# ui.py - user interface bits for mercurial
#
# Copyright 2005, 2006 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 gettext as _
from demandload import *
demandload(globals(), "errno getpass os re socket sys tempfile")
demandload(globals(), "ConfigParser mdiff templater traceback util")

def dupconfig(orig):
    new = ConfigParser.SafeConfigParser(orig.defaults())
    updateconfig(orig, new)
    return new

def updateconfig(source, dest):
    for section in source.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, verbose=False, debug=False, quiet=False,
                 interactive=True, traceback=False, parentui=None):
        self.overlay = None
        self.header = []
        self.prev_header = []
        if parentui is None:
            # this is the parent of all ui children
            self.parentui = None
            self.readhooks = []
            self.cdata = ConfigParser.SafeConfigParser()
            self.readconfig(util.rcpath())

            self.quiet = self.configbool("ui", "quiet")
            self.verbose = self.configbool("ui", "verbose")
            self.debugflag = self.configbool("ui", "debug")
            self.interactive = self.configbool("ui", "interactive", True)
            self.traceback = traceback

            self.updateopts(verbose, debug, quiet, interactive)
        else:
            # parentui may point to an ui object which is already a child
            self.parentui = parentui.parentui or parentui
            self.readhooks = self.parentui.readhooks[:]
            self.cdata = dupconfig(self.parentui.cdata)
            if self.parentui.overlay:
                self.overlay = dupconfig(self.parentui.overlay)

    def __getattr__(self, key):
        return getattr(self.parentui, key)

    def updateopts(self, verbose=False, debug=False, quiet=False,
                   interactive=True, traceback=False, config=[]):
        self.quiet = self.quiet or quiet
        self.verbose = self.verbose or verbose
        self.debugflag = self.debugflag or debug

        self.verbosity_constraints(quiet, verbose, debug)

        self.interactive = (self.interactive and interactive)
        self.traceback = self.traceback or traceback
        for section, name, value in config:
            self.setconfig(section, name, value)

    def verbosity_constraints(self, quiet, verbose, debug):
        if self.debugflag:
            self.verbose = True
            self.quiet = False
        elif self.verbose and self.quiet:
            if quiet and not verbose:
                self.verbose = False
            elif not quiet and verbose:
                self.quiet = False
            else:
                self.quiet = self.verbose = False

    def readconfig(self, fn, root=None):
        if isinstance(fn, basestring):
            fn = [fn]
        for f in fn:
            try:
                self.cdata.read(f)
            except ConfigParser.ParsingError, inst:
                raise util.Abort(_("Failed to parse %s\n%s") % (f, inst))
        # override data from config files with data set with ui.setconfig
        if self.overlay:
            updateconfig(self.overlay, self.cdata)
        if root is None:
            root = os.path.expanduser('~')
        self.fixconfig(root=root)
        for hook in self.readhooks:
            hook(self)

    def addreadhook(self, hook):
        self.readhooks.append(hook)

    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.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.join(root, path))

    def setconfig(self, section, name, value):
        if not self.overlay:
            self.overlay = ConfigParser.SafeConfigParser()
        for cdata in (self.overlay, self.cdata):
            if not cdata.has_section(section):
                cdata.add_section(section)
            cdata.set(section, name, value)
        self.fixconfig(section, name, value)

    def _config(self, section, name, default, funcname):
        if self.cdata.has_option(section, name):
            try:
                func = getattr(self.cdata, funcname)
                return func(section, name)
            except ConfigParser.InterpolationError, inst:
                raise util.Abort(_("Error in configuration section [%s] "
                                   "parameter '%s':\n%s")
                                 % (section, name, inst))
        return default

    def config(self, section, name, default=None):
        return self._config(section, name, default, 'get')

    def configbool(self, section, name, default=False):
        return self._config(section, name, default, 'getboolean')

    def configlist(self, section, name, default=None):
        """Return a list of comma/space separated strings"""
        result = self.config(section, name)
        if result is None:
            result = default or []
        if isinstance(result, basestring):
            result = result.replace(",", " ").split()
        return result

    def has_config(self, section):
        '''tell whether section exists in config.'''
        return self.cdata.has_section(section)

    def configitems(self, section):
        items = {}
        if self.cdata.has_section(section):
            try:
                items.update(dict(self.cdata.items(section)))
            except ConfigParser.InterpolationError, inst:
                raise util.Abort(_("Error in configuration section [%s]:\n%s")
                                 % (section, inst))
        x = items.items()
        x.sort()
        return x

    def walkconfig(self):
        sections = self.cdata.sections()
        sections.sort()
        for section in sections:
            for name, value in self.configitems(section):
                yield section, name, value.replace('\n', '\\n')

    def extensions(self):
        result = self.configitems("extensions")
        for i, (key, value) in enumerate(result):
            if value:
                result[i] = (key, os.path.expanduser(value))
        return result

    def hgignorefiles(self):
        result = []
        for key, value in self.configitems("ui"):
            if key == 'ignore' or key.startswith('ignore.'):
                result.append(os.path.expanduser(value))
        return result

    def configrevlog(self):
        result = {}
        for key, value in self.configitems("revlog"):
            result[key.lower()] = value
        return result

    def username(self):
        """Return default username to be used in commits.

        Searched in this order: $HGUSER, [ui] section of hgrcs, $EMAIL
        and stop searching if one of these is set.
        Abort if found username is an empty string to force specifying
        the commit user elsewhere, e.g. with line option or repo hgrc.
        If not found, use ($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:
            try:
                user = '%s@%s' % (util.getuser(), socket.getfqdn())
            except KeyError:
                raise util.Abort(_("Please specify a username."))
        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(loc):
            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 write(self, *args):
        if self.header:
            if self.header != self.prev_header:
                self.prev_header = self.header
                self.write(*self.header)
            self.header = []
        for a in args:
            sys.stdout.write(str(a))

    def write_header(self, *args):
        for a in args:
            self.header.append(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))
        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):
        return sys.stdin.readline()[:-1]
    def prompt(self, msg, pat=None, default="y"):
        if not self.interactive: return default
        while 1:
            self.write(msg, " ")
            r = self.readline()
            if not pat or re.match(pat, r):
                return r
            else:
                self.write(_("unrecognized response\n"))
    def getpass(self, prompt=None, default=None):
        if not self.interactive: return default
        return getpass.getpass(prompt or _('password: '))
    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 = (os.environ.get("HGEDITOR") or
                    self.config("ui", "editor") or
                    os.environ.get("EDITOR", "vi"))

            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.'''
        if self.traceback:
            traceback.print_exc()
        return self.traceback