build: optionally install systemd service

If using a systemd based distro, it is useful to have the service file
installed so that it properly integrates with the service manager.
Certain distros are carrying around patches that accomplish this.

Author: LaserEyess

.builds/alpine.yml

@@ -13,7 +13,7 @@ sources:
 tasks:
   - setup: |
       cd mako
-      meson build/ -Dauto_features=enabled -Dsd-bus-provider=libelogind
+      meson build/ -Dauto_features=enabled -Dsd-bus-provider=libelogind -Dsystemd=disabled
   - build: |
       cd mako
       ninja -C build/

.builds/freebsd.yml

@@ -15,7 +15,7 @@ sources:
 tasks:
   - setup: |
       cd mako
-      meson build/ -Dauto_features=enabled -Dsd-bus-provider=basu
+      meson build/ -Dauto_features=enabled -Dsd-bus-provider=basu -Dsystemd=disabled
   - build: |
       cd mako
       ninja -C build/

fr.emersion.mako.service.in

@@ -1,3 +1,4 @@
 [D-BUS Service]
 Name=org.freedesktop.Notifications
 Exec=@bindir@/mako
+@systemd_service@

meson.build

@@ -108,6 +108,20 @@ executable(
 
 conf_data = configuration_data()
 conf_data.set('bindir', get_option('prefix') / get_option('bindir'))
+conf_data.set('systemd_service', '')
+
+systemd = dependency('systemd', required: get_option('systemd'))
+if systemd.found()
+	service_file = 'mako.service'
+	user_unit_dir = systemd.get_variable(pkgconfig: 'systemduserunitdir',
+		pkgconfig_define: ['prefix', get_option('prefix')])
+	conf_data.set('systemd_service', 'SystemdService=' + service_file)
+
+	install_data(
+		'contrib' / 'systemd' / service_file,
+		install_dir: user_unit_dir
+	)
+endif
 
 configure_file(
 	configuration: conf_data,

meson_options.txt

@@ -4,3 +4,4 @@ option('man-pages', type: 'feature', value: 'auto', description: 'Generate and i
 option('fish-completions', type: 'boolean', value: false, description: 'Install fish completions')
 option('zsh-completions', type: 'boolean', value: false, description: 'Install zsh completions')
 option('bash-completions', type: 'boolean', value: false, description: 'Install bash completions')
+option('systemd', type: 'feature', value: 'auto', description: 'Install systemd user service unit')