#!/usr/bin/perl -w

use strict;

my $reporoot;

my $verbose = 1;
my $ignore_failure = 0;

# --checked-out says we are pushing to a checked out tree
my $checked_out = 0;
# --push or --pull or --send?
my $push_pull_send = "push";

sub message {
    if ($verbose) {
        print "@_\n";
    }
}

sub warning {
    print "warning: @_\n";
}

sub darcs {
    message "== running darcs @_";
    system ("darcs", @_) == 0
        or $ignore_failure
        or die "darcs failed: $?";
}

sub darcs_push {
    darcs ($push_pull_send, "--no-set-default", @_);
}

sub pushall {
    my $dir;
    my $localpath;
    my $remotepath;
    my $path;
    my $tag;
    my @repos;
    
    open IN, "< packages" or die "Can't open packages file";
    @repos = <IN>;
    close IN;

    REPO: foreach (@repos) {
        chomp;
        if (/^([^# ]+) +(?:([^ ]+) +)?([^ ]+) +([^ ]+)$/) {
            $localpath = $1;
            $tag = defined($2) ? $2 : "";
            $remotepath = $3;

            if ($checked_out) {
                $path = "$reporoot/$localpath";
            }
            else {
                if ($remotepath =~ /^http:/) {
                    message "Ignoring $localpath; remote is http URL";
                    next REPO;
                }
                else {
                    $path = "$reporoot/$remotepath";
                }
            }

            if (-d "$localpath/_darcs") {
                darcs_push ($path, @_, "--repodir", $localpath);
            }
            elsif ($tag eq "") {
                message "== Required repo $localpath is missing! Skipping";
            }
            else {
                message "== $localpath repo not present; skipping";
            }
        }
        elsif (! /^(#.*)?$/) {
            die "Bad line: $_";
        }
    }
}

sub main {
    if (! -d "_darcs" || ! -d "compiler") {
        die "error: darcs-all must be run from the top level of the ghc tree."
    }

    if ($#_ ne -1) {
        while ($#_ ne -1) {
            my $arg = shift;
            # We handle -q here as well as lower down as we need to skip
            # over it if it comes before the darcs command
            if ($arg eq "-q") {
                $verbose = 0;
            }
            elsif ($arg eq "--ignore-failure") {
                $ignore_failure = 1;
            }
            elsif ($arg eq "--checked-out") {
                $checked_out = 1;
            }
            elsif ($arg eq "--push") {
                $push_pull_send = "push";
            }
            elsif ($arg eq "--pull") {
                $push_pull_send = "pull";
            }
            elsif ($arg eq "--send") {
                $push_pull_send = "send";
            }
            else {
                $reporoot = $arg;
                if (grep /^-q$/, @_) {
                    $verbose = 0;
                }
                last;
            }
        }
    }
    else {
        die "Where do you want to push to?";
    }

    pushall (@_);
}

main(@ARGV);