pretty: prepare notes message at a centralized place

Instead of passing a boolean show_notes around, pass an optional
string that is to be inserted after the log message proper is shown.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

commit.h

@@ -86,7 +86,7 @@ struct pretty_print_context {
 	enum date_mode date_mode;
 	unsigned date_mode_explicit:1;
 	int need_8bit_cte;
-	int show_notes;
+	char *notes_message;
 	struct reflog_walk_info *reflog_info;
 	const char *output_encoding;
 };

log-tree.c

@@ -540,7 +540,6 @@ void show_log(struct rev_info *opt)
 	struct pretty_print_context ctx = {0};
 
 	opt->loginfo = NULL;
-	ctx.show_notes = opt->show_notes;
 	if (!opt->verbose_header) {
 		graph_show_commit(opt->graph);
 
@@ -648,6 +647,18 @@ void show_log(struct rev_info *opt)
 	if (!commit->buffer)
 		return;
 
+	if (opt->show_notes) {
+		int raw;
+		struct strbuf notebuf = STRBUF_INIT;
+
+		raw = (opt->commit_format == CMIT_FMT_USERFORMAT);
+		format_display_notes(commit->object.sha1, &notebuf,
+				     get_log_output_encoding(), raw);
+		ctx.notes_message = notebuf.len
+			? strbuf_detach(&notebuf, NULL)
+			: xcalloc(1, 1);
+	}
+
 	/*
 	 * And then the pretty-printed message itself
 	 */
@@ -689,6 +700,7 @@ void show_log(struct rev_info *opt)
 	}
 
 	strbuf_release(&msgbuf);
+	free(ctx.notes_message);
 }
 
 int log_tree_diff_flush(struct rev_info *opt)

pretty.c

@@ -1033,9 +1033,8 @@ static size_t format_commit_one(struct strbuf *sb, const char *placeholder,
 		}
 		return 0;	/* unknown %g placeholder */
 	case 'N':
-		if (c->pretty_ctx->show_notes) {
-			format_display_notes(commit->object.sha1, sb,
-					     get_log_output_encoding(), 1);
+		if (c->pretty_ctx->notes_message) {
+			strbuf_addstr(sb, c->pretty_ctx->notes_message);
 			return 1;
 		}
 		return 0;
@@ -1418,8 +1417,8 @@ void pretty_print_commit(const struct pretty_print_context *pp,
 	if (pp->fmt == CMIT_FMT_EMAIL && sb->len <= beginning_of_body)
 		strbuf_addch(sb, '\n');
 
-	if (pp->show_notes)
-		format_display_notes(commit->object.sha1, sb, encoding, 0);
+	if (pp->notes_message && *pp->notes_message)
+		strbuf_addstr(sb, pp->notes_message);
 
 	free(reencoded);
 }