nvim: plugins: Drop AnsiEsc and add a simpler replacement

Sanitises buffer by removing ANSI codes.

Idea taken from
https://www.reddit.com/r/neovim/comments/qqf4nn/comment/hk1nwnk
https://superuser.com/questions/1445805/removing-ansi-color-codes-from-a-text-file-in-vi

nvim/.config/nvim/lua/plugins.lua

@@ -131,11 +131,6 @@ local init = function ()
   use {
     'chentau/marks.nvim',
   }
-  -- For files with ANSI escape sequences
-  use {
-    'powerman/vim-plugin-AnsiEsc',
-    cmd = 'AnsiEsc'
-  }
 end
 
 return require('packer').startup(init)

nvim/.config/nvim/plugin/ansiesc.vim

@@ -0,0 +1,16 @@
+function! DeleteAnsiColorCodes()
+  set modifiable
+  set noconfirm
+  " Clean ascii/ansi code  (starts with ^[)
+  silent! %s/\e\[[0-9:;]*m//g
+  silent! %s/[^[:alnum:][:punct:][:space:]]//g
+  silent! %s/\e\[[^\s]*\s//g
+  " Remove empty spaces from end
+  silent! %s/\s*$//
+  let @/ = ""
+  set rnu
+  " Map q to force quit
+  cnoremap q q!
+endfunction
+
+command! AnsiEsc call DeleteAnsiColorCodes()