C++ DIFF_OPT_TST函数代码示例

/* A file entry went away or appeared */
static void show_entry(struct diff_options *opt, const char *prefix,
		       struct tree_desc *desc, struct strbuf *base)
{
	unsigned mode;
	const char *path;
	const unsigned char *sha1 = tree_entry_extract(desc, &path, &mode);
	int pathlen = tree_entry_len(path, sha1);
	int old_baselen = base->len;

	strbuf_add(base, path, pathlen);
	if (DIFF_OPT_TST(opt, RECURSIVE) && S_ISDIR(mode)) {
		enum object_type type;
		struct tree_desc inner;
		void *tree;
		unsigned long size;

		tree = read_sha1_file(sha1, &type, &size);
		if (!tree || type != OBJ_TREE)
			die("corrupt tree sha %s", sha1_to_hex(sha1));

		if (DIFF_OPT_TST(opt, TREE_IN_RECURSIVE))
			opt->add_remove(opt, *prefix, mode, sha1, base->buf, 0);

		strbuf_addch(base, '/');

		init_tree_desc(&inner, tree, size);
		show_tree(opt, prefix, &inner, base);
		free(tree);
	} else
		opt->add_remove(opt, prefix[0], mode, sha1, base->buf, 0);

	strbuf_setlen(base, old_baselen);
}

static int compare_tree_entry(struct tree_desc *t1, struct tree_desc *t2, const char *base, int baselen, struct diff_options *opt)
{
	unsigned mode1, mode2;
	const char *path1, *path2;
	const unsigned char *sha1, *sha2;
	int cmp, pathlen1, pathlen2;
	char *fullname;

	sha1 = tree_entry_extract(t1, &path1, &mode1);
	sha2 = tree_entry_extract(t2, &path2, &mode2);

	pathlen1 = tree_entry_len(path1, sha1);
	pathlen2 = tree_entry_len(path2, sha2);
	cmp = base_name_compare(path1, pathlen1, mode1, path2, pathlen2, mode2);
	if (cmp < 0) {
		show_entry(opt, "-", t1, base, baselen);
		return -1;
	}
	if (cmp > 0) {
		show_entry(opt, "+", t2, base, baselen);
		return 1;
	}
	if (!DIFF_OPT_TST(opt, FIND_COPIES_HARDER) && !hashcmp(sha1, sha2) && mode1 == mode2)
		return 0;

	/*
	 * If the filemode has changed to/from a directory from/to a regular
	 * file, we need to consider it a remove and an add.
	 */
	if (S_ISDIR(mode1) != S_ISDIR(mode2)) {
		show_entry(opt, "-", t1, base, baselen);
		show_entry(opt, "+", t2, base, baselen);
		return 0;
	}

	if (DIFF_OPT_TST(opt, RECURSIVE) && S_ISDIR(mode1)) {
		int retval;
		char *newbase = malloc_base(base, baselen, path1, pathlen1);
		if (DIFF_OPT_TST(opt, TREE_IN_RECURSIVE)) {
			newbase[baselen + pathlen1] = 0;
			opt->change(opt, mode1, mode2,
				    sha1, sha2, newbase);
			newbase[baselen + pathlen1] = '/';
		}
		retval = diff_tree_sha1(sha1, sha2, newbase, opt);
		free(newbase);
		return retval;
	}

	fullname = malloc_fullname(base, baselen, path1, pathlen1);
	opt->change(opt, mode1, mode2, sha1, sha2, fullname);
	free(fullname);
	return 0;
}

