# fetch.py - pull and merge remote changes

#

# Copyright 2006 Vadim Gelfer <vadim.gelfer@gmail.com>

#

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

# of the GNU General Public License, incorporated herein by reference.

'''pulling, updating and merging in one command'''

from mercurial.i18n import _

from mercurial.node import nullid, short

from mercurial import commands, cmdutil, hg, util

def fetch(ui, repo, source='default', **opts):

    '''Pull changes from a remote repository, merge new changes if needed.

    This finds all changes from the repository at the specified path

    or URL and adds them to the local repository.

    merged, and the result of the merge is committed.  Otherwise, the

    working directory is updated to include the new changes.

    When a merge occurs, the newly pulled changes are assumed to be

    "authoritative".  The head of the new changes is used as the first

    parent, with local changes as the second.  To switch the merge

    order, use --switch-parent.

    See 'hg help dates' for a list of formats valid for -d/--date.

    '''

    date = opts.get('date')

    if date:

        opts['date'] = util.parsedate(date)

    parent, p2 = repo.dirstate.parents()

    if p2 != nullid:

        raise util.Abort(_('outstanding uncommitted merge'))

    wlock = lock = None

    try:

        wlock = repo.wlock()

        lock = repo.lock()

        mod, add, rem, del_ = repo.status()[:4]

        if mod or add or rem:

            raise util.Abort(_('outstanding uncommitted changes'))

        if del_:

            raise util.Abort(_('working directory is missing some files'))

        cmdutil.setremoteconfig(ui, opts)

        other = hg.repository(ui, ui.expandpath(source))

        ui.status(_('pulling from %s\n') %

                  util.hidepassword(ui.expandpath(source)))

        revs = None

        if opts['rev']:

            if not other.local():

                raise util.Abort(_("fetch -r doesn't work for remote "

                                   "repositories yet"))

            else:

                revs = [other.lookup(rev) for rev in opts['rev']]

        modheads = repo.pull(other, heads=revs)

        if modheads == 0:

            return 0

        newparent = parent

        if newchildren:

            newparent = newchildren[0]

            hg.clean(repo, newparent)

        if len(newheads) > 1:

                      (len(newheads) - 1))

            return

        err = False

        if newheads:

            # By default, we consider the repository we're pulling

            # *from* as authoritative, so we merge our changes into

            # theirs.

            if opts['switch_parent']:

                firstparent, secondparent = newparent, newheads[0]

            else:

                firstparent, secondparent = newheads[0], newparent

                ui.status(_('updating to %d:%s\n') %

                          (repo.changelog.rev(firstparent),

                           short(firstparent)))

            hg.clean(repo, firstparent)

            ui.status(_('merging with %d:%s\n') %

                      (repo.changelog.rev(secondparent), short(secondparent)))

            err = hg.merge(repo, secondparent, remind=False)

        if not err:

            mod, add, rem = repo.status()[:3]

            message = (cmdutil.logmessage(opts) or

                       (_('Automated merge with %s') %

                        util.removeauth(other.url())))

            force_editor = opts.get('force_editor') or opts.get('edit')

            n = repo.commit(mod + add + rem, message,

                            opts['user'], opts['date'], force=True,

                            force_editor=force_editor)

            ui.status(_('new changeset %d:%s merges remote changes '

                        'with local\n') % (repo.changelog.rev(n),

                                           short(n)))

    finally:

        del lock, wlock

cmdtable = {

    'fetch':

        (fetch,

        [('r', 'rev', [], _('a specific revision you would like to pull')),

         ('e', 'edit', None, _('edit commit message')),

         ('', 'force-editor', None, _('edit commit message (DEPRECATED)')),

         ('', 'switch-parent', None, _('switch parents when merging')),

        ] + commands.commitopts + commands.commitopts2 + commands.remoteopts,

        _('hg fetch [SOURCE]')),

}