completion: use pkg-config to get install location for bash/fish

Both shells provide pkg-config files which declare their designated
completionsdir. Use this as the primary source of truth.

1 files changed, 12 insertions, 2 deletions

diff --git a/meson.build b/meson.build
index 6efff3ed..ca0c791f 100644
--- a/meson.build
+++ b/meson.build
@@ -54,6 +54,8 @@ libinput       = dependency('libinput', version: '>=1.6.0')
 systemd        = dependency('libsystemd', version: '>=239', required: false)
 elogind        = dependency('libelogind', version: '>=239', required: false)
 xcb            = dependency('xcb', required: get_option('xwayland'))
+bash_comp      = dependency('bash-completion', required: false)
+fish_comp      = dependency('fish', required: false)
 math           = cc.find_library('m')
 rt             = cc.find_library('rt')
 
@@ -260,7 +262,11 @@ if get_option('bash-completions')
                 'completions/bash/swaybar',
                 'completions/bash/swaymsg',
         )
-        bash_install_dir = join_paths(datadir, 'bash-completion', 'completions')
+        if bash_comp.found()
+                bash_install_dir = bash_comp.get_pkgconfig_variable('completionsdir')
+        else
+                bash_install_dir = join_paths(datadir, 'bash-completion', 'completions')
+        endif
 
         install_data(bash_files, install_dir: bash_install_dir)
 endif
@@ -271,7 +277,11 @@ if get_option('fish-completions')
                 'completions/fish/swaymsg.fish',
                 'completions/fish/swaynag.fish',
         )
-        fish_install_dir = join_paths(datadir, 'fish', 'completions')
+        if fish_comp.found()
+                fish_install_dir = fish_comp.get_pkgconfig_variable('completionsdir')
+        else
+                fish_install_dir = join_paths(datadir, 'fish', 'completions')
+        endif
 
         install_data(fish_files, install_dir: fish_install_dir)
 endif