I just went through this pain, here is my vimrc for hdevtools
(specific for ghc782, just update this line: let l:nixextra =
'-g-package-db=' . system('nix-store -qR $(which ghc) | tail -n1 | tr
-d "\n" ') . '/lib/ghc-7.8.2/package.conf.d' ):
cabal-cargs may help you as well as finding the correct
pacakage.conf.d in the store. I'm not sure why ghc-mod has no problem,
but hdevtools does.
###########################################
au FileType haskell nnoremap <buffer> <F1> :HdevtoolsType<CR>
au FileType haskell nnoremap
<buffer> <silent> <F2> :HdevtoolsClear<CR>
au FileType haskell nnoremap <buffer> <silent> <F3> :HdevtoolsInfo<CR>
au FileType haskell nnoremap
<buffer> <silent> <F4> :GhcModLintAsync<CR>
function! s:CabalCargs(args)"{{{
let l:output = system('cabal-cargs ' . a:args)
if v:shell_error != 0
let l:lines = split(l:output, '\n')
echohl ErrorMsg
echomsg 'args: ' . a:args
for l:line in l:lines
echomsg l:line
endfor
echohl None
return ''
endif
return l:output
endfunction"}}}
function! s:HdevtoolsOptions()"{{{
let l:params = '--format=hdevtools --sourcefile=' .
shellescape(expand('%'))
let l:cargs = s:CabalCargs(l:params . ' ' .
'--ignore=build_depends')
let l:deps = s:CabalCargs(l:params . ' ' . '--allsections
--only=build_depends')
let l:nixextra = '-g-package-db=' . system('nix-store -qR $(which
ghc) | tail -n1 | tr -d "\n" ') . '/lib/ghc-7.8.2/package.conf.d'
return l:cargs . ' ' . '-g-hide-all-packages' . ' ' . l:deps . ' '
. l:nixextra
endfunction"}}}
autocmd Bufenter *.hs :call s:InitHaskellVars()
function! s:InitHaskellVars()"{{{
if filereadable(expand('%'))
let g:hdevtools_options = s:HdevtoolsOptions()
endif
endfunction"}}}
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