/*
 * Has a file changed or has a submodule new commits or a dirty work tree?
 *
 * Return 1 when changes are detected, 0 otherwise. If the DIRTY_SUBMODULES
 * option is set, the caller does not only want to know if a submodule is
 * modified at all but wants to know all the conditions that are met (new
 * commits, untracked content and/or modified content).
 */
static int match_stat_with_submodule(struct diff_options *diffopt,
				      struct cache_entry *ce, struct stat *st,
				      unsigned ce_option, unsigned *dirty_submodule)
{
	int changed = ce_match_stat(ce, st, ce_option);
	if (S_ISGITLINK(ce->ce_mode)
	    && !DIFF_OPT_TST(diffopt, IGNORE_SUBMODULES)
	    && (!changed || DIFF_OPT_TST(diffopt, DIRTY_SUBMODULES))) {
		*dirty_submodule = is_submodule_modified(ce->name, DIFF_OPT_TST(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES));
	}
	return changed;
}

static int compare_tree_entry(struct tree_desc *t1, struct tree_desc *t2,
			      struct strbuf *base, struct diff_options *opt)
{
	unsigned mode1, mode2;
	const char *path1, *path2;
	const unsigned char *sha1, *sha2;
	int cmp, pathlen1, pathlen2;
	int old_baselen = base->len;

	sha1 = tree_entry_extract(t1, &path1, &mode1);
	sha2 = tree_entry_extract(t2, &path2, &mode2);

	pathlen1 = tree_entry_len(path1, sha1);
	pathlen2 = tree_entry_len(path2, sha2);
	cmp = base_name_compare(path1, pathlen1, mode1, path2, pathlen2, mode2);
	if (cmp < 0) {
		show_entry(opt, "-", t1, base);
		return -1;
	}
	if (cmp > 0) {
		show_entry(opt, "+", t2, base);
		return 1;
	}
	if (!DIFF_OPT_TST(opt, FIND_COPIES_HARDER) && !hashcmp(sha1, sha2) && mode1 == mode2)
		return 0;

	/*
	 * If the filemode has changed to/from a directory from/to a regular
	 * file, we need to consider it a remove and an add.
	 */
	if (S_ISDIR(mode1) != S_ISDIR(mode2)) {
		show_entry(opt, "-", t1, base);
		show_entry(opt, "+", t2, base);
		return 0;
	}

	strbuf_add(base, path1, pathlen1);
	if (DIFF_OPT_TST(opt, RECURSIVE) && S_ISDIR(mode1)) {
		if (DIFF_OPT_TST(opt, TREE_IN_RECURSIVE)) {
			opt->change(opt, mode1, mode2,
				    sha1, sha2, base->buf, 0, 0);
		}
		strbuf_addch(base, '/');
		diff_tree_sha1(sha1, sha2, base->buf, opt);
	} else {
		opt->change(opt, mode1, mode2, sha1, sha2, base->buf, 0, 0);
	}
	strbuf_setlen(base, old_baselen);
	return 0;
}

/* A file entry went away or appeared */
static void show_entry(struct diff_options *opt, const char *prefix, struct tree_desc *desc,
		       const char *base, int baselen)
{
	unsigned mode;
	const char *path;
	const unsigned char *sha1 = tree_entry_extract(desc, &path, &mode);
	int pathlen = tree_entry_len(path, sha1);

	if (DIFF_OPT_TST(opt, RECURSIVE) && S_ISDIR(mode)) {
		enum object_type type;
		char *newbase = malloc_base(base, baselen, path, pathlen);
		struct tree_desc inner;
		void *tree;
		unsigned long size;

		tree = read_sha1_file(sha1, &type, &size);
		if (!tree || type != OBJ_TREE)
			die("corrupt tree sha %s", sha1_to_hex(sha1));

		init_tree_desc(&inner, tree, size);
		show_tree(opt, prefix, &inner, newbase, baselen + 1 + pathlen);

		free(tree);
		free(newbase);
	} else {
		char *fullname = malloc_fullname(base, baselen, path, pathlen);
		opt->add_remove(opt, prefix[0], mode, sha1, fullname);
		free(fullname);
	}
}

/*
 * Given an origin, prepare mmfile_t structure to be used by the
 * diff machinery
 */
static void fill_origin_blob(struct diff_options *opt,
			     struct blame_origin *o, mmfile_t *file, int *num_read_blob)
{
	if (!o->file.ptr) {
		enum object_type type;
		unsigned long file_size;

