revision API: split parent rewriting and parent printing options

This change allows parent rewriting to be performed without causing
the log and rev-list commands to print the parents.

Signed-off-by: Adam Simpkins <adam@adamsimpkins.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin-rev-list.c

@@ -77,7 +77,7 @@ static void show_commit(struct commit *commit)
 		      stdout);
 	else
 		fputs(sha1_to_hex(commit->object.sha1), stdout);
-	if (revs.parents) {
+	if (revs.print_parents) {
 		struct commit_list *parents = commit->parents;
 		while (parents) {
 			printf(" %s", sha1_to_hex(parents->item->object.sha1));

log-tree.c

@@ -231,7 +231,7 @@ void show_log(struct rev_info *opt)
 				putchar('>');
 		}
 		fputs(diff_unique_abbrev(commit->object.sha1, abbrev_commit), stdout);
-		if (opt->parents)
+		if (opt->print_parents)
 			show_parents(commit, abbrev_commit);
 		show_decorations(commit);
 		putchar(opt->diffopt.line_termination);
@@ -271,7 +271,7 @@ void show_log(struct rev_info *opt)
 		}
 		fputs(diff_unique_abbrev(commit->object.sha1, abbrev_commit),
 		      stdout);
-		if (opt->parents)
+		if (opt->print_parents)
 			show_parents(commit, abbrev_commit);
 		if (parent)
 			printf(" (from %s)",

revision.c

@@ -1105,7 +1105,8 @@ int setup_revisions(int argc, const char **argv, struct rev_info *revs, const ch
 				}
 			}
 			if (!strcmp(arg, "--parents")) {
-				revs->parents = 1;
+				revs->rewrite_parents = 1;
+				revs->print_parents = 1;
 				continue;
 			}
 			if (!strcmp(arg, "--dense")) {
@@ -1524,13 +1525,13 @@ enum commit_action simplify_commit(struct rev_info *revs, struct commit *commit)
 		/* Commit without changes? */
 		if (commit->object.flags & TREESAME) {
 			/* drop merges unless we want parenthood */
-			if (!revs->parents)
+			if (!revs->rewrite_parents)
 				return commit_ignore;
 			/* non-merge - always ignore it */
 			if (!commit->parents || !commit->parents->next)
 				return commit_ignore;
 		}
-		if (revs->parents && rewrite_parents(revs, commit) < 0)
+		if (revs->rewrite_parents && rewrite_parents(revs, commit) < 0)
 			return commit_error;
 	}
 	return commit_show;

revision.h

@@ -46,7 +46,8 @@ struct rev_info {
 			unpacked:1, /* see also ignore_packed below */
 			boundary:2,
 			left_right:1,
-			parents:1,
+			rewrite_parents:1,
+			print_parents:1,
 			reverse:1,
 			cherry_pick:1,
 			first_parent_only:1;