wavebox: add update script

pkgs/applications/networking/instant-messengers/wavebox/default.nix

@@ -79,6 +79,8 @@ stdenv.mkDerivation {
     --prefix PATH : ${xdg-utils}/bin
   '';
 
+  passthru.updateScript = ./update.sh;
+
   meta = with lib; {
     description = "Wavebox messaging application";
     homepage = "https://wavebox.io";

pkgs/applications/networking/instant-messengers/wavebox/update.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env nix-shell
+#!nix-shell -i bash -p coreutils curl gnugrep
+set -euo pipefail
+
+cd $(dirname "${BASH_SOURCE[0]}")
+
+setKV () {
+    sed -i "s|$2 = \".*\"|$2 = \"${3:-}\"|" $1
+}
+
+version=$(curl -LIs --show-error -o /dev/null -w %{url_effective} 'https://download.wavebox.app/latest/stable/linux/tar' | grep -oP 'Wavebox_\K(.+)(?=.tar.gz)')
+
+sha256_linux64=$(nix-prefetch-url --quiet https://download.wavebox.app/stable/linux/tar/Wavebox_${version}.tar.gz)
+setKV ./default.nix version $version
+setKV ./default.nix sha256 "$sha256_linux64"