Gate backlight module behind libudev availability

include/factory.hpp

@@ -16,10 +16,12 @@
 #ifdef HAVE_LIBNL
 #include "modules/network.hpp"
 #endif
+#ifdef HAVE_LIBUDEV
+#include "modules/backlight.hpp"
+#endif
 #ifdef HAVE_LIBPULSE
 #include "modules/pulseaudio.hpp"
 #endif
-#include "modules/backlight.hpp"
 #include "modules/custom.hpp"
 
 namespace waybar {

meson.build

@@ -55,7 +55,7 @@ sigcpp = dependency('sigc++-2.0')
 libnl = dependency('libnl-3.0', required: get_option('libnl'))
 libnlgen = dependency('libnl-genl-3.0', required: get_option('libnl'))
 libpulse = dependency('libpulse', required: get_option('pulseaudio'))
-libudev = dependency('libudev')
+libudev = dependency('libudev', required: get_option('libudev'))
 
 src_files = files(
     'src/factory.cpp',
@@ -65,7 +65,6 @@ src_files = files(
     'src/modules/clock.cpp',
     'src/modules/custom.cpp',
     'src/modules/cpu.cpp',
-    'src/modules/backlight.cpp',
     'src/main.cpp',
     'src/bar.cpp',
     'src/client.cpp'
@@ -101,6 +100,11 @@ if dbusmenu_gtk.found()
     )
 endif
 
+if libudev.found()
+    add_project_arguments('-DHAVE_LIBUDEV', language: 'cpp')
+    src_files += 'src/modules/backlight.cpp'
+endif
+
 subdir('protocol')
 
 executable(

meson_options.txt

@@ -1,4 +1,5 @@
 option('libnl', type: 'feature', value: 'auto', description: 'Enable libnl support for network related features')
+option('libudev', type: 'feature', value: 'auto', description: 'Enable libudev support for udev related features')
 option('pulseaudio', type: 'feature', value: 'auto', description: 'Enable support for pulseaudio')
 option('dbusmenu-gtk', type: 'feature', value: 'auto', description: 'Enable support for tray')
 option('out', type: 'string', value : '/', description: 'output prefix directory')

src/factory.cpp

@@ -43,14 +43,16 @@ waybar::IModule* waybar::Factory::makeModule(const std::string &name) const
       return new waybar::modules::Network(id, config_[name]);
     }
     #endif
+    #ifdef HAVE_LIBUDEV
+    if (ref == "backlight") {
+      return new waybar::modules::Backlight(id, config_[name]);
+    }
+    #endif
     #ifdef HAVE_LIBPULSE
     if (ref == "pulseaudio") {
       return new waybar::modules::Pulseaudio(id, config_[name]);
     }
     #endif
-    if (ref == "backlight") {
-      return new waybar::modules::Backlight(id, config_[name]);
-    }
     if (ref.compare(0, 7, "custom/") == 0 && ref.size() > 7) {
       return new waybar::modules::Custom(ref.substr(7), config_[name]);
     }