1 files changed, 116 insertions, 0 deletions
diff --git a/builtin/range-diff.c b/builtin/range-diff.c
new file mode 100644
index 0000000000..f52d45d9d6
--- /dev/null
+++ b/builtin/range-diff.c
@@ -0,0 +1,116 @@
+#include "cache.h"
+#include "builtin.h"
+#include "parse-options.h"
+#include "range-diff.h"
+#include "config.h"
+
+static const char * const builtin_range_diff_usage[] = {
+N_("git range-diff [<options>] <old-base>..<old-tip> <new-base>..<new-tip>"),
+N_("git range-diff [<options>] <old-tip>...<new-tip>"),
+N_("git range-diff [<options>] <base> <old-tip> <new-tip>"),
+NULL
+};
+
+static struct strbuf *output_prefix_cb(struct diff_options *opt, void *data)
+{
+	return data;
+}
+
+int cmd_range_diff(int argc, const char **argv, const char *prefix)
+{
+	int creation_factor = 60;
+	struct diff_options diffopt = { NULL };
+	int simple_color = -1;
+	struct option options[] = {
+		OPT_INTEGER(0, "creation-factor", &creation_factor,
+			    N_("Percentage by which creation is weighted")),
+		OPT_BOOL(0, "no-dual-color", &simple_color,
+			    N_("color both diff and diff-between-diffs")),
+		OPT_END()
+	};
+	int i, j, res = 0;
+	struct strbuf four_spaces = STRBUF_INIT;
+	struct strbuf range1 = STRBUF_INIT, range2 = STRBUF_INIT;
+
+	git_config(git_diff_ui_config, NULL);
+
+	diff_setup(&diffopt);
+	diffopt.output_format = DIFF_FORMAT_PATCH;
+	diffopt.flags.suppress_diff_headers = 1;
+	diffopt.output_prefix = output_prefix_cb;
+	strbuf_addstr(&four_spaces, "    ");
+	diffopt.output_prefix_data = &four_spaces;
+
+	argc = parse_options(argc, argv, NULL, options,
+			     builtin_range_diff_usage, PARSE_OPT_KEEP_UNKNOWN |
+			     PARSE_OPT_KEEP_DASHDASH | PARSE_OPT_KEEP_ARGV0);
+
+	for (i = j = 1; i < argc && strcmp("--", argv[i]); ) {
+		int c = diff_opt_parse(&diffopt, argv + i, argc - i, prefix);
+
+		if (!c)
+			argv[j++] = argv[i++];
+		else
+			i += c;
+	}
+	while (i < argc)
+		argv[j++] = argv[i++];
+	argc = j;
+	diff_setup_done(&diffopt);
+
+	/* Make sure that there are no unparsed options */
+	argc = parse_options(argc, argv, NULL,
+			     options + ARRAY_SIZE(options) - 1, /* OPT_END */
+			     builtin_range_diff_usage, 0);
+
+	if (simple_color < 1) {
+		if (!simple_color)
+			/* force color when --dual-color was used */
+			diffopt.use_color = 1;
+		diffopt.flags.dual_color_diffed_diffs = 1;
+	}
+
+	if (argc == 2) {
+		if (!strstr(argv[0], ".."))
+			die(_("no .. in range: '%s'"), argv[0]);
+		strbuf_addstr(&range1, argv[0]);
+
+		if (!strstr(argv[1], ".."))
+			die(_("no .. in range: '%s'"), argv[1]);
+		strbuf_addstr(&range2, argv[1]);
+	} else if (argc == 3) {
+		strbuf_addf(&range1, "%s..%s", argv[0], argv[1]);
+		strbuf_addf(&range2, "%s..%s", argv[0], argv[2]);
+	} else if (argc == 1) {
+		const char *b = strstr(argv[0], "..."), *a = argv[0];
+		int a_len;
+
+		if (!b) {
+			error(_("single arg format must be symmetric range"));
+			usage_with_options(builtin_range_diff_usage, options);
+		}
+
+		a_len = (int)(b - a);
+		if (!a_len) {
+			a = "HEAD";
+			a_len = strlen(a);
+		}
+		b += 3;
+		if (!*b)
+			b = "HEAD";
+		strbuf_addf(&range1, "%s..%.*s", b, a_len, a);
+		strbuf_addf(&range2, "%.*s..%s", a_len, a, b);
+	} else {
+		error(_("need two commit ranges"));
+		usage_with_options(builtin_range_diff_usage, options);
+	}
+
+	res = show_range_diff(range1.buf, range2.buf, creation_factor,
+			      &diffopt);
+
+	strbuf_release(&range1);
+	strbuf_release(&range2);
+	strbuf_release(&four_spaces);
+
+	return res;
+}