X-Git-Url: https://git.madduck.net/code/myrepos.git/blobdiff_plain/7effaee66fb19a9fca46c0dca427e0ea2d5b1d90..49aac415047b7c394a02580aeac5a589b6478cd9:/mr

diff --git a/mr b/mr
index 9a8f750..80ccc78 100755
--- a/mr
+++ b/mr
@@ -1,5 +1,7 @@
 #!/usr/bin/perl
 
+#man{{{
+
 =head1 NAME
 
 mr - a Multiple Repository management tool
@@ -12,18 +14,117 @@ B<mr> [options] update
 
 B<mr> [options] status
 
-B<mr> [options] commit -m "message"
+B<mr> [options] commit [-m "message"]
+
+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 all of the repositories at once.
+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, and bzr repositories, 
+and support for other revision control systems can easily be added.
+
+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,
+
+These predefined commands should be fairly familiar to users of any revision
+control system:
+
+=over 4
+
+=item checkout (or co)
+
+Checks out any repositories that are not already checked out.
+
+=item update
+
+Updates each repository from its configured remote repository.
+
+If a repository isn't checked out yet, it will first check it out.
+
+=item status
+
+Displays a status report for each repository, showing what
+uncommitted changes are present in the repository.
+
+=item commit (or ci)
+
+Commits changes to each repository. (By default, changes are pushed to the
+remote repository too, when using distributed systems like git.)
+
+The optional -m parameter allows specifying a commit message.
+
+=item diff
+
+Show a diff of uncommitted changes.
+
+=item log
+
+Show the commit log.
+
+=back
+
+These commands are also available:
+
+=over 4
 
-Any mix of revision control systems can be used with B<mr>, and you can
-define arbitrary actions like "update", "checkout", or "commit".
+=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
+
+The ~/.mrconfig file is used by default. To use a different config file,
+use the -c option.
+
+=item help
+
+Displays this help.
+
+=back
+
+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 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
 
@@ -32,56 +133,115 @@ define arbitrary actions like "update", "checkout", or "commit".
 =item -d directory
 
 Specifies the topmost directory that B<mr> should work in. The default is
-the current working directory. B<mr> will operate on all registered
-repositories at or under the directory.
+the current working directory.
 
 =item -c mrconfig
 
-Use the specified mrconfig file, instead of looking for on 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
+
+Just operate on the repository for the current directory, do not 
+recurse into deeper repositories.
+
 =back
 
 =head1 FILES
 
-B<mr> is configured by .mrconfig files. It searches for .mrconfig files in
-your home directory, and in the root directory of each repository specified
-in a .mrconfig file. So you could have a ~/.mrconfig that registers a
-repository ~/src, that itself contains a ~/src/.mrconfig file, that in turn
-registers several additional repositories.
+B<mr> is configured by .mrconfig files. It starts by reading the .mrconfig
+file in your home directory, and this can in turn chain load .mrconfig files
+from repositories.
+
+Here is an example .mrconfig file:
+
+  [src]
+  checkout = svn co svn://svn.example.com/src/trunk src
+  chain = true
+
+  [src/linux-2.6]
+  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.
-Sections specify where each repository is located, relative to the
-directory that contains the .mrconfig file.
+"#" 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.
+
+The "ALIAS" section allows adding aliases for actions. Each parameter
+is an alias, and its value is the action to use.
+
+All other sections add repositories. The section header specifies the
+directory where the repository is located. This is relative to the directory
+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. Note that these shell commands are run in a "set -e" shell
-environment, and B<mr> cds into the repository directory before running
-them, except for the "checkout" command, which is run in the parent of the
-repository directory, since the repository isn't checked out yet.
+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".
 
-There are two special parameters. If the "skip" parameter is set and
-its command returns nonzero, then B<mr> will skip acting on that repository.
+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 "default" section allows setting up default handlers for each action,
-and is overridden by the contents of other sections. mr contains default
-handlers for the "update", "status", and "commit" actions, so normally
-you only need to specify what to do for "checkout".
+The "MR_REPO" environment variable is set to the path to the top of the
+repository. 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.
 
