X-Git-Url: https://git.madduck.net/code/myrepos.git/blobdiff_plain/e9de7f196a3b998952e8f62acb04a18d9f087d8a..1a2c28ad8b1aa4904916eff977756c6aaaa3b632:/mr?ds=sidebyside

diff --git a/mr b/mr
index bed4cac..e4beac8 100755
--- a/mr
+++ b/mr
@@ -1,5 +1,7 @@
 #!/usr/bin/perl
 
+#man{{{
+
 =head1 NAME
 
 mr - a Multiple Repository management tool
@@ -18,24 +20,26 @@ B<mr> [options] diff
 
 B<mr> [options] log
 
+B<mr> [options] register [repository]
+
+B<mr> [options] config section ["parameter=[value]" ...]
+
 B<mr> [options] action [params ...]
 
 =head1 DESCRIPTION
 
-B<mr> is a Multiple Repository management tool. It allows you to register a
-set of repositories in a .mrconfig file, and then checkout, update, or
-perform other actions on the repositories as if they were one big
-respository.
-
-Any mix of revision control systems can be used with B<mr>, and you can
-define arbitrary actions for commands like "update", "checkout", or "commit".
+B<mr> is a Multiple Repository management tool. It can checkout, update, or
+perform other actions on a set of repositories as if they were one combined
+respository. It supports any combination of subversion, git, cvs, mecurial,
+bzr and darcs repositories, and support for other revision control systems can
+easily be added.
 
-B<mr> cds into and operates on all registered repsitories at or below your
+B<mr> cds into and operates on all registered repositories at or below your
 working directory. Or, if you are in a subdirectory of a repository that
 contains no other registered repositories, it will stay in that directory,
 and work on only that repository,
 
-The predefined commands should be fairly familiar to users of any revision
+These predefined commands should be fairly familiar to users of any revision
 control system:
 
 =over 4
@@ -70,10 +74,47 @@ Show a diff of uncommitted changes.
 
 Show the commit log.
 
+=back
+
+These commands are also available:
+
+=over 4
+
 =item list (or ls)
 
 List the repositories that mr will act on.
 
+=item register
+
+Register an existing repository in a mrconfig file. By default, the
+repository in the current directory is registered, or you can specify a
+directory to register.
+
+The mrconfig file that is modified is chosen by either the -c option, or by
+looking for the closest known one at or below the current directory.
+
+=item config
+
+Adds, modifies, removes, or prints a value from a mrconfig file. The next
+parameter is the name of the section the value is in. To add or modify
+values, use one or more instances of "parameter=value". Use "parameter=" to
+remove a parameter. Use just "parameter" to get the value of a parameter.
+
+For example, to add (or edit) a repository in src/foo:
+
+  mr config src/foo checkout="svn co svn://example.com/foo/trunk foo"
+
+To show the command that mr uses to update the repository in src/foo:
+
+  mr config src/foo update
+
+To see the built-in library of shell functions contained in mr:
+
+  mr config DEFAULT lib
+
+The ~/.mrconfig file is used by default. To use a different config file,
+use the -c option.
+
 =item help
 
 Displays this help.
@@ -84,10 +125,10 @@ Actions can be abbreviated to any unambiguous subsctring, so
 "mr st" is equivilant to "mr status", and "mr up" is equivilant to "mr
 update"
 
-Additional parameters can be passed to other commands than "commit", they
-will be passed on unchanged to the underlying revision control system.
-This is mostly useful if the repositories mr will act on all use the same
-revision control system.
+Additional parameters can be passed to most commands, and are passed on
+unchanged to the underlying revision control system. This is mostly useful
+if the repositories mr will act on all use the same revision control
+system.
 
 =head1 OPTIONS
 
@@ -100,13 +141,36 @@ the current working directory.
 
 =item -c mrconfig
 
-Use the specified mrconfig file, instead of looking for one in your home
-directory.
+Use the specified mrconfig file. The default is B<~/.mrconfig>
 
 =item -v
 
 Be verbose.
 
+=item -s
+
+Expand the statistics line displayed at the end to include information
+about exactly which repositories failed and were skipped, if any.
+
+=item -n [number]
+
+If no number if specified, just operate on the repository for the current
+directory, do not recurse into deeper repositories.
+
+If a number is specified, will recurse into repositories at most that many
+subdirectories deep. For example, with -n 2 it would recurse into ./src/foo,
+but not ./src/packages/bar.
+
+=item -j [number]
+
+Run the specified number of jobs in parallel, or an unlimited number of jobs
+with no number specified. This can greatly speed up operations such as updates.
+It is not recommended for interactive operations.
+
+Note that running more than 10 jobs at a time is likely to run afoul of
+ssh connection limits. Running between 3 and 5 jobs at a time will yeild
+a good speedup in updates without loading the machine too much.
+
 =back
 
 =head1 FILES
@@ -122,10 +186,13 @@ Here is an example .mrconfig file:
   chain = true
 
   [src/linux-2.6]
-  checkout = git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
+  checkout = git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git &&
+  	cd linux-2.6 &&
+  	git checkout -b mybranch origin/master
 
 The .mrconfig file uses a variant of the INI file format. Lines starting with
-"#" are comments. Lines ending with "\" are continued on to the next line.
+"#" are comments. Values can be continued to the following line by
+indenting the line with whitespace.
 
 The "DEFAULT" section allows setting default values for the sections that
 come after it.
@@ -139,17 +206,24 @@ that contains the mrconfig file, but you can also choose to use absolute
 paths.
 
