1 files changed, 123 insertions, 0 deletions
diff --git a/builtin-check-attr.c b/builtin-check-attr.c
new file mode 100644
index 0000000000..3016d29caa
--- /dev/null
+++ b/builtin-check-attr.c
@@ -0,0 +1,123 @@
+#include "builtin.h"
+#include "cache.h"
+#include "attr.h"
+#include "quote.h"
+#include "parse-options.h"
+
+static int stdin_paths;
+static const char * const check_attr_usage[] = {
+"git check-attr attr... [--] pathname...",
+"git check-attr --stdin attr... < <list-of-paths>",
+NULL
+};
+
+static int null_term_line;
+
+static const struct option check_attr_options[] = {
+	OPT_BOOLEAN(0 , "stdin", &stdin_paths, "read file names from stdin"),
+	OPT_BOOLEAN('z', NULL, &null_term_line,
+		"input paths are terminated by a null character"),
+	OPT_END()
+};
+
+static void check_attr(int cnt, struct git_attr_check *check,
+	const char** name, const char *file)
+{
+	int j;
+	if (git_checkattr(file, cnt, check))
+		die("git_checkattr died");
+	for (j = 0; j < cnt; j++) {
+		const char *value = check[j].value;
+
+		if (ATTR_TRUE(value))
+			value = "set";
+		else if (ATTR_FALSE(value))
+			value = "unset";
+		else if (ATTR_UNSET(value))
+			value = "unspecified";
+
+		quote_c_style(file, NULL, stdout, 0);
+		printf(": %s: %s\n", name[j], value);
+	}
+}
+
+static void check_attr_stdin_paths(int cnt, struct git_attr_check *check,
+	const char** name)
+{
+	struct strbuf buf, nbuf;
+	int line_termination = null_term_line ? 0 : '\n';
+
+	strbuf_init(&buf, 0);
+	strbuf_init(&nbuf, 0);
+	while (strbuf_getline(&buf, stdin, line_termination) != EOF) {
+		if (line_termination && buf.buf[0] == '"') {
+			strbuf_reset(&nbuf);
+			if (unquote_c_style(&nbuf, buf.buf, NULL))
+				die("line is badly quoted");
+			strbuf_swap(&buf, &nbuf);
+		}
+		check_attr(cnt, check, name, buf.buf);
+		maybe_flush_or_die(stdout, "attribute to stdout");
+	}
+	strbuf_release(&buf);
+	strbuf_release(&nbuf);
+}
+
+int cmd_check_attr(int argc, const char **argv, const char *prefix)
+{
+	struct git_attr_check *check;
+	int cnt, i, doubledash;
+	const char *errstr = NULL;
+
+	argc = parse_options(argc, argv, prefix, check_attr_options,
+			     check_attr_usage, PARSE_OPT_KEEP_DASHDASH);
+	if (!argc)
+		usage_with_options(check_attr_usage, check_attr_options);
+
+	if (read_cache() < 0) {
+		die("invalid cache");
+	}
+
+	doubledash = -1;
+	for (i = 0; doubledash < 0 && i < argc; i++) {
+		if (!strcmp(argv[i], "--"))
+			doubledash = i;
+	}
+
+	/* If there is no double dash, we handle only one attribute */
+	if (doubledash < 0) {
+		cnt = 1;
+		doubledash = 0;
+	} else
+		cnt = doubledash;
+	doubledash++;
+
+	if (cnt <= 0)
+		errstr = "No attribute specified";
+	else if (stdin_paths && doubledash < argc)
+		errstr = "Can't specify files with --stdin";
+	if (errstr) {
+		error("%s", errstr);
+		usage_with_options(check_attr_usage, check_attr_options);
+	}
+
+	check = xcalloc(cnt, sizeof(*check));
+	for (i = 0; i < cnt; i++) {
+		const char *name;
+		struct git_attr *a;
+		name = argv[i];
+		a = git_attr(name);
+		if (!a)
+			return error("%s: not a valid attribute name", name);
+		check[i].attr = a;
+	}
+
+	if (stdin_paths)
+		check_attr_stdin_paths(cnt, check, argv);
+	else {
+		for (i = doubledash; i < argc; i++)
+			check_attr(cnt, check, argv, argv[i]);
+		maybe_flush_or_die(stdout, "attribute to stdout");
+	}
+	return 0;
+}