-For example:
+A few parameters have special meanings:
 
-  [src]
-  checkout = svn co svn://svn.example.com/src/trunk src
+=over 4
 
-  [src/linux-2.6]
-  # only check this out on kodama
-  skip = test $(hostname) != kodama
-  checkout = git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
+=item skip
+
+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") -lt 12 ]
+
+=item chain
+
+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 deleted
+
+If the "deleted" parameter is set and its command returns true, then
+B<mr> will treat the repository as deleted. It won't ever actually delete
+the repository, but it will warn if it sees the repository's directory.
+This is useful when one mrconfig file is shared amoung multiple machines,
+to keep track of and remember to delete old repositories.
+
+=item lib
+
+The "lib" parameter can specify some shell code that will be run before each
+command, this can be a useful way to define shell functions for other commands
+to use.
+
+=back
 
 =head1 AUTHOR
 
@@ -93,97 +253,309 @@ http://kitenet.net/~joey/code/mr/
 
 =cut
 
+#}}}
+
 use warnings;
 use strict;
 use Getopt::Long;
 use Cwd qw(getcwd abs_path);
 
+$SIG{INT}=sub {
+	print STDERR "mr: interrupted\n";
+	exit 2;
+};
+
+$ENV{MR_CONFIG}="$ENV{HOME}/.mrconfig";
+my $config_overridden=0;
 my $directory=getcwd();
-my $config="$ENV{HOME}/.mrconfig";
 my $verbose=0;
+my $stats=0;
+my $no_recurse=0;
 my %config;
+my %configfiles;
+my %knownactions;
+my %alias;
 
 Getopt::Long::Configure("no_permute");
 my $result=GetOptions(
-	"d=s" => sub { $directory=abs_path($_[1]) },
-	"c=s" => \$config,
-	"v" => \$verbose,
+	"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,
 );
 if (! $result || @ARGV < 1) {
-	die("Usage: mr [-d directory] action [params ...]\n");
+	die("Usage: mr [-d directory] action [params ...]\n".
+	    "(Use mr help for man page.)\n");
+
+}
+
+# Make sure MR_CONFIG is an absolute path, but don't use abs_path since
+# the config file might be a symlink to elsewhere, and the directory it's
+# in is significant.
+if ($ENV{MR_CONFIG} !~ /^\//) {
+	$ENV{MR_CONFIG}=getcwd()."/".$ENV{MR_CONFIG};
 }
-my $action=shift @ARGV;
 
 loadconfig(\*DATA);
-loadconfig($config);
+loadconfig($ENV{MR_CONFIG});
 #use Data::Dumper;
 #print Dumper(\%config);
 
-my (@failures, @successes, @skipped);
-my $first=1;
+eval {
+	use FindBin qw($Bin $Script);
+	$ENV{MR_PATH}=$Bin."/".$Script;
+};
+
+# 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 \"$action\" (known actions: ".
+			join(", ", sort keys %knownactions).")\n";
+	}
+	else {
+		die "mr: ambiguous action \"$action\" (matches: ".
+			join(", ", @matches).")\n";
+	}
+}
+
+# commands that do not operate on all repos
+if ($action eq 'help') {
+	exec($config{''}{DEFAULT}{$action}) || die "exec: $!";
+}
+elsif ($action eq 'config') {
+	if (@ARGV < 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=$1;
+		}
+	}
+	my %changefields;
+	foreach (@ARGV) {
+		if (/^([^=]+)=(.*)$/) {
+			$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;
+				}
+			}
+			if (! $found) {
+				die "mr $action: $section $_ not set\n";
+			}
+		}
+	}
+	modifyconfig($ENV{MR_CONFIG}, $section, %changefields) if %changefields;
+	exit 0;
+}
+elsif ($action eq '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};
+				last;
+			}
+		}
+	}
+	my $command="set -e; ".$config{''}{DEFAULT}{lib}."\n".
+		"my_action(){ $config{''}{DEFAULT}{$action}\n }; my_action ".
+		join(" ", map { s/\//\/\//g; s/"/\"/g; '"'.$_.'"' } @ARGV);
+	print STDERR "mr $action: running >>$command<<\n" if $verbose;
+	exec($command) || die "exec: $!";
+}
+
+# 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 $dir=$topdir.$subdir;
-
-		if (defined $directory &&
-		    $dir !~ /^\Q$directory\E\//) {
-			print "mr $action: $dir skipped per -d parameter ($directory)\n" if $verbose;
-			push @skipped, $dir;
-			next;
+		next if $subdir eq 'DEFAULT';
+		my $dir=($subdir =~/^\//) ? $subdir : $topdir.$subdir;
+		my $d=$directory;
+		$dir.="/" unless $dir=~/\/$/;
+		$d.="/" unless $d=~/\/$/;
+		next if $no_recurse && $d ne $dir;
+		next if $dir ne $d && $dir !~ /^\Q$d\E/;
+		push @repos, [$dir, $topdir, $subdir];
+	}
+}
+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;
+			}
 		}
+	}
+	$nochdir=1;
+}
 
