git-p4: Improve rename detection support

Only open files for edit after integrating if the SHA1 of source and destination
differ from each other.
Add git config option detectRenames to allow permanent rename detection. This
options should be set to a true/false value.
Rename "detectRename" variable to "detectRenames" to make it more coherent with
the description in git man pages, which always use plural.

Signed-off-by: Vitor Antunes <vitor.hda@gmail.com>
Acked-by: Pete Wyckoff <pw@padd.com>
Acked-by: Tor Arvid Lund <torarvid@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

contrib/fast-import/git-p4

@@ -543,13 +543,13 @@ class P4Submit(Command):
         self.options = [
                 optparse.make_option("--verbose", dest="verbose", action="store_true"),
                 optparse.make_option("--origin", dest="origin"),
-                optparse.make_option("-M", dest="detectRename", action="store_true"),
+                optparse.make_option("-M", dest="detectRenames", action="store_true"),
         ]
         self.description = "Submit changes from git to the perforce depot."
         self.usage += " [name of git branch to submit into perforce depot]"
         self.interactive = True
         self.origin = ""
-        self.detectRename = False
+        self.detectRenames = False
         self.verbose = False
         self.isWindows = (platform.system() == "Windows")
 
@@ -613,7 +613,16 @@ 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]
+
+        if not self.detectRenames:
+            # If not explicitly set check the config variable
+            self.detectRenames = gitConfig("git-p4.detectRenames").lower() == "true"
+
+        if self.detectRenames:
+            diffOpts = "-M"
+        else:
+            diffOpts = ""
+
         diff = read_pipe_lines("git diff-tree -r %s \"%s^\" \"%s\"" % (diffOpts, id, id))
         filesToAdd = set()
         filesToDelete = set()
@@ -640,8 +649,10 @@ 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']):
+                    p4_system("edit \"%s\"" % (dest))
                     filesToChangeExecBit[dest] = diff['dst_mode']
                 os.unlink(dest)
                 editedFiles.add(dest)