use strbuf_add_unique_abbrev() for adding short hashes, part 3

Call strbuf_add_unique_abbrev() to add abbreviated hashes to strbufs
instead of taking detours through find_unique_abbrev() and its static
buffer.  This is shorter in most cases and a bit more efficient.

The changes here are not easily handled by a semantic patch because
they involve removing temporary variables and deconstructing format
strings for strbuf_addf().

Signed-off-by: Rene Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

merge-recursive.c

@@ -202,9 +202,9 @@ static void output_commit_title(struct merge_options *o, struct commit *commit)
 		strbuf_addf(&o->obuf, "virtual %s\n",
 			merge_remote_util(commit)->name);
 	else {
-		strbuf_addf(&o->obuf, "%s ",
-			find_unique_abbrev(commit->object.oid.hash,
-				DEFAULT_ABBREV));
+		strbuf_add_unique_abbrev(&o->obuf, commit->object.oid.hash,
+					 DEFAULT_ABBREV);
+		strbuf_addch(&o->obuf, ' ');
 		if (parse_commit(commit) != 0)
 			strbuf_addstr(&o->obuf, _("(bad commit)\n"));
 		else {

pretty.c

@@ -544,15 +544,13 @@ static void add_merge_info(const struct pretty_print_context *pp,
 	strbuf_addstr(sb, "Merge:");
 
 	while (parent) {
-		struct commit *p = parent->item;
-		const char *hex = NULL;
+		struct object_id *oidp = &parent->item->object.oid;
+		strbuf_addch(sb, ' ');
 		if (pp->abbrev)
-			hex = find_unique_abbrev(p->object.oid.hash, pp->abbrev);
-		if (!hex)
-			hex = oid_to_hex(&p->object.oid);
+			strbuf_add_unique_abbrev(sb, oidp->hash, pp->abbrev);
+		else
+			strbuf_addstr(sb, oid_to_hex(oidp));
 		parent = parent->next;
-
-		strbuf_addf(sb, " %s", hex);
 	}
 	strbuf_addch(sb, '\n');
 }

submodule.c

@@ -370,10 +370,9 @@ void show_submodule_summary(FILE *f, const char *path,
 		return;
 	}
 
-	strbuf_addf(&sb, "%s%sSubmodule %s %s..", line_prefix, meta, path,
-			find_unique_abbrev(one, DEFAULT_ABBREV));
-	if (!fast_backward && !fast_forward)
-		strbuf_addch(&sb, '.');
+	strbuf_addf(&sb, "%s%sSubmodule %s ", line_prefix, meta, path);
+	strbuf_add_unique_abbrev(&sb, one, DEFAULT_ABBREV);
+	strbuf_addstr(&sb, (fast_backward || fast_forward) ? ".." : "...");
 	strbuf_add_unique_abbrev(&sb, two, DEFAULT_ABBREV);
 	if (message)
 		strbuf_addf(&sb, " %s%s\n", message, reset);

wt-status.c

@@ -1053,7 +1053,6 @@ static void abbrev_sha1_in_line(struct strbuf *line)
 	split = strbuf_split_max(line, ' ', 3);
 	if (split[0] && split[1]) {
 		unsigned char sha1[20];
-		const char *abbrev;
 
 		/*
 		 * strbuf_split_max left a space. Trim it and re-add
@@ -1061,9 +1060,10 @@ static void abbrev_sha1_in_line(struct strbuf *line)
 		 */
 		strbuf_trim(split[1]);
 		if (!get_sha1(split[1]->buf, sha1)) {
-			abbrev = find_unique_abbrev(sha1, DEFAULT_ABBREV);
 			strbuf_reset(split[1]);
-			strbuf_addf(split[1], "%s ", abbrev);
+			strbuf_add_unique_abbrev(split[1], sha1,
+						 DEFAULT_ABBREV);
+			strbuf_addch(split[1], ' ');
 			strbuf_reset(line);
 			for (i = 0; split[i]; i++)
 				strbuf_addbuf(line, split[i]);
@@ -1286,10 +1286,8 @@ static char *get_branch(const struct worktree *wt, const char *path)
 	else if (starts_with(sb.buf, "refs/"))
 		;
 	else if (!get_sha1_hex(sb.buf, sha1)) {
-		const char *abbrev;
-		abbrev = find_unique_abbrev(sha1, DEFAULT_ABBREV);
 		strbuf_reset(&sb);
-		strbuf_addstr(&sb, abbrev);
+		strbuf_add_unique_abbrev(&sb, sha1, DEFAULT_ABBREV);
 	} else if (!strcmp(sb.buf, "detached HEAD")) /* rebase */
 		goto got_nothing;
 	else			/* bisect */