discord: fix parsing versions in updateScripts

Discord changed their download URLs and the new code is now more lenient
regarding the actual download URL, as all we care about is the version
in the URL path.

Example:
https://ptb.dl2.discordapp.net/apps/linux/0.0.110/discord-ptb-0.0.110.tar.gz
                                          ^-----^
                                     This is what we need

Signed-off-by: Sefa Eyeoglu <contact@scrumplex.net>

pkgs/applications/networking/instant-messengers/discord/darwin.nix

@@ -54,11 +54,8 @@ stdenv.mkDerivation {
       #!nix-shell -i bash -p curl gnugrep common-updater-scripts
       set -x
       set -eou pipefail;
-      url=$(curl -sI "https://discordapp.com/api/download/${
-        builtins.replaceStrings [ "discord-" "discord" ] [ "" "stable" ] pname
-      }?platform=osx&format=dmg" | grep -oP 'location: \K\S+')
-      version=''${url##https://dl*.discordapp.net/apps/osx/}
-      version=''${version%%/*.dmg}
+      url=$(curl -sI -o /dev/null -w '%header{location}' "https://discord.com/api/download/${branch}?platform=osx&format=dmg")
+      version=$(echo $url | grep -oP '/\K(\d+\.){2}\d+')
       update-source-version ${lib.optionalString (!stdenv.buildPlatform.isDarwin) "pkgsCross.aarch64-darwin."}${pname} "$version" --file=./pkgs/applications/networking/instant-messengers/discord/default.nix --version-key=${branch}
     '';
   };

pkgs/applications/networking/instant-messengers/discord/linux.nix

@@ -151,11 +151,8 @@ stdenv.mkDerivation rec {
       #!/usr/bin/env nix-shell
       #!nix-shell -i bash -p curl gnugrep common-updater-scripts
       set -eou pipefail;
-      url=$(curl -sI "https://discordapp.com/api/download/${
-        builtins.replaceStrings [ "discord-" "discord" ] [ "" "stable" ] pname
-      }?platform=linux&format=tar.gz" | grep -oP 'location: \K\S+')
-      version=''${url##https://dl*.discordapp.net/apps/linux/}
-      version=''${version%%/*.tar.gz}
+      url=$(curl -sI -o /dev/null -w '%header{location}' "https://discord.com/api/download/${branch}?platform=linux&format=tar.gz")
+      version=$(echo $url | grep -oP '/\K(\d+\.){2}\d+')
       update-source-version ${pname} "$version" --file=./pkgs/applications/networking/instant-messengers/discord/default.nix --version-key=${branch}
     '';
   };