From 1d52e66eec5f8a0680073613e9284911d34996f3 Mon Sep 17 00:00:00 2001
From: Colin Newell <colin.newell@gmail.com>
Date: Fri, 15 Apr 2016 16:06:03 +0100
Subject: [PATCH 1/2] Added -l option for simply listing the interesting repo's

---
 lib/App/Multigit.pm      |  1 +
 lib/App/Multigit/Repo.pm |  2 ++
 script/mg                | 12 ++++++++++++
 3 files changed, 15 insertions(+)

diff --git a/lib/App/Multigit.pm b/lib/App/Multigit.pm
index d22a916..a33b79e 100644
--- a/lib/App/Multigit.pm
+++ b/lib/App/Multigit.pm
@@ -83,6 +83,7 @@ our %BEHAVIOUR = (
     report_on_no_output => $ENV{MG_REPORT_ON_NO_OUTPUT} // 1,
     ignore_stdout       => !!$ENV{MG_IGNORE_STDOUT},
     ignore_stderr       => !!$ENV{MG_IGNORE_STDERR},
+    list_repos          => $ENV{MG_LIST_REPOS},
     concurrent          => $ENV{MG_CONCURRENT_PROCESSES} // 20,
     skip_readonly       => !!$ENV{MG_SKIP_READONLY},
 );
diff --git a/lib/App/Multigit/Repo.pm b/lib/App/Multigit/Repo.pm
index 1c793c9..2d0c191 100644
--- a/lib/App/Multigit/Repo.pm
+++ b/lib/App/Multigit/Repo.pm
@@ -252,6 +252,8 @@ sub report {
     return Future->done unless $App::Multigit::BEHAVIOUR{report_on_no_output} 
         or $output =~ s/\s//gr;
 
+    $output = '' if $App::Multigit::BEHAVIOUR{list_repos};
+
     return Future->done(
         $dir => $output
     );
diff --git a/script/mg b/script/mg
index 174d5a9..33c2031 100755
--- a/script/mg
+++ b/script/mg
@@ -25,6 +25,7 @@ sub usage;
         'verbose|v' => sub {
             $qs--;
         },
+        'list|l' => \$ENV{MG_LIST_REPOS},
         'concurrent|c=i' => \$ENV{MG_CONCURRENT_PROCESSES},
         'skip-readonly' => \$ENV{MG_SKIP_READONLY},
     );
@@ -108,4 +109,15 @@ might use this.
 Skip readonly repositories.  Repositories marked readonly = 1 in the .mgconfig
 will be ignored by whatever command you run.
 
+=item -l
+
+=item --list
+
+List repositories that would produce output.  This is useful for piping the list
+of repositories to another mg each.
+
+For example,
+
+    mg -l st -uno | mg each git push
+
 =back

From acd7647c9b536444baf09054564748e5cfe20282 Mon Sep 17 00:00:00 2001
From: Colin Newell <colin.newell@gmail.com>
Date: Fri, 15 Apr 2016 16:09:14 +0100
Subject: [PATCH 2/2] Added note about mg grep

---
 script/mg | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/script/mg b/script/mg
index 33c2031..7ea29fc 100755
--- a/script/mg
+++ b/script/mg
@@ -120,4 +120,12 @@ For example,
 
     mg -l st -uno | mg each git push
 
+Note that mg grep does a very similar thing and may be more appropriate.
+
+    mg grep git not-master
+
+Is roughly equivalent to,
+
+    mg -lq each git not-master
+
 =back