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/* * Builtin "git diff" * * Copyright (c) 2006 Junio C Hamano */ #include "cache.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" /* NEEDSWORK: struct object has place for name but we _do_ * know mode when we extracted the blob out of a tree, which * we currently lose. */ struct blobinfo { unsigned char sha1[20]; const char *name; }; static const char builtin_diff_usage[] = "git-diff <options> <rev>{0,2} -- <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)) return; if (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; } one = alloc_filespec(old_name); two = alloc_filespec(new_name); fill_filespec(one, old_sha1, old_mode); fill_filespec(two, new_sha1, new_mode); /* NEEDSWORK: shouldn't this part of diffopt??? */ 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("'%s': %s", path, strerror(errno)); if (!(S_ISREG(st.st_mode) || S_ISLNK(st.st_mode))) die("'%s': not a regular file or symlink", path); stuff_change(&revs->diffopt, canon_mode(st.st_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); stuff_change(&revs->diffopt, mode, 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")) cached = 1; else usage(builtin_diff_usage); argv++; argc--; } /* * 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); 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) { const unsigned char (*parent)[20]; 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; parent = xmalloc(ents * sizeof(*parent)); /* Again, the revs are all reverse */ for (i = 0; i < ents; i++) hashcpy((unsigned char*)parent + i, ent[ents - 1 - i].item->sha1); diff_tree_combined(parent[0], parent + 1, ents - 1, revs->dense_combined_merges, revs); return 0; } void add_head(struct rev_info *revs) { unsigned char sha1[20]; struct object *obj; if (get_sha1("HEAD", sha1)) return; obj = parse_object(sha1); if (!obj) return; add_pending_object(revs, obj, "HEAD"); } 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 = 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) * * Other cases are errors. */ prefix = setup_git_directory_gently(&nongit); git_config(git_diff_ui_config); init_revisions(&rev, prefix); 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"); } /* 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")) { add_head(&rev); 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; blobs++; continue; } die("unhandled object '%s' given.", name); } if (rev.prune_data) { const char **pathspec = rev.prune_data; while (*pathspec) { if (!path) path = *pathspec; paths++; pathspec++; } } /* * Now, do the arguments look reasonable? */ if (!ents) { switch (blobs) { case 0: return run_diff_files_cmd(&rev, argc, argv); break; case 1: if (paths != 1) usage(builtin_diff_usage); return builtin_diff_b_f(&rev, argc, argv, blob, path); break; case 2: if (paths) usage(builtin_diff_usage); return builtin_diff_blobs(&rev, argc, argv, blob); break; default: usage(builtin_diff_usage); } } else if (blobs) usage(builtin_diff_usage); else if (ents == 1) return builtin_diff_index(&rev, argc, argv); else if (ents == 2) return 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. */ ent[1] = ent[2]; return builtin_diff_tree(&rev, argc, argv, ent); } else return builtin_diff_combined(&rev, argc, argv, ent, ents); usage(builtin_diff_usage); }
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