build: Support the meson build system

Meson is on track to replace autotools as the build system of choice,
so support it in addition to autotools. If all goes well, we'll
eventually be able to drop the latter ...

https://bugzilla.gnome.org/show_bug.cgi?id=783229

data/meson.build

@@ -0,0 +1,87 @@
+desktop_files = [
+  'org.gnome.Shell.desktop',
+  'gnome-shell-extension-prefs.desktop'
+]
+service_files = []
+
+if have_networkmanager
+  desktop_files += 'org.gnome.Shell.PortalHelper.desktop'
+  service_files += 'org.gnome.Shell.PortalHelper.service'
+endif
+
+desktopconf = configuration_data()
+# We substitute in bindir so it works as an autostart
+# file when built in a non-system prefix
+desktopconf.set('bindir', bindir)
+desktopconf.set('VERSION', meson.project_version())
+foreach desktop_file : desktop_files
+  i18n.merge_file('desktop',
+    input: configure_file(
+      input: desktop_file + '.in.in',
+      output: desktop_file + '.in',
+      configuration: desktopconf
+    ),
+    output: desktop_file,
+    po_dir: '../po',
+    install: true,
+    install_dir: desktopdir,
+    type: 'desktop'
+  )
+endforeach
+
+serviceconf = configuration_data()
+serviceconf.set('libexecdir', libexecdir)
+foreach service_file : service_files
+  configure_file(
+    input: service_file + '.in',
+    output: service_file,
+    configuration: serviceconf,
+    install_dir: servicedir
+  )
+endforeach
+
+
+dbus_interfaces = [
+  'org.gnome.Shell.PadOsd.xml',
+  'org.gnome.Shell.Screencast.xml',
+  'org.gnome.Shell.Screenshot.xml',
+  'org.gnome.ShellSearchProvider.xml',
+  'org.gnome.ShellSearchProvider2.xml'
+]
+install_data(dbus_interfaces, install_dir: ifacedir)
+
+
+subdir('theme')
+
+theme_resources = gnome.compile_resources(
+  'gnome-shell-theme', 'gnome-shell-theme.gresource.xml',
+  source_dir: 'theme',
+  dependencies: theme_deps,
+  gresource_bundle: true,
+  install: true,
+  install_dir: pkgdatadir
+)
+
+perfconf = configuration_data()
+perfconf.set('datadir', datadir)
+configure_file(
+  input: 'perf-background.xml.in',
+  output: 'perf-background.xml',
+  configuration: perfconf,
+  install_dir: pkgdatadir
+)
+
+
+install_data('50-gnome-shell-system.xml', install_dir: keysdir)
+
+
+schemaconf = configuration_data()
+schemaconf.set('GETTEXT_PACKAGE', meson.project_name())
+configure_file(
+  input: 'org.gnome.shell.gschema.xml.in',
+  output: 'org.gnome.shell.gschema.xml',
+  configuration: schemaconf,
+  install_dir: schemadir
+)
+
+install_data('gnome-shell-overrides.convert', install_dir: convertdir)

data/theme/meson.build

@@ -0,0 +1,21 @@
+theme_sources = files([
+  'gnome-shell-high-contrast.scss',
+  'gnome-shell.scss',
+  'gnome-shell-sass/_colors.scss',
+  'gnome-shell-sass/_common.scss',
+  'gnome-shell-sass/_drawing.scss',
+  'gnome-shell-sass/_high-contrast-colors.scss'
+])
+
+theme_deps = []
+
+if sassc.found()
+  parse_sass = files('parse-sass.sh')
+
+  theme_deps += custom_target('update-theme',
+    output: 'theme-update.stamp',
+    depend_files: theme_sources,
+    command: [parse_sass, '@OUTPUT@'],
+    build_by_default: true
+  )
+endif

data/theme/parse-sass.sh

@@ -1,7 +1,10 @@
 #!/usr/bin/sh
 
 srcdir=`dirname $0`
+stamp=${1}
 for scss in $srcdir/*.scss
 do
-  sassc -a $scss ${scss%%.scss}.css
+  sassc -a $scss ${scss%%.scss}.css || exit 1
 done
+
+[ "$stamp" ] && touch $stamp