-		print "\n" unless $first;
-		$first=0;
+my (@failed, @ok, @skipped);
+foreach my $repo (@repos) {
+	action($action, @$repo);
+}
 
-		if (exists $config{$topdir}{$subdir}{skip}) {
-			my $ret=system($config{$topdir}{$subdir}{skip});
-			if ($ret >> 8 == 0) {
-				print "mr $action: $dir skipped per config file\n" if $verbose;
-				push @skipped, $dir;
-				next;
+sub action { #{{{
+	my ($action, $dir, $topdir, $subdir) = @_;
+
+	$ENV{MR_CONFIG}=$configfiles{$topdir};
+	my $lib=exists $config{$topdir}{$subdir}{lib} ?
+	               $config{$topdir}{$subdir}{lib}."\n" : "";
+
+	if (exists $config{$topdir}{$subdir}{deleted}) {
+		my $test="set -e;".$lib.$config{$topdir}{$subdir}{deleted};
+		print "mr $action: running deleted test >>$test<<\n" if $verbose;
+		my $ret=system($test);
+		if ($ret != 0) {
+			if (($? & 127) == 2) {
+				print STDERR "mr $action: interrupted\n";
+				exit 2;
+			}
+			elsif ($? & 127) {
+				print STDERR "mr $action: deleted test received signal ".($? & 127)."\n";
 			}
 		}
-
-		if ($action eq 'checkout') {
-			if (-e $dir) {
-				print "mr $action: $dir already exists, skipping checkout\n";
+		if ($ret >> 8 == 0) {
+			if (-d $dir) {
+				print STDERR "mr error: $dir should be deleted yet still exists\n\n";
+				push @failed, $dir;
+				return;
+			}
+			else {
+				print "mr $action: $dir skipped (as deleted) per config file\n" if $verbose;
 				push @skipped, $dir;
-				next;
+				return;
 			}
-			$dir=~s/^(.*)\/[^\/]+\/?$/$1/;
 		}
-		if (! chdir($dir)) {
-			print STDERR "mr $action: failed to chdir to $dir: $!\n";
+	}
+
+	if ($action eq 'checkout') {
+		if (-d $dir) {
+			print "mr $action: $dir already exists, skipping checkout\n" if $verbose;
 			push @skipped, $dir;
+			return;
 		}
-		elsif (! exists $config{$topdir}{$subdir}{$action}) {
-			print STDERR "mr $action: no defined $action command for $topdir$subdir, skipping\n";
+
+		$dir=~s/^(.*)\/[^\/]+\/?$/$1/;
+
+		if (! -d $dir) {
+			print "mr $action: creating parent directory $dir\n" if $verbose;
+			my $ret=system("mkdir", "-p", $dir);
+		}
+	}
+	elsif ($action eq '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.
+			"my_action(){ $config{$topdir}{$subdir}{skip}\n }; my_action '$action'";
+		print "mr $action: running skip test >>$test<<\n" if $verbose;
+		my $ret=system($test);
+		if ($ret != 0) {
+			if (($? & 127) == 2) {
+				print STDERR "mr $action: interrupted\n";
+				exit 2;
+			}
+			elsif ($? & 127) {
+				print STDERR "mr $action: skip test received signal ".($? & 127)."\n";
+				exit 1;
+			}
+		}
+		if ($ret >> 8 == 0) {
+			print "mr $action: $dir skipped per config file\n" if $verbose;
 			push @skipped, $dir;
+			return;
+		}
+	}
+	
+	if (! $nochdir && ! chdir($dir)) {
+		print STDERR "mr $action: failed to chdir to $dir: $!\n";
+		push @failed, $dir;
+	}
+	elsif (! exists $config{$topdir}{$subdir}{$action}) {
+		print STDERR "mr $action: no defined $action command for $topdir$subdir, skipping\n";
+		push @skipped, $dir;
+	}
+	else {
+		if (! $nochdir) {
+			print "mr $action: $topdir$subdir\n";
 		}
 		else {
-			print "mr $action: in $dir\n";
-			my $command="set -e; my_action(){ $config{$topdir}{$subdir}{$action} ; }; my_action @ARGV";
-			my $ret=system($command);
-			if ($ret != 0) {
-				print STDERR "mr $action: failed to run: $command\n" if $verbose;
-				push @failures, $topdir.$subdir;
-				if ($ret >> 8 != 0) {
-					print STDERR "mr $action: command failed\n";
-				}
-				elsif ($ret != 0) {
-					print STDERR "mr $action: command died ($ret)\n";
-				}
+			print "mr $action: $topdir$subdir (in subdir $directory)\n";
+		}
+		my $command="set -e; ".$lib.
+			"my_action(){ $config{$topdir}{$subdir}{$action}\n }; my_action ".
+			join(" ", map { s/\//\/\//g; s/"/\"/g; '"'.$_.'"' } @ARGV);
+		print STDERR "mr $action: running >>$command<<\n" if $verbose;
+		my $ret=system($command);
+		if ($ret != 0) {
+			if (($? & 127) == 2) {
+				print STDERR "mr $action: interrupted\n";
+				exit 2;
 			}
-			else {
-				push @successes, $dir;
+			elsif ($? & 127) {
+				print STDERR "mr $action: received signal ".($? & 127)."\n";
+			}
+			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";
 			}
 		}
+		else {
+			if ($action eq 'checkout' && ! -d $dir) {
+				print STDERR "mr $action: $dir missing after checkout\n";;
+				push @failed, $dir;
+				return;
+			}
+
+			push @ok, $dir;
+		}
+
+		print "\n";
 	}
-}
+} #}}}
 
