# 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 version 2 or any later version.

from i18n import _

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

import config, util, error

class ui(object):

    def __init__(self, src=None):

        self._buffers = []

        self.quiet = self.verbose = self.debugflag = self.tracebackflag = False

        self._reportuntrusted = True

        self._ocfg = config.config() # overlay

        self._tcfg = config.config() # trusted

        self._ucfg = config.config() # untrusted

        self._trustusers = set()

        self._trustgroups = set()

        if src:

            self._tcfg = src._tcfg.copy()

            self._ucfg = src._ucfg.copy()

            self._ocfg = src._ocfg.copy()

            self._trustusers = src._trustusers.copy()

            self._trustgroups = src._trustgroups.copy()

            self.environ = src.environ

            self.fixconfig()

        else:

            # shared read-only environment

            self.environ = os.environ

            # we always trust global config files

            for f in util.rcpath():

                self.readconfig(f, trust=True)

    def copy(self):

        return self.__class__(self)

    def _is_trusted(self, fp, f):

        st = util.fstat(fp)

        if util.isowner(st):

            return True

        tusers, tgroups = self._trustusers, self._trustgroups

        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._reportuntrusted:

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

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

        return False

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

                   sections=None, remap=None):

        try:

            fp = open(filename)

        except IOError:

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

                return

            raise

        cfg = config.config()

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

        try:

            cfg.read(filename, fp, sections=sections, remap=remap)

        except error.ConfigError, inst:

            if trusted:

                raise

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

        if self.plain():

            for k in ('debug', 'fallbackencoding', 'quiet', 'slash',

                      'logtemplate', 'style',

                      'traceback', 'verbose'):

                if k in cfg['ui']:

                    del cfg['ui'][k]

            for k, v in cfg.items('alias'):

                del cfg['alias'][k]

            for k, v in cfg.items('defaults'):

                del cfg['defaults'][k]

        if trusted:

            self._tcfg.update(cfg)

            self._tcfg.update(self._ocfg)

        self._ucfg.update(cfg)

        self._ucfg.update(self._ocfg)

        if root is None:

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

        self.fixconfig(root=root)

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

        if section in (None, 'paths'):

            # expand vars and ~

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

            root = root or os.getcwd()

            for c in self._tcfg, self._ucfg, self._ocfg:

                for n, p in c.items('paths'):

                    if not p:

                        continue

                    if '%%' in p:

                        self.warn(_("(deprecated '%%' in path %s=%s from %s)\n")

                                  % (n, p, self.configsource('paths', n)))

                        p = p.replace('%%', '%')

                    p = util.expandpath(p)

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

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

                    c.set("paths", n, p)

        if section in (None, 'ui'):

            # update ui options

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

                                        True)

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

        if section in (None, 'trusted'):

            # update trust information

            self._trustusers.update(self.configlist('trusted', 'users'))

            self._trustgroups.update(self.configlist('trusted', 'groups'))

    def setconfig(self, section, name, value, overlay=True):

        if overlay:

            self._ocfg.set(section, name, value)

        self._tcfg.set(section, name, value)

        self._ucfg.set(section, name, value)

        self.fixconfig(section=section)

    def _data(self, untrusted):

        return untrusted and self._ucfg or self._tcfg

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

        return self._data(untrusted).source(section, name) or 'none'

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

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

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

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

            if uvalue is not None and uvalue != value:

                self.debug(_("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 is None:

            return default

        if isinstance(v, bool):

            return v

        b = util.parsebool(v)

        if b is None:

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

                                    % (section, name, v))

        return b

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

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

        def _parse_plain(parts, s, offset):

            whitespace = False

            while offset < len(s) and (s[offset].isspace() or s[offset] == ','):

                whitespace = True

                offset += 1

            if offset >= len(s):

                return None, parts, offset

            if whitespace:

                parts.append('')

            if s[offset] == '"' and not parts[-1]:

                return _parse_quote, parts, offset + 1

            elif s[offset] == '"' and parts[-1][-1] == '\\':

                parts[-1] = parts[-1][:-1] + s[offset]

                return _parse_plain, parts, offset + 1

            parts[-1] += s[offset]

            return _parse_plain, parts, offset + 1

        def _parse_quote(parts, s, offset):

            if offset < len(s) and s[offset] == '"': # ""

                parts.append('')

                offset += 1

                while offset < len(s) and (s[offset].isspace() or

                        s[offset] == ','):

                    offset += 1

                return _parse_plain, parts, offset

            while offset < len(s) and s[offset] != '"':

                if (s[offset] == '\\' and offset + 1 < len(s)

                        and s[offset + 1] == '"'):

                    offset += 1

                    parts[-1] += '"'

                else:

                    parts[-1] += s[offset]

                offset += 1

            if offset >= len(s):

                real_parts = _configlist(parts[-1])

                if not real_parts:

                    parts[-1] = '"'

                else:

                    real_parts[0] = '"' + real_parts[0]

                    parts = parts[:-1]

                    parts.extend(real_parts)

                return None, parts, offset

            offset += 1

            while offset < len(s) and s[offset] in [' ', ',']:

                offset += 1

            if offset < len(s):

                if offset + 1 == len(s) and s[offset] == '"':

                    parts[-1] += '"'

                    offset += 1

                else:

                    parts.append('')

            else:

                return None, parts, offset

            return _parse_plain, parts, offset

        def _configlist(s):

            s = s.rstrip(' ,')

            if not s:

                return []

            parser, parts, offset = _parse_plain, [''], 0

            while parser:

                parser, parts, offset = parser(parts, s, offset)

            return parts

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

        if result is None:

            result = default or []

        if isinstance(result, basestring):

            result = _configlist(result.lstrip(' ,\n'))

            if result is None:

                result = default or []

        return result

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

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

        return section in self._data(untrusted)

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

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

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

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

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

                    self.debug(_("ignoring untrusted configuration option "

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

        return items

    def walkconfig(self, untrusted=False):

        cfg = self._data(untrusted)

        for section in cfg.sections():

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

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

    def plain(self):

        '''is plain mode active?