 Within a section, each parameter defines a shell command to run to handle a
-given action. mr contains default handlers for the "update", "status", and
-"commit" actions, so normally you only need to specify what to do for
-"checkout".
+given action. mr contains default handlers for "update", "status",
+"commit", and other standard actions. Normally you only need to specify what
+to do for "checkout".
 
 Note that these shell commands are run in a "set -e" shell
 environment, where any additional parameters you pass are available in
 "$@". The "checkout" command is run in the parent of the repository
 directory, since the repository isn't checked out yet. All other commands
 are run inside the repository, though not necessarily at the top of it.
+
 The "MR_REPO" environment variable is set to the path to the top of the
-repository.
+repository. (For the "register" action, "MR_REPO" is instead set to the 
+basename of the directory that should be created when checking the
+repository out.)
+
+The "MR_CONFIG" environment variable is set to the .mrconfig file
+that defines the repo being acted on, or, if the repo is not yet in a config
+file, the .mrconfig file that should be modified to register the repo.
 
 A few parameters have special meanings:
 
@@ -157,15 +231,43 @@ A few parameters have special meanings:
 
 =item skip
 
-If the "skip" parameter is set and its command returns nonzero, then B<mr>
-will skip acting on that repository.
+If the "skip" parameter is set and its command returns true, then B<mr>
+will skip acting on that repository. The command is passed the action
+name in $1.
+
+Here are two examples. The first skips the repo unless
+mr is run by joey. The second uses the hours_since function
+(included in mr's built-in library) to skip updating the repo unless it's
+been at least 12 hours since the last update.
+
+  skip = test `whoami` != joey
+  skip = [ "$1" = update ] && ! hours_since "$1" 12
+
+=item order
+
+The "order" parameter can be used to override the default ordering of
+repositories. The default order value is 10. Use smaller values to make
+repositories be processed earlier, and larger values to make repositories
+be processed later.
+
+Note that if a repository is located in a subdirectory of another
+repository, ordering it to be processed earlier is not recommended.
 
 =item chain
 
-If the "chain" parameter is set and its command returns nonzero, then B<mr>
+If the "chain" parameter is set and its command returns true, then B<mr>
 will try to load a .mrconfig file from the root of the repository. (You
 should avoid chaining from repositories with untrusted committers.)
 
+=item include
+
+If the "include" parameter is set, its command is ran, and should output
+additional mrconfig file content. The content is included as if it were
+part of the including file.
+
+Unlike all other parameters, this parameter does not need to be placed
+within a section.
+
 =item lib
 
 The "lib" parameter can specify some shell code that will be run before each
@@ -174,6 +276,18 @@ to use.
 
 =back
 
+When looking for a command to run for a given action, mr first looks for
+a parameter with the same name as the action. If that is not found, it
+looks for a parameter named "rcs_action" (substituting in the name of the
+revision control system and the action). The name of the revision control
+system is itself determined by running each defined "rcs_test" action,
+until one succeeds.
+
+Internally, mr has settings for "git_update", "svn_update", etc. To change
+the action that is performed for a given revision control system, you can
+override these rcs specific actions. To add a new revision control system,
+you can just add rcs specific actions for it.
+
 =head1 AUTHOR
 
 Copyright 2007 Joey Hess <joey@kitenet.net>
@@ -184,174 +298,325 @@ http://kitenet.net/~joey/code/mr/
 
 =cut
 
+#}}}
+
 use warnings;
 use strict;
 use Getopt::Long;
 use Cwd qw(getcwd abs_path);
 
-my $directory=getcwd();
-my $config="$ENV{HOME}/.mrconfig";
+# things that can happen when mr runs a command
+use constant {
+	OK => 0,
+	FAILED => 1,
+	SKIPPED => 2,
+	ABORT => 3,
+};
+
+# configurables
+my $config_overridden=0;
 my $verbose=0;
+my $stats=0;
+my $max_depth;
+my $no_chdir=0;
+my $jobs=1;
+my $directory=getcwd();
+$ENV{MR_CONFIG}="$ENV{HOME}/.mrconfig";
+
+# globals :-(
 my %config;
+my %configfiles;
 my %knownactions;
 my %alias;
+my (@ok, @failed, @skipped);
 
-Getopt::Long::Configure("no_permute");
-my $result=GetOptions(
-	"d|directory=s" => sub { $directory=abs_path($_[1]) },
-	"c|config=s" => \$config,
-	"verbose" => \$verbose,
-);
-if (! $result || @ARGV < 1) {
-	die("Usage: mr [-d directory] action [params ...]\n".
-	    "(Use mr help for man page.)\n");
-
-}
-
-loadconfig(\*DATA);
-loadconfig($config);
-#use Data::Dumper;
-#print Dumper(\%config);
-
-eval {
-	use FindBin qw($Bin $Script);
-	$ENV{MR_PATH}=$Bin."/".$Script;
-};
+main();
 
