+       
+sub help { #{{{
+       exec($config{''}{DEFAULT}{help}) || die "exec: $!";
+} #}}}
+       
+sub config { #{{{
+       if (@_ < 2) {
+               die "mr config: not enough parameters\n";
+       }
+       my $section=shift;
+       if ($section=~/^\//) {
+               # try to convert to a path relative to the config file
+               my ($dir)=$ENV{MR_CONFIG}=~/^(.*\/)[^\/]+$/;
+               $dir=abs_path($dir);
+               $dir.="/" unless $dir=~/\/$/;
+               if ($section=~/^\Q$dir\E(.*)/) {
+                       $section=$1;
+               }
+       }
+       my %changefields;
+       foreach (@_) {
+               if (/^([^=]+)=(.*)$/) {
+                       $changefields{$1}=$2;
+               }
+               else {
+                       my $found=0;
+                       foreach my $topdir (sort keys %config) {
+                               if (exists $config{$topdir}{$section} &&
+                                   exists $config{$topdir}{$section}{$_}) {
+                                       print $config{$topdir}{$section}{$_}."\n";
+                                       $found=1;
+                                       last if $section eq 'DEFAULT';
+                               }
+                       }
+                       if (! $found) {
+                               die "mr config: $section $_ not set\n";
+                       }
+               }
+       }
+       modifyconfig($ENV{MR_CONFIG}, $section, %changefields) if %changefields;
+       exit 0;
+} #}}}
+
+sub register { #{{{
+       if (! $config_overridden) {
+               # Find the closest known mrconfig file to the current
+               # directory.
+               $directory.="/" unless $directory=~/\/$/;
+               foreach my $topdir (reverse sort keys %config) {
+                       next unless length $topdir;
+                       if ($directory=~/^\Q$topdir\E/) {
+                               $ENV{MR_CONFIG}=$configfiles{$topdir};
+                               $directory=$topdir;
+                               last;
+                       }
+               }
+       }
+       if (@ARGV) {
+               my $subdir=shift @ARGV;
+               if (! chdir($subdir)) {
+                       print STDERR "mr register: failed to chdir to $subdir: $!\n";
+               }
+       }
+
+       $ENV{MR_REPO}=getcwd();
+       my $command=findcommand("register", $ENV{MR_REPO}, $directory, 'DEFAULT');
+       if (! defined $command) {
+               die "mr register: unknown repository type\n";
+       }
+
+       $ENV{MR_REPO}=~s/.*\/(.*)/$1/;
+       $command="set -e; ".$config{$directory}{DEFAULT}{lib}."\n".
+               "my_action(){ $command\n }; my_action ".
+               join(" ", map { s/\//\/\//g; s/"/\"/g; '"'.$_.'"' } @ARGV);
+       print "mr register: running >>$command<<\n" if $verbose;
+       exec($command) || die "exec: $!";
+} #}}}
+
+# alias expansion and command stemming
+sub expandaction { #{{{
+       my $action=shift;
+       if (exists $alias{$action}) {
+               $action=$alias{$action};
+       }
+       if (! exists $knownactions{$action}) {
+               my @matches = grep { /^\Q$action\E/ }
+                       keys %knownactions, keys %alias;
+               if (@matches == 1) {
+                       $action=$matches[0];
+               }
+               elsif (@matches == 0) {
+                       die "mr: unknown action \"$action\" (known actions: ".
+                               join(", ", sort keys %knownactions).")\n";
+               }
+               else {
+                       die "mr: ambiguous action \"$action\" (matches: ".
+                               join(", ", @matches).")\n";
+               }
+       }
+       return $action;
+} #}}}
+
+sub getopts { #{{{
+       Getopt::Long::Configure("no_permute");
+       my $result=GetOptions(
+               "d|directory=s" => sub { $directory=abs_path($_[1]) },
+               "c|config=s" => sub { $ENV{MR_CONFIG}=$_[1]; $config_overridden=1 },
+               "v|verbose" => \$verbose,
+               "s|stats" => \$stats,
+               "n|no-recurse" => \$no_recurse,
+               "j|jobs=i" => \$jobs,
+       );
+       if (! $result || @ARGV < 1) {
+               die("Usage: mr [-d directory] action [params ...]\n".
+                   "(Use mr help for man page.)\n");
+       }
+} #}}}
+
+sub init { #{{{
+       $SIG{INT}=sub {
+               print STDERR "mr: interrupted\n";
+               exit 2;
+       };
+       
+       $ENV{MR_CONFIG}="$ENV{HOME}/.mrconfig";
+
+       # This can happen if it's run in a directory that was removed
+       # or other strangeness.
+       if (! defined $directory) {
+               die("mr: failed to determine working directory\n");
+       }
+       # Make sure MR_CONFIG is an absolute path, but don't use abs_path since
+       # the config file might be a symlink to elsewhere, and the directory it's
+       # in is significant.
+       if ($ENV{MR_CONFIG} !~ /^\//) {
+               $ENV{MR_CONFIG}=getcwd()."/".$ENV{MR_CONFIG};
+       }
+       # Try to set MR_PATH to the path to the program.
+       eval {
+               use FindBin qw($Bin $Script);
+               $ENV{MR_PATH}=$Bin."/".$Script;
+       };
+} #}}}
+
+sub main { #{{{
+       getopts();
+       init();
+       loadconfig(\*DATA);
+       loadconfig($ENV{MR_CONFIG});
+       #use Data::Dumper; print Dumper(\%config);
+
+       my $action=expandaction(shift @ARGV);
+       dispatch($action);
+       showstats($action);
+
+       if (@failed) {
+               exit 1;
+       }
+       elsif (! @ok && @skipped) {
+               exit 1;
+       }
+       else {
+               exit 0;
+       }
+} #}}}