idris2: Add updateScript

pkgs/by-name/id/idris2/unwrapped.nix

@@ -152,6 +152,8 @@ stdenv.mkDerivation (finalAttrs: {
         idris2-unwrapped = finalAttrs.finalPackage;
         extraPackages = f idris2Packages;
       };
+
+    updateScript = ./update.nu;
   };
 
   meta = {

pkgs/by-name/id/idris2/update.nu

@@ -0,0 +1,28 @@
+#!/usr/bin/env nix-shell
+#! nix-shell -I ./.
+#! nix-shell -i nu
+#! nix-shell -p nushell nix
+
+const PACKAGE = './pkgs/by-name/id/idris2/package.nix'
+
+def main [] {
+  let tag = http get "https://api.github.com/repos/idris-lang/Idris2/releases"
+    | sort-by -r created_at
+    | first
+    | get tag_name
+
+  print $"Newest version: ($tag)"
+
+  let hash = run-external "nix" "flake" "prefetch" "--json" $"github:idris-lang/Idris2/($tag)"
+    | from json
+    | get hash
+
+  let current_hash = nix eval -f ./. idris2.unwrapped.src.outputHash --json | from json
+  let current_version = nix eval -f ./. idris2.version --json | from json
+
+  $PACKAGE
+    | open
+    | str replace $current_version ($tag | str trim -c 'v')
+    | str replace $current_hash $hash
+    | save -f $PACKAGE
+}