-# alias expansion and command stemming
-my $action=shift @ARGV;
-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 \"$action\" (known actions: ".
-			join(", ", sort keys %knownactions).")\n";
+my %rcs;
+sub rcs_test { #{{{
+	my ($action, $dir, $topdir, $subdir) = @_;
+
+	if (exists $rcs{$dir}) {
+		return $rcs{$dir};
+	}
+
+	my $test="set -e\n";
+	foreach my $rcs_test (
+			sort {
+				length $a <=> length $b 
+				          ||
+				       $a cmp $b
+			} grep { /_test$/ } keys %{$config{$topdir}{$subdir}}) {
+		my ($rcs)=$rcs_test=~/(.*)_test/;
+		$test="my_$rcs_test() {\n$config{$topdir}{$subdir}{$rcs_test}\n}\n".$test;
+		$test.="if my_$rcs_test; then echo $rcs; fi\n";
+	}
+	$test=$config{$topdir}{$subdir}{lib}."\n".$test
+		if exists $config{$topdir}{$subdir}{lib};
+	
+	print "mr $action: running rcs test >>$test<<\n" if $verbose;
+	my $rcs=`$test`;
+	chomp $rcs;
+	if ($rcs=~/\n/s) {
+		$rcs=~s/\n/, /g;
+		print STDERR "mr $action: found multiple possible repository types ($rcs) for $topdir$subdir\n";
+		return undef;
+	}
+	if (! length $rcs) {
+		return $rcs{$dir}=undef;
 	}
 	else {
-		die "mr: ambiguous action \"$action\" (matches: ".
-			join(", ", @matches).")\n";
+		return $rcs{$dir}=$rcs;
+	}
+} #}}}
+	
+sub findcommand { #{{{
+	my ($action, $dir, $topdir, $subdir, $is_checkout) = @_;
+	
+	if (exists $config{$topdir}{$subdir}{$action}) {
+		return $config{$topdir}{$subdir}{$action};
 	}
-}
 
-if ($action eq 'help') {
-	exec($config{''}{DEFAULT}{help});
-}
+	if ($is_checkout) {
+		return undef;
+	}
 
-# work out what repos to act on
-my @repos;
-my $nochdir=0;
-foreach my $topdir (sort keys %config) {
-	foreach my $subdir (sort keys %{$config{$topdir}}) {
-		next if $subdir eq 'DEFAULT';
-		my $dir=($subdir =~/^\//) ? $subdir : $topdir.$subdir;
-		my $d=$directory;
-		$dir.="/" unless $dir=~/\/$/;
-		$d.="/" unless $d=~/\/$/;
-		next if $dir ne $directory && $dir !~ /^\Q$directory\E/;
-		push @repos, [$dir, $topdir, $subdir];
+	my $rcs=rcs_test(@_);
+
+	if (defined $rcs && 
+	    exists $config{$topdir}{$subdir}{$rcs."_".$action}) {
+		return $config{$topdir}{$subdir}{$rcs."_".$action};
 	}
-}
-if (! @repos) {
-	# fallback to find a leaf repo
-	LEAF: foreach my $topdir (reverse sort keys %config) {
-		foreach my $subdir (reverse sort keys %{$config{$topdir}}) {
-			next if $subdir eq 'DEFAULT';
-			my $dir=($subdir =~/^\//) ? $subdir : $topdir.$subdir;
-			my $d=$directory;
-			$dir.="/" unless $dir=~/\/$/;
-			$d.="/" unless $d=~/\/$/;
-			if ($d=~/^\Q$dir\E/) {
-				push @repos, [$dir, $topdir, $subdir];
-				last LEAF;
-			}
-		}
+	else {
+		return undef;
 	}
-	$nochdir=1;
-}
+} #}}}
 
-my (@failed, @successful, @skipped);
-foreach my $repo (@repos) {
-	action($action, @$repo);
-}
-
-sub action {
+sub action { #{{{
 	my ($action, $dir, $topdir, $subdir) = @_;
-	
-	my $lib= exists $config{$topdir}{$subdir}{lib} ?
-	                $config{$topdir}{$subdir}{lib}."\n" : "";
 
-	if ($action eq 'checkout') {
+	$ENV{MR_CONFIG}=$configfiles{$topdir};
+	my $lib=exists $config{$topdir}{$subdir}{lib} ?
+	               $config{$topdir}{$subdir}{lib}."\n" : "";
+	my $is_checkout=($action eq 'checkout');
+
+	if ($is_checkout) {
 		if (-d $dir) {
 			print "mr $action: $dir already exists, skipping checkout\n" if $verbose;
-			push @skipped, $dir;
-			return;
+			return SKIPPED;
 		}
+
 		$dir=~s/^(.*)\/[^\/]+\/?$/$1/;
 	}
-	elsif ($action eq 'update') {
+	elsif ($action =~ /update/) {
 		if (! -d $dir) {
 			return action("checkout", $dir, $topdir, $subdir);
 		}
 	}
-	
+
 	$ENV{MR_REPO}=$dir;
 
