1 files changed, 104 insertions, 0 deletions
diff --git a/builtin/range-diff.c b/builtin/range-diff.c
new file mode 100644
index 0000000000..50318849d6
--- /dev/null
+++ b/builtin/range-diff.c
@@ -0,0 +1,104 @@
+#include "cache.h"
+#include "builtin.h"
+#include "parse-options.h"
+#include "range-diff.h"
+#include "config.h"
+#include "revision.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
+};
+
+int cmd_range_diff(int argc, const char **argv, const char *prefix)
+{
+	struct diff_options diffopt = { NULL };
+	struct strvec other_arg = STRVEC_INIT;
+	struct range_diff_options range_diff_opts = {
+		.creation_factor = RANGE_DIFF_CREATION_FACTOR_DEFAULT,
+		.diffopt = &diffopt,
+		.other_arg = &other_arg
+	};
+	int simple_color = -1, left_only = 0, right_only = 0;
+	struct option range_diff_options[] = {
+		OPT_INTEGER(0, "creation-factor",
+			    &range_diff_opts.creation_factor,
+			    N_("percentage by which creation is weighted")),
+		OPT_BOOL(0, "no-dual-color", &simple_color,
+			    N_("use simple diff colors")),
+		OPT_PASSTHRU_ARGV(0, "notes", &other_arg,
+				  N_("notes"), N_("passed to 'git log'"),
+				  PARSE_OPT_OPTARG),
+		OPT_BOOL(0, "left-only", &left_only,
+			 N_("only emit output related to the first range")),
+		OPT_BOOL(0, "right-only", &right_only,
+			 N_("only emit output related to the second range")),
+		OPT_END()
+	};
+	struct option *options;
+	int res = 0;
+	struct strbuf range1 = STRBUF_INIT, range2 = STRBUF_INIT;
+
+	git_config(git_diff_ui_config, NULL);
+
+	repo_diff_setup(the_repository, &diffopt);
+
+	options = parse_options_concat(range_diff_options, diffopt.parseopts);
+	argc = parse_options(argc, argv, prefix, options,
+			     builtin_range_diff_usage, 0);
+
+	diff_setup_done(&diffopt);
+
+	/* force color when --dual-color was used */
+	if (!simple_color)
+		diffopt.use_color = 1;
+
+	if (argc == 2) {
+		if (!is_range_diff_range(argv[0]))
+			die(_("not a commit range: '%s'"), argv[0]);
+		strbuf_addstr(&range1, argv[0]);
+
+		if (!is_range_diff_range(argv[1]))
+			die(_("not a commit 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);
+	}
+	FREE_AND_NULL(options);
+
+	range_diff_opts.dual_color = simple_color < 1;
+	range_diff_opts.left_only = left_only;
+	range_diff_opts.right_only = right_only;
+	res = show_range_diff(range1.buf, range2.buf, &range_diff_opts);
+
+	strvec_clear(&other_arg);
+	strbuf_release(&range1);
+	strbuf_release(&range2);
+
+	return res;
+}