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" 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'),
\})
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