-	if (exists $config{$topdir}{$subdir}{skip}) {
-		my $test="set -e;".$lib.$config{$topdir}{$subdir}{skip};
+	my $skiptest=findcommand("skip", $dir, $topdir, $subdir, $is_checkout);
+	my $command=findcommand($action, $dir, $topdir, $subdir, $is_checkout);
+
+	if (defined $skiptest) {
+		my $test="set -e;".$lib.
+			"my_action(){ $skiptest\n }; my_action '$action'";
 		print "mr $action: running skip test >>$test<<\n" if $verbose;
 		my $ret=system($test);
+		if ($ret != 0) {
+			if (($? & 127) == 2) {
+				print STDERR "mr $action: interrupted\n";
+				return ABORT;
+			}
+			elsif ($? & 127) {
+				print STDERR "mr $action: skip test received signal ".($? & 127)."\n";
+				return ABORT;
+			}
+		}
 		if ($ret >> 8 == 0) {
 			print "mr $action: $dir skipped per config file\n" if $verbose;
-			push @skipped, $dir;
-			return;
+			return SKIPPED;
 		}
 	}
-	
-	if (! $nochdir && ! chdir($dir)) {
+
+	if ($is_checkout && ! -d $dir) {
+		print "mr $action: creating parent directory $dir\n" if $verbose;
+		system("mkdir", "-p", $dir);
+	}
+
+	if (! $no_chdir && ! chdir($dir)) {
 		print STDERR "mr $action: failed to chdir to $dir: $!\n";
-		push @failed, $dir;
+		return FAILED;
 	}
-	elsif (! exists $config{$topdir}{$subdir}{$action}) {
-		print STDERR "mr $action: no defined $action command for $topdir$subdir, skipping\n";
-		push @skipped, $dir;
+	elsif (! defined $command) {
+		my $rcs=rcs_test(@_);
+		if (! defined $rcs) {
+			print STDERR "mr $action: unknown repository type and no defined $action command for $topdir$subdir\n";
+			return FAILED;
+		}
+		else {
+			print STDERR "mr $action: no defined action for $rcs repository $topdir$subdir, skipping\n";
+			return SKIPPED;
+		}
 	}
 	else {
-		if (! $nochdir) {
+		if (! $no_chdir) {
 			print "mr $action: $topdir$subdir\n";
 		}
 		else {
-			print "mr $action: $topdir$subdir (in subdir $directory)\n";
+			my $s=$directory;
+			$s=~s/^\Q$topdir$subdir\E\/?//;
+			print "mr $action: $topdir$subdir (in subdir $s)\n";
 		}
-		my $command="set -e; ".$lib.
-			"my_action(){ $config{$topdir}{$subdir}{$action}\n }; my_action ".
+		$command="set -e; ".$lib.
+			"my_action(){ $command\n }; my_action ".
 			join(" ", map { s/\//\/\//g; s/"/\"/g; '"'.$_.'"' } @ARGV);
-		print STDERR "mr $action: running >>$command<<\n" if $verbose;
+		print "mr $action: running >>$command<<\n" if $verbose;
 		my $ret=system($command);
 		if ($ret != 0) {
+			if (($? & 127) == 2) {
+				print STDERR "mr $action: interrupted\n";
+				return ABORT;
+			}
+			elsif ($? & 127) {
+				print STDERR "mr $action: received signal ".($? & 127)."\n";
+				return ABORT;
+			}
 			print STDERR "mr $action: failed ($ret)\n" if $verbose;
-			push @failed, $dir;
 			if ($ret >> 8 != 0) {
 				print STDERR "mr $action: command failed\n";
 			}
 			elsif ($ret != 0) {
 				print STDERR "mr $action: command died ($ret)\n";
 			}
+			return FAILED;
 		}
 		else {
-			push @successful, $dir;
+			if ($action eq 'checkout' && ! -d $dir) {
+				print STDERR "mr $action: $dir missing after checkout\n";;
+				return FAILED;
+			}
+
+			return OK;
 		}
+	}
+} #}}}
+
+# run actions on multiple repos, in parallel
+sub mrs { #{{{
+	my $action=shift;
+	my @repos=@_;
+
+	$| = 1;
+	my @active;
+	my @fhs;
+	my @out;
+	my $running=0;
+	while (@fhs or @repos) {
+		while ((!$jobs || $running < $jobs) && @repos) {
+			$running++;
+			my $repo = shift @repos;
+			pipe(my $outfh, CHILD_STDOUT);
+			pipe(my $errfh, CHILD_STDERR);
+			my $pid;
+			unless ($pid = fork) {
+				die "mr $action: cannot fork: $!" unless defined $pid;
+				open(STDOUT, ">&CHILD_STDOUT") || die "mr $action cannot reopen stdout: $!";
+				open(STDERR, ">&CHILD_STDERR") || die "mr $action cannot reopen stderr: $!";
+				close CHILD_STDOUT;
+				close CHILD_STDERR;
+				close $outfh;
+				close $errfh;
+				exit action($action, @$repo);
+			}
+			close CHILD_STDOUT;
+			close CHILD_STDERR;
+			push @active, [$pid, $repo];
+			push @fhs, [$outfh, $errfh];
+			push @out, ['',     ''];
+		}
+		my ($rin, $rout) = ('','');
+		my $nfound;
+		foreach my $fh (@fhs) {
+			next unless defined $fh;
+			vec($rin, fileno($fh->[0]), 1) = 1 if defined $fh->[0];
+			vec($rin, fileno($fh->[1]), 1) = 1 if defined $fh->[1];
+		}
+		$nfound = select($rout=$rin, undef, undef, 1);
+		foreach my $channel (0, 1) {
+			foreach my $i (0..$#fhs) {
+				next unless defined $fhs[$i];
+				my $fh = $fhs[$i][$channel];
+				next unless defined $fh;
+				if (vec($rout, fileno($fh), 1) == 1) {
+					my $r = '';
+					if (sysread($fh, $r, 1024) == 0) {
+						close($fh);
+						$fhs[$i][$channel] = undef;
+						if (! defined $fhs[$i][0] &&
+						    ! defined $fhs[$i][1]) {
+						    	waitpid($active[$i][0], 0);
+							print STDOUT $out[$i][0];
+							print STDERR $out[$i][1];
+							record($active[$i][1], $? >> 8);
+						    	splice(@fhs, $i, 1);
+						    	splice(@active, $i, 1);
+						    	splice(@out, $i, 1);
+							$running--;
+						}
+					}
+					$out[$i][$channel] .= $r;
+				}
+			}
+		}
+	}
+} #}}}
+
+sub record { #{{{
+	my $dir=shift()->[0];
+	my $ret=shift;
 
