git-merge-tree: generalize the "traverse <n> trees in sync" functionality

diff --git a/diff-index.c b/diff-index.c
index 87e10619830ba71654240d424f15cb6db8ac1d65..f8a102ec1665753e078798eaaac7aca48b845995 100644 (file)
--- a/diff-index.c
+++ b/diff-index.c
@@ -1,4 +1,5 @@
 #include "cache.h"
+#include "tree.h"
 #include "diff.h"
 
 static int cached_only = 0;
@@ -174,8 +175,7 @@ int main(int argc, const char **argv)
        unsigned char sha1[20];
        const char *prefix = setup_git_directory();
        const char **pathspec = NULL;
-       void *tree;
-       unsigned long size;
+       struct tree *tree;
        int ret;
        int allow_options = 1;
        int i;
@@ -201,6 +201,14 @@ int main(int argc, const char **argv)
                        /* We accept the -r flag just to look like git-diff-tree */
                        continue;
                }
+               if (!strcmp(arg, "--cc"))
+                       /*
+                        * I _think_ "diff-index --cached HEAD" with an
+                        * unmerged index could show something else
+                        * later, but pretend --cc is the same as -p for
+                        * now.  "git diff" uses --cc by default.
+                        */
+                       argv[i] = arg = "-p";
                diff_opt_cnt = diff_opt_parse(&diff_options, argv + i,
                                              argc - i);
                if (diff_opt_cnt < 0)
@@ -233,10 +241,10 @@ int main(int argc, const char **argv)
 
        mark_merge_entries();
 
-       tree = read_object_with_reference(sha1, "tree", &size, NULL);
+       tree = parse_tree_indirect(sha1);
        if (!tree)
                die("bad tree object %s", tree_name);
-       if (read_tree(tree, size, 1, pathspec))
+       if (read_tree(tree, 1, pathspec))
                die("unable to read tree object %s", tree_name);
 
        ret = diff_cache(active_cache, active_nr, pathspec);