Merge branch 'jc/maint-1.6.6-pathspec-stdin-and-cmdline'

[git.git] / builtin / diff.c

diff --git a/builtin/diff.c b/builtin/diff.c
index ffcdd055ca0b9b30bec2ce1f22e348ec15d58c81..4c9deb28ec15d0c2adae795cc2c177b24256e585 100644 (file)
--- a/builtin/diff.c
+++ b/builtin/diff.c
@@ -13,6 +13,7 @@
 #include "revision.h"
 #include "log-tree.h"
 #include "builtin.h"
+#include "submodule.h"
 
 struct blobinfo {
        unsigned char sha1[20];
@@ -21,7 +22,7 @@ struct blobinfo {
 };
 
 static const char builtin_diff_usage[] =
-"git diff <options> <rev>{0,2} -- <path>*";
+"git diff [<options>] [<commit> [<commit>]] [--] [<path>...]";
 
 static void stuff_change(struct diff_options *opt,
                         unsigned old_mode, unsigned new_mode,
@@ -134,7 +135,7 @@ static int builtin_diff_index(struct rev_info *revs,
            revs->max_count != -1 || revs->min_age != -1 ||
            revs->max_age != -1)
                usage(builtin_diff_usage);
-       if (read_cache_preload(revs->diffopt.paths) < 0) {
+       if (read_cache_preload(revs->diffopt.pathspec.raw) < 0) {
                perror("read_cache_preload");
                return -1;
        }
@@ -236,7 +237,7 @@ static int builtin_diff_files(struct rev_info *revs, int argc, const char **argv
                revs->combine_merges = revs->dense_combined_merges = 1;
 
        setup_work_tree();
-       if (read_cache_preload(revs->diffopt.paths) < 0) {
+       if (read_cache_preload(revs->diffopt.pathspec.raw) < 0) {
                perror("read_cache_preload");
                return -1;
        }
@@ -279,6 +280,7 @@ int cmd_diff(int argc, const char **argv, const char *prefix)
         */
 
        prefix = setup_git_directory_gently(&nongit);
+       gitmodules_config();
        git_config(git_diff_ui_config, NULL);
 
        if (diff_use_color_default == -1)
@@ -328,8 +330,11 @@ int cmd_diff(int argc, const char **argv, const char *prefix)
                        else if (!strcmp(arg, "--cached") ||
                                 !strcmp(arg, "--staged")) {
                                add_head_to_pending(&rev);
-                               if (!rev.pending.nr)
-                                       die("No HEAD commit to compare with (yet)");
+                               if (!rev.pending.nr) {
+                                       struct tree *tree;
+                                       tree = lookup_tree((const unsigned char*)EMPTY_TREE_SHA1_BIN);
+                                       add_pending_object(&rev, &tree->object, "HEAD");
+                               }
                                break;
                        }
                }
@@ -369,14 +374,10 @@ int cmd_diff(int argc, const char **argv, const char *prefix)
                }
                die("unhandled object '%s' given.", name);
        }
-       if (rev.prune_data) {
-               const char **pathspec = rev.prune_data;
-               while (*pathspec) {
-                       if (!path)
-                               path = *pathspec;
-                       paths++;
-                       pathspec++;
-               }
+       if (rev.prune_data.nr) {
+               if (!path)
+                       path = rev.prune_data.items[0].match;
+               paths += rev.prune_data.nr;
        }
 
        /*
@@ -407,17 +408,19 @@ int cmd_diff(int argc, const char **argv, const char *prefix)
                result = builtin_diff_index(&rev, argc, argv);
        else if (ents == 2)
                result = 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.
+       else if (ent[0].item->flags & UNINTERESTING) {
+               /*
+                * diff A...B where there is at least one merge base
+                * between A and B.  We have ent[0] == merge-base,
+                * ent[ents-2] == A, and ent[ents-1] == B.  Show diff
+                * between the base and B.  Note that we pick one
+                * merge base at random if there are more than one.
                 */
-               ent[1] = ent[2];
+               ent[1] = ent[ents-1];
                result = builtin_diff_tree(&rev, argc, argv, ent);
-       }
-       else
+       } else
                result = builtin_diff_combined(&rev, argc, argv,
-                                            ent, ents);
+                                              ent, ents);
        result = diff_result_code(&rev.diffopt, result);
        if (1 < rev.diffopt.skip_stat_unmatch)
                refresh_index_quietly();