+	if ($ret == OK) {
+		push @ok, $dir;
 		print "\n";
 	}
-}
+	elsif ($ret == FAILED) {
+		push @failed, $dir;
+		print "\n";
+	}
+	elsif ($ret == SKIPPED) {
+		push @skipped, $dir;
+	}
+	elsif ($ret == ABORT) {
+		exit 1;
+	}
+	else {
+		die "unknown exit status $ret";
+	}
+} #}}}
 
-sub showstat {
+sub showstats { #{{{
+	my $action=shift;
+	if (! @ok && ! @failed && ! @skipped) {
+		die "mr $action: no repositories found to work on\n";
+	}
+	print "mr $action: finished (".join("; ",
+		showstat($#ok+1, "ok", "ok"),
+		showstat($#failed+1, "failed", "failed"),
+		showstat($#skipped+1, "skipped", "skipped"),
+	).")\n";
+	if ($stats) {
+		if (@skipped) {
+			print "mr $action: (skipped: ".join(" ", @skipped).")\n";
+		}
+		if (@failed) {
+			print STDERR "mr $action: (failed: ".join(" ", @failed).")\n";
+		}
+	}
+} #}}}
+
+sub showstat { #{{{
 	my $count=shift;
 	my $singular=shift;
 	my $plural=shift;
@@ -359,25 +624,73 @@ sub showstat {
 		return "$count ".($count > 1 ? $plural : $singular);
 	}
 	return;
-}
-if (! @successful && ! @failed && ! @skipped) {
-	die "mr $action: no repositories found to work on\n";
-}
-print "mr $action: finished (".join("; ",
-	showstat($#successful+1, "successful", "successful"),
-	showstat($#failed+1, "failed", "failed"),
-	showstat($#skipped+1, "skipped", "skipped"),
-).")\n";
-if (@failed) {
-	exit 1;
-}
-elsif (! @successful && @skipped) {
-	exit 1;
-}
-exit 0;
+} #}}}
+
+# an ordered list of repos
+sub repolist { #{{{
+	my @list;
+	foreach my $topdir (sort keys %config) {
+		foreach my $subdir (sort keys %{$config{$topdir}}) {
+			push @list, {
+				topdir => $topdir,
+				subdir => $subdir,
+				order => $config{$topdir}{$subdir}{order},
+			};
+		}
+	}
+	return sort {
+		$a->{order}  <=> $b->{order}
+		             ||
+		$a->{topdir} cmp $b->{topdir}
+		             ||
+		$a->{subdir} cmp $b->{subdir}
+	} @list;
+} #}}}
+
+# figure out which repos to act on
+sub selectrepos { #{{{
+	my @repos;
+	foreach my $repo (repolist()) {
+		my $topdir=$repo->{topdir};
+		my $subdir=$repo->{subdir};
+
+		next if $subdir eq 'DEFAULT';
+		my $dir=($subdir =~/^\//) ? $subdir : $topdir.$subdir;
+		my $d=$directory;
+		$dir.="/" unless $dir=~/\/$/;
+		$d.="/" unless $d=~/\/$/;
+		next if $dir ne $d && $dir !~ /^\Q$d\E/;
+		if (defined $max_depth) {
+			my @a=split('/', $dir);
+			my @b=split('/', $d);
+			do { } while (@a && @b && shift(@a) eq shift(@b));
+			next if @a > $max_depth || @b > $max_depth;
+		}
+		push @repos, [$dir, $topdir, $subdir];
+	}
+	if (! @repos) {
+		# fallback to find a leaf repo
+		foreach my $repo (reverse repolist()) {
+			my $topdir=$repo->{topdir};
+			my $subdir=$repo->{subdir};
+			
+			next if $subdir eq 'DEFAULT';
+			my $dir=($subdir =~/^\//) ? $subdir : $topdir.$subdir;
+			my $d=$directory;
+			$dir.="/" unless $dir=~/\/$/;
+			$d.="/" unless $d=~/\/$/;
+			if ($d=~/^\Q$dir\E/) {
+				push @repos, [$dir, $topdir, $subdir];
+				last;
+			}
+		}
+		$no_chdir=1;
+	}
+	return @repos;
+} #}}}
 
 my %loaded;
-sub loadconfig {
+sub loadconfig { #{{{
 	my $f=shift;
 
 	my @toload;
@@ -385,53 +698,77 @@ sub loadconfig {
 	my $in;
 	my $dir;
 	if (ref $f eq 'GLOB') {
-		$in=$f;	
 		$dir="";
+		$in=$f;	
 	}
 	else {
-		# $f might be a symlink
+		if (! -e $f) {
+			return;
+		}
+
 		my $absf=abs_path($f);
 		if ($loaded{$absf}) {
 			return;
 		}
 		$loaded{$absf}=1;
 
-		print "mr: loading config $f\n" if $verbose;
-		open($in, "<", $f) || die "mr: open $f: $!\n";
 		($dir)=$f=~/^(.*\/)[^\/]+$/;
 		if (! defined $dir) {
 			$dir=".";
 		}
 		$dir=abs_path($dir)."/";
+		
+		if (! exists $configfiles{$dir}) {
+			$configfiles{$dir}=$f;
+		}
 
