Fix hasktags and hscope

after/ftplugin/haskell.vim

@@ -7,7 +7,38 @@ syntax on
 filetype plugin indent on
 
 
-call CmdAlias('hasktags', '!/home/jule/.cabal/bin/hasktags -c .<CR>')
+" tags
+call CmdAlias('hasktags', '!hasktags -c .<CR>')
+
+" from
+" https://raw.githubusercontent.com/begriffs/haskell-vim-now/master/git-hscope
+call CmdAlias('codex', 'call system("haskell-ctags")<CR><CR>call LoadHscope()<CR>')
+
+
+map <leader>tg :codex<CR>
+set tags=tags;/,codex.tags;/
+
+nnoremap <leader>gd <C-]>
+nnoremap <silent> <leader>cgd :cs find g <C-R>=expand("<cword>")<CR><CR>
+nnoremap <silent> <C-\> :cs find c <C-R>=expand("<cword>")<CR><CR>
+
+set cscopeprg=do_at_stack_root\ hscope
+set csre
+set csto=1 " search codex tags first
+set nocst
+" set cscopequickfix=s-,c-,d-,i-,t-,e-,a-
+
+function! LoadHscope()
+	set nocscopeverbose " suppress 'duplicate connection' error
+	let hsf = findfile("hscope.out", ".;")
+	if filereadable(hsf)
+		exe "cs add " . hsf
+	elseif $HSCOPE_DB != ""
+		cs add $HSCOPE_DB
+	endif
+	set cscopeverbose
+endfunction
+au BufEnter /*.hs call LoadHscope()
 
 
 " haskell-vim