Make it possible to run git-p4 submit from within the git repository

Signed-off-by: Simon Hausmann <hausmann@kde.org>

contrib/fast-import/git-p4

@@ -162,7 +162,7 @@ class P4Sync(Command):
         self.dryRun = False
         self.substFile = ""
         self.firstTime = True
-        self.origin = "origin"
+        self.origin = ""
         self.master = ""
         self.applyAsPatch = True
 
@@ -304,6 +304,42 @@ class P4Sync(Command):
             print "Perforce submit template written as %s. Please review/edit and then use p4 submit -i < %s to submit directly!" % (fileName, fileName)
 
     def run(self, args):
+        global gitdir
+        # make gitdir absolute so we can cd out into the perforce checkout
+        gitdir = os.path.abspath(gitdir)
+        os.environ["GIT_DIR"] = gitdir
+        depotPath = ""
+        if gitBranchExists("p4"):
+            [depotPath, dummy] = extractDepotPathAndChangeFromGitLog(extractLogMessageFromGitCommit("p4"))
+        if len(depotPath) == 0 and gitBranchExists("origin"):
+            [depotPath, dummy] = extractDepotPathAndChangeFromGitLog(extractLogMessageFromGitCommit("origin"))
+
+        if len(depotPath) == 0:
+            print "Internal error: cannot locate perforce depot path from existing branches"
+            sys.exit(128)
+
+        if not depotPath.endswith("/"):
+            depotPath += "/"
+        clientPath = p4Cmd("where %s..." % depotPath).get("path")
+        if clientPath.endswith("..."):
+            clientPath = clientPath[:-3]
+
+        if len(clientPath) == 0:
+            print "Error: Cannot locate perforce checkout of %s in client view" % depotPath
+            sys.exit(128)
+
+        print "Perforce checkout for depot path %s located at %s" % (depotPath, clientPath)
+        os.chdir(clientPath)
+        response = raw_input("Do you want to sync %s with p4 sync? (y/n)" % clientPath)
+        if response == "y" or response == "yes":
+            system("p4 sync ...")
+
+        if len(self.origin) == 0:
+            if gitBranchExists("p4"):
+                self.origin = "p4"
+            else:
+                self.origin = "origin"
+
         if self.reset:
             self.firstTime = True
 

contrib/fast-import/git-p4.txt

@@ -51,28 +51,27 @@ Submitting
 
 git-p4 has EXPERIMENTAL support for submitting changes from a git repository
 back to a Perforce depot. This requires a Perforce checkout separate to your
-git repository. This is the basic procedure:
+git repository. All it should take is calling
 
-    cd path/to/your/perforce/checkout
-    git-p4 submit --git-dir=/path/to/your/git/repository
+    git-p4 submit
 
-This will create a temporary git branch, use git-rev-list to find out which git
-commits are in your current branch but not in the "origin" branch. You can
-override the name of the "origin" branch by using the --origin=mybranch option.
-The "origin" branch has to be the branch populated with git-p4's sync
-operation.
+in your git repository. This will attempt to locate the perforce checkout
+corresponding to your imported depot path. By default the changes between your
+current branch and the "p4" branch will be submitted. If there is no "p4"
+branch the "origin" branch will be used as reference instead. You can override
+this with the --origin=mysourcebranch option. The "origin" branch has to be the
+branch populated with git-p4's sync operation.
 
 After some preparations (which might take a while) git-p4 enters a loop where
 it will first show a Perforce submit template and a diff of the change to
-apply.  After quitting the pager with 'q' git-p4 asks for confirmation for
-issuing the "p4 submit" command and also gives you the option of editing the
-submit template using "e".
+apply in the editor. After saving and exiting the editor you will be asked whether
+you really want to submit the change or not.
 
 If a submit fails you may have to "p4 resolve" and submit manually. You can
 continue importing the remaining changes with
 
-  git-p4 submit --git-dir=/path/to/your/git/repository --continue
+  git-p4 submit --continue
 
-After submitting you should sync your origin branch from Perforce using
-git-p4's sync command.
+After submitting you should sync your perforce import branch ("p4" or "origin")
+from Perforce using git-p4's sync command.