completions: add zsh completions

completions/meson.build

@@ -0,0 +1,2 @@
+zsh_install_dir = join_paths(get_option('datadir'), 'zsh/site-functions')
+install_data('zsh/_f00bar', install_dir: zsh_install_dir)

completions/zsh/_f00bar

@@ -0,0 +1,9 @@
+#compdef f00bar
+
+_arguments \
+    -s \
+    '(-v --version)'{-v,--version}'[show the version number and quit]' \
+    '(-h --help)'{-h,--help}'[show help message and quit]' \
+    '(-b --backend)'{-b,--backend}'[backend to use; xcb,wayland,auto (default: auto)]' \
+    '(-c --config)'{-c,--config}'[alternative configuration file]' \
+    '(-C --validate)'{-C,--validate}'[verify configuration then quit]'

meson.build

@@ -82,6 +82,7 @@ if backend_x11
   install_headers('xcb.h', subdir: 'f00bar')
 endif
 
+subdir('completions')
 subdir('doc')
 subdir('bar')
 subdir('decorations')