        Plain mode means that all configuration variables which affect the

        behavior and output of Mercurial should be ignored. Additionally, the

        output should be stable, reproducible and suitable for use in scripts or

        applications.

        The only way to trigger plain mode is by setting the `HGPLAIN'

        environment variable.

        '''

        return 'HGPLAIN' in os.environ

    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 not None:

                user = os.path.expandvars(user)

        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 and not self.interactive():

            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(_('no username supplied (see "hg help config")'))

        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, labeled=False):

        '''pop the last buffer and return the buffered output

        If labeled is True, any labels associated with buffered

        output will be handled. By default, this has no effect

        on the output returned, but extensions and GUI tools may

        handle this argument and returned styled output. If output

        is being buffered so it can be captured and parsed or

        processed, labeled should not be set to True.

        '''

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

    def write(self, *args, **opts):

        '''write args to output

        By default, this method simply writes to the buffer or stdout,

        but extensions or GUI tools may override this method,

        write_err(), popbuffer(), and label() to style output from

        various parts of hg.

        An optional keyword argument, "label", can be passed in.

        This should be a string containing label names separated by

        space. Label names take the form of "topic.type". For example,

        ui.debug() issues a label of "ui.debug".

        When labeling output for a specific command, a label of

        "cmdname.type" is recommended. For example, status issues

        a label of "status.modified" for modified files.

        '''

        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, **opts):

        try:

            if not getattr(sys.stdout, 'closed', False):

                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 getattr(sys.stderr, 'closed', False):

                sys.stderr.flush()

        except IOError, inst:

            if inst.errno not in (errno.EPIPE, errno.EIO):

                raise

    def flush(self):

        try: sys.stdout.flush()

        except: pass

        try: sys.stderr.flush()

        except: pass

    def interactive(self):

        '''is interactive input allowed?

        An interactive session is a session where input can be reasonably read

        from `sys.stdin'. If this function returns false, any attempt to read

        from stdin should fail with an error, unless a sensible default has been

        specified.

        Interactiveness is triggered by the value of the `ui.interactive'

        configuration variable or - if it is unset - when `sys.stdin' points

        to a terminal device.

        This function refers to input only; for output, see `ui.formatted()'.

        '''

        i = self.configbool("ui", "interactive", None)

        if i is None:

            try:

                return sys.stdin.isatty()

            except AttributeError:

                # some environments replace stdin without implementing isatty

                # usually those are non-interactive

                return False

        return i

    def termwidth(self):

        '''how wide is the terminal in columns?

        '''

        if 'COLUMNS' in os.environ:

            try:

                return int(os.environ['COLUMNS'])

            except ValueError:

                pass

        return util.termwidth()

    def formatted(self):

        '''should formatted output be used?

        It is often desirable to format the output to suite the output medium.

        Examples of this are truncating long lines or colorizing messages.

        However, this is not often not desirable when piping output into other

        utilities, e.g. `grep'.

        Formatted output is triggered by the value of the `ui.formatted'

        configuration variable or - if it is unset - when `sys.stdout' points

        to a terminal device. Please note that `ui.formatted' should be

        considered an implementation detail; it is not intended for use outside

        Mercurial or its extensions.

        This function refers to output only; for input, see `ui.interactive()'.

        This function always returns false when in plain mode, see `ui.plain()'.

        '''

        if self.plain():

            return False

        i = self.configbool("ui", "formatted", None)

        if i is None:

            try:

                return sys.stdout.isatty()

            except AttributeError:

                # some environments replace stdout without implementing isatty

                # usually those are non-interactive

                return False

        return i

    def _readline(self, prompt=''):

        if sys.stdin.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, default="y"):

        """Prompt user with msg, read response.

        If ui is not interactive, the default is returned.

        """

        if not self.interactive():

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

            return default

        try:

            r = self._readline(msg + ' ')

            if not r:

                return default

            return r

        except EOFError:

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

    def promptchoice(self, msg, choices, default=0):

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

        one of the provided choices. The index of the choice is returned.

        choices is a sequence of acceptable responses with the format:

        ('&None', 'E&xec', 'Sym&link') Responses are case insensitive.

        If ui is not interactive, the default is returned.

        """

        resps = [s[s.index('&')+1].lower() for s in choices]

        while True:

            r = self.prompt(msg, resps[default])

            if r.lower() in resps:

                return resps.index(r.lower())

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

    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, **opts):

        '''write status message to output (if ui.quiet is False)

        This adds an output label of "ui.status".

        '''

        if not self.quiet:

            opts['label'] = opts.get('label', '') + ' ui.status'

            self.write(*msg, **opts)

    def warn(self, *msg, **opts):

        '''write warning message to output (stderr)

        This adds an output label of "ui.warning".

        '''

        opts['label'] = opts.get('label', '') + ' ui.warning'

        self.write_err(*msg, **opts)

    def note(self, *msg, **opts):

        '''write note to output (if ui.verbose is True)

        This adds an output label of "ui.note".

        '''

        if self.verbose:

            opts['label'] = opts.get('label', '') + ' ui.note'

            self.write(*msg, **opts)

    def debug(self, *msg, **opts):

        '''write debug message to output (if ui.debugflag is True)