From a9dbfe5f5bfa91041c9505c728d3f6f8b0883713 Mon Sep 17 00:00:00 2001
From: "John.Koepi" <john.koepi@gmail.com>
Date: Sat, 7 Jan 2017 23:09:05 +0200
Subject: [PATCH] Added support for Stack based context GHC lookup

---
 autoload/haskellmode.vim | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/autoload/haskellmode.vim b/autoload/haskellmode.vim
index 7c3714d..af80ff2 100644
--- a/autoload/haskellmode.vim
+++ b/autoload/haskellmode.vim
@@ -157,14 +157,16 @@ endfunction
 " TODO: we could have buffer-local settings, at the expense of
 "       reconfiguring for every new buffer.. do we want to?
 function! haskellmode#GHC()
-  if (!exists("g:ghc") || !executable(g:ghc)) 
-    if !executable('ghc') 
+  if (!exists("g:ghc") || !executable(g:ghc))
+    if executable('ghc')
+      let g:ghc = 'ghc'
+    elseif executable('stack')
+      let g:ghc = substitute(system('stack path --compiler-exe'),'\n','','')
+    else
       echoerr s:scriptname.": can't find ghc. please set g:ghc, or extend $PATH"
       return 0
-    else
-      let g:ghc = 'ghc'
     endif
-  endif    
+  endif
   return 1
 endfunction