[Haskell-cafe] Generating tagfiles for Vim

[Benjamin Fox]

Here is a very useful bash script to have lying around:
#!/usr/bin/env bash
shopt -s nullglob
while true; do
  if [[  "$PWD" == "$HOME"
      || "$PWD" == /
      || -f "$PWD/package.yaml"
      || -f "$PWD/stack.yaml"
      || -n "$(echo -n ./*.cabal)" ]]; then
    exec "$@"
  else
    cd ..
  fi
done

Name this something like "run-in-project-root", and then you can prefix any
command you run with "run-in-project-root" in order for it to run in the
project's root, as defined by the existence of a package.yaml or stack.yaml
or *.cabal file. (Of course you can customize the exact condition to your
tastes.) So running "run-in-project-root fast-tags filename" is exactly
like running "fast-tags filename" except that fast-tags will execute in the
project root. (And the same for all the other shell commands that you run.)

Of course, this works both when running fast-tags (or any other command)
directly in the shell, and when running a bash snippet in vim with :!, so
long as the "run-in-project-root" script is in a directory that's in your
$PATH.


On Mon, Apr 1, 2019 at 5:56 PM Nathan Merkley <nathanmerkley at gmail.com>
wrote:

> While there is probably a better way, my limited knowledge of vimscript
> had me write this and it works well enough
>
>
> function! UpdateHaskellTags()
>     if filereadable("tags")
>         execute "silent !grep -v '" . bufname("%") . "' ./tags > __newtags"
>         execute "silent !rm tags"
>         execute "silent !mv __newtags tags"
>         execute "silent !fast-tags " . bufname("%")
>     endif
> endfunction
>
> autocmd BufWritePost *.hs :call UpdateHaskellTags()
> autocmd BufWritePost *.hsc :call UpdateHaskellTags()
>
>
> This uses fast-tags to regenerate tags for the current file on every save,
> but will only work if you are operating from the root of your project (or
> wherever you keep your tags). I use ctrlp for navigation so that's never
> been a problem for me
>
> Nathan Merkley
>
> On Mon, Apr 1, 2019 at 9:26 AM Vanessa McHale <vanessa.mchale at iohk.io>
> wrote:
>
>> Hi all,
>>
>> I had been using hasktags for tag generation previously, however, I
>> recently discovered that using GHCi with
>>
>> cabal new-repl
>> λ:> :ctags
>>
>> creates a tags file that actually works with preprocessors (e.g. c2hs or
>> alex or happy).
>>
>> Is there any way to run this semi-automatically?
>>
>> echo ':ctags' | cabal new-repl
>>
>> seems to work in the shell, but I'd like a vim integration if possible
>> (also, it's slow).
>>
>> Cheers,
>> Vanessa McHale
>>
>>
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