view mercurial/ui.py @ 8940:01ada7b1861d

ui.prompt: Show prompt and selection in non-interactive mode

ui.prompt was completely silent in non-interactive mode, unless in verbose
mode. It is fine that it chooses the default automatically, but it is confusing
that the message and prompt shown interactively can't be found in scripted
tests.

The prompt and selection is now .write'ed instead of .note'ed.

# ui.py - user interface bits for mercurial
#
# Copyright 2005-2007 Matt Mackall <[e-mail]>
#
# 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 errno, getpass, os, socket, sys, tempfile, traceback
import config, 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._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.fixconfig()
        else:
            # 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 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):
        # 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 p and "://" not in p and not os.path.isabs(p):
                    c.set("paths", n, os.path.normpath(os.path.join(root, p)))

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

        # update trust information
        self._trustusers.update(self.configlist('trusted', 'users'))
        self._trustgroups.update(self.configlist('trusted', 'groups'))

    def setconfig(self, section, name, value):
        for cfg in (self._ocfg, self._tcfg, self._ucfg):
            cfg.set(section, name, value)
        self.fixconfig()

    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 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._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 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 _path(self, loc):
        p = self.config('paths', loc)
        if p and '%%' in p:
            self.warn('(deprecated \'%%\' in path %s=%s from %s)\n' %
                    (loc, p, self.configsource('paths', loc)))
            p = p.replace('%%', '%')
        return p

    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._path(loc)
        if not path and default is not None:
            path = self._path(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 interactive(self):
        i = self.configbool("ui", "interactive", None)
        if i is None:
            return sys.stdin.isatty()
        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, choices=None, default="y"):
        """Prompt user with msg, read response, and ensure it matches
        one of the provided choices. choices is a sequence of acceptable
        responses with the format: ('&None', 'E&xec', 'Sym&link')
        No sequence implies no response checking. Responses are case
        insensitive. If ui is not interactive, the default is returned.
        """
        if not self.interactive():
            self.write(msg, ' ', default, "\n")
            return default
        while True:
            try:
                r = self._readline(msg + ' ')
                if not r:
                    return default
                if not choices:
                    return r
                resps = [s[s.index('&')+1].lower() for s in choices]
                if r.lower() in resps:
                    return r.lower()
                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()
        finally:
            os.unlink(name)

        return t

    def traceback(self):
        '''print exception traceback if traceback printing enabled.
        only to call in exception handler. returns true if traceback
        printed.'''
        if self._traceback:
            traceback.print_exc()
        return self._traceback

    def geteditor(self):
        '''return editor to use'''
        return (os.environ.get("HGEDITOR") or
                self.config("ui", "editor") or
                os.environ.get("VISUAL") or
                os.environ.get("EDITOR", "vi"))