[PATCH v2 2/3] pack-objects: use the missing action API

[Christian Couder <christian.couder@xxxxxxxxx>]

Both `git rev-list` and `git pack-objects` support a
`--missing=<missing-action>` option. Previous commits created an API
in "missing.{c,h}" to help supporting that option, but only
`git rev-list` has been using that API so far.

Let's make `git pack-objects` use it too.

This involves creating a new show_object_fn_from_action() function to
set the `fn_show_object` variable independently from parsing the
missing action, which is now performed by the
parse_missing_action_value() API function.

Signed-off-by: Christian Couder <chriscool@xxxxxxxxxxxxx>
---
 builtin/pack-objects.c | 48 ++++++++++++++++++++++--------------------
 1 file changed, 25 insertions(+), 23 deletions(-)

diff --git a/builtin/pack-objects.c b/builtin/pack-objects.c
index baf0090fc8..55d08c686d 100644
--- a/builtin/pack-objects.c
+++ b/builtin/pack-objects.c
@@ -39,6 +39,7 @@
 #include "promisor-remote.h"
 #include "pack-mtimes.h"
 #include "parse-options.h"
+#include "missing.h"
 
 /*
  * Objects we are going to pack are collected in the `to_pack` structure.
@@ -250,11 +251,6 @@ static unsigned long window_memory_limit = 0;
 
 static struct string_list uri_protocols = STRING_LIST_INIT_NODUP;
 
-enum missing_action {
-	MA_ERROR = 0,      /* fail if any missing objects are encountered */
-	MA_ALLOW_ANY,      /* silently allow ALL missing objects */
-	MA_ALLOW_PROMISOR, /* silently allow all missing PROMISOR objects */
-};
 static enum missing_action arg_missing_action;
 static show_object_fn fn_show_object;
 
@@ -3826,33 +3822,39 @@ static void show_object__ma_allow_promisor(struct object *obj, const char *name,
 	show_object(obj, name, data);
 }
 
+static show_object_fn show_object_fn_from_action(enum missing_action action)
+{
+	switch (action) {
+	case MA_ERROR:
+		return show_object;
+	case MA_ALLOW_ANY:
+		return show_object__ma_allow_any;
+	case MA_ALLOW_PROMISOR:
+		return show_object__ma_allow_promisor;
+	default:
+		BUG("invalid missing action %d", action);
+	}
+}
+
 static int option_parse_missing_action(const struct option *opt UNUSED,
 				       const char *arg, int unset)
 {
+	int res;
+
 	assert(arg);
 	assert(!unset);
 
-	if (!strcmp(arg, "error")) {
-		arg_missing_action = MA_ERROR;
-		fn_show_object = show_object;
-		return 0;
-	}
+	res = parse_missing_action_value(arg);
+	if (res < 0 || (res != MA_ERROR &&
+			res != MA_ALLOW_ANY &&
+			res != MA_ALLOW_PROMISOR))
+		die(_("invalid value for '%s': '%s'"), "--missing", arg);
 
-	if (!strcmp(arg, "allow-any")) {
-		arg_missing_action = MA_ALLOW_ANY;
+	if (res != MA_ERROR)
 		fetch_if_missing = 0;
-		fn_show_object = show_object__ma_allow_any;
-		return 0;
-	}
-
-	if (!strcmp(arg, "allow-promisor")) {
-		arg_missing_action = MA_ALLOW_PROMISOR;
-		fetch_if_missing = 0;
-		fn_show_object = show_object__ma_allow_promisor;
-		return 0;
-	}
+	arg_missing_action = res;
+	fn_show_object = show_object_fn_from_action(arg_missing_action);
 
-	die(_("invalid value for '%s': '%s'"), "--missing", arg);
 	return 0;
 }
 
-- 
2.45.1.148.g0f5efb064b