kakoune: fix nix linting by using nix-linter

profiles/develop/kakoune/default.nix

@@ -9,6 +9,7 @@
     nixfmt
     python3Packages.python-language-server
     rustup
+    nix-linter
   ];
 
   environment.etc = {

profiles/develop/kakoune/lint/nix.kak

@@ -2,15 +2,7 @@ hook -group lint global WinSetOption filetype=nix %{
   # remove '' for nix, annoying for string literals
   set buffer auto_pairs ( ) { } [ ] '"' '"' ` `
 
-  set buffer lintcmd '
-    run () {
-      nix-instantiate --parse $1 2>&1 >&- > /dev/null |
-      awk ''
-        {printf $NF ":" " "}
-        !($NF="") !($(NF-1)="") {sub(/,  $/, "")}1
-      ''
-    } && run \
-  '
+  set buffer lintcmd '/etc/xdg/kak/autoload/lint/nix.sh $1'
   lint-enable
   set buffer formatcmd "nixfmt"
   hook buffer BufWritePre .* %{

profiles/develop/kakoune/lint/nix.sh

@@ -0,0 +1,13 @@
+#!/usr/bin/env zsh
+
+nix-linter $1 2>&1 | < /dev/stdin > /tmp/lint.out
+if head -1 /tmp/lint.out | grep Failure &> /dev/null; then
+  sed -n 2p /tmp/lint.out | tr '\n' ' '
+  printf "error: "
+  awk 'NR>5 {printf "%s; ", $0}' /tmp/lint.out
+else
+  awk '{$(NF-1)=""; print $NF ": warning: " $0}' /tmp/lint.out > /tmp/lint.2
+  awk '{$NF="";gsub(/-[0-9]*:[0-9]*:*/, ":"); print $0}' /tmp/lint.2
+fi
+rm -f /tmp/lint.out
+rm -f /tmp/lint.2