#!/usr/bin/perl -w
#
# migrate gitosis.conf to gitolite.conf format
#
# Based on gl-conf-convert by: Sitaram Chamarty
# Rewritten by: Behan Webster <behanw@websterwood.com>
#

use strict;
use warnings;

if (not @ARGV and -t or @ARGV and $ARGV[0] eq '-h') {
    print "Usage:\n    gl-conf-convert < gitosis.conf > gitolite.conf\n(please see the documentation for details)\n";
    exit 1;
}

my @comments = ();
my $groupname;
my %groups;
my $reponame;
my %repos;

while (<>)
{
    # not supported
    if (/^repositories *=/ or /^map /) {
        print STDERR "not supported: $_";
        s/^/NOT SUPPORTED: /;
        print;
        next;
    }

    # normalise whitespace to help later regexes
    chomp;
    s/\s+/ /g;
    s/ ?= ?/ = /;
    s/^ //;
    s/ $//;

    if (/^\s*$/ and @comments > 1) {
        @{$repos{$reponame}{comments}} = @comments if $reponame;
        @{$groups{$groupname}{comments}} = @comments if $groupname;
        @comments = ();
    } elsif (/^\s*#/) {
        push @comments, $_;
    } elsif (/^\[repo\s+(.*?)\]$/) {
        $groupname = '';
        $reponame = $1;
        $reponame =~ s/\.git$//;
    } elsif (/^\[gitosis\]$/) {
        $groupname = '';
        $reponame = '@all';
    } elsif (/^gitweb\s*=\s*yes/i) {
        push @{$repos{$reponame}{R}}, 'gitweb';
    } elsif (/^daemon\s*=\s*yes/i) {
        push @{$repos{$reponame}{R}}, 'daemon';
    } elsif (/^description\s*=\s*(.+?)$/) {
        $repos{$reponame}{desc} = $1;
    } elsif (/^owner\s*=\s*(.+?)$/) {
        $repos{$reponame}{owner} = $1;
    } elsif (/^\[group\s+(.*)\]$/) {
        $reponame = '';
        $groupname = $1;
    } elsif (/^members\s*=\s*(.*)/) {
        push @{$groups{$groupname}{users}}, map {s/\@([^.]+)$/_$1/g; $_} split(' ', $1);
    } elsif (/^write?able\s*=\s*(.*)/) {
        foreach my $repo (split(' ', $1)) {
            $repo =~ s/\.git$//;
            push @{$repos{$repo}{RW}}, "\@$groupname";
        }
    } elsif (/^readonly\s*=\s*(.*)/) {
        foreach my $repo (split(' ', $1)) {
            $repo =~ s/\.git$//;
            push @{$repos{$repo}{R}}, "\@$groupname";
        }
    }
}

#use Data::Dumper;
#print Dumper(\%repos);
#print Dumper(\%groups);

# Groups
print "#\n# Groups\n#\n\n";
foreach my $grp (sort keys %groups) {
    next unless @{$groups{$grp}{users}};
    printf join("\n", @{$groups{$grp}{comments}})."\n" if $groups{$grp}{comments};
    printf "\@%-19s = %s\n", $grp, join(' ', @{$groups{$grp}{users}});
}

# Gitweb
print "\n#\n# Gitweb\n#\n\n";
foreach my $repo (sort keys %repos) {
    if ($repos{$repo}{desc}) {
        @{$repos{$repo}{R}} = grep(!/^gitweb$/, @{$repos{$repo}{R}});
        print $repo;
        print " \"$repos{$repo}{owner}\"" if $repos{$repo}{owner};
        print " = \"$repos{$repo}{desc}\"\n";
    }
}

# Repos
print "\n#\n# Repos\n#\n";
foreach my $repo (sort keys %repos) {
    print "\n";
    printf join("\n", @{$repos{$repo}{comments}})."\n" if $repos{$repo}{comments};
    #if ($repos{$repo}{desc}) {
    #    @{$repos{$repo}{R}} = grep(!/^gitweb$/, @{$repos{$repo}{R}});
    #}
    print "repo\t$repo\n";
    foreach my $access (qw(RW+ RW R)) {
        next unless $repos{$repo}{$access};
        my @keys;
        foreach my $key (@{$repos{$repo}{$access}}) {
            if ($key =~ /^\@(.*)/) {
                next unless defined $groups{$1} and @{$groups{$1}{users}};
            }
            push @keys, $key;
        }
        printf "\t$access\t= %s\n", join(' ', @keys) if @keys;
    }
    #if ($repos{$repo}{desc}) {
    #    print $repo;
    #    print " \"$repos{$repo}{owner}\"" if $repos{$repo}{owner};
    #    print " = \"$repos{$repo}{desc}\"\n";
    #}
}