Updated plugins

sources_non_forked/ale/ale_linters/haskell/cabal_ghc.vim

@@ -4,8 +4,7 @@
 call ale#Set('haskell_cabal_ghc_options', '-fno-code -v0')
 
 function! ale_linters#haskell#cabal_ghc#GetCommand(buffer) abort
-    return ale#path#BufferCdString(a:buffer)
-    \   . 'cabal exec -- ghc '
+    return 'cabal exec -- ghc '
     \   . ale#Var(a:buffer, 'haskell_cabal_ghc_options')
     \   . ' %t'
 endfunction
@@ -15,6 +14,7 @@ call ale#linter#Define('haskell', {
 \   'aliases': ['cabal-ghc'],
 \   'output_stream': 'stderr',
 \   'executable': 'cabal',
+\   'cwd': '%s:h',
 \   'command': function('ale_linters#haskell#cabal_ghc#GetCommand'),
 \   'callback': 'ale#handlers#haskell#HandleGHCFormat',
 \})

sources_non_forked/ale/ale_linters/haskell/hls.vim

@@ -0,0 +1,63 @@
+" Author: Yen3 <yen3rc@gmail.com>
+" Description: A language server for haskell
+"              The file is based on hie.vim (author: Luxed
+"              <devildead13@gmail.com>).  It search more project root files.
+"
+call ale#Set('haskell_hls_executable', 'haskell-language-server-wrapper')
+
+function! ale_linters#haskell#hls#FindRootFile(buffer) abort
+    let l:serach_root_files = [
+    \ 'stack.yaml',
+    \ 'cabal.project',
+    \ 'package.yaml',
+    \ 'hie.yaml'
+    \ ]
+
+    for l:path in ale#path#Upwards(expand('#' . a:buffer . ':p:h'))
+        for l:root_file in l:serach_root_files
+            if filereadable(l:path . l:root_file)
+                return l:path
+            endif
+        endfor
+    endfor
+
+    return ''
+endfunction
+
+function! ale_linters#haskell#hls#GetProjectRoot(buffer) abort
+    " Search for the project file first
+    let l:project_file = ale_linters#haskell#hls#FindRootFile(a:buffer)
+
+    " If it's empty, search for the cabal file
+    if empty(l:project_file)
+        " Search all of the paths except for the root filesystem path.
+        let l:paths = join(
+        \   ale#path#Upwards(expand('#' . a:buffer . ':p:h'))[:-2],
+        \   ','
+        \)
+        let l:project_file = globpath(l:paths, '*.cabal')
+    endif
+
+    " If we still can't find one, use the current file.
+    if empty(l:project_file)
+        let l:project_file = expand('#' . a:buffer . ':p')
+    endif
+
+    return fnamemodify(l:project_file, ':h')
+endfunction
+
+function! ale_linters#haskell#hls#GetCommand(buffer) abort
+    let l:executable = ale#Var(a:buffer, 'haskell_hls_executable')
+
+    return ale#handlers#haskell_stack#EscapeExecutable(l:executable,
+    \ 'haskell-language-server-wrapper')
+    \ . ' --lsp'
+endfunction
+
+call ale#linter#Define('haskell', {
+\   'name': 'hls',
+\   'lsp': 'stdio',
+\   'command': function('ale_linters#haskell#hls#GetCommand'),
+\   'executable': {b -> ale#Var(b, 'haskell_hls_executable')},
+\   'project_root': function('ale_linters#haskell#hls#GetProjectRoot'),
+\})

sources_non_forked/ale/ale_linters/haskell/stack_ghc.vim

@@ -4,8 +4,7 @@
 call ale#Set('haskell_stack_ghc_options', '-fno-code -v0')
 
 function! ale_linters#haskell#stack_ghc#GetCommand(buffer) abort
-    return ale#path#BufferCdString(a:buffer)
-    \ . ale#handlers#haskell#GetStackExecutable(a:buffer)
+    return ale#handlers#haskell#GetStackExecutable(a:buffer)
     \ . ' ghc -- '
     \ . ale#Var(a:buffer, 'haskell_stack_ghc_options')
     \ . ' %t'
@@ -16,6 +15,7 @@ call ale#linter#Define('haskell', {
 \   'aliases': ['stack-ghc'],
 \   'output_stream': 'stderr',
 \   'executable': function('ale#handlers#haskell#GetStackExecutable'),
+\   'cwd': '%s:h',
 \   'command': function('ale_linters#haskell#stack_ghc#GetCommand'),
 \   'callback': 'ale#handlers#haskell#HandleGHCFormat',
 \})