kakoune: add dhall lint and format

hosts/default.nix

@@ -39,7 +39,8 @@ let
           nixpkgs.overlays = [
             (final: prev:
               with unstablePkgs; {
-                inherit starship element-desktop discord signal-desktop mpv;
+                inherit starship element-desktop discord signal-desktop mpv
+                  dhall;
               })
           ];
         };

profiles/develop/kakoune/default.nix

@@ -10,6 +10,7 @@
     python3Packages.python-language-server
     rustup
     nix-linter
+    dhall
   ];
 
   environment.etc = {

profiles/develop/kakoune/lint/dhall.kak

@@ -0,0 +1,9 @@
+hook -group lint global WinSetOption filetype=dhall %{
+  set buffer lintcmd '/etc/xdg/kak/autoload/lint/dhall.sh $1'
+  lint-enable
+  set buffer formatcmd "dhall format"
+  hook buffer BufWritePre .* %{
+    format
+    lint
+  }
+}

profiles/develop/kakoune/lint/dhall.sh

@@ -0,0 +1,13 @@
+#!/usr/bin/env zsh
+
+dhall lint --inplace $1 2>&1 | < /dev/stdin > /tmp/lint.out
+if head -2 /tmp/lint.out | grep Error &> /dev/null; then
+  sed -n 4p /tmp/lint.out | tr '\n' ' '
+  sed -n 2p /tmp/lint.out | tr 'E' 'e' | tr '\n' ';' \
+  | sed -r "s/\x1B\[([0-9]{1,2}(;[0-9]{1,2})?)?[m|K]//g"
+
+  awk 'NR>7 {printf " %s", $0}' /tmp/lint.out
+else
+  true
+fi
+rm -f /tmp/lint.out