1 files changed, 26 insertions, 0 deletions
diff --git a/tool/change_maker.rb b/tool/change_maker.rb
new file mode 100755
index 0000000000..d039de9909
--- /dev/null
+++ b/tool/change_maker.rb
@@ -0,0 +1,26 @@
+#! ./miniruby
+
+if File.directory?(".svn")
+  cmd = "svn diff"
+elsif File.directory?(".git")
+  cmd = "git diff"
+else
+  abort "does not seem to be under a vcs"
+end
+
+def diff2index(cmd, *argv)
+  path = nil
+  `#{cmd} #{argv.join(" ")}`.split(/\n/).each do |line|
+    case line
+    when /^Index: (\S*)/, /^diff --git [a-z]\/(\S*) [a-z]\/\1/
+      path = $1
+    when /^@@.*@@ +([A-Za-z_][A-Za-z_0-9 ]*[A-Za-z_0-9])/
+      puts "* #{path} (#{$1}):"
+    end
+  end
+  !!path
+end
+
+if !diff2index(cmd, ARGV) and /^git/ =~ cmd
+  diff2index(cmd, "--cached", ARGV)
+end