snipaste: add updateScript

pkgs/by-name/sn/snipaste/package.nix

···
     hash = "sha256-u9e2d9ZpHDbDIsFkseOdJX2Kspn9TkhFfZxbeielDA8=";
   };
 
+  passthru.updateScript = ./update.sh;
+
   meta = {
     description = "Screenshot tools";
     homepage = "https://www.snipaste.com/";

pkgs/by-name/sn/snipaste/update.sh

···
+#!/usr/bin/env nix-shell
+#!nix-shell -i bash -p bash curl coreutils jq common-updater-scripts
+
+latestTag=$(curl -sSfL https://www.snipaste.com/linux_version | jq -r ".subject")
+latestVersion="$(expr "$latestTag" : 'v\(.*\)')"
+currentVersion=$(nix-instantiate --eval -E "with import ./. {}; snipaste.version" | tr -d '"')
+
+if [[ "$latestVersion" == "$currentVersion" ]]; then
+    echo "package is up-to-date"
+    exit 0
+fi
+
+prefetch=$(nix-prefetch-url "https://download.snipaste.com/archives/Snipaste-$latestVersion-x86_64.AppImage")
+hash=$(nix-hash --type sha256 --to-sri "$prefetch")
+update-source-version snipaste "$latestVersion" "$hash" --ignore-same-version