[PATCH v4 3/8] decorate: refactor format_decorations()

[Andy Koppe <andy.koppe@gmail.com>]

Rename the format_decorations_extended function to format_decorations
and drop the format_decorations wrapper macro. Pass the prefix, suffix
and separator strings as a single 'struct format_decorations' pointer
argument instead of separate arguments. Use default values defined in
the function when either the struct pointer or any of the struct fields
are NULL. This is to ease extension with additional options.

Signed-off-by: Andy Koppe <andy.koppe@gmail.com>
---
 log-tree.c | 23 +++++++++++++++++------
 log-tree.h | 15 ++++++++-------
 pretty.c   |  6 ++++--
 3 files changed, 29 insertions(+), 15 deletions(-)

diff --git a/log-tree.c b/log-tree.c
index 208c69cbb7..cd12c26c29 100644
--- a/log-tree.c
+++ b/log-tree.c
@@ -303,14 +303,12 @@ static void show_name(struct strbuf *sb, const struct name_decoration *decoratio
 
 /*
  * The caller makes sure there is no funny color before calling.
- * format_decorations_extended makes sure the same after return.
+ * format_decorations ensures the same after return.
  */
-void format_decorations_extended(struct strbuf *sb,
+void format_decorations(struct strbuf *sb,
 			const struct commit *commit,
 			int use_color,
-			const char *prefix,
-			const char *separator,
-			const char *suffix)
+			const struct decoration_options *opts)
 {
 	const struct name_decoration *decoration;
 	const struct name_decoration *current_and_HEAD;
@@ -319,10 +317,23 @@ void format_decorations_extended(struct strbuf *sb,
 	const char *color_reset =
 		decorate_get_color(use_color, DECORATION_NONE);
 
+	const char *prefix = " (";
+	const char *suffix = ")";
+	const char *separator = ", ";
+
 	decoration = get_name_decoration(&commit->object);
 	if (!decoration)
 		return;
 
+	if (opts) {
+		if (opts->prefix)
+			prefix = opts->prefix;
+		if (opts->suffix)
+			suffix = opts->suffix;
+		if (opts->separator)
+			separator = opts->separator;
+	}
+
 	current_and_HEAD = current_pointed_by_HEAD(decoration);
 	while (decoration) {
 		/*
@@ -370,7 +381,7 @@ void show_decorations(struct rev_info *opt, struct commit *commit)
 	}
 	if (!opt->show_decorations)
 		return;
-	format_decorations(&sb, commit, opt->diffopt.use_color);
+	format_decorations(&sb, commit, opt->diffopt.use_color, NULL);
 	fputs(sb.buf, opt->diffopt.file);
 	strbuf_release(&sb);
 }
diff --git a/log-tree.h b/log-tree.h
index bdb6432815..14898de8ac 100644
--- a/log-tree.h
+++ b/log-tree.h
@@ -13,17 +13,18 @@ struct decoration_filter {
 	struct string_list *exclude_ref_config_pattern;
 };
 
+struct decoration_options {
+	char *prefix;
+	char *suffix;
+	char *separator;
+};
+
 int parse_decorate_color_config(const char *var, const char *slot_name, const char *value);
 int log_tree_diff_flush(struct rev_info *);
 int log_tree_commit(struct rev_info *, struct commit *);
 void show_log(struct rev_info *opt);
-void format_decorations_extended(struct strbuf *sb, const struct commit *commit,
-			     int use_color,
-			     const char *prefix,
-			     const char *separator,
-			     const char *suffix);
-#define format_decorations(strbuf, commit, color) \
-			     format_decorations_extended((strbuf), (commit), (color), " (", ", ", ")")
+void format_decorations(struct strbuf *sb, const struct commit *commit,
+			int use_color, const struct decoration_options *opts);
 void show_decorations(struct rev_info *opt, struct commit *commit);
 void log_write_email_headers(struct rev_info *opt, struct commit *commit,
 			     const char **extra_headers_p,
diff --git a/pretty.c b/pretty.c
index 718530bbab..24fb82a5a2 100644
--- a/pretty.c
+++ b/pretty.c
@@ -1537,10 +1537,12 @@ static size_t format_commit_one(struct strbuf *sb, /* in UTF-8 */
 		strbuf_addstr(sb, get_revision_mark(NULL, commit));
 		return 1;
 	case 'd':
-		format_decorations(sb, commit, c->auto_color);
+		format_decorations(sb, commit, c->auto_color, NULL);
 		return 1;
 	case 'D':
-		format_decorations_extended(sb, commit, c->auto_color, "", ", ", "");
+		format_decorations(sb, commit, c->auto_color,
+			&(struct decoration_options){.prefix = "",
+						     .suffix = ""});
 		return 1;
 	case 'S':		/* tag/branch like --source */
 		if (!(c->pretty_ctx->rev && c->pretty_ctx->rev->sources))
-- 
2.42.0-rc2