1 files changed, 92 insertions, 0 deletions
diff --git a/list-objects-filter-options.c b/list-objects-filter-options.c
new file mode 100644
index 0000000..4c5b34e
--- /dev/null
+++ b/list-objects-filter-options.c
@@ -0,0 +1,92 @@
+#include "cache.h"
+#include "commit.h"
+#include "config.h"
+#include "revision.h"
+#include "argv-array.h"
+#include "list-objects.h"
+#include "list-objects-filter.h"
+#include "list-objects-filter-options.h"
+
+/*
+ * Parse value of the argument to the "filter" keyword.
+ * On the command line this looks like:
+ *       --filter=<arg>
+ * and in the pack protocol as:
+ *       "filter" SP <arg>
+ *
+ * The filter keyword will be used by many commands.
+ * See Documentation/rev-list-options.txt for allowed values for <arg>.
+ *
+ * Capture the given arg as the "filter_spec".  This can be forwarded to
+ * subordinate commands when necessary.  We also "intern" the arg for
+ * the convenience of the current command.
+ */
+int parse_list_objects_filter(struct list_objects_filter_options *filter_options,
+			      const char *arg)
+{
+	const char *v0;
+
+	if (filter_options->choice)
+		die(_("multiple object filter types cannot be combined"));
+
+	filter_options->filter_spec = strdup(arg);
+
+	if (!strcmp(arg, "blob:none")) {
+		filter_options->choice = LOFC_BLOB_NONE;
+		return 0;
+	}
+
+	if (skip_prefix(arg, "blob:limit=", &v0)) {
+		if (!git_parse_ulong(v0, &filter_options->blob_limit_value))
+			die(_("invalid filter-spec expression '%s'"), arg);
+		filter_options->choice = LOFC_BLOB_LIMIT;
+		return 0;
+	}
+
+	if (skip_prefix(arg, "sparse:oid=", &v0)) {
+		struct object_context oc;
+		struct object_id sparse_oid;
+
+		/*
+		 * Try to parse <oid-expression> into an OID for the current
+		 * command, but DO NOT complain if we don't have the blob or
+		 * ref locally.
+		 */
+		if (!get_oid_with_context(v0, GET_OID_BLOB,
+					  &sparse_oid, &oc))
+			filter_options->sparse_oid_value = oiddup(&sparse_oid);
+		filter_options->choice = LOFC_SPARSE_OID;
+		return 0;
+	}
+
+	if (skip_prefix(arg, "sparse:path=", &v0)) {
+		filter_options->choice = LOFC_SPARSE_PATH;
+		filter_options->sparse_path_value = strdup(v0);
+		return 0;
+	}
+
+	die(_("invalid filter-spec expression '%s'"), arg);
+	return 0;
+}
+
+int opt_parse_list_objects_filter(const struct option *opt,
+				  const char *arg, int unset)
+{
+	struct list_objects_filter_options *filter_options = opt->value;
+
+	if (unset || !arg) {
+		list_objects_filter_release(filter_options);
+		return 0;
+	}
+
+	return parse_list_objects_filter(filter_options, arg);
+}
+
+void list_objects_filter_release(
+	struct list_objects_filter_options *filter_options)
+{
+	free(filter_options->filter_spec);
+	free(filter_options->sparse_oid_value);
+	free(filter_options->sparse_path_value);
+	memset(filter_options, 0, sizeof(*filter_options));
+}