merge: make xopts a strvec

The "xopts" variable uses a custom array with ALLOC_GROW(). Using a
strvec simplifies things a bit. We need fewer variables, and we can also
ditch our custom parseopt callback in favor of OPT_STRVEC().

As a bonus, this means that "--no-strategy-option", which was previously
a silent noop, now does something useful: like other list-like options,
it will clear the list of -X options seen so far. This matches the
behavior of revert/cherry-pick, which made the same change in fb60b9f
(sequencer: use struct strvec to store merge strategy options,
2023-04-10).

Signed-off-by: Jeff King <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: peff

builtin/merge.c

@@ -79,8 +79,7 @@ static int overwrite_ignore = 1;
 static struct strbuf merge_msg = STRBUF_INIT;
 static struct strategy **use_strategies;
 static size_t use_strategies_nr, use_strategies_alloc;
-static const char **xopts;
-static size_t xopts_nr, xopts_alloc;
+static struct strvec xopts = STRVEC_INIT;
 static const char *branch;
 static char *branch_mergeoptions;
 static int verbosity;
@@ -242,17 +241,6 @@ static int option_parse_strategy(const struct option *opt,
 	return 0;
 }
 
-static int option_parse_x(const struct option *opt,
-			  const char *arg, int unset)
-{
-	if (unset)
-		return 0;
-
-	ALLOC_GROW(xopts, xopts_nr + 1, xopts_alloc);
-	xopts[xopts_nr++] = xstrdup(arg);
-	return 0;
-}
-
 static int option_parse_n(const struct option *opt,
 			  const char *arg, int unset)
 {
@@ -287,8 +275,8 @@ static struct option builtin_merge_options[] = {
 		N_("verify that the named commit has a valid GPG signature")),
 	OPT_CALLBACK('s', "strategy", &use_strategies, N_("strategy"),
 		N_("merge strategy to use"), option_parse_strategy),
-	OPT_CALLBACK('X', "strategy-option", &xopts, N_("option=value"),
-		N_("option for selected merge strategy"), option_parse_x),
+	OPT_STRVEC('X', "strategy-option", &xopts, N_("option=value"),
+		N_("option for selected merge strategy")),
 	OPT_CALLBACK('m', "message", &merge_msg, N_("message"),
 		N_("merge commit message (for a non-fast-forward merge)"),
 		option_parse_message),
@@ -749,9 +737,9 @@ static int try_merge_strategy(const char *strategy, struct commit_list *common,
 		o.show_rename_progress =
 			show_progress == -1 ? isatty(2) : show_progress;
 
-		for (x = 0; x < xopts_nr; x++)
-			if (parse_merge_opt(&o, xopts[x]))
-				die(_("unknown strategy option: -X%s"), xopts[x]);
+		for (x = 0; x < xopts.nr; x++)
+			if (parse_merge_opt(&o, xopts.v[x]))
+				die(_("unknown strategy option: -X%s"), xopts.v[x]);
 
 		o.branch1 = head_arg;
 		o.branch2 = merge_remote_util(remoteheads->item)->name;
@@ -777,7 +765,7 @@ static int try_merge_strategy(const char *strategy, struct commit_list *common,
 		return clean ? 0 : 1;
 	} else {
 		return try_merge_command(the_repository,
-					 strategy, xopts_nr, xopts,
+					 strategy, xopts.nr, xopts.v,
 					 common, head_arg, remoteheads);
 	}
 }