HaskDogs

Haskdogs is a shellscript-like tool which creates tag file for entire haskell project directory. It takes into account first-level dependencies by recursively scanning imports and adding matching packages to the final tag list.

As a result, programmer can use his/her text editor supporting tags (vim, for example) to jump directly to definition of any standard or foreign function he/she uses.

Note, that haskdogs relies on some GNU programs as well as on Unix shell commands such as 'cd', 'mkdir' and so on. Also it would run 'cabal' and ghc-pkg' in order to obtain package information.

INSTALL

Check the dependencies. Currently they are: cabal, ghc, hasktags, GNU find, which and shell.

0. cabal install hasktags haskdogs
1. git clone https://github.com/ierton/haskdogs
2. cd haskdogs
3. cabal configure && cabal install
4. export PATH="\(HOME/.cabal/bin:\)PATH"

RUNNING

1. Make sure yoy have installed hasktags and put it in PATH.

2. cd to your Haskell project dir

   $ cd $HOME/my-haskell-project

3. run haskdogs (cmdline args will be passed to hasktags followed by a filelist generated)

   $ haskdogs

VIM HINT

Hasdogs (and underlying Hasktags) use simple scanning algorithm so it may become confused facing functions with identical names. In this case Hasktags includes all of them in the output file so user has to decide which tag to jump to. Vim offers :tag and :ts commands to deal with such situations but it is somewhat cumbersome to type them every time.

To speedup things a bit I use the following vim binding. It iterates over all same tags quickly with just one C-] command.

" Cyclic tag navigation {{{
let g:rt_cw = ''
function! RT()
	let cw = expand('<cword>')
	try
		if cw != g:rt_cw
			execute 'tag ' . cw
			call search(cw,'c',line('.'))
		else
			try
				execute 'tnext'
			catch /.*/
				execute 'trewind'
			endtry
			call search(cw,'c',line('.'))
		endif
		let g:rt_cw = cw
	catch /.*/
		echo "no tags on " . cw
	endtry
endfunction
map <C-]> :call RT()<CR>
" }}}

Just copy the code above to your ~/.vimrc and reload the vim.

-- Sergey ierton@gmail.com