wayland module: Allow building both client and server sides

- Change `scope` kwarg to `public` boolean default to false.
- Change `side`  kwarg to `client` and `server` booleans.
- Document returned values
- Aggregate in a single unit test because have lots of small tests
  increases CI time.

Fixes: #10040.

docs/markdown/Wayland-module.md

@@ -26,7 +26,6 @@ executable('hw', 'main.c', xdg_shell, dependencies : wl_dep)
 ## Methods
 
 ### find_protocol
-
 ```meson
 xml = wl_mod.find_protocol(
   'xdg-decoration',
@@ -35,28 +34,37 @@ xml = wl_mod.find_protocol(
 )
 ```
 This function requires one positional argument: the protocol base name.
+
+It takes the following keyword arguments:
 - `state` Optional arg that specifies the current state of the protocol.
-Either stable, staging, or unstable.
-The default is stable.
-- `version` The backwards incompatible version number.
-Required for staging or unstable. An error is raised for stable.
+  Either `'stable'`, `'staging'`, or `'unstable'`. The default is `'stable'`.
+- `version` The backwards incompatible version number as integer.
+  Required for staging and unstable, but not allowed for stable.
+
+**Returns**: a [[@file]] that can be passed to [scan_xml](#scan_xml)
 
 ### scan_xml
 ```meson
 generated = wl_mod.scan_xml(
   'my-protocol.xml',
-  side : 'client',
-  scope : 'private',
+  client : true,
+  server : true,
+  public : false,
 )
 ```
 This function accepts one or more arguments of either string or file type.
 
-- `side` Optional arg that specifies if client or server side code is generated.
-The default is client side.
-- `scope` Optional arg that specifies the scope of the generated code.
-Either public or private.
-The default is private.
+It takes the following keyword arguments:
+- `public` Optional arg that specifies the scope of the generated code.
+  The default is false.
+- `client` Optional arg that specifies if client side header file is
+  generated. The default is true.
+- `server` Optional arg that specifies if server side header file is
+  generated. The default is false.
 
+**Returns**: a list of [[@custom_tgt]] in the order source, client side header,
+server side header. Generated header files have the name
+`<name>-<client|server>-protocol.h`.
 
 ## Links
 - [Official Wayland Documentation](https://wayland.freedesktop.org/docs/html/)

mesonbuild/modules/unstable_wayland.py

@@ -39,15 +39,18 @@ class WaylandModule(ExtensionModule):
     @typed_pos_args('wayland.scan_xml', varargs=(str, File), min_varargs=1)
     @typed_kwargs(
         'wayland.scan_xml',
-        KwargInfo('side', str, default='client', validator=in_set_validator({'client', 'server'})),
-        KwargInfo('scope', str, default='private', validator=in_set_validator({'private', 'public'})),
+        KwargInfo('public', bool, default=False),
+        KwargInfo('client', bool, default=True),
+        KwargInfo('server', bool, default=False),
     )
     def scan_xml(self, state, args, kwargs):
         if self.scanner_bin is None:
             self.scanner_bin = state.find_program('wayland-scanner', for_machine=MachineChoice.BUILD)
 
-        scope = kwargs['scope']
-        side = kwargs['side']
+        scope = 'public' if kwargs['public'] else 'private'
+        sides = [i for i in ['client', 'server'] if kwargs[i]]
+        if not sides:
+            raise MesonException('At least one of client or server keyword argument must be set to true.')
 
         xml_files = self.interpreter.source_strings_to_files(args[0])
         targets = []
@@ -65,6 +68,7 @@ class WaylandModule(ExtensionModule):
             )
             targets.append(code)
 
+            for side in sides:
                 header = CustomTarget(
                     f'{name}-{side}-protocol',
                     state.subdir,

test cases/wayland/1 client/both.c

@@ -0,0 +1,11 @@
+#include "viewporter-client-protocol.h"
+#include "viewporter-server-protocol.h"
+
+int main() {
+#if defined(VIEWPORTER_CLIENT_PROTOCOL_H) &&                                   \
+    defined(VIEWPORTER_SERVER_PROTOCOL_H)
+  return 0;
+#else
+  return 1;
+#endif
+}

test cases/wayland/1 client/meson.build

@@ -5,12 +5,44 @@ if not wl_protocols_dep.found()
   error('MESON_SKIP_TEST: wayland-protocols not installed')
 endif
 