-sub showstat {
+sub showstat { #{{{
 	my $count=shift;
 	my $singular=shift;
 	my $plural=shift;
@@ -191,16 +563,33 @@ sub showstat {
 		return "$count ".($count > 1 ? $plural : $singular);
 	}
 	return;
+} #}}}
+if (! @ok && ! @failed && ! @skipped) {
+	die "mr $action: no repositories found to work on\n";
 }
-print "\nmr $action: finished (".join("; ",
-	showstat($#successes+1, "success", "successes"),
-	showstat($#failures+1, "failure", "failures"),
+print "mr $action: finished (".join("; ",
+	showstat($#ok+1, "ok", "ok"),
+	showstat($#failed+1, "failed", "failed"),
 	showstat($#skipped+1, "skipped", "skipped"),
 ).")\n";
-exit @failures ? 1 : 0;
+if ($stats) {
+	if (@skipped) {
+		print "mr $action: (skipped: ".join(" ", @skipped).")\n";
+	}
+	if (@failed) {
+		print STDERR "mr $action: (failed: ".join(" ", @failed).")\n";
+	}
+}
+if (@failed) {
+	exit 1;
+}
+elsif (! @ok && @skipped) {
+	exit 1;
+}
+exit 0;
 
 my %loaded;
-sub loadconfig {
+sub loadconfig { #{{{
 	my $f=shift;
 
 	my @toload;
@@ -208,103 +597,351 @@ 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}} };
+			    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;
-			if (length $dir && $section ne "default" &&
-			    -e $dir.$section."/.mrconfig") {
-				push @toload, $dir.$section."/.mrconfig";
-		        }
 		}
-		elsif (/^\s*(\w+)\s*=\s*(.*)/) {
+		elsif (/^(\w+)\s*=\s*(.*)/) {
 			my $parameter=$1;
 			my $value=$2;
 
-			# continuation line
-			while ($value=~/(.*)\\$/) {
-				$value=$1.<$in>;
+			# continued value
+			while (@lines && $lines[0]=~/^\s(.+)/) {
+				shift(@lines);
+				$line++;
+				$value.="\n$1";
 				chomp $value;
 			}
 
