Generate app icons from SVG at build time

data/icons/meson.build

@@ -1,9 +1,24 @@
+icon_gen = find_program('generate_icons.py')
+find_program('magick', required: true)
+
 icondir = join_paths(get_option('datadir'), 'icons/hicolor')
-install_data(
-  'zoitechat.png',
-  rename: 'net.zoite.Zoitechat.png',
-  install_dir: join_paths(icondir, '48x48/apps')
+custom_target('zoitechat_png',
+  input: 'zoitechat.svg',
+  output: 'net.zoite.Zoitechat.png',
+  command: [icon_gen, '@INPUT@', '@OUTPUT@', '--size', '48'],
+  install: true,
+  install_dir: join_paths(icondir, '48x48/apps'),
 )
+
+if host_machine.system() == 'windows'
+  custom_target('zoitechat_ico',
+    input: 'zoitechat.svg',
+    output: 'zoitechat.ico',
+    command: [icon_gen, '@INPUT@', '@PRIVATE_DIR@/zoitechat.png', '--size', '48', '--ico', '@OUTPUT@'],
+    build_by_default: true,
+  )
+endif
+
 install_data(
   'zoitechat.svg',
   rename: 'net.zoite.Zoitechat.svg',