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-rw-r--r--builtin/diff-tree.c236
1 files changed, 236 insertions, 0 deletions
diff --git a/builtin/diff-tree.c b/builtin/diff-tree.c
new file mode 100644
index 0000000..86be634
--- /dev/null
+++ b/builtin/diff-tree.c
@@ -0,0 +1,236 @@
+#define USE_THE_INDEX_VARIABLE
+#include "builtin.h"
+#include "config.h"
+#include "diff.h"
+#include "commit.h"
+#include "gettext.h"
+#include "hex.h"
+#include "log-tree.h"
+#include "submodule.h"
+#include "read-cache-ll.h"
+#include "repository.h"
+#include "revision.h"
+#include "tree.h"
+
+static struct rev_info log_tree_opt;
+
+static int diff_tree_commit_oid(const struct object_id *oid)
+{
+ struct commit *commit = lookup_commit_reference(the_repository, oid);
+ if (!commit)
+ return -1;
+ return log_tree_commit(&log_tree_opt, commit);
+}
+
+/* Diff one or more commits. */
+static int stdin_diff_commit(struct commit *commit, const char *p)
+{
+ struct object_id oid;
+ struct commit_list **pptr = NULL;
+
+ /* Graft the fake parents locally to the commit */
+ while (isspace(*p++) && !parse_oid_hex(p, &oid, &p)) {
+ struct commit *parent = lookup_commit(the_repository, &oid);
+ if (!pptr) {
+ /* Free the real parent list */
+ free_commit_list(commit->parents);
+ commit->parents = NULL;
+ pptr = &(commit->parents);
+ }
+ if (parent) {
+ pptr = &commit_list_insert(parent, pptr)->next;
+ }
+ }
+ return log_tree_commit(&log_tree_opt, commit);
+}
+
+/* Diff two trees. */
+static int stdin_diff_trees(struct tree *tree1, const char *p)
+{
+ struct object_id oid;
+ struct tree *tree2;
+ if (!isspace(*p++) || parse_oid_hex(p, &oid, &p) || *p)
+ return error("Need exactly two trees, separated by a space");
+ tree2 = lookup_tree(the_repository, &oid);
+ if (!tree2 || parse_tree(tree2))
+ return -1;
+ printf("%s %s\n", oid_to_hex(&tree1->object.oid),
+ oid_to_hex(&tree2->object.oid));
+ diff_tree_oid(&tree1->object.oid, &tree2->object.oid,
+ "", &log_tree_opt.diffopt);
+ log_tree_diff_flush(&log_tree_opt);
+ return 0;
+}
+
+static int diff_tree_stdin(char *line)
+{
+ int len = strlen(line);
+ struct object_id oid;
+ struct object *obj;
+ const char *p;
+
+ if (!len || line[len-1] != '\n')
+ return -1;
+ line[len-1] = 0;
+ if (parse_oid_hex(line, &oid, &p))
+ return -1;
+ obj = parse_object(the_repository, &oid);
+ if (!obj)
+ return -1;
+ if (obj->type == OBJ_COMMIT)
+ return stdin_diff_commit((struct commit *)obj, p);
+ if (obj->type == OBJ_TREE)
+ return stdin_diff_trees((struct tree *)obj, p);
+ error("Object %s is a %s, not a commit or tree",
+ oid_to_hex(&oid), type_name(obj->type));
+ return -1;
+}
+
+static const char diff_tree_usage[] =
+"git diff-tree [--stdin] [-m] [-s] [-v] [--no-commit-id] [--pretty]\n"
+" [-t] [-r] [-c | --cc] [--combined-all-paths] [--root] [--merge-base]\n"
+" [<common-diff-options>] <tree-ish> [<tree-ish>] [<path>...]\n"
+"\n"
+" -r diff recursively\n"
+" -c show combined diff for merge commits\n"
+" --cc show combined diff for merge commits removing uninteresting hunks\n"
+" --combined-all-paths\n"
+" show name of file in all parents for combined diffs\n"
+" --root include the initial commit as diff against /dev/null\n"
+COMMON_DIFF_OPTIONS_HELP;
+
+static void diff_tree_tweak_rev(struct rev_info *rev)
+{
+ if (!rev->diffopt.output_format) {
+ if (rev->dense_combined_merges)
+ rev->diffopt.output_format = DIFF_FORMAT_PATCH;
