refs: extract a function ref_resolves_to_object()

It is a nice unit of work and soon will be needed from multiple
locations.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/refs.c b/refs.c
index 03c19be..5d760b4 100644 (file)
--- a/refs.c
+++ b/refs.c
@@ -530,6 +530,22 @@ static void sort_ref_dir(struct ref_dir *dir)
 #define DO_FOR_EACH_INCLUDE_BROKEN 0x01
 
 /*
+ * Return true iff the reference described by entry can be resolved to
+ * an object in the database.  Emit a warning if the referred-to
+ * object does not exist.
+ */
+static int ref_resolves_to_object(struct ref_entry *entry)
+{
+       if (entry->flag & REF_ISBROKEN)
+               return 0;
+       if (!has_sha1_file(entry->u.value.sha1)) {
+               error("%s does not point to a valid object!", entry->name);
+               return 0;
+       }
+       return 1;
+}
+
+/*
  * current_ref is a performance hack: when iterating over references
  * using the for_each_ref*() functions, current_ref is set to the
  * current reference's entry before calling the callback function.  If
@@ -550,14 +566,10 @@ static int do_one_ref(const char *base, each_ref_fn fn, int trim,
        if (prefixcmp(entry->name, base))
                return 0;
 
-       if (!(flags & DO_FOR_EACH_INCLUDE_BROKEN)) {
-               if (entry->flag & REF_ISBROKEN)
-                       return 0; /* ignore broken refs e.g. dangling symref */
-               if (!has_sha1_file(entry->u.value.sha1)) {
-                       error("%s does not point to a valid object!", entry->name);
-                       return 0;
-               }
-       }
+       if (!(flags & DO_FOR_EACH_INCLUDE_BROKEN) &&
+             !ref_resolves_to_object(entry))
+               return 0;
+
        current_ref = entry;
        retval = fn(entry->name + trim, entry->u.value.sha1, entry->flag, cb_data);
        current_ref = NULL;