[PATCH 3/3] revert: improve error message for cherry-pick during cherry-pick

[Jonathan Nieder <jrnieder@xxxxxxxxx>]

In the spirit of v1.6.3.3~3^2 (refuse to merge during a merge,
2009-07-01), "git cherry-pick" refuses to start a new cherry-pick when
in the middle of an existing conflicted cherry-pick in the following
sequence:

 1. git cherry-pick HEAD..origin
 2. resolve conflicts
 3. git cherry-pick HEAD..origin (instead of "git cherry-pick
    --continue", by mistake)

Good.  However, the error message on attempting step 3 is more
convoluted than necessary:

  $ git cherry-pick HEAD..origin
  error: .git/sequencer already exists.
  error: A cherry-pick or revert is in progress.
  hint: Use --continue to continue the operation
  hint: or --quit to forget about it
  fatal: cherry-pick failed

Clarify by removing the double redundant first "error:" message,
simplifying the advice, and using lower-case and no full stops to be
consistent with other commands that prefix their messages with
"error:", so it becomes

  error: a cherry-pick or revert is already in progress
  hint: try "git cherry-pick (--continue | --quit)"
  fatal: cherry-pick failed

The "fatal: cherry-pick failed" line seems unnecessary, too, but
that can be fixed some other day.

Signed-off-by: Jonathan Nieder <jrnieder@xxxxxxxxx>
---
That's the end of the series.  There are more error messages, but
let's start with this one.

Thanks for reading.

 builtin/revert.c |   13 ++++++-------
 1 files changed, 6 insertions(+), 7 deletions(-)

diff --git a/builtin/revert.c b/builtin/revert.c
index dd072ce6..9db4c1e4 100644
--- a/builtin/revert.c
+++ b/builtin/revert.c
@@ -843,8 +843,11 @@ static int create_seq_dir(void)
 {
 	const char *seq_dir = git_path(SEQ_DIR);
 
-	if (file_exists(seq_dir))
-		return error(_("%s already exists."), seq_dir);
+	if (file_exists(seq_dir)) {
+		error(_("a cherry-pick or revert is already in progress"));
+		advise(_("try \"git cherry-pick (--continue | --quit)\""));
+		return -1;
+	}
 	else if (mkdir(seq_dir, 0777) < 0)
 		die_errno(_("Could not create sequencer directory %s"), seq_dir);
 	return 0;
@@ -988,12 +991,8 @@ static int pick_revisions(struct replay_opts *opts)
 	 */
 
 	walk_revs_populate_todo(&todo_list, opts);
-	if (create_seq_dir() < 0) {
-		error(_("A cherry-pick or revert is in progress."));
-		advise(_("Use --continue to continue the operation"));
-		advise(_("or --quit to forget about it"));
+	if (create_seq_dir() < 0)
 		return -1;
-	}
 	if (get_sha1("HEAD", sha1)) {
 		if (opts->action == REVERT)
 			return error(_("Can't revert as initial commit"));
-- 
1.7.8.rc3

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