Style fix

after/ftplugin/cabal.vim

@@ -0,0 +1 @@
+setlocal expandtab

after/ftplugin/haskell.vim

@@ -85,10 +85,14 @@ let g:ghcmod_hlint_options = ['--ignore=Eta reduce $']
 " ALE
 let g:ale_enabled = 1
 let g:ale_linters = {'haskell':['ghc-mod', 'hdevtools'], 'c':['clang']}
+" let g:ale_linters = {'haskell':['ghc-mod', 'hdevtools', 'argon'], 'c':['clang']}
 " let g:ale_fixers = {
 	" \    'go': ['gofmt', 'goimports'],
 	" \}
 let g:ale_haskell_hdevtools_options = "-g '-Wall' -g '-Wno-orphans'"
+let g:ale_haskell_argon_error_level = 14
+let g:ale_haskell_argon_warn_level = 10
+let g:ale_haskell_argon_info_level = 6
 
 " completion
 "

ale_linters/haskell/argon.vim

@@ -0,0 +1,64 @@
+" Author: Julian Ospald <hasufell@hasufell.de>
+" Description: argon for Haskell files
+
+call ale#Set('haskell_argon_executable', 'argon')
+call ale#Set('haskell_argon_options', '')
+call ale#Set('haskell_argon_error_level', 12)
+call ale#Set('haskell_argon_warn_level', 8)
+call ale#Set('haskell_argon_info_level', 4)
+
+
+function! ale_linters#haskell#argon#GetExecutable(buffer) abort
+    return ale#Var(a:buffer, 'haskell_argon_executable')
+endfunction
+
+
+function! ale_linters#haskell#argon#GetCommand(buffer) abort
+    return ale#Escape(ale_linters#haskell#argon#GetExecutable(a:buffer))
+    \   . ' '
+    \   . ale#Var(a:buffer, 'haskell_argon_options')
+    \   . ' -m ' . ale#Var(a:buffer, 'haskell_argon_info_level')
+    \   . ' -j'
+    \   . ' %t'
+endfunction
+
+
+function! ale_linters#haskell#argon#Handle(buffer, lines) abort
+    let l:output = []
+
+    for l:error in ale#util#FuzzyJSONDecode(a:lines, [])
+        for l:block in l:error.blocks
+            let l:complexity = l:block.complexity
+
+            if l:complexity >= ale#Var(a:buffer, 'haskell_argon_error_level')
+                let l:type = 'E'
+                let l:max_c = ale#Var(a:buffer, 'haskell_argon_error_level')
+            elseif l:complexity >= ale#Var(a:buffer, 'haskell_argon_warn_level')
+                let l:type = 'W'
+                let l:max_c = ale#Var(a:buffer, 'haskell_argon_warn_level')
+            else
+                let l:type = 'I'
+                let l:max_c = ale#Var(a:buffer, 'haskell_argon_info_level')
+            endif
+
+            call add(l:output, {
+            \   'filename': l:error.path,
+            \   'lnum': str2nr(l:block.lineno),
+            \   'col': str2nr(l:block.col),
+            \   'text': l:block.name . ': cyclomatic complexity of '  . l:complexity,
+            \   'type': l:type,
+            \})
+        endfor
+    endfor
+
+    return l:output
+endfunction
+
+
+call ale#linter#Define('haskell', {
+\   'name': 'argon',
+\   'executable_callback': 'ale_linters#haskell#argon#GetExecutable',
+\   'command_callback': 'ale_linters#haskell#argon#GetCommand',
+\   'callback': 'ale_linters#haskell#argon#Handle',
+\})
+

vimrc

@@ -80,7 +80,9 @@ Plug 'autozimu/LanguageClient-neovim', {
 Plug 'junegunn/fzf', { 'for': 'haskell' }
 
 " linting/compilation
-Plug 'w0rp/ale'
+Plug 'w0rp/ale', {
+	\ 'do': 'bash -c \"cp -R ~/.vim/ale_linters .\"',
+	\ }
 
 " haskell
 " if has("nvim")
@@ -90,7 +92,7 @@ Plug 'eagletmt/ghcmod-vim', { 'for': 'haskell' }
 " completion based on ghc-mod, not LSP
 " Plug 'eagletmt/neco-ghc', { 'for': 'haskell' }
 Plug 'lukerandall/haskellmode-vim', { 'for': 'haskell' }
-Plug 'neovimhaskell/haskell-vim', { 'for': 'haskell' }
+Plug 'neovimhaskell/haskell-vim', { 'for': ['haskell', 'cabal'] }
 Plug 'ucsd-progsys/liquid-types.vim', { 'for': 'haskell' }
 Plug 'bitc/lushtags', {
     \ 'do': 'bash -c \"cabal clean && cabal sandbox delete && cabal sandbox init && cabal install && cp .cabal-sandbox/bin/lushtags ~/.cabal/bin/lushtags\"',
@@ -292,7 +294,7 @@ vnoremap x "_x
 nnoremap x "_x
 
 " Syntax
-syntax enable
+syntax on
 
 " pane navigation
 " Use ctrl-[hjkl] to select the active split!