# __init__.py - inotify-based status acceleration for Linux

#

# Copyright 2006, 2007, 2008 Bryan O'Sullivan <bos@serpentine.com>

# Copyright 2007, 2008 Brendan Cully <brendan@kublai.com>

#

# This software may be used and distributed according to the terms of the

# GNU General Public License version 2 or any later version.

'''accelerate status report using Linux's inotify service'''

# todo: socket permissions

from mercurial.i18n import _

from mercurial import util

import server

from client import client, QueryFailed

def serve(ui, repo, **opts):

    '''start an inotify server for this repository'''

    server.start(ui, repo.dirstate, repo.root, opts)

def debuginotify(ui, repo, **opts):

    '''debugging information for inotify extension

    Prints the list of directories being watched by the inotify server.

    '''

    cli = client(ui, repo)

    response = cli.debugquery()

    ui.write(_('directories being watched:\n'))

    for path in response:

        ui.write(('  %s/\n') % path)

def reposetup(ui, repo):

    if not util.safehasattr(repo, 'dirstate'):

        return

    class inotifydirstate(repo.dirstate.__class__):

        # We'll set this to false after an unsuccessful attempt so that

        # next calls of status() within the same instance don't try again

        # to start an inotify server if it won't start.

        _inotifyon = True

        def status(self, match, subrepos, ignored, clean, unknown):

            files = match.files()

            if '.' in files:

                files = []

            if (self._inotifyon and not ignored and not subrepos and

                not self._dirty):

                cli = client(ui, repo)

                try:

                    result = cli.statusquery(files, match, False,

                                            clean, unknown)

                except QueryFailed, instr:

                    ui.debug(str(instr))

                    # don't retry within the same hg instance

                    inotifydirstate._inotifyon = False

                    pass

                else:

                    if ui.config('inotify', 'debug'):

                        r2 = super(inotifydirstate, self).status(

                            match, [], False, clean, unknown)

                        for c, a, b in zip('LMARDUIC', result, r2):

                            for f in a:

                                if f not in b:

                                    ui.warn('*** inotify: %s +%s\n' % (c, f))

                            for f in b:

                                if f not in a:

                                    ui.warn('*** inotify: %s -%s\n' % (c, f))

                        result = r2

                    return result

            return super(inotifydirstate, self).status(

                match, subrepos, ignored, clean, unknown)

    repo.dirstate.__class__ = inotifydirstate

cmdtable = {

    'debuginotify':

        (debuginotify, [], ('hg debuginotify')),

    '^inserve':

        (serve,

         [('d', 'daemon', None, _('run server in background')),

          ('', 'daemon-pipefds', '',

           _('used internally by daemon mode'), _('NUM')),

          ('t', 'idle-timeout', '',

           _('minutes to sit idle before exiting'), _('NUM')),

          ('', 'pid-file', '',

           _('name of file to write process ID to'), _('FILE'))],

         _('hg inserve [OPTION]...')),

    }