Use Git's internal diff_tree_sha1() function for the /rawdiff/ command
instead of trying to recreate this functionality.

Signed-off-by: Lukas Fleischer <[email protected]>
---
The test suite still passes. If anybody has any idea how to do this
better: Comments welcome.

 ui-diff.c | 28 +++++++++++++++++++++++++---
 1 file changed, 25 insertions(+), 3 deletions(-)

diff --git a/ui-diff.c b/ui-diff.c
index 1209c47..c602494 100644
--- a/ui-diff.c
+++ b/ui-diff.c
@@ -360,7 +360,7 @@ void cgit_print_diff_ctrls()
 void cgit_print_diff(const char *new_rev, const char *old_rev,
                     const char *prefix, int show_ctrls, int raw)
 {
-       struct commit *commit, *commit2;
+       struct commit *commit, *commit2 = NULL;
 
        if (!new_rev)
                new_rev = ctx.qry.head;
@@ -394,10 +394,32 @@ void cgit_print_diff(const char *new_rev, const char 
*old_rev,
        }
 
        if (raw) {
+               unsigned char old_tree_sha1[20], new_tree_sha1[20];
+               struct diff_options diffopt;
+
+               memcpy(new_tree_sha1, commit->tree->object.sha1, 20);
+               if (commit2) {
+                       memcpy(old_tree_sha1, commit2->tree->object.sha1, 20);
+               } else {
+                       /*
+                        * SHA-1 of an empty tree. We might be better off not
+                        * hardcoding this.
+                        */
+                       get_sha1("4b825dc642cb6eb9a060e54bf8d69288fbee4904",
+                                old_tree_sha1);
+               }
+
+               diff_setup(&diffopt);
+               diffopt.output_format = DIFF_FORMAT_PATCH;
+               DIFF_OPT_SET(&diffopt, RECURSIVE);
+               diff_setup_done(&diffopt);
+
                ctx.page.mimetype = "text/plain";
                cgit_print_http_headers(&ctx);
-               cgit_diff_tree(old_rev_sha1, new_rev_sha1, filepair_cb_raw,
-                              prefix, 0);
+               diff_tree_sha1(old_tree_sha1, new_tree_sha1, "", &diffopt);
+               diffcore_std(&diffopt);
+               diff_flush(&diffopt);
+
                return;
        }
 
-- 
1.8.4.rc3.500.gc3113b0

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