[PATCH v2 01/10] ref-filter: add %(refname:shortalign=X) option

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

Add support for %(refname:shortalign=X) where X is a number.
This will print a shortened refname aligned to the left
followed by spaces for a total length of X characters.
If X is less than the shortened refname size, the entire
shortened refname is printed.

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 | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/ref-filter.c b/ref-filter.c
index dd0709d..3098497 100644
--- a/ref-filter.c
+++ b/ref-filter.c
@@ -10,6 +10,7 @@
 #include "quote.h"
 #include "ref-filter.h"
 #include "revision.h"
+#include "utf8.h"
 
 typedef enum { FIELD_STR, FIELD_ULONG, FIELD_TIME } cmp_type;
 
@@ -695,7 +696,23 @@ static void populate_value(struct ref_array_item *ref)
 			int num_ours, num_theirs;
 
 			formatp++;
-			if (!strcmp(formatp, "short"))
+			if (starts_with(formatp, "shortalign=")) {
+				const char *valp, *short_refname = NULL;
+				int val, len;
+
+				skip_prefix(formatp, "shortalign=", &valp);
+				val = atoi(valp);
+				refname = short_refname = shorten_unambiguous_ref(refname,
+										  warn_ambiguous_refs);
+				len = utf8_strwidth(refname);
+				if (val > len) {
+					struct strbuf buf = STRBUF_INIT;
+					strbuf_addstr(&buf, refname);
+					strbuf_addchars(&buf, ' ', val - len);
+					free((char *)short_refname);
+					refname = strbuf_detach(&buf, NULL);
+				}
+			} else if (!strcmp(formatp, "short"))
 				refname = shorten_unambiguous_ref(refname,
 						      warn_ambiguous_refs);
 			else if (!strcmp(formatp, "track") &&
-- 
2.4.5