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#!/usr/bin/perl -w
#
# Description: safely pull all branches of a Git repository
#
# Copyright © 2009 Stéphane Glondu <steph@glondu.net>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301 USA.
#

sub update_remotes () {
    for (`git remote`) {
        chomp;
        print "Fetching $_...\n";
        system("git fetch $_") == 0
            or die "Could not fetch remote $_";
    }
}

sub get_remote ($) {
    my $branch = shift;
    my $remote = `git config --get "branch.${branch}.remote"`;
    chomp $remote;
    if ($remote) {
        my $merge = `git config --get "branch.${branch}.merge"`;
        chomp $merge;
        $merge =~ s@^refs/heads/@@;
        return "$remote/$merge";
    } else {
        return undef;
    }
}

sub update_if_fastforward ($) {
    my $branch = shift;
    system("git checkout $branch") == 0 or die();
    if (my $remote = get_remote($branch)) {
        my $theirs = 0, $ours = 0;
        for (`git rev-list --left-right "${branch}...${remote}" --`) {
            $theirs++ if /^>/;
            $ours++ if /^</;
        }
        if ($ours == 0) {
            system("git merge ${remote}") == 0 or die();
        } elsif ($theirs > 0) {
            die "E: ${branch} has diverged from ${remote}, fix manually!\nE: Maybe you should use 'git rebase ${remote}'\n";
        } else {
            print "I: ${branch} is ahead of ${remote} by ${ours} commits\n";
        }
    }
}

my $current = `git log -1 --pretty="%H"`;
chomp $current;
update_remotes();
for (`git branch`) {
    chomp;
    if (s/^\*\s+//) {
        # we will update the current branch at the end
        $current = $_ unless /no branch/;
    } else {
        s/^\s+//;
        update_if_fastforward($_);
    }
}
update_if_fastforward($current);