graphite: fix update script

pkgs/by-name/gr/graphite/update.nu

@@ -4,11 +4,18 @@
 ^nix-update graphite --version=branch --version-regex '(0-unstable-.*)'
 
 let pkg = "./pkgs/by-name/gr/graphite/package.nix"
-let rev = (open $pkg | lines | where ($it | str contains 'rev = "') | first | str trim | parse 'rev = "{rev}";' | get 0.rev)
-let meta = (http get $"https://raw.githubusercontent.com/GraphiteEditor/Graphite/($rev)/.branding" | lines)
-let branding_rev = ($meta | get 0 | path basename | str replace ".tar.gz" "")
-let branding_hash = (^nix hash convert --to sri --hash-algo sha256 ($meta | get 1) | str trim)
+let rev = open $pkg | lines | where ($it | str contains 'rev = "') | first | str trim | parse 'rev = "{rev}";' | get 0.rev
+
+let shader_url = $"https://raw.githubusercontent.com/timon-schelling/graphite-artifacts/refs/heads/main/rev/($rev)/raster_nodes_shaders_entrypoint.wgsl"
+let shader_hash = ^nix store prefetch-file --hash-type sha256 $shader_url --json | from json | get hash
+
+let branding = http get $"https://raw.githubusercontent.com/GraphiteEditor/Graphite/($rev)/.branding" | lines
+let branding_url = $branding | get 0
+let branding_rev = $branding_url | path basename | str replace ".tar.gz" ""
+let branding_hash = ^nix store prefetch-file --hash-type sha256 --unpack $branding_url --json | from json | get hash
+
 open $pkg
+| str replace --regex 'shaderHash = "[^"]*"' $'shaderHash = "($shader_hash)"'
 | str replace --regex 'brandingRev = "[^"]*"' $'brandingRev = "($branding_rev)"'
 | str replace --regex 'brandingHash = "[^"]*"' $'brandingHash = "($branding_hash)"'
 | save --force $pkg