diff options
Diffstat (limited to 'builtin/diff.c')
| -rw-r--r-- | builtin/diff.c | 423 |
1 files changed, 423 insertions, 0 deletions
diff --git a/builtin/diff.c b/builtin/diff.c new file mode 100644 index 0000000000..9069dc41be --- /dev/null +++ b/builtin/diff.c @@ -0,0 +1,423 @@ +/* + * 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, + 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_mode); + fill_filespec(two, new_sha1, 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, + 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, + 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; + if (diff_setup_done(&rev.diffopt) < 0) + die(_("diff_setup_done failed")); + } + + DIFF_OPT_SET(&rev.diffopt, RECURSIVE); + + /* + * If the user asked for our exit code then don't start a + * pager or we would end up reporting its exit code instead. + */ + if (!DIFF_OPT_TST(&rev.diffopt, EXIT_WITH_STATUS) && + check_pager_config("diff") != 0) + setup_pager(); + + /* + * 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; +} |