meson: initial build conf

Not that well tested yet, does not support plugins-as-modules

bar/meson.build

@@ -0,0 +1,48 @@
+bar_backends = []
+
+# TODO: X11
+if enable_x11
+  bar_x11 = declare_dependency(sources: ['xcb.c', 'xcb.h'],
+                               dependencies: [xcb_stuff, cairo, cairo_ft])
+  bar_backends += [bar_x11]
+endif
+
+# TODO: conditional Wayland
+if enable_wayland
+  wayland_protocols = dependency('wayland-protocols')
+  wayland_protocols_datadir = wayland_protocols.get_pkgconfig_variable('pkgdatadir')
+
+  wscanner = dependency('wayland-scanner', native: true)
+  wscanner_prog = find_program(
+    wscanner.get_pkgconfig_variable('wayland_scanner'), native: true)
+
+  wayland_protocol_header = generator(
+    wscanner_prog,
+    output: '@BASENAME@.h',
+    arguments: ['client-header', '@INPUT@', '@OUTPUT@'])
+  wayland_protocol_source = generator(
+    wscanner_prog,
+    output: '@BASENAME@.c',
+    arguments: ['private-code', '@INPUT@', '@OUTPUT@'])
+
+  generated_wayland_protocols = []
+  foreach prot : [
+    '../external/wlr-protocols/unstable/wlr-layer-shell-unstable-v1.xml',
+    wayland_protocols_datadir + '/stable/xdg-shell/xdg-shell.xml',
+    wayland_protocols_datadir + '/unstable/xdg-output/xdg-output-unstable-v1.xml']
+
+    generated_wayland_protocols += [
+      wayland_protocol_header.process(prot),
+      wayland_protocol_source.process(prot)]
+  endforeach
+
+  bar_wayland = declare_dependency(
+    sources: ['wayland.c', 'wayland.h'] + generated_wayland_protocols,
+    dependencies: [wayland_client, wayland_cursor, cairo, cairo_ft])
+
+  bar_backends += [bar_wayland]
+endif
+
+bar = declare_dependency(
+  sources: ['bar.c', 'bar.h', 'private.h', 'backend.h'],
+  dependencies: bar_backends + [threads])