sequencer: use the "resolve" strategy without forking

This teaches the sequencer to invoke the "resolve" strategy with a
function call instead of forking.

Signed-off-by: Alban Gruin <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: agrn

sequencer.c

@@ -33,6 +33,7 @@
 #include "commit-reach.h"
 #include "rebase-interactive.h"
 #include "reset.h"
+#include "merge-strategies.h"
 
 #define GIT_REFLOG_ACTION "GIT_REFLOG_ACTION"
 
@@ -2008,9 +2009,15 @@ static int do_pick_commit(struct repository *r,
 
 		commit_list_insert(base, &common);
 		commit_list_insert(next, &remotes);
-		res |= try_merge_command(r, opts->strategy,
-					 opts->xopts_nr, (const char **)opts->xopts,
-					common, oid_to_hex(&head), remotes);
+
+		if (!strcmp(opts->strategy, "resolve")) {
+			repo_read_index(r);
+			res |= merge_strategies_resolve(r, common, oid_to_hex(&head), remotes);
+		} else
+			res |= try_merge_command(r, opts->strategy,
+						 opts->xopts_nr, (const char **)opts->xopts,
+						 common, oid_to_hex(&head), remotes);
+
 		free_commit_list(common);
 		free_commit_list(remotes);
 	}