merge(third_party/git): Merge squashed git subtree at v2.23.0

Merge commit '1b593e1ea4' as 'third_party/git'

third_party/git/builtin/check-ignore.c

@@ -0,0 +1,193 @@
+#define USE_THE_INDEX_COMPATIBILITY_MACROS
+#include "builtin.h"
+#include "cache.h"
+#include "config.h"
+#include "dir.h"
+#include "quote.h"
+#include "pathspec.h"
+#include "parse-options.h"
+#include "submodule.h"
+
+static int quiet, verbose, stdin_paths, show_non_matching, no_index;
+static const char * const check_ignore_usage[] = {
+"git check-ignore [<options>] <pathname>...",
+"git check-ignore [<options>] --stdin",
+NULL
+};
+
+static int nul_term_line;
+
+static const struct option check_ignore_options[] = {
+	OPT__QUIET(&quiet, N_("suppress progress reporting")),
+	OPT__VERBOSE(&verbose, N_("be verbose")),
+	OPT_GROUP(""),
+	OPT_BOOL(0, "stdin", &stdin_paths,
+		 N_("read file names from stdin")),
+	OPT_BOOL('z', NULL, &nul_term_line,
+		 N_("terminate input and output records by a NUL character")),
+	OPT_BOOL('n', "non-matching", &show_non_matching,
+		 N_("show non-matching input paths")),
+	OPT_BOOL(0, "no-index", &no_index,
+		 N_("ignore index when checking")),
+	OPT_END()
+};
+
+static void output_exclude(const char *path, struct exclude *exclude)
+{
+	char *bang  = (exclude && exclude->flags & EXC_FLAG_NEGATIVE)  ? "!" : "";
+	char *slash = (exclude && exclude->flags & EXC_FLAG_MUSTBEDIR) ? "/" : "";
+	if (!nul_term_line) {
+		if (!verbose) {
+			write_name_quoted(path, stdout, '\n');
+		} else {
+			if (exclude) {
+				quote_c_style(exclude->el->src, NULL, stdout, 0);
+				printf(":%d:%s%s%s\t",
+				       exclude->srcpos,
+				       bang, exclude->pattern, slash);
+			}
+			else {
+				printf("::\t");
+			}
+			quote_c_style(path, NULL, stdout, 0);
+			fputc('\n', stdout);
+		}
+	} else {
+		if (!verbose) {
+			printf("%s%c", path, '\0');
+		} else {
+			if (exclude)
+				printf("%s%c%d%c%s%s%s%c%s%c",
+				       exclude->el->src, '\0',
+				       exclude->srcpos, '\0',
+				       bang, exclude->pattern, slash, '\0',
+				       path, '\0');
+			else
+				printf("%c%c%c%s%c", '\0', '\0', '\0', path, '\0');
+		}
+	}
+}
+
+static int check_ignore(struct dir_struct *dir,
+			const char *prefix, int argc, const char **argv)
+{
+	const char *full_path;
+	char *seen;
+	int num_ignored = 0, i;
+	struct exclude *exclude;
+	struct pathspec pathspec;
+
+	if (!argc) {
+		if (!quiet)
+			fprintf(stderr, "no pathspec given.\n");
+		return 0;
+	}
+
+	/*
+	 * check-ignore just needs paths. Magic beyond :/ is really
+	 * irrelevant.
+	 */
+	parse_pathspec(&pathspec,
+		       PATHSPEC_ALL_MAGIC & ~PATHSPEC_FROMTOP,
+		       PATHSPEC_SYMLINK_LEADING_PATH |
+		       PATHSPEC_KEEP_ORDER,
+		       prefix, argv);
+
+	die_path_inside_submodule(&the_index, &pathspec);
+
+	/*
+	 * look for pathspecs matching entries in the index, since these
+	 * should not be ignored, in order to be consistent with
+	 * 'git status', 'git add' etc.
+	 */
+	seen = find_pathspecs_matching_against_index(&pathspec, &the_index);
+	for (i = 0; i < pathspec.nr; i++) {
+		full_path = pathspec.items[i].match;
+		exclude = NULL;
+		if (!seen[i]) {
+			int dtype = DT_UNKNOWN;
+			exclude = last_exclude_matching(dir, &the_index,
+							full_path, &dtype);
+		}
+		if (!quiet && (exclude || show_non_matching))
+			output_exclude(pathspec.items[i].original, exclude);
+		if (exclude)
+			num_ignored++;
+	}
+	free(seen);
+
+	return num_ignored;
+}
+
+static int check_ignore_stdin_paths(struct dir_struct *dir, const char *prefix)
+{
+	struct strbuf buf = STRBUF_INIT;
+	struct strbuf unquoted = STRBUF_INIT;
+	char *pathspec[2] = { NULL, NULL };
+	strbuf_getline_fn getline_fn;
+	int num_ignored = 0;
+
+	getline_fn = nul_term_line ? strbuf_getline_nul : strbuf_getline_lf;
+	while (getline_fn(&buf, stdin) != EOF) {
+		if (!nul_term_line && buf.buf[0] == '"') {
+			strbuf_reset(&unquoted);
+			if (unquote_c_style(&unquoted, buf.buf, NULL))
+				die("line is badly quoted");
+			strbuf_swap(&buf, &unquoted);
+		}
+		pathspec[0] = buf.buf;
+		num_ignored += check_ignore(dir, prefix,
+					    1, (const char **)pathspec);
+		maybe_flush_or_die(stdout, "check-ignore to stdout");
+	}
+	strbuf_release(&buf);
+	strbuf_release(&unquoted);
+	return num_ignored;
+}
+
+int cmd_check_ignore(int argc, const char **argv, const char *prefix)
+{
+	int num_ignored;
+	struct dir_struct dir;
+
+	git_config(git_default_config, NULL);
+
+	argc = parse_options(argc, argv, prefix, check_ignore_options,
+			     check_ignore_usage, 0);
+
+	if (stdin_paths) {
+		if (argc > 0)
+			die(_("cannot specify pathnames with --stdin"));
+	} else {
+		if (nul_term_line)
+			die(_("-z only makes sense with --stdin"));
+		if (argc == 0)
+			die(_("no path specified"));
+	}
+	if (quiet) {
+		if (argc > 1)
+			die(_("--quiet is only valid with a single pathname"));
+		if (verbose)
+			die(_("cannot have both --quiet and --verbose"));
+	}
+	if (show_non_matching && !verbose)
+		die(_("--non-matching is only valid with --verbose"));
+
+	/* read_cache() is only necessary so we can watch out for submodules. */
+	if (!no_index && read_cache() < 0)
+		die(_("index file corrupt"));
+
+	memset(&dir, 0, sizeof(dir));
+	setup_standard_excludes(&dir);
+
+	if (stdin_paths) {
+		num_ignored = check_ignore_stdin_paths(&dir, prefix);
+	} else {
+		num_ignored = check_ignore(&dir, prefix, argc, argv);
+		maybe_flush_or_die(stdout, "ignore to stdout");
+	}
+
+	clear_directory(&dir);
+
+	return !num_ignored;
+}