nu: use carapace for completion (if found), add nocaps alias

shell/.config/nushell/config.nu

@@ -137,9 +137,11 @@ let light_theme = {
 }
 
 # External completer example
-# let carapace_completer = {|spans|
-#     carapace $spans.0 nushell $spans | from json
-# }
+let carapace_completer = if (which carapace | is-empty) {
+    null
+} else {
+    {|spans| carapace $spans.0 nushell ...$spans | from json}
+}
 
 # The default config record. This is where much of your global configuration is setup.
 $env.config = {
@@ -210,7 +212,7 @@ $env.config = {
         external: {
             enable: true # set to false to prevent nushell looking into $env.PATH to find more suggestions, `false` recommended for WSL users as this look up may be very slow
             max_results: 100 # setting it lower can improve completion performance at the cost of omitting some options
-            completer: null # check 'carapace_completer' above as an example
+            completer: $carapace_completer
         }
     }
 
@@ -814,6 +816,7 @@ alias v = nvim
 alias tl = tmux list-sessions
 alias tn = tmux new -s
 alias ta = tmux attach -t
+alias nocaps = setxkbmap pl -option ctrl:nocaps
 
 def gst [] {
     git status -s | detect columns -n | rename status file