vim-config/ale_linters/haskell/argon.vim

" 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, [])
		if !has_key(l:error, 'blocks')
			" this cannot be formatted properly into an ALE error
			execute 'echom ''[argon] '' l:error.message'
			return l:output
		endif
		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': l:block.lineno,
			\   'col': 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',
\})