Refactor checking for (type of) Git repository

[code/myrepos.git] / mr

diff --git a/mr b/mr
index 72c917c66353024481761a1ca8dae5ed2668702f..c646a3bbbcc2b49c8f06e579285dc80648a2d7b1 100755 (executable)
--- a/mr
+++ b/mr
@@ -1,5 +1,7 @@
 #!/usr/bin/perl
 
 #!/usr/bin/perl
 

+#man{{{
+

 =head1 NAME
 
 mr - a Multiple Repository management tool
 =head1 NAME
 
 mr - a Multiple Repository management tool


@@ -14,50 +16,119 @@ 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> [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, mecurial,
+bzr and darcs repositories, and support for other revision control systems can
+easily be added.

 
 

-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> 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
 
 control system:
 
 =over 4
 

-=item checkout
+=item checkout (or co)

 
 

-Checks out all the registered repositories that are not already checked
-out.
+Checks out any repositories that are not already checked out.

 
 =item update
 
 
 =item update
 

-Updates each registered repository from its configured remote repository.
+Updates each repository from its configured remote repository.

 
 If a repository isn't checked out yet, it will first check it out.
 
 =item status
 
 
 If a repository isn't checked out yet, it will first check it out.
 
 =item status
 

-Displays a status report for each registered repository, showing what
+Displays a status report for each repository, showing what

 uncommitted changes are present in the repository.
 
 uncommitted changes are present in the repository.
 

-=item commit
+=item commit (or ci)

 
 

-Commits changes to each registered repository. (By default, changes
-are pushed to the remote repository too, when using distributed systems
-like git.)
+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.
 
 
 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
+
+=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.
+

 =back
 
 Actions can be abbreviated to any unambiguous subsctring, so
 =back
 
 Actions can be abbreviated to any unambiguous subsctring, so

-"mr st" is equivilant to "mr status".
+"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
 
 
 =head1 OPTIONS
 


@@ -66,57 +137,123 @@ Actions can be abbreviated to any unambiguous subsctring, so
 =item -d directory
 
 Specifies the topmost directory that B<mr> should work in. The default is
 =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
 
 
 =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 -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.
+
+=item -j number
+
+Run the specified number of jobs in parallel. This can greatly speed up
+operations such as updates. It is not recommended for interactive
+operations.
+

 =back
 
 =head1 FILES
 
 =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
 
 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
 
 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
+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
 environment, where any additional parameters you pass are available in

-"$@". B<mr> cds into the repository directory before running
-a command, except for the "checkout" command, which is run in the parent
-of the repository directory, since the repository isn't checked out yet.
+"$@". 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.

 
 

-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.
+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.

 
 

-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".
+A few parameters have special meanings:

 
 

-For example:
+=over 4

 
 

-  [src]
-  checkout = svn co svn://svn.example.com/src/trunk src
+=item skip

 
 

-  [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
+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 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 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
 
 
 =head1 AUTHOR
 


@@ -128,123 +265,433 @@ http://kitenet.net/~joey/code/mr/
 
 =cut
 
 
 =cut
 

+#}}}
+

 use warnings;
 use strict;
 use Getopt::Long;
 use Cwd qw(getcwd abs_path);
 use warnings;
 use strict;
 use Getopt::Long;
 use Cwd qw(getcwd abs_path);

-
-my $directory=getcwd();
-my $config="$ENV{HOME}/.mrconfig";
+use POSIX "WNOHANG";
+use constant {
+       OK => 0,
+       FAILED => 1,
+       SKIPPED => 2,
+       ABORT => 3,
+};
+
+$SIG{INT}=sub {
+       print STDERR "mr: interrupted\n";
+       exit 2;
+};
+
+$ENV{MR_CONFIG}="$ENV{HOME}/.mrconfig";
+my $config_overridden=0;

 my $verbose=0;
 my $verbose=0;

+my $stats=0;
+my $no_recurse=0;
+my $jobs=1;

 my %config;
 my %config;

+my %configfiles;

 my %knownactions;
 my %knownactions;

+my %alias;
+my $directory=getcwd();

 
 Getopt::Long::Configure("no_permute");
 my $result=GetOptions(
 
 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,
+       "j|jobs=i" => \$jobs,

