builtin/merge.c - cleanup of code in for-cycle that tests strategies

The cmd_merge() function has a loop that tries different
merge strategies in turn, and stops when a strategy gets a
clean merge, while keeping the "best" conflicted merge so
far.

Make the loop easier to follow by moving the code around,
ensuring that there is only one "break" in the loop where
an automerge succeeds.  Also group the actions that are
performed after an automerge succeeds together to a single
location, outside and after the loop.

Signed-off-by: Edmundo Carmona Antoranz <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: eantoranz

builtin/merge.c

@@ -892,6 +892,7 @@ static int finish_automerge(struct commit *head,
 	struct strbuf buf = STRBUF_INIT;
 	struct object_id result_commit;
 
+	write_tree_trivial(result_tree);
 	free_commit_list(common);
 	parents = remoteheads;
 	if (!head_subsumed || fast_forward == FF_NO)
@@ -1586,8 +1587,8 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
 	    save_state(&stash))
 		oidclr(&stash);
 
-	for (i = 0; i < use_strategies_nr; i++) {
-		int ret;
+	for (i = 0; !merge_was_ok && i < use_strategies_nr; i++) {
+		int ret, cnt;
 		if (i) {
 			printf(_("Rewinding the tree to pristine...\n"));
 			restore_state(&head_commit->object.oid, &stash);
@@ -1604,40 +1605,26 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
 		ret = try_merge_strategy(use_strategies[i]->name,
 					 common, remoteheads,
 					 head_commit);
-		if (!option_commit && !ret) {
-			merge_was_ok = 1;
-			/*
-			 * This is necessary here just to avoid writing
-			 * the tree, but later we will *not* exit with
-			 * status code 1 because merge_was_ok is set.
-			 */
-			ret = 1;
-		}
-
-		if (ret) {
-			/*
-			 * The backend exits with 1 when conflicts are
-			 * left to be resolved, with 2 when it does not
-			 * handle the given merge at all.
-			 */
-			if (ret == 1) {
-				int cnt = evaluate_result();
-
-				if (best_cnt <= 0 || cnt <= best_cnt) {
-					best_strategy = use_strategies[i]->name;
-					best_cnt = cnt;
+		/*
+		 * The backend exits with 1 when conflicts are
+		 * left to be resolved, with 2 when it does not
+		 * handle the given merge at all.
+		 */
+		if (ret < 2) {
+			if (!ret) {
+				if (option_commit) {
+					/* Automerge succeeded. */
+					automerge_was_ok = 1;
+					break;
 				}
+				merge_was_ok = 1;
+			}
+			cnt = evaluate_result();
+			if (best_cnt <= 0 || cnt <= best_cnt) {
+				best_strategy = use_strategies[i]->name;
+				best_cnt = cnt;
 			}
-			if (merge_was_ok)
-				break;
-			else
-				continue;
 		}
-
-		/* Automerge succeeded. */
-		write_tree_trivial(&result_tree);
-		automerge_was_ok = 1;
-		break;
 	}
 
 	/*