[PATCH 1/2] git-p4: Don't edit renamed files if not necessary.

[Vitor Antunes <vitor.hda@gmail.com>]

Only open files for edit after integrating if the SHA1 of source and
destination differ from each other.
Also added git config option to allow permanent rename detection.
The detectRenames option should be set to the desired threshold value.
Rename detection can still be enabled through -M option.
---
 contrib/fast-import/git-p4 |   11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/contrib/fast-import/git-p4 b/contrib/fast-import/git-p4
index 04ce7e3..ba18512 100755
--- a/contrib/fast-import/git-p4
+++ b/contrib/fast-import/git-p4
@@ -613,7 +613,13 @@ class P4Submit(Command):
 
     def applyCommit(self, id):
         print "Applying %s" % (read_pipe("git log --max-count=1 --pretty=oneline %s" % id))
-        diffOpts = ("", "-M")[self.detectRename]
+
+        detectRenames = gitConfig("git-p4.detectRenames")
+        if len(detectRenames) > 0:
+            diffOpts = "-M%s" % detectRenames
+        else:
+            diffOpts = ("", "-M")[self.detectRenames]
+
         diff = read_pipe_lines("git diff-tree -r %s \"%s^\" \"%s\"" % (diffOpts, id, id))
         filesToAdd = set()
         filesToDelete = set()
@@ -640,7 +646,8 @@ class P4Submit(Command):
             elif modifier == "R":
                 src, dest = diff['src'], diff['dst']
                 p4_system("integrate -Dt \"%s\" \"%s\"" % (src, dest))
-                p4_system("edit \"%s\"" % (dest))
+                if diff['src_sha1'] != diff['dst_sha1']:
+                    p4_system("edit \"%s\"" % (dest))
                 if isModeExecChanged(diff['src_mode'], diff['dst_mode']):
                     filesToChangeExecBit[dest] = diff['dst_mode']
                 os.unlink(dest)
-- 
1.7.2.3