[PATCH v10 05/15] contrib: related: parse committish like format-patch

[Felipe Contreras <felipe.contreras@gmail.com>]

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
---
 contrib/related/git-related    | 15 +++++++++++++++
 contrib/related/test-related.t | 10 ++++++++++
 2 files changed, 25 insertions(+)

diff --git a/contrib/related/git-related b/contrib/related/git-related
index 4f78304..80e1f17 100755
--- a/contrib/related/git-related
+++ b/contrib/related/git-related
@@ -108,6 +108,21 @@ class Commits
   end
 
   def from_rev_args(args)
+    revs = []
+
+    File.popen(%w[git rev-parse --revs-only --default HEAD --symbolic] + args).each do |rev|
+      revs << rev.chomp
+    end
+
+    case revs.size
+    when 1
+      r = revs[0]
+      r = '^' + r if r[0] != '-'
+      args = [ r, 'HEAD' ]
+    else
+      args = revs
+    end
+
     File.popen(%w[git rev-list --reverse] + args) do |p|
       p.each do |e|
         id = e.chomp
diff --git a/contrib/related/test-related.t b/contrib/related/test-related.t
index b623d69..39b4fe9 100755
--- a/contrib/related/test-related.t
+++ b/contrib/related/test-related.t
@@ -74,4 +74,14 @@ test_expect_success "from committish" "
 	test_cmp expected actual
 "
 
+test_expect_success "from single rev committish" "
+	git related -1 master | sort > actual &&
+	cat > expected <<-EOF &&
+	John Doe <john@doe.com>
+	John Poppins <john@doe.com>
+	Jon Stewart <jon@stewart.com>
+	EOF
+	test_cmp expected actual
+"
+
 test_done
-- 
1.8.4-fc