Merge branch 'jc/test-parse-options-expect'

t0040 had too many unnecessary repetitions in its test data.  Teach
test-parse-options program so that a caller can tell what it
expects in its output, so that these repetitions can be cleaned up.

* jc/test-parse-options-expect:
  t0040: convert a few tests to use test-parse-options --expect
  t0040: remove unused test helpers
  test-parse-options: --expect=<string> option to simplify tests
  test-parse-options: fix output when callback option fails

t/helper/test-parse-options.c

@@ -14,10 +14,18 @@ static char *file = NULL;
 static int ambiguous;
 static struct string_list list;
 
+static struct {
+	int called;
+	const char *arg;
+	int unset;
+} length_cb;
+
 static int length_callback(const struct option *opt, const char *arg, int unset)
 {
-	printf("Callback: \"%s\", %d\n",
-		(arg ? arg : "not set"), unset);
+	length_cb.called = 1;
+	length_cb.arg = arg;
+	length_cb.unset = unset;
+
 	if (unset)
 		return 1; /* do not support unset */
 
@@ -31,6 +39,61 @@ static int number_callback(const struct option *opt, const char *arg, int unset)
 	return 0;
 }
 
+static int collect_expect(const struct option *opt, const char *arg, int unset)
+{
+	struct string_list *expect;
+	struct string_list_item *item;
+	struct strbuf label = STRBUF_INIT;
+	const char *colon;
+
+	if (!arg || unset)
+		die("malformed --expect option");
+
+	expect = (struct string_list *)opt->value;
+	colon = strchr(arg, ':');
+	if (!colon)
+		die("malformed --expect option, lacking a colon");
+	strbuf_add(&label, arg, colon - arg);
+	item = string_list_insert(expect, strbuf_detach(&label, NULL));
+	if (item->util)
+		die("malformed --expect option, duplicate %s", label.buf);
+	item->util = (void *)arg;
+	return 0;
+}
+
+__attribute__((format (printf,3,4)))
+static void show(struct string_list *expect, int *status, const char *fmt, ...)
+{
+	struct string_list_item *item;
+	struct strbuf buf = STRBUF_INIT;
+	va_list args;
+
+	va_start(args, fmt);
+	strbuf_vaddf(&buf, fmt, args);
+	va_end(args);
+
+	if (!expect->nr)
+		printf("%s\n", buf.buf);
+	else {
+		char *colon = strchr(buf.buf, ':');
+		if (!colon)
+			die("malformed output format, output lacking colon: %s", fmt);
+		*colon = '\0';
+		item = string_list_lookup(expect, buf.buf);
+		*colon = ':';
+		if (!item)
+			; /* not among entries being checked */
+		else {
+			if (strcmp((const char *)item->util, buf.buf)) {
+				printf("-%s\n", (char *)item->util);
+				printf("+%s\n", buf.buf);
+				*status = 1;
+			}
+		}
+	}
+	strbuf_release(&buf);
+}
+
 int main(int argc, char **argv)
 {
 	const char *prefix = "prefix/";
@@ -38,6 +101,7 @@ int main(int argc, char **argv)
 		"test-parse-options <options>",
 		NULL
 	};
+	struct string_list expect = STRING_LIST_INIT_NODUP;
 	struct option options[] = {
 		OPT_BOOL(0, "yes", &boolean, "get a boolean"),
 		OPT_BOOL('D', "no-doubt", &boolean, "begins with 'no-'"),
@@ -78,28 +142,38 @@ int main(int argc, char **argv)
 		OPT__VERBOSE(&verbose, "be verbose"),
 		OPT__DRY_RUN(&dry_run, "dry run"),
 		OPT__QUIET(&quiet, "be quiet"),
+		OPT_CALLBACK(0, "expect", &expect, "string",
+			     "expected output in the variable dump",
+			     collect_expect),
 		OPT_END(),
 	};
 	int i;
+	int ret = 0;
 
 	argc = parse_options(argc, (const char **)argv, prefix, options, usage, 0);
 
