[RFC/PATCH 01/11] ref-filter: add "%(objectname:size=X)" option

[Karthik Nayak <karthik.188@gmail.com>]

From: Karthik Nayak <karthik.188@gmail.com>

Add support for %(objectname:size=X) where X is a number.
This will print the first X characters of an objectname.
The minimum value for X is 5. Hence any value lesser than
5 will default to 5 characters.

Mentored-by: Christian Couder <christian.couder@gmail.com>
Mentored-by: Matthieu Moy <matthieu.moy@grenoble-inp.fr>
Signed-off-by: Karthik Nayak <karthik.188@gmail.com>
---
 ref-filter.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/ref-filter.c b/ref-filter.c
index 0a34924..4c5e3f8 100644
--- a/ref-filter.c
+++ b/ref-filter.c
@@ -196,6 +196,8 @@ static void *get_obj(const unsigned char *sha1, struct object **obj, unsigned lo
 static int grab_objectname(const char *name, const unsigned char *sha1,
 			    struct atom_value *v)
 {
+	const char *p;
+
 	if (!strcmp(name, "objectname")) {
 		char *s = xmalloc(41);
 		strcpy(s, sha1_to_hex(sha1));
@@ -206,6 +208,13 @@ static int grab_objectname(const char *name, const unsigned char *sha1,
 		v->s = xstrdup(find_unique_abbrev(sha1, DEFAULT_ABBREV));
 		return 1;
 	}
+	if (skip_prefix(name, "objectname:size=", &p)) {
+		unsigned int size = atoi(p);
+		if (size < 5)
+			size = 5;
+		v->s = xstrdup(find_unique_abbrev(sha1, size));
+		return 1;
+	}
 	return 0;
 }
 
-- 
2.4.6