t/helper: 'test-chmtime (--get|-g)' to print only the mtime

Compared to 'test-chmtime -v +0 file' which prints the mtime and
and the file name, 'test-chmtime --get file' displays only the mtime.
If it is used in combination with (+|=|=+|=-|-)seconds, it changes
and prints the new value.

	test-chmtime -v +0 file | sed 's/[^0-9].*$//'

is now equivalent to:

	test-chmtime --get file

Signed-off-by: Paul-Sebastian Ungureanu <ungureanupaulsebastian@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 36 insertions, 8 deletions

diff --git a/t/helper/test-chmtime.c b/t/helper/test-chmtime.c
index e760256..611e952 100644
--- a/t/helper/test-chmtime.c
+++ b/t/helper/test-chmtime.c
@@ -18,19 +18,29 @@
  *
  * Examples:
  *
- * To just print the mtime use --verbose and set the file mtime offset to 0:
+ * To print the mtime and the file name use --verbose and set
+ * the file mtime offset to 0:
  *
  *	test-chmtime -v +0 file
  *
+ * To print only the mtime use --get:
+ *
+ *	test-chmtime --get file
+ *
  * To set the mtime to current time:
  *
  *	test-chmtime =+0 file
  *
+ * To set the file mtime offset to +1 and print the new value:
+ *
+ *	test-chmtime --get +1 file
+ *
  */
 #include "git-compat-util.h"
 #include <utime.h>
 
-static const char usage_str[] = "-v|--verbose (+|=|=+|=-|-)<seconds> <file>...";
+static const char usage_str[] =
+	"(-v|--verbose|-g|--get) (+|=|=+|=-|-)<seconds> <file>...";
 
 static int timespec_arg(const char *arg, long int *set_time, int *set_eq)
 {
@@ -46,7 +56,6 @@ static int timespec_arg(const char *arg, long int *set_time, int *set_eq)
 	}
 	*set_time = strtol(timespec, &test, 10);
 	if (*test) {
-		fprintf(stderr, "Not a base-10 integer: %s\n", arg + 1);
 		return 0;
 	}
 	if ((*set_eq && *set_time < 0) || *set_eq == 2) {
@@ -59,6 +68,7 @@ static int timespec_arg(const char *arg, long int *set_time, int *set_eq)
 int cmd_main(int argc, const char **argv)
 {
 	static int verbose;
+	static int get;
 
 	int i = 1;
 	/* no mtime change by default */
@@ -68,18 +78,34 @@ int cmd_main(int argc, const char **argv)
 	if (argc < 3)
 		goto usage;
 
-	if (strcmp(argv[i], "--verbose") == 0 || strcmp(argv[i], "-v") == 0) {
+	if (strcmp(argv[i], "--get") == 0 || strcmp(argv[i], "-g") == 0) {
+		get = 1;
+		++i;
+	} else if (strcmp(argv[i], "--verbose") == 0 || strcmp(argv[i], "-v") == 0) {
 		verbose = 1;
 		++i;
 	}
-	if (timespec_arg(argv[i], &set_time, &set_eq))
+
+	if (i == argc) {
+		goto usage;
+	}
+
+	if (timespec_arg(argv[i], &set_time, &set_eq)) {
 		++i;
-	else
+	} else {
+		if (get == 0) {
+			fprintf(stderr, "Not a base-10 integer: %s\n", argv[i] + 1);
+			goto usage;
+		}
+	}
+
+	if (i == argc)
 		goto usage;
 
 	for (; i < argc; i++) {
 		struct stat sb;
 		struct utimbuf utb;
+		uintmax_t mtime;
 
 		if (stat(argv[i], &sb) < 0) {
 			fprintf(stderr, "Failed to stat %s: %s\n",
@@ -99,8 +125,10 @@ int cmd_main(int argc, const char **argv)
 		utb.actime = sb.st_atime;
 		utb.modtime = set_eq ? set_time : sb.st_mtime + set_time;
 
-		if (verbose) {
-			uintmax_t mtime = utb.modtime < 0 ? 0: utb.modtime;
+		mtime = utb.modtime < 0 ? 0: utb.modtime;
+		if (get) {
+			printf("%"PRIuMAX"\n", mtime);
+		} else if (verbose) {
 			printf("%"PRIuMAX"\t%s\n", mtime, argv[i]);
 		}