-	printf("boolean: %d\n", boolean);
-	printf("integer: %d\n", integer);
-	printf("magnitude: %lu\n", magnitude);
-	printf("timestamp: %lu\n", timestamp);
-	printf("string: %s\n", string ? string : "(not set)");
-	printf("abbrev: %d\n", abbrev);
-	printf("verbose: %d\n", verbose);
-	printf("quiet: %d\n", quiet);
-	printf("dry run: %s\n", dry_run ? "yes" : "no");
-	printf("file: %s\n", file ? file : "(not set)");
+	if (length_cb.called) {
+		const char *arg = length_cb.arg;
+		int unset = length_cb.unset;
+		show(&expect, &ret, "Callback: \"%s\", %d",
+		     (arg ? arg : "not set"), unset);
+	}
+	show(&expect, &ret, "boolean: %d", boolean);
+	show(&expect, &ret, "integer: %d", integer);
+	show(&expect, &ret, "magnitude: %lu", magnitude);
+	show(&expect, &ret, "timestamp: %lu", timestamp);
+	show(&expect, &ret, "string: %s", string ? string : "(not set)");
+	show(&expect, &ret, "abbrev: %d", abbrev);
+	show(&expect, &ret, "verbose: %d", verbose);
+	show(&expect, &ret, "quiet: %d", quiet);
+	show(&expect, &ret, "dry run: %s", dry_run ? "yes" : "no");
+	show(&expect, &ret, "file: %s", file ? file : "(not set)");
 
 	for (i = 0; i < list.nr; i++)
-		printf("list: %s\n", list.items[i].string);
+		show(&expect, &ret, "list: %s", list.items[i].string);
 
 	for (i = 0; i < argc; i++)
-		printf("arg %02d: %s\n", i, argv[i]);
+		show(&expect, &ret, "arg %02d: %s", i, argv[i]);
 
-	return 0;
+	return ret;
 }

t/t0040-parse-options.sh

@@ -45,6 +45,7 @@ Standard options
     -v, --verbose         be verbose
     -n, --dry-run         dry run
     -q, --quiet           be quiet
+    --expect <string>     expected output in the variable dump
 
 EOF
 
@@ -56,52 +57,12 @@ test_expect_success 'test help' '
 
 mv expect expect.err
 
-cat >expect.template <<\EOF
-boolean: 0
-integer: 0
-magnitude: 0
-timestamp: 0
-string: (not set)
-abbrev: 7
-verbose: -1
-quiet: 0
-dry run: no
-file: (not set)
-EOF
-
-check() {
+check () {
 	what="$1" &&
 	shift &&
 	expect="$1" &&
 	shift &&
-	sed "s/^$what .*/$what $expect/" <expect.template >expect &&
-	test-parse-options $* >output 2>output.err &&
-	test_must_be_empty output.err &&
-	test_cmp expect output
-}
-
-check_i18n() {
-	what="$1" &&
-	shift &&
-	expect="$1" &&
-	shift &&
-	sed "s/^$what .*/$what $expect/" <expect.template >expect &&
-	test-parse-options $* >output 2>output.err &&
-	test_must_be_empty output.err &&
-	test_i18ncmp expect output
-}
-
-check_unknown() {
-	case "$1" in
-	--*)
-		echo error: unknown option \`${1#--}\' >expect ;;
-	-*)
-		echo error: unknown switch \`${1#-}\' >expect ;;
-	esac &&
-	cat expect.err >>expect &&
-	test_must_fail test-parse-options $* >output 2>output.err &&
-	test_must_be_empty output &&
-	test_cmp expect output.err
+	test-parse-options --expect="$what $expect" "$@"
 }
 
 check_unknown_i18n() {
@@ -356,9 +317,7 @@ test_expect_success 'OPT_CALLBACK() and OPT_BIT() work' '
 	test_cmp expect output
 '
 
-cat >expect <<\EOF
-Callback: "not set", 1
-EOF
+>expect
 
 test_expect_success 'OPT_CALLBACK() and callback errors work' '
 	test_must_fail test-parse-options --no-length >output 2>output.err &&