 );
 if (! $result || @ARGV < 1) {
 );
 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");
+
+}
+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;
+};
+

 loadconfig(\*DATA);
 loadconfig(\*DATA);

-loadconfig($config);
+loadconfig($ENV{MR_CONFIG});

 #use Data::Dumper;
 #print Dumper(\%config);
 
 #use Data::Dumper;
 #print Dumper(\%config);
 

+# alias expansion and command stemming

 my $action=shift @ARGV;
 my $action=shift @ARGV;

-if (! $knownactions{$action}) {
-       my @matches = grep { /^\Q$action\E/ } keys %knownactions;
+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];
        }
        if (@matches == 1) {
                $action=$matches[0];
        }

+       elsif (@matches == 0) {
+               die "mr: unknown action \"$action\" (known actions: ".
+                       join(", ", sort keys %knownactions).")\n";
+       }

        else {
        else {

-               die "mr: ambiguous action \"$action\" (matches @matches)\n";
+               die "mr: ambiguous action \"$action\" (matches: ".
+                       join(", ", @matches).")\n";

        }
 }
 
        }
 }
 

-my (@failed, @successful, @skipped);
-my $first=1;
-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 ne $directory &&
-                   $dir !~ /^\Q$directory\E\//) {
-                       print "mr $action: $dir skipped per -d parameter ($directory)\n" if $verbose;
-                       push @skipped, $dir;
-                       next;
+# commands that do not operate on all repos
+if ($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;

                }
                }

-
-               print "\n" unless $first;
-               $first=0;
-
-               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, $dir;
-                               next;
+       }
+       my %changefields;
+       foreach (@ARGV) {
+               if (/^([^=]+)=(.*)$/) {
+                       $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;
+                                       last if $section eq 'DEFAULT';
+                               }
+                       }
+                       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: $!";
+}

 
 

-               action($action, $dir, $topdir, $subdir);
+# an ordered list of repos
+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},
+               };
+       }
+}
+@list = sort {
+               $a->{order}  <=> $b->{order}
+                            ||
+               $a->{topdir} cmp $b->{topdir}
+                            ||
+               $a->{subdir} cmp $b->{subdir}
+       } @list;
+
+# work out what repos to act on
+my @repos;
+my $nochdir=0;
+foreach my $repo (@list) {
+       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 $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
+       foreach my $repo (reverse @list) {
+               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;
+               }
+       }
+       $nochdir=1;
+}

 
 

+# run the action on each repository and print stats
+my (@ok, @failed, @skipped);
+if ($jobs > 1) {
+       mrs(@repos);
+}
+else {
+       foreach my $repo (@repos) {
+               record($repo, action($action, @$repo));
+       }
+}
+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";

        }
 }
        }
 }

+if (@failed) {
+       exit 1;
+}
+elsif (! @ok && @skipped) {
+       exit 1;
+}
+exit 0;

 
 

-sub action {
+sub action { #{{{

        my ($action, $dir, $topdir, $subdir) = @_;
 
        my ($action, $dir, $topdir, $subdir) = @_;
 

+       $ENV{MR_CONFIG}=$configfiles{$topdir};
+       my $lib=exists $config{$topdir}{$subdir}{lib} ?
+                      $config{$topdir}{$subdir}{lib}."\n" : "";
+

        if ($action eq 'checkout') {
                if (-d $dir) {
        if ($action eq 'checkout') {
                if (-d $dir) {

-                       print "mr $action: $dir already exists, skipping checkout\n";
-                       push @skipped, $dir;
-                       next;
+                       print "mr $action: $dir already exists, skipping checkout\n" if $verbose;
+                       return SKIPPED;

                }
                }

+

                $dir=~s/^(.*)\/[^\/]+\/?$/$1/;
                $dir=~s/^(.*)\/[^\/]+\/?$/$1/;

+
+               if (! -d $dir) {
+                       print "mr $action: creating parent directory $dir\n" if $verbose;
+                       system("mkdir", "-p", $dir);
+               }

        }
        }

-       if ($action eq 'update') {
+       elsif ($action =~ /update/) {

                if (! -d $dir) {
                        return action("checkout", $dir, $topdir, $subdir);
                }
        }
                if (! -d $dir) {
                        return action("checkout", $dir, $topdir, $subdir);
                }
        }

