update-crates-io.nix

{ attrPaths ? [
  "cargo-download"
#  "cargo-vendor"
  "carnix"
] }:
let
  pkgs = import ../../../default.nix { };


  getSource = pkg: pkg.overrideAttrs (_: {
    dependencies = [];
    phases = [ "unpackPhase" "installPhase" ];
    installPhase = ''
      ls -la
      cp -rv $(pwd) $out
    '';
  });


  # FIXME: use proper paths e.g. ["rust" "cargo-uodate"] for rust.cargo-update
  cargoPackages = map (n: pkgs."${n}") attrPaths;

  generateCarnix = pkg: pkgs.writeScript "carnix-${pkg.name}" ''
    set -ex
    PATH="${pkgs.carnix}/bin:$PATH"

    out=$1
    WRKDIR=$(mktemp -d)
    cp -rv ${getSource pkg}/* $WRKDIR
    cd $WRKDIR
    test ! -e Cargo.lock && cargo update
    carnix generate-nix --src .
    cp crates-io.nix $out
  '';

in with pkgs.lib; pkgs.runCommand "update-crates-io" {
  nativeBuildInputs = [ pkgs.carnix ];
  shellHook = ''
    set -ex
    TMP=$(mktemp -d)
    OUTDIR=$(pwd)
    cd $TMP
    ${concatMapStringsSep "\n" (p: ''
      ${generateCarnix p} $TMP/${p.name}.nix
    '') cargoPackages}
    carnix merge $TMP/*.nix > $OUTDIR/crates-io.nix
    exit 0
  '';
} ""