 		# copy in defaults from first parent
 		my $parent=$dir;
-		while ($parent=~s/^(.*)\/[^\/]+\/?$/$1/) {
+		while ($parent=~s/^(.*\/)[^\/]+\/?$/$1/) {
+			if ($parent eq '/') {
+				$parent="";
+			}
 			if (exists $config{$parent} &&
 			    exists $config{$parent}{DEFAULT}) {
 				$config{$dir}{DEFAULT}={ %{$config{$parent}{DEFAULT}} };
 				last;
 			}
 		}
+		
+		print "mr: loading config $f\n" if $verbose;
+		open($in, "<", $f) || die "mr: open $f: $!\n";
 	}
+	my @lines=<$in>;
+	close $in;
 
 	my $section;
-	while (<$in>) {
+	my $line=0;
+	while (@lines) {
+		$_=shift @lines;
+		$line++;
 		chomp;
 		next if /^\s*\#/ || /^\s*$/;
-		if (/^\s*\[([^\]]*)\]\s*$/) {
+		if (/^\[([^\]]*)\]\s*$/) {
 			$section=$1;
 		}
-		elsif (/^\s*(\w+)\s*=\s*(.*)/) {
+		elsif (/^(\w+)\s*=\s*(.*)/) {
 			my $parameter=$1;
 			my $value=$2;
 
-			# continuation line
-			while ($value=~/(.*)\\$/s) {
-				$value=$1."\n".<$in>;
+			# continued value
+			while (@lines && $lines[0]=~/^\s(.+)/) {
+				shift(@lines);
+				$line++;
+				$value.="\n$1";
 				chomp $value;
 			}
 
+			if ($parameter eq "include") {
+				print "mr: including output of \"$value\"\n" if $verbose;
+				unshift @lines, `$value`;
+				next;
+			}
+
 			if (! defined $section) {
 				die "$f line $.: parameter ($parameter) not in section\n";
 			}
@@ -449,109 +786,477 @@ sub loadconfig {
 			}
 			else {
 				$config{$dir}{$section}{$parameter}=$value;
-				$knownactions{$parameter}=1;
+				if ($parameter =~ /.*_(.*)/) {
+					$knownactions{$1}=1;
+				}
+				else {
+					$knownactions{$parameter}=1;
+				}
 				if ($parameter eq 'chain' &&
 				    length $dir && $section ne "DEFAULT" &&
-				    -e $dir.$section."/.mrconfig" &&
-			    	    system($value) >> 8 == 0) {
-					push @toload, $dir.$section."/.mrconfig";
+				    -e $dir.$section."/.mrconfig") {
+					my $ret=system($value);
+					if ($ret != 0) {
+						if (($? & 127) == 2) {
+							print STDERR "mr: chain test interrupted\n";
+							exit 2;
+						}
+						elsif ($? & 127) {
+							print STDERR "mr: chain test received signal ".($? & 127)."\n";
+						}
+					}
+					else {
+						push @toload, $dir.$section."/.mrconfig";
+					}
 			        }
 			}
 		}
 		else {
-			die "$f line $.: parse error\n";
+			die "$f line $line: parse error\n";
 		}
 	}
-	close $in;
 
 	foreach (@toload) {
 		loadconfig($_);
 	}
-}
+} #}}}
+
+sub modifyconfig { #{{{
+	my $f=shift;
+	# the section to modify or add
+	my $targetsection=shift;
+	# fields to change in the section
+	# To remove a field, set its value to "".
+	my %changefields=@_;
+
+	my @lines;
+	my @out;
+
+	if (-e $f) {
+		open(my $in, "<", $f) || die "mr: open $f: $!\n";
+		@lines=<$in>;
+		close $in;
+	}
+
+	my $formatfield=sub {
+		my $field=shift;
+		my @value=split(/\n/, shift);
+
+		return "$field = ".shift(@value)."\n".
+			join("", map { "\t$_\n" } @value);
+	};
+	my $addfields=sub {
+		my @blanks;
+		while ($out[$#out] =~ /^\s*$/) {
+			unshift @blanks, pop @out;
+		}
+		foreach my $field (sort keys %changefields) {
+			if (length $changefields{$field}) {
+				push @out, "$field = $changefields{$field}\n";
+				delete $changefields{$field};
+			}
+		}
+		push @out, @blanks;
+	};
+
+	my $section;
+	while (@lines) {
+		$_=shift(@lines);
+
+		if (/^\s*\#/ || /^\s*$/) {
+			push @out, $_;
+		}
+		elsif (/^\[([^\]]*)\]\s*$/) {
+			if (defined $section && 
+			    $section eq $targetsection) {
+				$addfields->();
+			}
+
+			$section=$1;
+
+			push @out, $_;
+		}
+		elsif (/^(\w+)\s*=\s(.*)/) {
+			my $parameter=$1;
+			my $value=$2;
+
+			# continued value
+			while (@lines && $lines[0]=~/^\s(.+)/) {
+				shift(@lines);
+				$value.="\n$1";
+				chomp $value;
+			}
+
+			if ($section eq $targetsection) {
+				if (exists $changefields{$parameter}) {
+					if (length $changefields{$parameter}) {
+						$value=$changefields{$parameter};
+					}
+					delete $changefields{$parameter};
+				}
+			}
+
+			push @out, $formatfield->($parameter, $value);
+		}
+	}
+
+	if (defined $section && 
+	    $section eq $targetsection) {
+		$addfields->();
+	}
+	elsif (%changefields) {
+		push @out, "\n[$targetsection]\n";
+		foreach my $field (sort keys %changefields) {
+			if (length $changefields{$field}) {
+				push @out, $formatfield->($field, $changefields{$field});
+			}
+		}
+	}
+
+	open(my $out, ">", $f) || die "mr: write $f: $!\n";
+	print $out @out;
+	close $out;	
+} #}}}
+
+sub dispatch { #{{{
+	my $action=shift;
+
+	# actions that do not operate on all repos
+	if ($action eq 'help') {
+		help(@ARGV);
+	}
+	elsif ($action eq 'config') {
+		config(@ARGV);
+	}
+	elsif ($action eq 'register') {
+		register(@ARGV);
+	}
+
+	if (!$jobs || $jobs > 1) {
+		mrs($action, selectrepos());
+	}
+	else {
+		foreach my $repo (selectrepos()) {
+			record($repo, action($action, @$repo));
+		}
+	}
+} #}}}
+
+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 $directory=~/\/$/;
+		my $foundconfig=0;
+		foreach my $topdir (reverse sort keys %config) {
+			next unless length $topdir;
+			if ($directory=~/^\Q$topdir\E/) {
+				$ENV{MR_CONFIG}=$configfiles{$topdir};
+				$directory=$topdir;
+				$foundconfig=1;
+				last;
+			}
+		}
+		if (! $foundconfig) {
+			$directory=""; # no config file, use builtin
+		}
+	}
+	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', 0);
+	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("bundling", "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:i" => \$max_depth,
+		"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;
+	};
+	
+	# 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;
+	}
+} #}}}
 
