/* * Builtin "git diff" * * Copyright (c) 2006 Junio C Hamano */ #include "cache.h" #include "color.h" #include "commit.h" #include "blob.h" #include "tag.h" #include "diff.h" #include "diffcore.h" #include "revision.h" #include "log-tree.h" #include "builtin.h" #include "submodule.h" #include "sha1-array.h" struct blobinfo { unsigned char sha1[20]; const char *name; unsigned mode; }; static const char builtin_diff_usage[] = "git diff [<options>] [<commit> [<commit>]] [--] [<path>...]"; static void stuff_change(struct diff_options *opt, unsigned old_mode, unsigned new_mode, const unsigned char *old_sha1, const unsigned char *new_sha1, int old_sha1_valid, int new_sha1_valid, const char *old_name, const char *new_name) { struct diff_filespec *one, *two; if (!is_null_sha1(old_sha1) && !is_null_sha1(new_sha1) && !hashcmp(old_sha1, new_sha1) && (old_mode == new_mode)) return; if (DIFF_OPT_TST(opt, REVERSE_DIFF)) { unsigned tmp; const unsigned char *tmp_u; const char *tmp_c; tmp = old_mode; old_mode = new_mode; new_mode = tmp; tmp_u = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_u; tmp_c = old_name; old_name = new_name; new_name = tmp_c; } if (opt->prefix && (strncmp(old_name, opt->prefix, opt->prefix_length) || strncmp(new_name, opt->prefix, opt->prefix_length))) return; one = alloc_filespec(old_name); two = alloc_filespec(new_name); fill_filespec(one, old_sha1, old_sha1_valid, old_mode); fill_filespec(two, new_sha1, new_sha1_valid, new_mode); diff_queue(&diff_queued_diff, one, two); } static int builtin_diff_b_f(struct rev_info *revs, int argc, const char **argv, struct blobinfo *blob, const char *path) { /* Blob vs file in the working tree*/ struct stat st; if (argc > 1) usage(builtin_diff_usage); if (lstat(path, &st)) die_errno(_("failed to stat '%s'"), path); if (!(S_ISREG(st.st_mode) || S_ISLNK(st.st_mode))) die(_("'%s': not a regular file or symlink"), path); diff_set_mnemonic_prefix(&revs->diffopt, "o/", "w/"); if (blob[0].mode == S_IFINVALID) blob[0].mode = canon_mode(st.st_mode); stuff_change(&revs->diffopt, blob[0].mode, canon_mode(st.st_mode), blob[0].sha1, null_sha1, 1, 0, path, path); diffcore_std(&revs->diffopt); diff_flush(&revs->diffopt); return 0; } static int builtin_diff_blobs(struct rev_info *revs, int argc, const char **argv, struct blobinfo *blob) { unsigned mode = canon_mode(S_IFREG | 0644); if (argc > 1) usage(builtin_diff_usage); if (blob[0].mode == S_IFINVALID) blob[0].mode = mode; if (blob[1].mode == S_IFINVALID) blob[1].mode = mode; stuff_change(&revs->diffopt, blob[0].mode, blob[1].mode, blob[0].sha1, blob[1].sha1, 1, 1, blob[0].name, blob[1].name); diffcore_std(&revs->diffopt); diff_flush(&revs->diffopt); return 0; } static int builtin_diff_index(struct rev_info *revs, int argc, const char **argv) { int cached = 0; while (1 < argc) { const char *arg = argv[1]; if (!strcmp(arg, "--cached") || !strcmp(arg, "--staged")) cached = 1; else usage(builtin_diff_usage); argv++; argc--; } if (!cached) setup_work_tree(); /* * Make sure there is one revision (i.e. pending object), * and there is no revision filtering parameters. */ if (revs->pending.nr != 1 || revs->max_count != -1 || revs->min_age != -1 || revs->max_age != -1) usage(builtin_diff_usage); if (read_cache_preload(revs->diffopt.pathspec.raw) < 0) { perror("read_cache_preload"); return -1; } return run_diff_index(revs, cached); } static int builtin_diff_tree(struct rev_info *revs, int argc, const char **argv, struct object_array_entry *ent) { const unsigned char *(sha1[2]); int swap = 0; if (argc > 1) usage(builtin_diff_usage); /* We saw two trees, ent[0] and ent[1]. * if ent[1] is uninteresting, they are swapped */ if (ent[1].item->flags & UNINTERESTING) swap = 1; sha1[swap] = ent[0].item->sha1; sha1[1-swap] = ent[1].item->sha1; diff_tree_sha1(sha1[0], sha1[1], "", &revs->diffopt); log_tree_diff_flush(revs); return 0; } static int builtin_diff_combined(struct rev_info *revs, int argc, const char **argv, struct object_array_entry *ent, int ents) { struct sha1_array parents = SHA1_ARRAY_INIT; int i; if (argc > 1) usage(builtin_diff_usage); if (!revs->dense_combined_merges && !revs->combine_merges) revs->dense_combined_merges = revs->combine_merges = 1; for (i = 1; i < ents; i++) sha1_array_append(&parents, ent[i].item->sha1); diff_tree_combined(ent[0].item->sha1, &parents, revs->dense_combined_merges, revs); sha1_array_clear(&parents); return 0; } static void refresh_index_quietly(void) { struct lock_file *lock_file; int fd; lock_file = xcalloc(1, sizeof(struct lock_file)); fd = hold_locked_index(lock_file, 0); if (fd < 0) return; discard_cache(); read_cache(); refresh_cache(REFRESH_QUIET|REFRESH_UNMERGED); update_index_if_able(&the_index, lock_file); } static int builtin_diff_files(struct rev_info *revs, int argc, const char **argv) { unsigned int options = 0; while (1 < argc && argv[1][0] == '-') { if (!strcmp(argv[1], "--base")) revs->max_count = 1; else if (!strcmp(argv[1], "--ours")) revs->max_count = 2; else if (!strcmp(argv[1], "--theirs")) revs->max_count = 3; else if (!strcmp(argv[1], "-q")) options |= DIFF_SILENT_ON_REMOVED; else if (!strcmp(argv[1], "-h")) usage(builtin_diff_usage); else return error(_("invalid option: %s"), argv[1]); argv++; argc--; } /* * "diff --base" should not combine merges because it was not * asked to. "diff -c" should not densify (if the user wants * dense one, --cc can be explicitly asked for, or just rely * on the default). */ if (revs->max_count == -1 && !revs->combine_merges && (revs->diffopt.output_format & DIFF_FORMAT_PATCH)) revs->combine_merges = revs->dense_combined_merges = 1; setup_work_tree(); if (read_cache_preload(revs->diffopt.pathspec.raw) < 0) { perror("read_cache_preload"); return -1; } return run_diff_files(revs, options); } int cmd_diff(int argc, const char **argv, const char *prefix) { int i; struct rev_info rev; struct object_array_entry ent[100]; int ents = 0, blobs = 0, paths = 0; const char *path = NULL; struct blobinfo blob[2]; int nongit; int result = 0; /* * We could get N tree-ish in the rev.pending_objects list. * Also there could be M blobs there, and P pathspecs. * * N=0, M=0: * cache vs files (diff-files) * N=0, M=2: * compare two random blobs. P must be zero. * N=0, M=1, P=1: * compare a blob with a working tree file. * * N=1, M=0: * tree vs cache (diff-index --cached) * * N=2, M=0: * tree vs tree (diff-tree) * * N=0, M=0, P=2: * compare two filesystem entities (aka --no-index). * * Other cases are errors. */ prefix = setup_git_directory_gently(&nongit); gitmodules_config(); git_config(git_diff_ui_config, NULL); init_revisions(&rev, prefix); /* If this is a no-index diff, just run it and exit there. */ diff_no_index(&rev, argc, argv, nongit, prefix); /* Otherwise, we are doing the usual "git" diff */ rev.diffopt.skip_stat_unmatch = !!diff_auto_refresh_index; /* Scale to real terminal size and respect statGraphWidth config */ rev.diffopt.stat_width = -1; rev.diffopt.stat_graph_width = -1; /* Default to let external and textconv be used */ DIFF_OPT_SET(&rev.diffopt, ALLOW_EXTERNAL); DIFF_OPT_SET(&rev.diffopt, ALLOW_TEXTCONV); if (nongit) die(_("Not a git repository")); argc = setup_revisions(argc, argv, &rev, NULL); if (!rev.diffopt.output_format) { rev.diffopt.output_format = DIFF_FORMAT_PATCH; diff_setup_done(&rev.diffopt); } DIFF_OPT_SET(&rev.diffopt, RECURSIVE); setup_diff_pager(&rev.diffopt); /* * Do we have --cached and not have a pending object, then * default to HEAD by hand. Eek. */ if (!rev.pending.nr) { int i; for (i = 1; i < argc; i++) { const char *arg = argv[i]; if (!strcmp(arg, "--")) break; else if (!strcmp(arg, "--cached") || !strcmp(arg, "--staged")) { add_head_to_pending(&rev); if (!rev.pending.nr) { struct tree *tree; tree = lookup_tree(EMPTY_TREE_SHA1_BIN); add_pending_object(&rev, &tree->object, "HEAD"); } break; } } } for (i = 0; i < rev.pending.nr; i++) { struct object_array_entry *list = rev.pending.objects+i; struct object *obj = list->item; const char *name = list->name; int flags = (obj->flags & UNINTERESTING); if (!obj->parsed) obj = parse_object(obj->sha1); obj = deref_tag(obj, NULL, 0); if (!obj) die(_("invalid object '%s' given."), name); if (obj->type == OBJ_COMMIT) obj = &((struct commit *)obj)->tree->object; if (obj->type == OBJ_TREE) { if (ARRAY_SIZE(ent) <= ents) die(_("more than %d trees given: '%s'"), (int) ARRAY_SIZE(ent), name); obj->flags |= flags; ent[ents].item = obj; ent[ents].name = name; ents++; continue; } if (obj->type == OBJ_BLOB) { if (2 <= blobs) die(_("more than two blobs given: '%s'"), name); hashcpy(blob[blobs].sha1, obj->sha1); blob[blobs].name = name; blob[blobs].mode = list->mode; blobs++; continue; } die(_("unhandled object '%s' given."), name); } if (rev.prune_data.nr) { if (!path) path = rev.prune_data.items[0].match; paths += rev.prune_data.nr; } /* * Now, do the arguments look reasonable? */ if (!ents) { switch (blobs) { case 0: result = builtin_diff_files(&rev, argc, argv); break; case 1: if (paths != 1) usage(builtin_diff_usage); result = builtin_diff_b_f(&rev, argc, argv, blob, path); break; case 2: if (paths) usage(builtin_diff_usage); result = builtin_diff_blobs(&rev, argc, argv, blob); break; default: usage(builtin_diff_usage); } } else if (blobs) usage(builtin_diff_usage); else if (ents == 1) result = builtin_diff_index(&rev, argc, argv); else if (ents == 2) result = builtin_diff_tree(&rev, argc, argv, ent); 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[ents-1]; result = builtin_diff_tree(&rev, argc, argv, ent); } else result = builtin_diff_combined(&rev, argc, argv, ent, ents); result = diff_result_code(&rev.diffopt, result); if (1 < rev.diffopt.skip_stat_unmatch) refresh_index_quietly(); return result; } void setup_diff_pager(struct diff_options *opt) { /* * If the user asked for our exit code, then either they want --quiet * or --exit-code. We should definitely not bother with a pager in the * former case, as we will generate no output. Since we still properly * report our exit code even when a pager is run, we _could_ run a * pager with --exit-code. But since we have not done so historically, * and because it is easy to find people oneline advising "git diff * --exit-code" in hooks and other scripts, we do not do so. */ if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) && check_pager_config("diff") != 0) setup_pager(); }