-wl_dep = dependency('wayland-client')
+wl_client_dep = dependency('wayland-client')
+wl_server_dep = dependency('wayland-server')
 wl_mod = import('unstable-wayland')
+fs = import('fs')
 
+# Client side only
 xdg_shell_xml = wl_mod.find_protocol('xdg-shell')
 xdg_shell = wl_mod.scan_xml(xdg_shell_xml)
+assert(xdg_shell.length() == 2)
+assert(fs.name(xdg_shell[0].full_path()) == 'xdg-shell-protocol.c')
+assert(fs.name(xdg_shell[1].full_path()) == 'xdg-shell-client-protocol.h')
+exe = executable('client', 'client.c', xdg_shell, dependencies : wl_client_dep)
+test('client', exe)
 
-exe = executable('client', 'main.c', xdg_shell, dependencies : wl_dep)
+# Server side only
+presentation_time_xml = wl_mod.find_protocol('presentation-time')
+presentation_time = wl_mod.scan_xml(presentation_time_xml, client : false, server : true)
+assert(presentation_time.length() == 2)
+assert(fs.name(presentation_time[0].full_path()) == 'presentation-time-protocol.c')
+assert(fs.name(presentation_time[1].full_path()) == 'presentation-time-server-protocol.h')
+exe = executable('server', 'server.c', presentation_time, dependencies : wl_server_dep)
+test('server', exe)
 
-test('client', exe)
+# Both sides
+viewporter_xml = wl_mod.find_protocol('viewporter')
+viewporter = wl_mod.scan_xml(viewporter_xml, client : true, server : true)
+assert(viewporter.length() == 3)
+assert(fs.name(viewporter[0].full_path()) == 'viewporter-protocol.c')
+assert(fs.name(viewporter[1].full_path()) == 'viewporter-client-protocol.h')
+assert(fs.name(viewporter[2].full_path()) == 'viewporter-server-protocol.h')
+exe = executable('both', 'both.c', viewporter, dependencies : [wl_client_dep, wl_server_dep])
+test('both', exe)
+
+# Local xml
+xmls = files('test.xml')
+gen = wl_mod.scan_xml(xmls)
+assert(gen.length() == 2)
+assert(fs.name(gen[0].full_path()) == 'test-protocol.c')
+assert(fs.name(gen[1].full_path()) == 'test-client-protocol.h')
+exe = executable('local', 'local.c', gen, dependencies : wl_client_dep)
+test('local', exe)

test cases/wayland/1 client/server.c

@@ -0,0 +1,9 @@
+#include "presentation-time-server-protocol.h"
+
+int main() {
+#ifdef PRESENTATION_TIME_SERVER_PROTOCOL_H
+  return 0;
+#else
+  return 1;
+#endif
+}

test cases/wayland/2 server/main.c

@@ -1,9 +0,0 @@
-#include "xdg-shell-server-protocol.h"
-
-int main() {
-#ifdef XDG_SHELL_SERVER_PROTOCOL_H
-    return 0;
-#else
-    return 1;
-#endif
-}

test cases/wayland/2 server/meson.build

@@ -1,16 +0,0 @@
-project('wayland-test-server', 'c')
-
-wl_protocols_dep = dependency('wayland-protocols', required : false)
-if not wl_protocols_dep.found()
-  error('MESON_SKIP_TEST: wayland-protocols not installed')
-endif
-
-wl_dep = dependency('wayland-server')
-wl_mod = import('unstable-wayland')
-
-xdg_shell_xml = wl_mod.find_protocol('xdg-shell')
-xdg_shell = wl_mod.scan_xml(xdg_shell_xml, side : 'server')
-
-exe = executable('server', 'main.c', xdg_shell, dependencies : wl_dep)
-
-test('client', exe)

test cases/wayland/3 local/meson.build

@@ -1,11 +0,0 @@
-project('wayland-test-local', 'c')
-
-wl_dep = dependency('wayland-client')
-wl_mod = import('unstable-wayland')
-
-xmls = files('test.xml')
-gen = wl_mod.scan_xml(xmls)
-
-exe = executable('local', 'main.c', gen, dependencies : wl_dep)
-
-test('local', exe)