-
-       if (! chdir($dir)) {
+       
+       $ENV{MR_REPO}=$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 $action: interrupted\n";
+                               return ABORT;
+                       }
+                       elsif ($? & 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;
+                       return SKIPPED;
+               }
+       }
+       
+       if (! $nochdir && ! chdir($dir)) {

                print STDERR "mr $action: failed to chdir to $dir: $!\n";
                print STDERR "mr $action: failed to chdir to $dir: $!\n";

-               push @skipped, $dir;
+               return FAILED;

        }
        elsif (! exists $config{$topdir}{$subdir}{$action}) {
                print STDERR "mr $action: no defined $action command for $topdir$subdir, skipping\n";
        }
        elsif (! exists $config{$topdir}{$subdir}{$action}) {
                print STDERR "mr $action: no defined $action command for $topdir$subdir, skipping\n";

-               push @skipped, $dir;
+               return SKIPPED;

        }
        else {
        }
        else {

-               print "mr $action: in $dir\n";
-               my $command="set -e; my_action(){ $config{$topdir}{$subdir}{$action} ; }; my_action ".
+               if (! $nochdir) {
+                       print "mr $action: $topdir$subdir\n";
+               }
+               else {
+                       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 ".

                        join(" ", map { s/\//\/\//g; s/"/\"/g; '"'.$_.'"' } @ARGV);
                        join(" ", map { s/\//\/\//g; s/"/\"/g; '"'.$_.'"' } @ARGV);

+               print STDERR "mr $action: running >>$command<<\n" if $verbose;

                my $ret=system($command);
                if ($ret != 0) {
                my $ret=system($command);
                if ($ret != 0) {

-                       print STDERR "mr $action: failed to run: $command\n" if $verbose;
-                       push @failed, $topdir.$subdir;
+                       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;

                        if ($ret >> 8 != 0) {
                                print STDERR "mr $action: command failed\n";
                        }
                        elsif ($ret != 0) {
                                print STDERR "mr $action: command died ($ret)\n";
                        }
                        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 {
                }
                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 { #{{{
+       $| = 1;
+       my @active;
+       my @fhs;
+       my @out;
+       my $running=0;
+       while (@fhs or @repos) {
+               while ($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 showstat { #{{{

        my $count=shift;
        my $singular=shift;
        my $plural=shift;
        my $count=shift;
        my $singular=shift;
        my $plural=shift;


@@ -252,16 +699,10 @@ sub showstat {
                return "$count ".($count > 1 ? $plural : $singular);
        }
        return;
                return "$count ".($count > 1 ? $plural : $singular);
        }
        return;

-}
-print "\nmr $action: finished (".join("; ",
-       showstat($#successful+1, "successful", "successful"),
-       showstat($#failed+1, "failed", "failed"),
-       showstat($#skipped+1, "skipped", "skipped"),
-).")\n";
-exit @failed ? 1 : 0;
+} #}}}

 
 my %loaded;
 
 my %loaded;

-sub loadconfig {
+sub loadconfig { #{{{

        my $f=shift;
 
        my @toload;
        my $f=shift;
 
        my @toload;


@@ -269,107 +710,450 @@ sub loadconfig {
        my $in;
        my $dir;
        if (ref $f eq 'GLOB') {
        my $in;
        my $dir;
        if (ref $f eq 'GLOB') {

-               $in=$f; 

                $dir="";
                $dir="";

+               $in=$f; 

        }
        else {
        }
        else {

-               # $f might be a symlink
+               if (! -e $f) {
+                       return;
+               }
+

                my $absf=abs_path($f);
                if ($loaded{$absf}) {
                        return;
                }
                $loaded{$absf}=1;
 
                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)."/";
                ($dir)=$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;
 
                # 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} &&
                        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;
                        }
                }
                                last;
                        }
                }

+               
+               print "mr: loading config $f\n" if $verbose;
+               open($in, "<", $f) || die "mr: open $f: $!\n";

        }
        }

+       my @lines=<$in>;
+       close $in;

 
        my $section;
 
        my $section;