 # Finally, some useful actions that mr knows about by default.
 # These can be overridden in ~/.mrconfig.
+#DATA{{{
 __DATA__
 [ALIAS]
-	co = checkout
-	ci = commit
-	ls = list
+co = checkout
+ci = commit
+ls = list
 
 [DEFAULT]
-lib =							\
-	error() {					\
-		echo "mr: $@" >&2			\
-		exit 1					\
-	}
-
-update =						\
-	if [ -d "$MR_REPO"/.svn ]; then			\
-		svn update "$@"				\
-	elif [ -d "$MR_REPO"/.git ]; then		\
-		git pull origin master "$@"		\
-	elif [ -d "$MR_REPO"/.bzr ]; then		\
-		bzr merge "$@"				\
-	elif [ -d "$MR_REPO"/CVS ]; then		\
-		cvs update "$@"				\
-	else						\
-		error "unknown repo type"		\
+order = 10
+lib =
+	error() {
+		echo "mr: $@" >&2
+		exit 1
+	}
+	warning() {
+		echo "mr (warning): $@" >&2
+	}
+	info() {
+		echo "mr: $@" >&2
+	}
+	hours_since() {
+		if [ -z "$1" ] || [ -z "$2" ]; then
+			error "mr: usage: hours_since action num"
+		fi
+		for dir in .git .svn .bzr CVS .hg _darcs; do
+			if [ -e "$MR_REPO/$dir" ]; then
+				flagfile="$MR_REPO/$dir/.mr_last$1"
+				break
+			fi
+		done
+		if [ -z "$flagfile" ]; then
+			error "cannot determine flag filename"
+		fi
+		delta=`perl -wle 'print -f shift() ? int((-M _) * 24) : 9999' "$flagfile"`
+		if [ "$delta" -lt "$2" ]; then
+			exit 0
+		else
+			touch "$flagfile"
+			exit 1
+		fi
+	}
+
+svn_test = test -d "$MR_REPO"/.svn
+git_test = test -d "$MR_REPO"/.git
+bzr_test = test -d "$MR_REPO"/.bzr
+cvs_test = test -d "$MR_REPO"/CVS
+hg_test  = test -d "$MR_REPO"/.hg
+darcs_test = test -d "$MR_REPO"/_darcs
+git_bare_test =
+	test -d "$MR_REPO"/refs/heads && test -d "$MR_REPO"/refs/tags &&
+	test -d "$MR_REPO"/objects && test -f "$MR_REPO"/config &&
+	test "`GIT_CONFIG="$MR_REPO"/config git config --get core.bare`" = true
+
+svn_update = svn update "$@"
+git_update = if [ "$@" ]; then git pull "$@"; else git pull -t origin master; fi
+bzr_update = bzr merge "$@"
+cvs_update = cvs update "$@"
+hg_update  = hg pull "$@" && hg update "$@"
+darcs_update = darcs pull -a "$@"
+
+svn_status = svn status "$@"
+git_status = git status "$@" || true
+bzr_status = bzr status "$@"
+cvs_status = cvs status "$@"
+hg_status  = hg status "$@"
+darcs_status = darcs whatsnew -ls "$@"
+
+svn_commit = svn commit "$@"
+git_commit = git commit -a "$@" && git push --all
+bzr_commit = bzr commit "$@" && bzr push
+cvs_commit = cvs commit "$@"
+hg_commit  = hg commit -m "$@" && hg push
+darcs_commit = darcs commit -a -m "$@" && darcs push -a
+
+svn_diff = svn diff "$@"
+git_diff = git diff "$@"
+bzr_diff = bzr diff "$@"
+cvs_diff = cvs diff "$@"
+hg_diff  = hg diff "$@"
+darcs_diff = darcs diff "$@"
+
+svn_log = svn log "$@"
+git_log = git log "$@"
+bzr_log = bzr log "$@"
+cvs_log = cvs log "$@"
+hg_log  = hg log "$@"
+darcs_log = darcs changes "$@"
+git_bare_log = git log "$@"
+
+svn_register =
+	url=`LC_ALL=C svn info . | grep -i '^URL:' | cut -d ' ' -f 2`
+	if [ -z "$url" ]; then
+		error "cannot determine svn url"
 	fi
-status =						\
-	if [ -d "$MR_REPO"/.svn ]; then			\
-		svn status "$@"				\
-	elif [ -d "$MR_REPO"/.git ]; then		\
-		git status "$@" || true			\
-	elif [ -d "$MR_REPO"/.bzr ]; then		\
-		bzr status "$@"				\