		(*num_read_blob)++;
		if (DIFF_OPT_TST(opt, ALLOW_TEXTCONV) &&
		    textconv_object(o->path, o->mode, &o->blob_oid, 1, &file->ptr, &file_size))
			;
		else
			file->ptr = read_sha1_file(o->blob_oid.hash, &type,
						   &file_size);
		file->size = file_size;

		if (!file->ptr)
			die("Cannot read blob %s for path %s",
			    oid_to_hex(&o->blob_oid),
			    o->path);
		o->file = *file;
	}
	else
		*file = o->file;
}

static void cmd_log_init(int argc, const char **argv, const char *prefix,
		      struct rev_info *rev)
{
	int i;
	int decorate = 0;

	rev->abbrev = DEFAULT_ABBREV;
	rev->commit_format = CMIT_FMT_DEFAULT;
	if (fmt_pretty)
		get_commit_format(fmt_pretty, rev);
	rev->verbose_header = 1;
	DIFF_OPT_SET(&rev->diffopt, RECURSIVE);
	rev->show_root_diff = default_show_root;
	rev->subject_prefix = fmt_patch_subject_prefix;
	argc = setup_revisions(argc, argv, rev, "HEAD");
	if (rev->diffopt.pickaxe || rev->diffopt.filter)
		rev->always_show_header = 0;
	if (DIFF_OPT_TST(&rev->diffopt, FOLLOW_RENAMES)) {
		rev->always_show_header = 0;
		if (rev->diffopt.nr_paths != 1)
			usage("git logs can only follow renames on one pathname at a time");
	}
	for (i = 1; i < argc; i++) {
		const char *arg = argv[i];
		if (!strcmp(arg, "--decorate")) {
			if (!decorate)
				for_each_ref(add_ref_decoration, NULL);
			decorate = 1;
		} else
			die("unrecognized argument: %s", arg);
	}
}

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 cmd_log_walk(struct rev_info *rev)
{
	struct commit *commit;

	if (rev->early_output)
		setup_early_output(rev);

	if (prepare_revision_walk(rev))
		die("revision walk setup failed");

	if (rev->early_output)
		finish_early_output(rev);

	/*
	 * For --check and --exit-code, the exit code is based on CHECK_FAILED
	 * and HAS_CHANGES being accumulated in rev->diffopt, so be careful to
	 * retain that state information if replacing rev->diffopt in this loop
	 */
	while ((commit = get_revision(rev)) != NULL) {
		log_tree_commit(rev, commit);
		if (!rev->reflog_info) {
			/* we allow cycles in reflog ancestry */
			free(commit->buffer);
			commit->buffer = NULL;
		}
		free_commit_list(commit->parents);
		commit->parents = NULL;
	}
	if (rev->diffopt.output_format & DIFF_FORMAT_CHECKDIFF &&
	    DIFF_OPT_TST(&rev->diffopt, CHECK_FAILED)) {
		return 02;
	}
	return diff_result_code(&rev->diffopt, 0);
}

static int reopen_stdout(struct commit *commit, struct rev_info *rev)
{
	struct strbuf filename = STRBUF_INIT;
	int suffix_len = strlen(fmt_patch_suffix) + 1;

	if (output_directory) {
		strbuf_addstr(&filename, output_directory);
		if (filename.len >=
		    PATH_MAX - FORMAT_PATCH_NAME_MAX - suffix_len)
			return error("name of output directory is too long");
		if (filename.buf[filename.len - 1] != '/')
			strbuf_addch(&filename, '/');
	}

	get_patch_filename(commit, rev->nr, fmt_patch_suffix, &filename);

	if (!DIFF_OPT_TST(&rev->diffopt, QUIET))
		fprintf(realstdout, "%s\n", filename.buf + outdir_offset);

	if (freopen(filename.buf, "w", stdout) == NULL)
		return error("Cannot open patch file %s", filename.buf);

