Update meson installer

- Add systemd unit, installed by default
- Don't install dbus service by default

data/com.feralinteractive.GameMode.service.in

@@ -1,3 +1,4 @@
 [D-BUS Service]
 Name=com.feralinteractive.GameMode
 Exec=@bindir@/tunedmode
+@DBUS_SYSTEMD_SERVICE@

data/tunedmode.service.in

@@ -0,0 +1,12 @@
+[Unit]
+Description=GameMode to Tuned wrapper service
+Requires=dbus.service
+Conflicts=gamemoded.service
+
+[Service]
+Type=dbus
+BusName=com.feralinteractive.GameMode
+ExecStart=@bindir@/tunedmode
+
+[Install]
+WantedBy=default.target

meson.build

@@ -14,6 +14,21 @@ datadir = join_paths(get_option('prefix'), get_option('datadir'))
 conf = configuration_data()
 conf.set('bindir', bindir)
 
+if get_option('systemd').enabled()
+  conf.set('DBUS_SYSTEMD_SERVICE', 'SystemdService=tunedmode.service')
+else
+  conf.set('DBUS_SYSTEMD_SERVICE', '')
+endif
+
+systemd = dependency('systemd', required: get_option('systemd').enabled())
+if get_option('systemd_user_unit_dir') != ''
+  user_unit_dir = get_option('systemd_user_unit_dir')
+elif systemd.found()
+  user_unit_dir = systemd.get_pkgconfig_variable('systemd_user_unit_dir')
+else
+  user_unit_dir = join_paths(get_option('prefix'), 'lib', 'systemd', 'user')
+endif
+
 python.install_sources('tunedmode.py', pure: true)
 
 configure_file(
@@ -24,9 +39,18 @@ configure_file(
   install_mode: 'rwxr-xr-x'
 )
 
+configure_file(
+  input: 'data/tunedmode.service.in',
+  output: 'tunedmode.service',
+  configuration: conf,
+  install: get_option('systemd').enabled(),
+  install_dir: user_unit_dir,
+)
+
 configure_file(
   input: 'data/com.feralinteractive.GameMode.service.in',
   output: 'com.feralinteractive.GameMode.service',
   configuration: conf,
-  install_dir: join_paths(datadir, 'dbus-1', 'services')
+  install: get_option('dbus_activation').enabled(),
+  install_dir: join_paths(datadir, 'dbus-1', 'services'),
 )

meson_options.txt

@@ -0,0 +1,3 @@
+option('systemd', type : 'feature', value : 'enabled')
+option('systemd_user_unit_dir', type : 'string')
+option('dbus_activation', type : 'feature', value : 'disabled')