1 files changed, 120 insertions, 0 deletions
diff --git a/examples/rev-list.c b/examples/rev-list.c
new file mode 100644
index 000000000..d9ec15f76
--- /dev/null
+++ b/examples/rev-list.c
@@ -0,0 +1,120 @@
+#include <stdio.h>
+#include <string.h>
+
+#include <git2.h>
+
+static void check_error(int error_code, const char *action)
+{
+	if (!error_code)
+		return;
+
+	const git_error *error = giterr_last();
+	fprintf(stderr, "Error %d %s: %s\n", -error_code, action,
+	        (error && error->message) ? error->message : "???");
+	exit(1);
+}
+
+static int push_commit(git_revwalk *walk, const git_oid *oid, int hide)
+{
+	if (hide)
+		return git_revwalk_hide(walk, oid);
+	else
+		return git_revwalk_push(walk, oid);
+}
+
+static int push_spec(git_repository *repo, git_revwalk *walk, const char *spec, int hide)
+{
+	int error;
+	git_object *obj;
+
+	if ((error = git_revparse_single(&obj, repo, spec)) < 0)
+		return error;
+
+	error = push_commit(walk, git_object_id(obj), hide);
+	git_object_free(obj);
+	return error;
+}
+
+static int push_range(git_repository *repo, git_revwalk *walk, const char *range, int hide)
+{
+	git_revspec revspec;
+	int error = 0;
+
+	if ((error = git_revparse(&revspec, repo, range)))
+		return error;
+
+	if (revspec.flags & GIT_REVPARSE_MERGE_BASE) {
+		/* TODO: support "<commit>...<commit>" */
+		return GIT_EINVALIDSPEC;
+	}
+
+	if ((error = push_commit(walk, git_object_id(revspec.from), !hide)))
+		goto out;
+
+	error = push_commit(walk, git_object_id(revspec.to), hide);
+
+out:
+	git_object_free(revspec.from);
+	git_object_free(revspec.to);
+	return error;
+}
+
+static int revwalk_parseopts(git_repository *repo, git_revwalk *walk, int nopts, char **opts)
+{
+	int hide, i, error;
+	unsigned int sorting = GIT_SORT_NONE;
+
+	hide = 0;
+	for (i = 0; i < nopts; i++) {
+		if (!strcmp(opts[i], "--topo-order")) {
+			sorting = GIT_SORT_TOPOLOGICAL | (sorting & GIT_SORT_REVERSE);
+			git_revwalk_sorting(walk, sorting);
+		} else if (!strcmp(opts[i], "--date-order")) {
+			sorting = GIT_SORT_TIME | (sorting & GIT_SORT_REVERSE);
+			git_revwalk_sorting(walk, sorting);
+		} else if (!strcmp(opts[i], "--reverse")) {
+			sorting = (sorting & ~GIT_SORT_REVERSE)
+			    | ((sorting & GIT_SORT_REVERSE) ? 0 : GIT_SORT_REVERSE);
+			git_revwalk_sorting(walk, sorting);
+		} else if (!strcmp(opts[i], "--not")) {
+			hide = !hide;
+		} else if (opts[i][0] == '^') {
+			if ((error = push_spec(repo, walk, opts[i] + 1, !hide)))
+				return error;
+		} else if (strstr(opts[i], "..")) {
+			if ((error = push_range(repo, walk, opts[i], hide)))
+				return error;
+		} else {
+			if ((error = push_spec(repo, walk, opts[i], hide)))
+				return error;
+		}
+	}
+
+	return 0;
+}
+
+int main (int argc, char **argv)
+{
+	int error;
+	git_repository *repo;
+	git_revwalk *walk;
+	git_oid oid;
+	char buf[41];
+
+	error = git_repository_open_ext(&repo, ".", 0, NULL);
+	check_error(error, "opening repository");
+
+	error = git_revwalk_new(&walk, repo);
+	check_error(error, "allocating revwalk");
+	error = revwalk_parseopts(repo, walk, argc-1, argv+1);
+	check_error(error, "parsing options");
+
+	while (!git_revwalk_next(&oid, walk)) {
+		git_oid_fmt(buf, &oid);
+		buf[40] = '\0';
+		printf("%s\n", buf);
+	}
+
+	return 0;
+}
+