	strbuf_release(&filename);
	return 0;
}

static void diffcore_pickaxe_count(struct diff_options *o)
{
	const char *needle = o->pickaxe;
	int opts = o->pickaxe_opts;
	unsigned long len = strlen(needle);
	regex_t regex, *regexp = NULL;
	kwset_t kws = NULL;

	if (opts & DIFF_PICKAXE_REGEX) {
		int err;
		err = regcomp(&regex, needle, REG_EXTENDED | REG_NEWLINE);
		if (err) {
			/* The POSIX.2 people are surely sick */
			char errbuf[1024];
			regerror(err, &regex, errbuf, 1024);
			regfree(&regex);
			die("invalid pickaxe regex: %s", errbuf);
		}
		regexp = &regex;
	} else {
		kws = kwsalloc(DIFF_OPT_TST(o, PICKAXE_IGNORE_CASE)
			       ? tolower_trans_tbl : NULL);
		kwsincr(kws, needle, len);
		kwsprep(kws);
	}

	pickaxe(&diff_queued_diff, o, regexp, kws, has_changes);

	if (opts & DIFF_PICKAXE_REGEX)
		regfree(&regex);
	else
		kwsfree(kws);
	return;
}

static void stuff_change(struct diff_options *opt,
			 unsigned old_mode, unsigned new_mode,
			 const struct object_id *old_oid,
			 const struct object_id *new_oid,
			 int old_oid_valid,
			 int new_oid_valid,
			 const char *old_path,
			 const char *new_path)
{
	struct diff_filespec *one, *two;

	if (!is_null_oid(old_oid) && !is_null_oid(new_oid) &&
	    !oidcmp(old_oid, new_oid) && (old_mode == new_mode))
		return;

	if (DIFF_OPT_TST(opt, REVERSE_DIFF)) {
		SWAP(old_mode, new_mode);
		SWAP(old_oid, new_oid);
		SWAP(old_path, new_path);
	}

	if (opt->prefix &&
	    (strncmp(old_path, opt->prefix, opt->prefix_length) ||
	     strncmp(new_path, opt->prefix, opt->prefix_length)))
		return;

	one = alloc_filespec(old_path);
	two = alloc_filespec(new_path);
	fill_filespec(one, old_oid, old_oid_valid, old_mode);
	fill_filespec(two, new_oid, new_oid_valid, new_mode);

	diff_queue(&diff_queued_diff, one, two);
}

/*
 * Show the diff of a commit.
 *
 * Return true if we printed any log info messages
 */
static int log_tree_diff(struct rev_info *opt, struct commit *commit, struct log_info *log)
{
	int showed_log;
	struct commit_list *parents;
	unsigned const char *sha1 = commit->object.sha1;

	if (!opt->diff && !DIFF_OPT_TST(&opt->diffopt, EXIT_WITH_STATUS))
		return 0;

	/* Root commit? */
	parents = commit->parents;
	if (!parents) {
		if (opt->show_root_diff) {
			diff_root_tree_sha1(sha1, "", &opt->diffopt);
			log_tree_diff_flush(opt);
		}
		return !opt->loginfo;
	}

	/* More than one parent? */
	if (parents && parents->next) {
		if (opt->ignore_merges)
			return 0;
		else if (opt->combine_merges)
			return do_diff_combined(opt, commit);
		else if (opt->first_parent_only) {
			/*
			 * Generate merge log entry only for the first
			 * parent, showing summary diff of the others
			 * we merged _in_.
			 */
			diff_tree_sha1(parents->item->object.sha1, sha1, "", &opt->diffopt);
			log_tree_diff_flush(opt);
			return !opt->loginfo;
		}

		/* If we show individual diffs, show the parent info */
		log->parent = parents->item;
	}

	showed_log = 0;
	for (;;) {
		struct commit *parent = parents->item;

		diff_tree_sha1(parent->object.sha1, sha1, "", &opt->diffopt);
		log_tree_diff_flush(opt);

		showed_log |= !opt->loginfo;