-	elif [ -d "$MR_REPO"/CVS ]; then		\
-		cvs status "$@"				\
-	else						\
-		error "unknown repo type"		\
+	echo "Registering svn url: $url in $MR_CONFIG"
+	mr -c "$MR_CONFIG" config "`pwd`" checkout="svn co '$url' '$MR_REPO'"
+git_register = 
+	url="`LC_ALL=C git config --get remote.origin.url`" || true
+	if [ -z "$url" ]; then
+		error "cannot determine git url"
 	fi
-commit =						\
-	if [ -d "$MR_REPO"/.svn ]; then			\
-		svn commit "$@"				\
-	elif [ -d "$MR_REPO"/.git ]; then		\
-		git commit -a "$@" && git push --all	\
-	elif [ -d "$MR_REPO"/.bzr ]; then		\
-		bzr commit "$@" && bzr push		\
-	elif [ -d "$MR_REPO"/CVS ]; then		\
-		cvs commit "$@"				\
-	else						\
-		error "unknown repo type"		\
+	echo "Registering git url: $url in $MR_CONFIG"
+	mr -c "$MR_CONFIG" config "`pwd`" checkout="git clone '$url' '$MR_REPO'"
+bzr_register =
+	url=`cat .bzr/branch/parent`
+	if [ -z "$url" ]; then
+		error "cannot determine bzr url"
 	fi
-diff =							\
-	if [ -d "$MR_REPO"/.svn ]; then			\
-		svn diff "$@"				\
-	elif [ -d "$MR_REPO"/.git ]; then		\
-		git diff "$@"				\
-	elif [ -d "$MR_REPO"/.bzr ]; then		\
-		bzr diff "$@"				\
-	elif [ -d "$MR_REPO"/CVS ]; then		\
-		cvs diff "$@"				\
-	else						\
-		error "unknown repo type"		\
+	echo "Registering bzr url: $url in $MR_CONFIG"
+	mr -c "$MR_CONFIG" config "`pwd`" checkout="bzr clone '$url' '$MR_REPO'"
+cvs_register =
+	repo=`cat CVS/Repository`
+	root=`cat CVS/Root`
+	if [ -z "$root" ]; then
+		error "cannot determine cvs root"
+		fi
+	echo "Registering cvs repository $repo at root $root"
+	mr -c "$MR_CONFIG" config "`pwd`" checkout="cvs -d '$root' co -d '$MR_REPO' '$repo'"
+hg_register = 
+	url=`hg showconfig paths.default`
+	echo "Registering mercurial repo url: $url in $MR_CONFIG"
+	mr -c "$MR_CONFIG" config "`pwd`" checkout="hg clone '$url' '$MR_REPO'"
+darcs_register = 
+	url=`cat _darcs/prefs/defaultrepo`
+	echo "Registering darcs repository $url in $MR_CONFIG"
+	mr -c "$MR_CONFIG" config "`pwd`" checkout="darcs get '$url'p '$MR_REPO'"
+git_bare_register = 
+	url="`LC_ALL=C GIT_CONFIG=config git config --get remote.origin.url`" || true
+	if [ -z "$url" ]; then
+		error "cannot determine git url"
 	fi
-log =							\
-	if [ -d "$MR_REPO"/.svn ]; then			\
-		svn log"$@"				\
-	elif [ -d "$MR_REPO"/.git ]; then		\
-		git log "$@"				\
-	elif [ -d "$MR_REPO"/.bzr ]; then		\
-		bzr log "$@"				\
-	elif [ -d "$MR_REPO"/CVS ]; then		\
-		cvs log "$@"				\
-	else						\
-		error "unknown repo type"		\
+	echo "Registering git url: $url in $MR_CONFIG"
+	mr -c "$MR_CONFIG" config "`pwd`" checkout="git clone --bare '$url' '$MR_REPO'"
+
+help =
+	if [ ! -e "$MR_PATH" ]; then
+		error "cannot find program path"
 	fi
+	(pod2man -c mr "$MR_PATH" | man -l -) || error "pod2man or man failed"
 list = true
-
-help =							\
-	if [ ! -e "$MR_PATH" ]; then			\
-		error "cannot find program path"	\
-	fi						\
-	(pod2man -c mr "$MR_PATH" | man -l -) ||	\
-		error "pod2man or man failed"
+config = 
 
 ed = echo "A horse is a horse, of course, of course.."
 T = echo "I pity the fool."
+right = echo "Not found."
+#}}}
+
+# vim:sw=8:sts=0:ts=8:noet