commit-graph: add format document

diff --git a/match-trees.c b/match-trees.c
index 396b7338df2c53009900fbd3df36dd06a7219493..0ca99d51626f49b5d4a88b9edc43c533c970dd0e 100644 (file)
--- a/match-trees.c
+++ b/match-trees.c
@@ -158,22 +158,20 @@ static void match_trees(const struct object_id *hash1,
 }
 
 /*
- * A tree "hash1" has a subdirectory at "prefix".  Come up with a
- * tree object by replacing it with another tree "hash2".
+ * A tree "oid1" has a subdirectory at "prefix".  Come up with a tree object by
+ * replacing it with another tree "oid2".
  */
-static int splice_tree(const unsigned char *hash1,
-                      const char *prefix,
-                      const unsigned char *hash2,
-                      unsigned char *result)
+static int splice_tree(const struct object_id *oid1, const char *prefix,
+                      const struct object_id *oid2, struct object_id *result)
 {
        char *subpath;
        int toplen;
        char *buf;
        unsigned long sz;
        struct tree_desc desc;
-       unsigned char *rewrite_here;
-       const unsigned char *rewrite_with;
-       unsigned char subtree[20];
+       struct object_id *rewrite_here;
+       const struct object_id *rewrite_with;
+       struct object_id subtree;
        enum object_type type;
        int status;
 
@@ -182,9 +180,9 @@ static int splice_tree(const unsigned char *hash1,
        if (*subpath)
                subpath++;
 
-       buf = read_sha1_file(hash1, &type, &sz);
+       buf = read_sha1_file(oid1->hash, &type, &sz);
        if (!buf)
-               die("cannot read tree %s", sha1_to_hex(hash1));
+               die("cannot read tree %s", oid_to_hex(oid1));
        init_tree_desc(&desc, buf, sz);
 
        rewrite_here = NULL;
@@ -197,26 +195,26 @@ static int splice_tree(const unsigned char *hash1,
                if (strlen(name) == toplen &&
                    !memcmp(name, prefix, toplen)) {
                        if (!S_ISDIR(mode))
-                               die("entry %s in tree %s is not a tree",
-                                   name, sha1_to_hex(hash1));
-                       rewrite_here = (unsigned char *) oid->hash;
+                               die("entry %s in tree %s is not a tree", name,
+                                   oid_to_hex(oid1));
+                       rewrite_here = (struct object_id *)oid;
                        break;
                }
                update_tree_entry(&desc);
        }
        if (!rewrite_here)
-               die("entry %.*s not found in tree %s",
-                   toplen, prefix, sha1_to_hex(hash1));
+               die("entry %.*s not found in tree %s", toplen, prefix,
+                   oid_to_hex(oid1));
        if (*subpath) {
-               status = splice_tree(rewrite_here, subpath, hash2, subtree);
+               status = splice_tree(rewrite_here, subpath, oid2, &subtree);
                if (status)
                        return status;
-               rewrite_with = subtree;
+               rewrite_with = &subtree;
+       } else {
+               rewrite_with = oid2;
        }
-       else
-               rewrite_with = hash2;
-       hashcpy(rewrite_here, rewrite_with);
-       status = write_sha1_file(buf, sz, tree_type, result);
+       oidcpy(rewrite_here, rewrite_with);
+       status = write_object_file(buf, sz, tree_type, result);
        free(buf);
        return status;
 }
@@ -280,7 +278,7 @@ void shift_tree(const struct object_id *hash1,
        if (!*add_prefix)
                return;
 
-       splice_tree(hash1->hash, add_prefix, hash2->hash, shifted->hash);
+       splice_tree(hash1, add_prefix, hash2, shifted);
 }
 
 /*
@@ -334,7 +332,7 @@ void shift_tree_by(const struct object_id *hash1,
                 * shift tree2 down by adding shift_prefix above it
                 * to match tree1.
                 */
-               splice_tree(hash1->hash, shift_prefix, hash2->hash, shifted->hash);
+               splice_tree(hash1, shift_prefix, hash2, shifted);
        else
                /*
                 * shift tree2 up by removing shift_prefix from it