		/* Set up the log info for the next parent, if any.. */
		parents = parents->next;
		if (!parents)
			break;
		log->parent = parents->item;
		opt->loginfo = log;
	}
	return showed_log;
}

static void cmd_log_init(int argc, const char **argv, const char *prefix,
		      struct rev_info *rev)
{
	int i;
	int decoration_style = 0;

	rev->abbrev = DEFAULT_ABBREV;
	rev->commit_format = CMIT_FMT_DEFAULT;
	if (fmt_pretty)
		get_commit_format(fmt_pretty, rev);
	rev->verbose_header = 1;
	DIFF_OPT_SET(&rev->diffopt, RECURSIVE);
	rev->show_root_diff = default_show_root;
	rev->subject_prefix = fmt_patch_subject_prefix;
	DIFF_OPT_SET(&rev->diffopt, ALLOW_TEXTCONV);

	if (default_date_mode)
		rev->date_mode = parse_date_format(default_date_mode);

	/*
	 * Check for -h before setup_revisions(), or "git log -h" will
	 * fail when run without a git directory.
	 */
	if (argc == 2 && !strcmp(argv[1], "-h"))
		usage(builtin_log_usage);
	argc = setup_revisions(argc, argv, rev, "HEAD");

	if (rev->diffopt.pickaxe || rev->diffopt.filter)
		rev->always_show_header = 0;
	if (DIFF_OPT_TST(&rev->diffopt, FOLLOW_RENAMES)) {
		rev->always_show_header = 0;
		if (rev->diffopt.nr_paths != 1)
			usage("git logs can only follow renames on one pathname at a time");
	}
	for (i = 1; i < argc; i++) {
		const char *arg = argv[i];
		if (!strcmp(arg, "--decorate")) {
			decoration_style = DECORATE_SHORT_REFS;
		} else if (!prefixcmp(arg, "--decorate=")) {
			const char *v = skip_prefix(arg, "--decorate=");
			if (!strcmp(v, "full"))
				decoration_style = DECORATE_FULL_REFS;
			else if (!strcmp(v, "short"))
				decoration_style = DECORATE_SHORT_REFS;
			else
				die("invalid --decorate option: %s", arg);
		} else if (!strcmp(arg, "--source")) {
			rev->show_source = 1;
		} else if (!strcmp(arg, "-h")) {
			usage(builtin_log_usage);
		} else
			die("unrecognized argument: %s", arg);
	}
	if (decoration_style) {
		rev->show_decorations = 1;
		load_ref_decorations(decoration_style);
	}
}

/*
 * Has a file changed or has a submodule new commits or a dirty work tree?
 *
 * Return 1 when changes are detected, 0 otherwise. If the DIRTY_SUBMODULES
 * option is set, the caller does not only want to know if a submodule is
 * modified at all but wants to know all the conditions that are met (new
 * commits, untracked content and/or modified content).
 */
static int match_stat_with_submodule(struct diff_options *diffopt,
                                     struct cache_entry *ce, struct stat *st,
                                     unsigned ce_option, unsigned *dirty_submodule)
{
    int changed = ce_match_stat(ce, st, ce_option);
    if (S_ISGITLINK(ce->ce_mode)) {
        unsigned orig_flags = diffopt->flags;
        if (!DIFF_OPT_TST(diffopt, OVERRIDE_SUBMODULE_CONFIG))
            set_diffopt_flags_from_submodule_config(diffopt, ce->name);
        if (DIFF_OPT_TST(diffopt, IGNORE_SUBMODULES))
            changed = 0;
        else if (!DIFF_OPT_TST(diffopt, IGNORE_DIRTY_SUBMODULES)
                 && (!changed || DIFF_OPT_TST(diffopt, DIRTY_SUBMODULES)))
            *dirty_submodule = is_submodule_modified(ce->name, DIFF_OPT_TST(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES));
        diffopt->flags = orig_flags;
    }
    return changed;
}