Nix-prefetch integration for vim?

Help
1

I found this emacs helper to update source hashes:

Anyone knows if is there something similar for vim?

2

just exec it out?

! nix-prefetch-url <url>
3

sure, I can do that, but I was looking for something more advanced, like finding what url needs to be fetched, based on my current buffer, and update automatically the hash in the file

4

this is probably more involved than you would think, most url’s are parameterized with version, and most fetch-helpers like fetchFromGithub abstract over the underlying url

5

try this

function! NixPrefetchUrlSha()
  execute ':normal F"lyt"'
  let l:reg = getreg('"')
  normal! /sha256
  execute ':normal nf"ldt"'
  let l:cmd = '! /run/current-system/sw/bin/nix-prefetch-url ' . '"' . l:reg . '" 2>/dev/null | tail -1 | tr -d "\n"'
  let l:sha = system(l:cmd) | redraw!
  execute ":normal i" . l:sha
endfunc
noremap <Leader>npus :call NixPrefetchUrlSha()<CR> " Nix Prefetch Url Sha
6

if you position your cursor inside the “url” string, that function will soak it up, run nix-prefetch-url to compute the SHA (and download the thing), before jumping into the sha256 = “” and inserting that computed sha into that string.

This of course won’t work, as @jonringer mentioned if the URL contains a ${version}

7

thanks, more or less works, I get a E486: Pattern not found: \<register\> error, but the new hash is fetched. Another possibility would be nix-prefetch-url "<nixpkgs>" -A $pkg.src , that way the ${version} works.
I think is a good start, I’ll try to take a look to it when I have more time

8

If you get it to work the way you want, post it back.
I would be keen

9

sure, I don’t know if I will be able to improve it, but if I can I’ll post it