[PATCH RFC v2 4/4] ref-filter: add deltabase formatting option

[Olga Telezhnaya]

Add %(deltabase) support. It is still not working for deref:
I am thinking how to support it in a more elegant way.

Signed-off-by: Olga Telezhnaia <olyatelezhn...@gmail.com>
---
 ref-filter.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/ref-filter.c b/ref-filter.c
index c00de58455301..989ccdb356a32 100644
--- a/ref-filter.c
+++ b/ref-filter.c
@@ -276,6 +276,14 @@ static int objecttype_atom_parser(const struct ref_format 
*format, struct used_a
        return 0;
 }
 
+static int deltabase_atom_parser(const struct ref_format *format, struct 
used_atom *atom,
+                                 const char *arg, struct strbuf *unused_err)
+{
+       oi_data.use_data = 1;
+       oi_data.info.delta_base_sha1 = oi_data.delta_base_oid.hash;
+       return 0;
+}
+
 static int objectsize_atom_parser(const struct ref_format *format, struct 
used_atom *atom,
                                  const char *arg, struct strbuf *err)
 {
@@ -409,6 +417,7 @@ static struct {
        { "objecttype", FIELD_STR, objecttype_atom_parser },
        { "objectsize", FIELD_ULONG, objectsize_atom_parser },
        { "objectname", FIELD_STR, objectname_atom_parser },
+       { "deltabase", FIELD_STR, deltabase_atom_parser },
        { "tree" },
        { "parent" },
        { "numparent", FIELD_ULONG },
@@ -1572,6 +1581,9 @@ static int populate_value(struct ref_array_item *ref, 
struct strbuf *err)
                                v->s = xstrfmt("%lu", oi_data.disk_size);
                        }
                        continue;
+               } else if (!deref && !strcmp(name, "deltabase") && 
oi_data.use_data) {
+                       v->s = xstrdup(oid_to_hex(&oi_data.delta_base_oid));
+                       continue;
                } else if (!strcmp(name, "HEAD")) {
                        if (atom->u.head && !strcmp(ref->refname, atom->u.head))
                                v->s = "*";

--
https://github.com/git/git/pull/493