refactor: Prefer single quoted strings

Author: alerque

autoload/indent_guides.vim

@@ -191,7 +191,7 @@ function! indent_guides#init_script_vars() abort
   let s:hi_normal   = indent_guides#capture_highlight('Normal')
 
   " remove 'font=<value>' from the s:hi_normal string (only seems to happen on Vim startup in Windows)
-  let s:hi_normal = substitute(s:hi_normal, ' font=[A-Za-z0-9:]\+', "", "")
+  let s:hi_normal = substitute(s:hi_normal, ' font=[A-Za-z0-9:]\+', '', '')
 
   " shortcuts to the global variables - this makes the code easier to read
   let s:debug             = g:indent_guides_debug
@@ -247,10 +247,10 @@ endfunction
 "
 function! indent_guides#capture_highlight(group_name) abort
   redir => l:output
-  exe "silent hi " . a:group_name
+  exe 'silent hi ' . a:group_name
   redir END
 
-  let l:output = substitute(l:output, "\n", "", "")
+  let l:output = substitute(l:output, '\n', '', '')
   return l:output
 endfunction
 

plugin/indent_guides.vim

@@ -35,7 +35,7 @@ command! -bar IndentGuidesDisable call s:IndentGuidesDisable()
 "
 function s:InitVariable(var, value)
   if !exists(a:var)
-    if type(a:value) == type("")
+    if type(a:value) == type('')
       exec 'let ' . a:var . ' = ' . "'" . a:value . "'"
     else
       exec 'let ' . a:var . ' = ' .  a:value