+ else
+ rev->diffopt.output_format = DIFF_FORMAT_RAW;
+ }
+}
+
+int cmd_diff_tree(int argc, const char **argv, const char *prefix)
+{
+ char line[1000];
+ struct object *tree1, *tree2;
+ static struct rev_info *opt = &log_tree_opt;
+ struct setup_revision_opt s_r_opt;
+ struct userformat_want w;
+ int read_stdin = 0;
+ int merge_base = 0;
+
+ if (argc == 2 && !strcmp(argv[1], "-h"))
+ usage(diff_tree_usage);
+
+ git_config(git_diff_basic_config, NULL); /* no "diff" UI options */
+
+ prepare_repo_settings(the_repository);
+ the_repository->settings.command_requires_full_index = 0;
+
+ repo_init_revisions(the_repository, opt, prefix);
+ if (repo_read_index(the_repository) < 0)
+ die(_("index file corrupt"));
+ opt->abbrev = 0;
+ opt->diff = 1;
+ opt->disable_stdin = 1;
+ memset(&s_r_opt, 0, sizeof(s_r_opt));
+ s_r_opt.tweak = diff_tree_tweak_rev;
+
+ prefix = precompose_argv_prefix(argc, argv, prefix);
+ argc = setup_revisions(argc, argv, opt, &s_r_opt);
+
+ memset(&w, 0, sizeof(w));
+ userformat_find_requirements(NULL, &w);
+
+ if (!opt->show_notes_given && w.notes)
+ opt->show_notes = 1;
+ if (opt->show_notes)
+ load_display_notes(&opt->notes_opt);
+
+ while (--argc > 0) {
+ const char *arg = *++argv;
+
+ if (!strcmp(arg, "--stdin")) {
+ read_stdin = 1;
+ continue;
+ }
+ if (!strcmp(arg, "--merge-base")) {
+ merge_base = 1;
+ continue;
+ }
+ usage(diff_tree_usage);
+ }
+
+ if (read_stdin && merge_base)
+ die(_("options '%s' and '%s' cannot be used together"), "--stdin", "--merge-base");
+ if (merge_base && opt->pending.nr != 2)
+ die(_("--merge-base only works with two commits"));
+
+ opt->diffopt.rotate_to_strict = 1;
+
+ /*
+ * NOTE! We expect "a..b" to expand to "^a b" but it is
+ * perfectly valid for revision range parser to yield "b ^a",
+ * which means the same thing. If we get the latter, i.e. the
+ * second one is marked UNINTERESTING, we recover the original
+ * order the user gave, i.e. "a..b", by swapping the trees.
+ */
+ switch (opt->pending.nr) {
+ case 0:
+ if (!read_stdin)
+ usage(diff_tree_usage);
+ break;
+ case 1:
+ tree1 = opt->pending.objects[0].item;
+ diff_tree_commit_oid(&tree1->oid);
+ break;
+ case 2:
+ tree1 = opt->pending.objects[0].item;
+ tree2 = opt->pending.objects[1].item;
+ if (merge_base) {
+ struct object_id oid;
+
+ diff_get_merge_base(opt, &oid);
+ tree1 = lookup_object(the_repository, &oid);
+ } else if (tree2->flags & UNINTERESTING) {
+ SWAP(tree2, tree1);
+ }
+ diff_tree_oid(&tree1->oid, &tree2->oid, "", &opt->diffopt);
+ log_tree_diff_flush(opt);
+ break;
+ }
+
+ if (read_stdin) {
+ int saved_nrl = 0;
+ int saved_dcctc = 0;
+
+ opt->diffopt.rotate_to_strict = 0;
+ opt->diffopt.no_free = 1;
+ if (opt->diffopt.detect_rename) {
+ if (!the_index.cache)
+ repo_read_index(the_repository);
+ opt->diffopt.setup |= DIFF_SETUP_USE_SIZE_CACHE;
+ }
+ while (fgets(line, sizeof(line), stdin)) {
+ struct object_id oid;
+
+ if (get_oid_hex(line, &oid)) {
+ fputs(line, stdout);
+ fflush(stdout);
+ }
+ else {
+ diff_tree_stdin(line);
+ if (saved_nrl < opt->diffopt.needed_rename_limit)
+ saved_nrl = opt->diffopt.needed_rename_limit;
+ if (opt->diffopt.degraded_cc_to_c)
+ saved_dcctc = 1;
+ }
+ }
+ opt->diffopt.degraded_cc_to_c = saved_dcctc;
+ opt->diffopt.needed_rename_limit = saved_nrl;
+ opt->diffopt.no_free = 0;
+ diff_free(&opt->diffopt);
+ }
+
+ return diff_result_code(&opt->diffopt);
+}