{ lib, fetchurl }: with builtins; { project, id, filename, ... }@args: let # I think this is supposed to be some weak automation # protection. This split "id" is simply part of the download URL. # # Note that if it's zero-prefixed we need to remove the zeroes. It's # really an odd one... a = head (match "0*([[:digit:]]+)" (substring 0 4 id)); b = head (match "0*([[:digit:]]+)" (substring 4 7 id)); url = "https://media.forgecdn.net/files/${a}/${b}/${filename}"; otherArgs = removeAttrs args [ "project" "id" "filename" ]; in fetchurl (otherArgs // { inherit url; # Rename files to avoid names incompatible with the nix store name = "${project}.jar"; })