From e355a3341f416c97c00b51161400a5c8e8409f71 Mon Sep 17 00:00:00 2001
From: Infinidoge <infinidoge@inx.moe>
Date: Mon, 29 Aug 2022 01:20:49 -0400
Subject: [PATCH] feat(pkgs): add nix-modrinth-prefetch

---
 pkgs/default.nix               |  2 ++
 pkgs/nix-modrinth-prefetch.nix | 13 +++++++++++++
 2 files changed, 15 insertions(+)
 create mode 100644 pkgs/nix-modrinth-prefetch.nix

diff --git a/pkgs/default.nix b/pkgs/default.nix
index 704888f..1cedab5 100644
--- a/pkgs/default.nix
+++ b/pkgs/default.nix
@@ -6,4 +6,6 @@ final: prev: {
   olympus = final.callPackage ./olympus.nix { };
 
   frei = final.callPackage ./frei.nix { source = final.sources.frei; };
+
+  nix-modrinth-prefetch = final.callPackage ./nix-modrinth-prefetch.nix { };
 }
diff --git a/pkgs/nix-modrinth-prefetch.nix b/pkgs/nix-modrinth-prefetch.nix
new file mode 100644
index 0000000..36311bf
--- /dev/null
+++ b/pkgs/nix-modrinth-prefetch.nix
@@ -0,0 +1,13 @@
+{ runtimeShell, writeShellScriptBin, curl, jq, gnused }:
+writeShellScriptBin "nix-modrinth-prefetch" ''
+  input=$(${curl}/bin/curl --no-progress-meter https://api.modrinth.com/v2/version/$1)
+
+  if [[ $input == "" ]]; then
+    echo "Invalid version"
+    exit 1
+  fi
+
+  echo $input \
+  | ${jq}/bin/jq -c '.files | (.[] | select(.primary == true)) // .[0]  | {url: .url, sha512: .hashes.sha512}' \
+  | ${gnused}/bin/sed 's/{"url":"\(.\+\)","sha512":"\(.\+\)"}/fetchurl { url = "\1"; sha512 = "\2"; }/'
+''