pretty: add pointer and tag options to %(decorate)

Add pointer and tag options to %(decorate) format, to allow to override
the " -> " string used to show where HEAD points and the "tag: " string
used to mark tags.

Document in pretty-formats.txt and test in t4205-log-pretty-formats.sh.

Signed-off-by: Andy Koppe <andy.koppe@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/pretty-formats.txt

@@ -233,6 +233,15 @@ parentheses (`%x29`), due to their role in the option syntax.
 ** 'prefix=<value>': Shown before the list of ref names.  Defaults to "{nbsp}`(`".
 ** 'suffix=<value>': Shown after the list of ref names.  Defaults to "`)`".
 ** 'separator=<value>': Shown between ref names.  Defaults to "`,`{nbsp}".
+** 'pointer=<value>': Shown between HEAD and the branch it points to, if any.
+		      Defaults to "{nbsp}`->`{nbsp}".
+** 'tag=<value>': Shown before tag names. Defaults to "`tag:`{nbsp}".
+
++
+For example, to produce decorations with no wrapping
+or tag annotations, and spaces as separators:
++
+`%(decorate:prefix=,suffix=,tag=,separator= )`
 
 '%(describe[:<options>])'::
 human-readable name, like linkgit:git-describe[1]; empty string for

log-tree.c

@@ -317,6 +317,8 @@ void format_decorations(struct strbuf *sb,
 	const char *prefix = " (";
 	const char *suffix = ")";
 	const char *separator = ", ";
+	const char *pointer = " -> ";
+	const char *tag = "tag: ";
 
 	decoration = get_name_decoration(&commit->object);
 	if (!decoration)
@@ -329,6 +331,10 @@ void format_decorations(struct strbuf *sb,
 			suffix = opts->suffix;
 		if (opts->separator)
 			separator = opts->separator;
+		if (opts->pointer)
+			pointer = opts->pointer;
+		if (opts->tag)
+			tag = opts->tag;
 	}
 
 	color_commit = diff_get_color(use_color, DIFF_COMMIT);
@@ -351,9 +357,9 @@ void format_decorations(struct strbuf *sb,
 				strbuf_addstr(sb, color_reset);
 			}
 
-			if (decoration->type == DECORATION_REF_TAG) {
+			if (*tag && decoration->type == DECORATION_REF_TAG) {
 				strbuf_addstr(sb, color);
-				strbuf_addstr(sb, "tag: ");
+				strbuf_addstr(sb, tag);
 				strbuf_addstr(sb, color_reset);
 			}
 
@@ -364,7 +370,7 @@ void format_decorations(struct strbuf *sb,
 			if (current_and_HEAD &&
 			    decoration->type == DECORATION_REF_HEAD) {
 				strbuf_addstr(sb, color);
-				strbuf_addstr(sb, " -> ");
+				strbuf_addstr(sb, pointer);
 				strbuf_addstr(sb, color_reset);
 				strbuf_addstr(sb, decorate_get_color(use_color, current_and_HEAD->type));
 				show_name(sb, current_and_HEAD);

log-tree.h

@@ -17,6 +17,8 @@ struct decoration_options {
 	char *prefix;
 	char *suffix;
 	char *separator;
+	char *pointer;
+	char *tag;
 };
 
 int parse_decorate_color_config(const char *var, const char *slot_name, const char *value);

pretty.c

@@ -1407,7 +1407,9 @@ static void parse_decoration_options(const char **arg,
 {
 	while (parse_decoration_option(arg, "prefix", &opts->prefix) ||
 	       parse_decoration_option(arg, "suffix", &opts->suffix) ||
-	       parse_decoration_option(arg, "separator", &opts->separator))
+	       parse_decoration_option(arg, "separator", &opts->separator) ||
+	       parse_decoration_option(arg, "pointer", &opts->pointer) ||
+	       parse_decoration_option(arg, "tag", &opts->tag))
 		;
 }
 
@@ -1416,6 +1418,8 @@ static void free_decoration_options(const struct decoration_options *opts)
 	free(opts->prefix);
 	free(opts->suffix);
 	free(opts->separator);
+	free(opts->pointer);
+	free(opts->tag);
 }
 
 static size_t format_commit_one(struct strbuf *sb, /* in UTF-8 */

t/t4205-log-pretty-formats.sh

@@ -600,7 +600,12 @@ test_expect_success 'pretty format %decorate' '
 	echo "%(decorate:prefix=[ ,suffix= ],separater=; )" >expect4 &&
 	git log --format="%(decorate:prefix=[ ,suffix= ],separater=%x3B )" \
 		-1 >actual4 &&
-	test_cmp expect4 actual4
+	test_cmp expect4 actual4 &&
+
+	echo "HEAD->foo bar qux" >expect5 &&
+	git log --format="%(decorate:prefix=,suffix=,separator= ,tag=,pointer=->)" \
+		-1 >actual5 &&
+	test_cmp expect5 actual5
 '
 
 cat >trailers <<EOF