-       while (<$in>) {
+       my $line=0;
+       while (@lines) {
+               $_=shift @lines;
+               $line++;

                chomp;
                next if /^\s*\#/ || /^\s*$/;
                chomp;
                next if /^\s*\#/ || /^\s*$/;

-               if (/^\s*\[([^\]]*)\]\s*$/) {
+               if (/^\[([^\]]*)\]\s*$/) {

                        $section=$1;
                        $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;
 
                        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";
                        }
                                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
                                # 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;
-                       $knownactions{$parameter}=1;

                }
                else {
                }
                else {

-                               die "$f line $.: parse error\n";
+                       die "$f line $line: parse error\n";

                }
        }
                }
        }

-       close $in;

 
        foreach (@toload) {
                loadconfig($_);
        }
 
        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.
 # 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 repo type"; \
-               exit 1; \
+#DATA{{{
+__DATA__
+[ALIAS]
+co = checkout
+ci = commit
+ls = list
+
+[DEFAULT]
+order = 10
+lib =
+       error() {
+               echo "mr: $@" >&2
+               exit 1
+       }
+       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
+       }
+       get_git_repo_type()
+       {
+               if [ -d "$1"/.git ] && [ -d "$1"/.git/refs/heads ] &&
+                       [ -d "$1"/.git/objects ] && [ -f "$1"/.git/config ];
+                       then
+                       echo non-bare
+               elif [ -d "$1"/refs/heads ] && [ -d "$1"/refs/tags ] &&
+                       [ -d "$1"/objects ] && [ -f "$1"/config ]; then
+                       local bare
+                       bare="$(GIT_CONFIG="$1"/config git-config --get core.bare)"
+                       case "$bare" in
+                               true) echo bare;;
+                               false) echo fake-bare;;
+                               *) return 255;;
+                       esac
+               else
+                       return 1
+               fi
+       }
+       is_git_repo() {
+               get_git_repo_type "$1" >/dev/null
+       }
+
+update =
+       if [ -d "$MR_REPO"/.svn ]; then
+               svn update "$@"
+       elif is_git_repo "$MR_REPO"; then
+               # all this is because of a bug in git-fetch, which requires GIT_DIR set
+               local git_dir_override; git_dir_override=.git
+               case "$(get_git_repo_type "$MR_REPO")" in
+                       fake-bare) git_dir_override="$MR_REPO";;
+               esac
+               args="$@"
+               [ -z "$args" ] && args="-t origin master"
+               eval GIT_DIR="$git_dir_override" git pull "$args"
+       elif [ -d "$MR_REPO"/.bzr ]; then
+               bzr merge "$@"
+       elif [ -d "$MR_REPO"/CVS ]; then
+               cvs update "$@"
+       elif [ -d "$MR_REPO"/.hg ]; then
+               hg pull "$@" && hg update "$@"
+       elif [ -d "$MR_REPO"/_darcs ]; then
+               darcs pull -a "$@"
+       else
+               error "unknown repo type"
+       fi
+status =
+       if [ -d "$MR_REPO"/.svn ]; then
+               svn status "$@"
+       elif is_git_repo "$MR_REPO"; then
+               git status "$@" || true
+       elif [ -d "$MR_REPO"/.bzr ]; then
+               bzr status "$@"
+       elif [ -d "$MR_REPO"/CVS ]; then
+               cvs status "$@"
+       elif [ -d "$MR_REPO"/.hg ]; then
+               hg status "$@"
+       elif [ -d "$MR_REPO"/_darcs ]; then
+               darcs whatsnew -ls "$@"
+       else
+               error "unknown repo type"

        fi
        fi

-status = \
-       if [ -d .svn ]; then \
-               svn status; \
-       elif [ -d .git ]; then \
-               git status || true; \
-       else \
-               echo "mr status: unknown repo type"; \
-               exit 1; \
+commit =
+       if [ -d "$MR_REPO"/.svn ]; then
+               svn commit "$@"
+       elif is_git_repo "$MR_REPO"; then
+               case "$(get_git_repo_type "$MR_REPO")" in
+                       bare) error "cannot commit to bare git repositories";;
+                       fake-bare) error "commit does not work for fake bare git repositories (yet).";;
+               esac
+               git commit -a "$@" && git push --all
+       elif [ -d "$MR_REPO"/.bzr ]; then
+               bzr commit "$@" && bzr push
+       elif [ -d "$MR_REPO"/CVS ]; then
+               cvs commit "$@"
+       elif [ -d "$MR_REPO"/.hg ]; then
+               hg commit -m "$@" && hg push
+       elif [ -d "$MR_REPO"/_darcs ]; then
+               darcs commit -a -m "$@" && darcs push -a
+       else
+               error "unknown repo type"

