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diff --git a/builtin-diff.c b/builtin-diff.c
index cb38f445611735cff5bc9fbafb3189e6ccc6c2fd..a6590205e8f746304f3d06d3e328a05bf2bf954e 100644 (file)
--- a/builtin-diff.c
+++ b/builtin-diff.c
@@ -23,7 +23,7 @@ struct blobinfo {
 };
 
 static const char builtin_diff_usage[] =
-"diff <options> <rev>{0,2} -- <path>*";
+"git-diff <options> <rev>{0,2} -- <path>*";
 
 static int builtin_diff_files(struct rev_info *revs,
                              int argc, const char **argv)
@@ -56,13 +56,6 @@ static int builtin_diff_files(struct rev_info *revs,
        if (revs->max_count < 0 &&
            (revs->diffopt.output_format & DIFF_FORMAT_PATCH))
                revs->combine_merges = revs->dense_combined_merges = 1;
-       /*
-        * Backward compatibility wart - "diff-files -s" used to
-        * defeat the common diff option "-s" which asked for
-        * DIFF_FORMAT_NO_OUTPUT.
-        */
-       if (revs->diffopt.output_format == DIFF_FORMAT_NO_OUTPUT)
-               revs->diffopt.output_format = DIFF_FORMAT_RAW;
        return run_diff_files(revs, silent);
 }
 
@@ -75,9 +68,8 @@ static void stuff_change(struct diff_options *opt,
 {
        struct diff_filespec *one, *two;
 
-       if (memcmp(null_sha1, old_sha1, 20) &&
-           memcmp(null_sha1, new_sha1, 20) &&
-           !memcmp(old_sha1, new_sha1, 20))
+       if (!is_null_sha1(old_sha1) && !is_null_sha1(new_sha1) &&
+           !hashcmp(old_sha1, new_sha1))
                return;
 
        if (opt->reverse_diff) {
@@ -125,9 +117,6 @@ static int builtin_diff_blobs(struct rev_info *revs,
                              int argc, const char **argv,
                              struct blobinfo *blob)
 {
-       /* Blobs: the arguments are reversed when setup_revisions()
-        * picked them up.
-        */
        unsigned mode = canon_mode(S_IFREG | 0644);
 
        if (argc > 1)
@@ -135,8 +124,8 @@ static int builtin_diff_blobs(struct rev_info *revs,
 
        stuff_change(&revs->diffopt,
                     mode, mode,
-                    blob[1].sha1, blob[0].sha1,
-                    blob[0].name, blob[0].name);
+                    blob[0].sha1, blob[1].sha1,
+                    blob[0].name, blob[1].name);
        diffcore_std(&revs->diffopt);
        diff_flush(&revs->diffopt);
        return 0;
@@ -203,7 +192,7 @@ static int builtin_diff_combined(struct rev_info *revs,
        parent = xmalloc(ents * sizeof(*parent));
        /* Again, the revs are all reverse */
        for (i = 0; i < ents; i++)
-               memcpy(parent + i, ent[ents - 1 - i].item->sha1, 20);
+               hashcpy((unsigned char*)parent + i, ent[ents - 1 - i].item->sha1);
        diff_tree_combined(parent[0], parent + 1, ents - 1,
                           revs->dense_combined_merges, revs);
        return 0;
@@ -221,7 +210,7 @@ void add_head(struct rev_info *revs)
        add_pending_object(revs, obj, "HEAD");
 }
 
-int cmd_diff(int argc, const char **argv, char **envp)
+int cmd_diff(int argc, const char **argv, const char *prefix)
 {
        int i;
        struct rev_info rev;
@@ -251,12 +240,13 @@ int cmd_diff(int argc, const char **argv, char **envp)
         */
 
        git_config(git_diff_ui_config);
-       init_revisions(&rev);
+       init_revisions(&rev, prefix);
 
        argc = setup_revisions(argc, argv, &rev, NULL);
        if (!rev.diffopt.output_format) {
                rev.diffopt.output_format = DIFF_FORMAT_PATCH;
-               diff_setup_done(&rev.diffopt);
+               if (diff_setup_done(&rev.diffopt) < 0)
+                       die("diff_setup_done failed");
        }
 
        /* Do we have --cached and not have a pending object, then
@@ -300,7 +290,7 @@ int cmd_diff(int argc, const char **argv, char **envp)
                if (obj->type == OBJ_BLOB) {
                        if (2 <= blobs)
                                die("more than two blobs given: '%s'", name);
-                       memcpy(blob[blobs].sha1, obj->sha1, 20);
+                       hashcpy(blob[blobs].sha1, obj->sha1);
                        blob[blobs].name = name;
                        blobs++;
                        continue;
@@ -346,7 +336,16 @@ int cmd_diff(int argc, const char **argv, char **envp)
                return builtin_diff_index(&rev, argc, argv);
        else if (ents == 2)
                return builtin_diff_tree(&rev, argc, argv, ent);
+       else if ((ents == 3) && (ent[0].item->flags & UNINTERESTING)) {
+               /* diff A...B where there is one sane merge base between
+                * A and B.  We have ent[0] == merge-base, ent[1] == A,
+                * and ent[2] == B.  Show diff between the base and B.
+                */
+               ent[1] = ent[2];
+               return builtin_diff_tree(&rev, argc, argv, ent);
+       }
        else
-               return builtin_diff_combined(&rev, argc, argv, ent, ents);
+               return builtin_diff_combined(&rev, argc, argv,
+                                            ent, ents);
        usage(builtin_diff_usage);
 }