else:

            # we always trust global config files

            for f in util.rcpath():

                self.readconfig(f, assumetrusted=True)

    def copy(self):

        return ui(self)

    _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

            except IOError:

                # access to stdin is unsafe in a WSGI environment

                ui._isatty = False

        return ui._isatty

    def _is_trusted(self, fp, f):

        st = util.fstat(fp)

        if util.isowner(fp, st):

            return True

        tusers = self.trusted_users

        tgroups = self.trusted_groups

        if '*' in tusers or '*' in tgroups:

            return True

        user = util.username(st.st_uid)

        group = util.groupname(st.st_gid)

        if user in tusers or group in tgroups or user == util.username():

            return True

        if self.report_untrusted:

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

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

        return False

    def readconfig(self, filename, root=None, assumetrusted=False,

                   sections = None):

        try:

            fp = open(filename)

        except IOError:

            if not sections: # ignore unless we were looking for something

                return

            raise

        cdata = config.config()

        trusted = sections or assumetrusted or self._is_trusted(fp, filename)

        try:

        except error.ConfigError, inst:

            if trusted:

                raise

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

        if trusted:

        if root is None:

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

        self.fixconfig(root=root)

    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 items and 'paths' in cdata:

                    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)))

        # update ui options

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

            self.debugflag = self.configbool('ui', 'debug')

            self.verbose = self.debugflag or self.configbool('ui', 'verbose')

            self.quiet = not self.debugflag and self.configbool('ui', 'quiet')

            if self.verbose and self.quiet:

                self.quiet = self.verbose = False

            self.report_untrusted = self.configbool("ui", "report_untrusted",

                                                    True)

            self.interactive = self.configbool("ui", "interactive",

                                               self.isatty())

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

        # update trust information

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

            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):

            cdata.set(section, name, value)

        self.fixconfig(section, name, value)

    def _get_cdata(self, untrusted):

        if untrusted:

            return self.ucdata

        return self.cdata

    def configsource(self, section, name, untrusted=False):

        return self._get_cdata(untrusted).getsource(section, name) or 'none'

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

        value = self._get_cdata(untrusted).get(section, name, default)

        if self.debugflag and not untrusted:

            uvalue = self.ucdata.get(section, name)

            if uvalue is not None and uvalue != value:

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

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

        return value

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

        v = self.config(section, name, None, untrusted)

        if v == None:

            return default

        if v.lower() not in _booleans:

            raise error.ConfigError(_("%s.%s not a boolean ('%s')")

                                    % (section, name, v))

        return _booleans[v.lower()]

    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.'''

        return section in self._get_cdata(untrusted)

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

        items = self._get_cdata(untrusted).items(section)

        if self.debugflag and not untrusted:

            for k,v in self.ucdata.items(section):

                if self.cdata.get(section, k) != v:

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

                                "%s.%s = %s\n") % (section, k, v))

        return items

    def walkconfig(self, untrusted=False):

        cdata = self._get_cdata(untrusted)

        for section in cdata.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):

        try:

            if not sys.stdout.closed: sys.stdout.flush()

            for a in args:

                sys.stderr.write(str(a))

            # stderr may be buffered under win32 when redirected to files,

            # including stdout.

            if not sys.stderr.closed: sys.stderr.flush()

        except IOError, inst:

            if inst.errno != errno.EPIPE:

                raise

    def flush(self):

        try: sys.stdout.flush()

        except: pass

        try: sys.stderr.flush()

        except: pass

    def _readline(self, prompt=''):

        if self.isatty():

            try:

                # magically add command line editing support, where

                # available

                import readline

                # force demandimport to really load the module

                readline.read_history_file

                # windows sometimes raises something other than ImportError

            except Exception:

                pass

        line = raw_input(prompt)

        # When stdin is in binary mode on Windows, it can cause

        # raw_input() to emit an extra trailing carriage return

        if os.linesep == '\r\n' and line and line[-1] == '\r':

            line = line[:-1]

        return line

    def prompt(self, msg, pat=None, default="y"):

        """Prompt user with msg, read response, and ensure it matches pat

        If not interactive -- the default is returned

        """

        if not self.interactive:

            self.note(msg, ' ', default, "\n")

            return default

        while True:

            try:

                r = self._readline(msg + ' ')

                if not r:

                    return default

                if not pat or re.match(pat, r):

                    return r

                else:

                    self.write(_("unrecognized response\n"))

            except EOFError:

                raise util.Abort(_('response expected'))

    def getpass(self, prompt=None, default=None):

        if not self.interactive: return default

        try:

            return getpass.getpass(prompt or _('password: '))

        except EOFError:

            raise util.Abort(_('response expected'))

    def status(self, *msg):

        if not self.quiet: self.write(*msg)

    def warn(self, *msg):

        self.write_err(*msg)

    def note(self, *msg):

        if self.verbose: self.write(*msg)

    def debug(self, *msg):

        if self.debugflag: self.write(*msg)

    def edit(self, text, user):

        (fd, name) = tempfile.mkstemp(prefix="hg-editor-", suffix=".txt",

                                      text=True)

        try:

            f = os.fdopen(fd, "w")

            f.write(text)

            f.close()

            editor = self.geteditor()

            util.system("%s \"%s\"" % (editor, name),

                        environ={'HGUSER': user},

                        onerr=util.Abort, errprefix=_("edit failed"))

            f = open(name)

            t = f.read()

            f.close()

            t = re.sub("(?m)^HG:.*\n", "", t)

        finally:

            os.unlink(name)

        return t

    def print_exc(self):

        '''print exception traceback if traceback printing enabled.

        only to call in exception handler. returns true if traceback

        printed.'''