 			if (! defined $section) {
 				die "$f line $.: parameter ($parameter) not in section\n";
 			}
-			if (! exists $config{$dir}{$section} &&
-			      exists $config{$dir}{default}) {
+			if ($section ne 'ALIAS' &&
+			    ! exists $config{$dir}{$section} &&
+			    exists $config{$dir}{DEFAULT}) {
 				# copy in defaults
-				$config{$dir}{$section}={ %{$config{$dir}{default}} };
+				$config{$dir}{$section}={ %{$config{$dir}{DEFAULT}} };
+			}
+			if ($section eq 'ALIAS') {
+				$alias{$parameter}=$value;
+			}
+			elsif ($parameter eq 'lib') {
+				$config{$dir}{$section}{lib}.=$value."\n";
+			}
+			else {
+				$config{$dir}{$section}{$parameter}=$value;
+				$knownactions{$parameter}=1;
+				if ($parameter eq 'chain' &&
+				    length $dir && $section ne "DEFAULT" &&
+				    -e $dir.$section."/.mrconfig") {
+					my $ret=system($value);
+					if ($ret != 0) {
+						if (($? & 127) == 2) {
+							print STDERR "mr $action: chain test interrupted\n";
+							exit 2;
+						}
+						elsif ($? & 127) {
+							print STDERR "mr $action: chain test received signal ".($? & 127)."\n";
+						}
+					}
+					else {
+						push @toload, $dir.$section."/.mrconfig";
+					}
+			        }
 			}
-			$config{$dir}{$section}{$parameter}=$value;
 		}
 		else {
-				die "$f line $.: parse error\n";
+			die "$f line $line: parse error\n";
 		}
 	}
-	close $in;
 
 	foreach (@toload) {
 		loadconfig($_);
 	}
-}
+} #}}}
 
-__DATA__
-# Some useful actions that mr knows about by default.
+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;	
+} #}}}
+
+# Finally, some useful actions that mr knows about by default.
 # These can be overridden in ~/.mrconfig.
-[default]
-update = \
-	if [ -d .svn ]; then \
-		svn update; \
-	elif [ -d .git ]; then \
-		git pull origin master; \
-	else \
-		echo "mr update: unknown RCS"; \
-		exit 1; \
+#DATA{{{
+__DATA__
+[ALIAS]
+co = checkout
+ci = commit
+ls = list
+
+[DEFAULT]
+lib =
+	error() {
+		echo "mr: $@" >&2
+		exit 1
+	}
+	hours_since() {
+		for dir in .git .svn .bzr CVS; do
+			if [ -e "$MR_REPO/$dir" ]; then
+				flagfile="$MR_REPO/$dir/.mr_last$1"
+				break
+			fi
+		done
+		if [ -z "$flagfile" ]; then
+			error "cannot determine flag filename"
+		fi
+		perl -wle 'print -f shift() ? int((-M _) * 24) : 9999' "$flagfile"
+		touch "$flagfile"
+	}
+
+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"
+	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"
+	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"
+	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"
+	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"
+	fi
+register =
+	if [ -n "$1" ]; then
+		cd "$1"
 	fi
-status = \
-	if [ -d .svn ]; then \
-		svn status; \
-	elif [ -d .git ]; then \
-		git status || true; \
-	else \
-		echo "mr status: unknown RCS"; \
-		exit 1; \
+	basedir="$(basename $(pwd))"
+	if [ -d .svn ]; then
+		url=$(LANG=C svn info . | grep -i ^URL: | cut -d ' ' -f 2)
+		if [ -z "$url" ]; then
+			error "cannot determine svn url"
+		fi
+		echo "Registering svn url: $url in $MR_CONFIG"
+		mr -c "$MR_CONFIG" config "$(pwd)" checkout="svn co $url $basedir"
+	elif [ -d .git ]; then
+		url=$(LANG=C git-config --get remote.origin.url)
+		if [ -z "$url" ]; then
+			error "cannot determine git url"
+		fi
+		echo "Registering git url: $url in $MR_CONFIG"
+		mr -c "$MR_CONFIG" config "$(pwd)" checkout="git clone $url $basedir"
+	elif [ -d .bzr ]; then
+		url=$(cat .bzr/branch/parent)
+		if [ -z "$url" ]; then
+			error "cannot determine bzr url"
+		fi
+		echo "Registering bzr url: $url in $MR_CONFIG"
+		mr -c "$MR_CONFIG" config "$(pwd)" checkout="bzr clone $url $basedir"
+	elif [ -d CVS ]; then
+		repo=$(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 $basedir $repo"
+	else
+		error "unable to register this repo type"
 	fi
-commit = \
-	if [ -d .svn ]; then \
-		svn commit "$@"; \
-	elif [ -d .git ]; then \
-		git commit -a "$@"; \
-	else \
-		echo "mr commit: unknown RCS"; \
-		exit 1; \
+help =
+	if [ ! -e "$MR_PATH" ]; then
+		error "cannot find program path"
 	fi
+	(pod2man -c mr "$MR_PATH" | man -l -) || error "pod2man or man failed"
+list = true
+config = 
+
+ed = echo "A horse is a horse, of course, of course.."
+T = echo "I pity the fool."
+right = echo "Not found."
+#}}}