[PATCH v8 5/6] contrib: related: parse committish like format-patch

[Felipe Contreras <felipe.contreras@xxxxxxxxx>]

Signed-off-by: Felipe Contreras <felipe.contreras@xxxxxxxxx>
---
 contrib/related/git-related | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/contrib/related/git-related b/contrib/related/git-related
index 3573237..585572b 100755
--- a/contrib/related/git-related
+++ b/contrib/related/git-related
@@ -121,6 +121,21 @@ 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
+
     source = nil
     File.popen(%w[git rev-list --reverse] + args) do |p|
       p.each do |e|
-- 
1.8.3.358.g5a91d05

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