[PATCH v8 4/6] contrib: related: add option to parse from committish

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

For example master..feature-a.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
---
 contrib/related/git-related | 38 ++++++++++++++++++++++++++++++++++++--
 1 file changed, 36 insertions(+), 2 deletions(-)

diff --git a/contrib/related/git-related b/contrib/related/git-related
index 0de1c6c..3573237 100755
--- a/contrib/related/git-related
+++ b/contrib/related/git-related
@@ -7,10 +7,12 @@ require 'optparse'
 
 $since = '5-years-ago'
 $min_percent = 10
+$files = []
+$rev_args = []
 
 OptionParser.new do |opts|
   opts.program_name = 'git related'
-  opts.banner = 'usage: git related [options] <files>'
+  opts.banner = 'usage: git related [options] <files | rev-list options>'
 
   opts.on('-p', '--min-percent N', Integer,
           'Minium percentage of role participation') do |v|
@@ -118,10 +120,42 @@ class Commits
     end
   end
 
+  def from_rev_args(args)
+    source = nil
+    File.popen(%w[git rev-list --reverse] + args) do |p|
+      p.each do |e|
+        id = e.chomp
+        @main_commits[id] = true
+        File.popen(%w[git show -C --oneline] + [id]) do |p|
+          p.each do |e|
+            case e
+            when /^---\s+(\S+)/
+              source = $1 != '/dev/null' ? $1[2..-1] : nil
+            when /^@@ -(\d+)(?:,(\d+))?/
+              get_blame(source, $1, $2, id) if source
+            end
+          end
+        end
+      end
+    end
+  end
+
+end
+
+ARGV.each do |e|
+  if File.exists?(e)
+    $files << e
+  else
+    $rev_args << e
+  end
 end
 
 commits = Commits.new
-commits.from_patches(ARGV)
+if $files.empty?
+  commits.from_rev_args($rev_args)
+else
+  commits.from_patches($files)
+end
 commits.import
 
 count_per_person = Hash.new(0)
-- 
1.8.3.358.g5a91d05