        fi
        fi

-commit = \
-       if [ -d .svn ]; then \
-               svn commit "$@"; \
-       elif [ -d .git ]; then \
-               git commit -a "$@" \
-       else \
-               echo "mr commit: unknown repo type"; \
-               exit 1; \
+diff =
+       if [ -d "$MR_REPO"/.svn ]; then
+               svn diff "$@"
+       elif is_git_repo "$MR_REPO"; then
+               case "$(get_git_repo_type "$MR_REPO")" in
+                       bare) error "cannot diff in bare git repositories";;
+                       fake-bare) error "diff does not work for fake bare git repositories (yet).";;
+               esac
+               git diff "$@"
+       elif [ -d "$MR_REPO"/.bzr ]; then
+               bzr diff "$@"
+       elif [ -d "$MR_REPO"/CVS ]; then
+               cvs diff "$@"
+       elif [ -d "$MR_REPO"/.hg ]; then
+               hg diff "$@"
+       elif [ -d "$MR_REPO"/_darcs ]; then
+               darcs diff "$@"
+       else
+               error "unknown repo type"

        fi
        fi

+log =
+       if [ -d "$MR_REPO"/.svn ]; then
+               svn log"$@"
+       elif is_git_repo "$MR_REPO"; then
+               git log "$@"
+       elif [ -d "$MR_REPO"/.bzr ]; then
+               bzr log "$@"
+       elif [ -d "$MR_REPO"/CVS ]; then
+               cvs log "$@"
+       elif [ -d "$MR_REPO"/.hg ]; then
+               hg log "$@"
+       elif [ -d "$MR_REPO"/_darcs ]; then
+               darcs changes "$@"
+       else
+               error "unknown repo type"
+       fi
+register =
+       if [ -n "$1" ]; then
+               cd "$1"
+       fi
+       basedir="$(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 $basedir"
+       elif is_git_repo .; then
+               local repo_type; repo_type="$(get_git_repo_type .)"
+               local config;
+               case "$repo_type" in
+                       non-bare) config=.git/config;;
+                       bare|fake-bare) config=config;;
+                       *) error "unknown git repository type: $repo_type"
+               esac
+               url="$(LANG=C GIT_CONFIG="$config" git-config --get remote.origin.url)"
+               if [ -z "$url" ]; then
+                       error "cannot determine git url"
+               fi
+               case "$repo_type" in
+                       bare|fake-bare)
+                               # this seems like a bare repo as it has no
+                               # worktree.
+                               local work_tree
+                               work_tree="$(git-config --get core.worktree)" || :
+                               if [ ! -d "$work_tree" ]; then
+                                       error "git worktree $work_tree does not exist"
+                               fi
+                               suffix=" (with worktree $work_tree)"
+                               mr -c "$MR_CONFIG" config "$(pwd)" \
+                                       lib="GIT_WORK_TREE=$work_tree; export GIT_WORK_TREE"
+                               ;;
+               esac
+               echo "Registering git url: $url in $MR_CONFIG${suffix:-}"
+               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 $repo"
+       elif [ -d .hg ]; then
+               url=$(hg showconfig paths.default)
+               echo "Registering mercurial repo url: $url in $MR_CONFIG"
+               mr -c "$MR_CONFIG" config "$(pwd)" \
+                       checkout="hg clone $url $basedir"
+       elif [ -d _darcs ]; then
+               url=$(cat _darcs/prefs/defaultrepo)
+               echo "Registering darcs repository $url in $MR_CONFIG"
+               mr -c "$MR_CONFIG" config "$(pwd)" \
+                       checkout="darcs get $url $basedir"
+       else
+               error "unable to register this repo type"
+       fi
+help =
+       if [ ! -e "$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."
+#}}}
+
+# vim:sw=8:sts=0:ts=8:noet