match-trees: factor out fill_tree_desc_strict

Deduplicate code by moving tree_desc initialization into a helper
function, fill_tree_desc_strict.  It is like fill_tree_descriptor,
except that it only accepts tree hashes and no tree references (tags,
commits).  No functional change.

Signed-off-by: René Scharfe <rene.scharfe@lsrfire.ath.cx>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/match-trees.c b/match-trees.c
index 2bb734d51cbe59e3eed7c82e7522c594d5efa579..7873cdec581eea66feab06c22b83ef7c27c7c5b6 100644 (file)
--- a/match-trees.c
+++ b/match-trees.c
@@ -47,6 +47,22 @@ static int score_matches(unsigned mode1, unsigned mode2, const char *path)
        return score;
 }
 
+static void *fill_tree_desc_strict(struct tree_desc *desc,
+                                  const unsigned char *hash)
+{
+       void *buffer;
+       enum object_type type;
+       unsigned long size;
+
+       buffer = read_sha1_file(hash, &type, &size);
+       if (!buffer)
+               die("unable to read tree (%s)", sha1_to_hex(hash));
+       if (type != OBJ_TREE)
+               die("%s is not a tree", sha1_to_hex(hash));
+       init_tree_desc(desc, buffer, size);
+       return buffer;
+}
+
 static int base_name_entries_compare(const struct name_entry *a,
                                     const struct name_entry *b)
 {
@@ -61,23 +77,10 @@ static int score_trees(const unsigned char *hash1, const unsigned char *hash2)
 {
        struct tree_desc one;
        struct tree_desc two;
-       void *one_buf, *two_buf;
+       void *one_buf = fill_tree_desc_strict(&one, hash1);
+       void *two_buf = fill_tree_desc_strict(&two, hash2);
        int score = 0;
-       enum object_type type;
-       unsigned long size;
 
-       one_buf = read_sha1_file(hash1, &type, &size);
-       if (!one_buf)
-               die("unable to read tree (%s)", sha1_to_hex(hash1));
-       if (type != OBJ_TREE)
-               die("%s is not a tree", sha1_to_hex(hash1));
-       init_tree_desc(&one, one_buf, size);
-       two_buf = read_sha1_file(hash2, &type, &size);
-       if (!two_buf)
-               die("unable to read tree (%s)", sha1_to_hex(hash2));
-       if (type != OBJ_TREE)
-               die("%s is not a tree", sha1_to_hex(hash2));
-       init_tree_desc(&two, two_buf, size);
        for (;;) {
                struct name_entry e1, e2;
                int got_entry_from_one = tree_entry(&one, &e1);
@@ -124,16 +127,7 @@ static void match_trees(const unsigned char *hash1,
                        int recurse_limit)
 {
        struct tree_desc one;
-       void *one_buf;
-       enum object_type type;
-       unsigned long size;
-
-       one_buf = read_sha1_file(hash1, &type, &size);
-       if (!one_buf)
-               die("unable to read tree (%s)", sha1_to_hex(hash1));
-       if (type != OBJ_TREE)
-               die("%s is not a tree", sha1_to_hex(hash1));
-       init_tree_desc(&one, one_buf, size);
+       void *one_buf = fill_tree_desc_strict(&one, hash1);
 
        while (one.size) {
                const char *path;