Make libmpdclient an optional dependency

Without this change yambar can't be installed/used without libmpdclient even for
people who do not use MPD. Let's make this optional.

We could put the optional module summary in the module meson.build but we'd have
to move summary() in main meson.build so that they appear in proper order.

CHANGELOG.md

@@ -11,6 +11,9 @@
 ## Unreleased
 ### Added
 ### Changed
+
+* Made `libmpdclient` an optional dependency
+
 ### Deprecated
 ### Removed
 ### Fixed
@@ -22,6 +25,7 @@
 ### Security
 ### Contributors
 
+* [sochotnicky](https://codeberg.org/sochotnicky)
 
 ## 1.7.0
 

meson.build

@@ -119,6 +119,7 @@ yambar = executable(
   version,
   dependencies: [bar, pixman, yaml, threads, dl, tllist, fcft] +
                 decorations + particles + modules,
+  c_args: [plugin_mpd_enabled? '-DPLUGIN_ENABLED_MPD':[]],
   build_rpath: '$ORIGIN/modules:$ORIGIN/decorations:$ORIGIN/particles',
   export_dynamic: true,
   install: true,
@@ -153,3 +154,9 @@ summary(
   },
   bool_yn: true
 )
+
+summary(
+  {'Music Player Daemon (MPD)': plugin_mpd_enabled},
+  section: 'Optional modules',
+  bool_yn: true
+)

meson_options.txt

@@ -5,3 +5,6 @@ option(
 option(
   'core-plugins-as-shared-libraries', type: 'boolean', value: false,
   description: 'Compiles modules, particles and decorations as shared libraries, which are loaded on-demand')
+option(
+  'plugin-mpd', type: 'feature', value: 'auto',
+  description: 'Music Player Daemon (MPD) support')

modules/meson.build

@@ -5,9 +5,12 @@ modules = []
 alsa = dependency('alsa')
 udev = dependency('libudev')
 json = dependency('json-c')
-mpd = dependency('libmpdclient')
 xcb_xkb = dependency('xcb-xkb', required: get_option('backend-x11'))
 
+# Optional deps
+mpd = dependency('libmpdclient', required: get_option('plugin-mpd'))
+plugin_mpd_enabled = mpd.found()
+
 # Module name -> (source-list, dep-list)
 mod_data = {
   'alsa': [[], [m, alsa]],
@@ -16,13 +19,16 @@ mod_data = {
   'clock': [[], []],
   'i3': [['i3-common.c', 'i3-common.h'], [dynlist, json]],
   'label': [[], []],
-  'mpd': [[], [mpd]],
   'network': [[], []],
   'removables': [[], [dynlist, udev]],
   'script': [[], []],
   'sway-xkb': [['i3-common.c', 'i3-common.h'], [dynlist, json]],
 }
 
+if plugin_mpd_enabled
+  mod_data += {'mpd': [[], [mpd]]}
+endif
+
 if backend_x11
   mod_data += {
     'xkb': [[], [xcb_stuff, xcb_xkb]],

plugin.c

@@ -39,7 +39,9 @@ EXTERN_MODULE(clock);
 EXTERN_MODULE(foreign_toplevel);
 EXTERN_MODULE(i3);
 EXTERN_MODULE(label);
+#if defined(PLUGIN_ENABLED_MPD)
 EXTERN_MODULE(mpd);
+#endif
 EXTERN_MODULE(network);
 EXTERN_MODULE(removables);
 EXTERN_MODULE(river);
@@ -117,7 +119,9 @@ init(void)
 #endif
     REGISTER_CORE_MODULE(i3, i3);
     REGISTER_CORE_MODULE(label, label);
+#if defined(PLUGIN_ENABLED_MPD)
     REGISTER_CORE_MODULE(mpd, mpd);
+#endif
     REGISTER_CORE_MODULE(network, network);
     REGISTER_CORE_MODULE(removables, removables);
 #if defined(HAVE_PLUGIN_river)