[PATCH v2 3/4] git-p4: add hook p4-pre-edit-changelist

["Ben Keene via GitGitGadget" <gitgitgadget@gmail.com>]

From: Ben Keene <seraphire@gmail.com>

Add an additional hook to the git-p4 command to allow a hook to modify
the text of the changelist prior to displaying the p4editor command.

This hook will be called prior to checking for the flag
"--prepare-p4-only".

The hook is optional, if it does not exist, it will be skipped.

The hook takes a single parameter, the filename of the temporary file
that contains the P4 submit text.

The hook should return a zero exit code on success or a non-zero exit
code on failure.  If the hook returns a non-zero exit code, git-p4
will revert the P4 edits by calling p4_revert(f) on each file that was
flagged as edited and then it will return False so the calling method
may continue as it does in existing failure cases.

Signed-off-by: Ben Keene <seraphire@gmail.com>
---
 git-p4.py | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/git-p4.py b/git-p4.py
index 4e481b3b55..61cfd1c1ae 100755
--- a/git-p4.py
+++ b/git-p4.py
@@ -2030,6 +2030,17 @@ def applyCommit(self, id):
         tmpFile.write(submitTemplate)
         tmpFile.close()
 
+        # Run the pre-edit hook to allow programmatic update to the changelist
+        hooks_path = gitConfig("core.hooksPath")
+        if len(hooks_path) <= 0:
+            hooks_path = os.path.join(os.environ.get("GIT_DIR", ".git"), "hooks")
+
+        hook_file = os.path.join(hooks_path, "p4-pre-edit-changelist")
+        if os.path.isfile(hook_file) and os.access(hook_file, os.X_OK) and subprocess.call([hook_file, fileName]) != 0:
+            for f in editedFiles:
+                p4_revert(f)
+            return False
+
         if self.prepare_p4_only:
             #
             # Leave the p4 tree prepared, and the submit template around
-- 
gitgitgadget