1 files changed, 21 insertions, 0 deletions
diff --git a/parse-options.c b/parse-options.c
index c751ebf601..12a9f9ea68 100644
--- a/parse-options.c
+++ b/parse-options.c
@@ -254,3 +254,24 @@ void usage_with_options(const char * const *usagestr,
 
 	exit(129);
 }
+
+/*----- some often used options -----*/
+#include "cache.h"
+int parse_opt_abbrev_cb(const struct option *opt, const char *arg, int unset)
+{
+	int v;
+
+	if (!arg) {
+		v = unset ? 0 : DEFAULT_ABBREV;
+	} else {
+		v = strtol(arg, (char **)&arg, 10);
+		if (*arg)
+			return opterror(opt, "expects a numerical value", 0);
+		if (v && v < MINIMUM_ABBREV)
+			v = MINIMUM_ABBREV;
+		else if (v > 40)
+			v = 40;
+	}
+	*(int *)(opt->value) = v;
+	return 0;
+}