From e273f678fffe190ba3b22995ca8d91ab60fcf88d Mon Sep 17 00:00:00 2001
From: Robert Estelle <robertestelle@gmail.com>
Date: Tue, 22 Jan 2019 09:22:49 -0500
Subject: [PATCH] =?UTF-8?q?Add=20haskell=5Fstack=5Fghc=5Foptions=20like=20?=
 =?UTF-8?q?=E2=80=A6=5Fcabal=5Fghc=5F=E2=80=A6?=
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Adds new option `g:haskell_stack_ghc_options` which passes options to
`stack ghc`. This is implemented similiarly to
`g:haskell_cabal_ghc_options`.
---
 ale_linters/haskell/stack_ghc.vim                     | 11 ++++++++++-
 doc/ale-haskell.txt                                   | 11 +++++++++++
 doc/ale.txt                                           |  1 +
 .../test_haskell_stack_ghc_command_callback.vader     |  3 +++
 4 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/ale_linters/haskell/stack_ghc.vim b/ale_linters/haskell/stack_ghc.vim
index 8f42b96c..99aa2540 100644
--- a/ale_linters/haskell/stack_ghc.vim
+++ b/ale_linters/haskell/stack_ghc.vim
@@ -1,11 +1,20 @@
 " Author: w0rp <devw0rp@gmail.com>
 " Description: ghc for Haskell files, using Stack
 
+call ale#Set('haskell_stack_ghc_options', '-fno-code -v0')
+
+function! ale_linters#haskell#stack_ghc#GetCommand(buffer) abort
+    return ale#handlers#haskell#GetStackExecutable(a:buffer)
+    \ . ' ghc -- '
+    \ . ale#Var(a:buffer, 'haskell_stack_ghc_options')
+    \ . ' %t'
+endfunction
+
 call ale#linter#Define('haskell', {
 \   'name': 'stack_ghc',
 \   'aliases': ['stack-ghc'],
 \   'output_stream': 'stderr',
 \   'executable_callback': 'ale#handlers#haskell#GetStackExecutable',
-\   'command': 'stack ghc -- -fno-code -v0 %t',
+\   'command_callback': 'ale_linters#haskell#stack_ghc#GetCommand',
 \   'callback': 'ale#handlers#haskell#HandleGHCFormat',
 \})
diff --git a/doc/ale-haskell.txt b/doc/ale-haskell.txt
index a4db683b..2247eddc 100644
--- a/doc/ale-haskell.txt
+++ b/doc/ale-haskell.txt
@@ -107,6 +107,17 @@ g:ale_haskell_stack_build_options           *g:ale_haskell_stack_build_options*
   We default to using `'--fast'`. Since Stack generates binaries, your
   programs will be slower unless you separately rebuild them outside of ALE.
 
+===============================================================================
+stack-ghc                                               *ale-haskell-stack-ghc*
+
+g:ale_haskell_stack_ghc_options               *g:ale_haskell_stack_ghc_options*
+                                              *b:ale_haskell_stack_ghc_options*
+  Type: |String|
+  Default: `'-fno-code -v0'`
+
+  This variable can be changed to modify flags given to ghc through `stack
+  ghc`
+
 ===============================================================================
 stylish-haskell                                   *ale-haskell-stylish-haskell*
 
diff --git a/doc/ale.txt b/doc/ale.txt
index ac71ab83..54d63741 100644
--- a/doc/ale.txt
+++ b/doc/ale.txt
@@ -140,6 +140,7 @@ CONTENTS                                                         *ale-contents*
       hfmt................................|ale-haskell-hfmt|
       hlint...............................|ale-haskell-hlint|
       stack-build.........................|ale-haskell-stack-build|
+      stack-ghc...........................|ale-haskell-stack-ghc|
       stylish-haskell.....................|ale-haskell-stylish-haskell|
       hie.................................|ale-haskell-hie|
     hcl...................................|ale-hcl-options|
diff --git a/test/command_callback/test_haskell_stack_ghc_command_callback.vader b/test/command_callback/test_haskell_stack_ghc_command_callback.vader
index 4adab583..f58f8b5f 100644
--- a/test/command_callback/test_haskell_stack_ghc_command_callback.vader
+++ b/test/command_callback/test_haskell_stack_ghc_command_callback.vader
@@ -12,3 +12,6 @@ Execute(The linter should be executed when there is a stack.yaml file):
 
   AssertLinter 'stack', 'stack ghc -- -fno-code -v0 %t'
 
+  let b:ale_haskell_stack_ghc_options = 'foobar'
+
+  AssertLinter 'stack', 'stack ghc -- foobar %t'