diff options
Diffstat (limited to 'third_party/git/builtin/diff-tree.c')
| -rw-r--r-- | third_party/git/builtin/diff-tree.c | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/third_party/git/builtin/diff-tree.c b/third_party/git/builtin/diff-tree.c new file mode 100644 index 000000000000..cb9ea793675c --- /dev/null +++ b/third_party/git/builtin/diff-tree.c @@ -0,0 +1,196 @@ +#define USE_THE_INDEX_COMPATIBILITY_MACROS +#include "cache.h" +#include "config.h" +#include "diff.h" +#include "commit.h" +#include "log-tree.h" +#include "builtin.h" +#include "submodule.h" +#include "repository.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] [-c | --cc] [-s] [-v] [--pretty] [-t] [-r] [--root] " +"[<common-diff-options>] <tree-ish> [<tree-ish>] [<path>...]\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, struct setup_revision_opt *opt) +{ + 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; + int read_stdin = 0; + + if (argc == 2 && !strcmp(argv[1], "-h")) + usage(diff_tree_usage); + + git_config(git_diff_basic_config, NULL); /* no "diff" UI options */ + repo_init_revisions(the_repository, opt, prefix); + if (read_cache() < 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; + + precompose_argv(argc, argv); + argc = setup_revisions(argc, argv, opt, &s_r_opt); + + while (--argc > 0) { + const char *arg = *++argv; + + if (!strcmp(arg, "--stdin")) { + read_stdin = 1; + continue; + } + usage(diff_tree_usage); + } + + /* + * 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 (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; + + 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; + } + + return diff_result_code(&opt->diffopt, 0); +} |