rebase: Update --empty=ask to --empty=drop

When `git-am` got its own `--empty` option in 7c096b8 (am: support
--empty=<option> to handle empty patches, 2021-12-09), `stop` was used
instead of `ask`. `stop` is a more accurate term for describing what
really happens, and consistency is good. This commit updates
`git-rebase` to also use `stop`, while keeping `ask` as a deprecated
synonym.

In a future commit, we'll be adding a new `--empty` option for
`git-cherry-pick` as well, making the consistency even more relevant.

Signed-off-by: Brian Lyles <[email protected]>

Documentation/git-rebase.txt

@@ -289,7 +289,7 @@ See also INCOMPATIBLE OPTIONS below.
 +
 See also INCOMPATIBLE OPTIONS below.
 
---empty=(drop|keep|ask)::
+--empty=(drop|keep|stop)::
 	How to handle commits that are not empty to start and are not
 	clean cherry-picks of any upstream commit, but which become
 	empty after rebasing (because they contain a subset of already
@@ -300,12 +300,14 @@ See also INCOMPATIBLE OPTIONS below.
 	The empty commit will be dropped. This is the default behavior.
 `keep`;;
 	The empty commit will be kept.
-`ask`;;
+`stop`;;
 	The rebase will halt when the empty commit is applied, allowing you to
 	choose whether to drop it, edit files more, or just commit the empty
 	changes. This option is implied when `--interactive` is specified.
 	Other options, like `--exec`, will use the default of drop unless
 	`-i`/`--interactive` is explicitly specified.
+`ask`;;
+	A deprecated synonym of `stop`.
 --
 +
 Note that commits which start empty are kept (unless `--no-keep-empty`
@@ -702,7 +704,7 @@ be dropped automatically with `--no-keep-empty`).
 Similar to the apply backend, by default the merge backend drops
 commits that become empty unless `-i`/`--interactive` is specified (in
 which case it stops and asks the user what to do).  The merge backend
-also has an `--empty=(drop|keep|ask)` option for changing the behavior
+also has an `--empty=(drop|keep|stop)` option for changing the behavior
 of handling commits that become empty.
 
 Directory rename detection

builtin/rebase.c

@@ -62,7 +62,7 @@ enum empty_type {
 	EMPTY_UNSPECIFIED = -1,
 	EMPTY_DROP,
 	EMPTY_KEEP,
-	EMPTY_ASK
+	EMPTY_STOP
 };
 
 enum action {
@@ -963,10 +963,10 @@ static enum empty_type parse_empty_value(const char *value)
 		return EMPTY_DROP;
 	else if (!strcasecmp(value, "keep"))
 		return EMPTY_KEEP;
-	else if (!strcasecmp(value, "ask"))
-		return EMPTY_ASK;
+	else if (!strcasecmp(value, "stop") || !strcasecmp(value, "ask"))
+		return EMPTY_STOP;
 
-	die(_("unrecognized empty type '%s'; valid values are \"drop\", \"keep\", and \"ask\"."), value);
+	die(_("unrecognized empty type '%s'; valid values are \"drop\", \"keep\", and \"stop\"."), value);
 }
 
 static int parse_opt_keep_empty(const struct option *opt, const char *arg,
@@ -1145,7 +1145,7 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
 				 "instead of ignoring them"),
 			      1, PARSE_OPT_HIDDEN),
 		OPT_RERERE_AUTOUPDATE(&options.allow_rerere_autoupdate),
-		OPT_CALLBACK_F(0, "empty", &options, "(drop|keep|ask)",
+		OPT_CALLBACK_F(0, "empty", &options, "(drop|keep|stop)",
 			       N_("how to handle commits that become empty"),
 			       PARSE_OPT_NONEG, parse_opt_empty),
 		OPT_CALLBACK_F('k', "keep-empty", &options, NULL,
@@ -1562,7 +1562,7 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
 
 	if (options.empty == EMPTY_UNSPECIFIED) {
 		if (options.flags & REBASE_INTERACTIVE_EXPLICIT)
-			options.empty = EMPTY_ASK;
+			options.empty = EMPTY_STOP;
 		else if (options.exec.nr > 0)
 			options.empty = EMPTY_KEEP;
 		else

t/t3424-rebase-empty.sh

@@ -72,6 +72,17 @@ test_expect_success 'rebase --merge --empty=keep' '
 	test_cmp expect actual
 '
 
+test_expect_success 'rebase --merge --empty=stop' '
+	git checkout -B testing localmods &&
+	test_must_fail git rebase --merge --empty=stop upstream &&
+
+	git rebase --skip &&
+
+	test_write_lines D C B A >expect &&
+	git log --format=%s >actual &&
+	test_cmp expect actual
+'
+
 test_expect_success 'rebase --merge --empty=ask' '
 	git checkout -B testing localmods &&
 	test_must_fail git rebase --merge --empty=ask upstream &&
@@ -101,9 +112,9 @@ test_expect_success 'rebase --interactive --empty=keep' '
 	test_cmp expect actual
 '
 
-test_expect_success 'rebase --interactive --empty=ask' '
+test_expect_success 'rebase --interactive --empty=stop' '
 	git checkout -B testing localmods &&
-	test_must_fail git rebase --interactive --empty=ask upstream &&
+	test_must_fail git rebase --interactive --empty=stop upstream &&
 
 	git rebase --skip &&
 
@@ -112,7 +123,7 @@ test_expect_success 'rebase --interactive --empty=ask' '
 	test_cmp expect actual
 '
 
-test_expect_success 'rebase --interactive uses default of --empty=ask' '
+test_expect_success 'rebase --interactive uses default of --empty=stop' '
 	git checkout -B testing localmods &&
 	test_must_fail git rebase --interactive upstream &&