config: support rc.yaml

Based on @johanmalm's work.

This adds libyaml as an optional dependency.

t/meson.build

@@ -1,18 +1,37 @@
-test_lib = static_library(
-  'test_lib',
-  sources: files(
+test_lib_sources = files(
     '../src/common/buf.c',
     '../src/common/mem.c',
-    '../src/common/string-helpers.c'
-  ),
-  include_directories: [labwc_inc],
-  dependencies: [dep_cmocka],
+    '../src/common/string-helpers.c',
 )
 
+test_deps = [
+  dep_cmocka,
+]
+
 tests = [
   'buf-simple',
 ]
 
+if have_libyaml
+  test_lib_sources += [
+    '../src/common/yaml2xml.c',
+  ]
+  test_deps += [
+    wlroots,
+    yaml,
+  ]
+  tests += [
+    'yaml2xml',
+  ]
+endif
+
+test_lib = static_library(
+  'test_lib',
+  sources: test_lib_sources,
+  include_directories: [labwc_inc],
+  dependencies: test_deps
+)
+
 foreach t : tests
   test(
     'test_@0@'.format(t),

t/yaml2xml.c

@@ -0,0 +1,99 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#define _POSIX_C_SOURCE 200809L
+#include <setjmp.h>
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <string.h>
+#include <cmocka.h>
+#include "common/buf.h"
+#include "common/macros.h"
+#include "common/yaml2xml.h"
+
+struct test_set {
+	const char *name, *yaml, *xml;
+};
+
+const struct test_set test_sets[] = {
+	{
+		.name = "key-scalar",
+		.yaml = "xxx: yyy",
+		.xml = "<test><xxx>yyy</xxx></test>",
+	},
+	{
+		.name = "key-sequence",
+		.yaml = "xxx: [yyy, zzz]",
+		.xml = "<test><xxx>yyy</xxx><xxx>zzz</xxx></test>",
+	},
+	{
+		.name = "key-mapping",
+		.yaml = "xxx: {yyy: zzz}",
+		.xml = "<test><xxx><yyy>zzz</yyy></xxx></test>",
+	},
+	{
+		.name = "window-switcher-fields",
+		.yaml = "windowSwitcher: {fields: [xxx, yyy]}",
+		.xml =
+			"<test><windowSwitcher><fields>"
+				"<field>xxx</field>"
+				"<field>yyy</field>"
+			"</fields></windowSwitcher></test>",
+	},
+	{
+		.name = "theme-fonts",
+		.yaml = "theme: {fonts: [xxx, yyy]}",
+		.xml =
+			"<test><theme>"
+				"<font>xxx</font>"
+				"<font>yyy</font>"
+			"</theme></test>",
+	},
+	{
+		.name = "mousebinds",
+		.yaml =
+			"mousebinds:\n"
+        		"  - { button: W-Left,  action: Press, actions: [ { name: Raise }, { name: Move } ] }\n"
+			"  - { button: W-Right, action: Drag,  action: { name: Resize} }\n",
+		.xml =
+			"<test>"
+			"<mousebind>"
+				"<button>W-Left</button>"
+				"<action>Press</action>"
+				"<action><name>Raise</name></action>"
+				"<action><name>Move</name></action>"
+			"</mousebind>"
+			"<mousebind>"
+				"<button>W-Right</button>"
+				"<action>Drag</action>"
+				"<action><name>Resize</name></action>"
+			"</mousebind>"
+			"</test>",
+	},
+};
+
+static void
+test_yaml_to_xml(void **state)
+{
+	(void)state;
+	for (int i = 0; i < (int)ARRAY_SIZE(test_sets); i++) {
+		const struct test_set *set = &test_sets[i];
+
+		char buf[1024];
+		FILE *stream = fmemopen(buf, sizeof(buf), "w+");
+		fwrite(set->yaml, strlen(set->yaml), 1, stream);
+		fseek(stream, 0, SEEK_SET);
+
+		struct buf b = yaml_to_xml(stream, "test");
+		fclose(stream);
+		assert_string_equal(b.data, set->xml);
+	}
+}
+
+int main(int argc, char **argv)
+{
+	const struct CMUnitTest tests[] = {
+		cmocka_unit_test(test_yaml_to_xml),
+	};
+
+	return cmocka_run_group_tests(tests, NULL, NULL);
+}