Initial commit

lib.nix

@@ -0,0 +1,32 @@
+{ lib }:
+let
+  alt = a: b: if a == null then b else a;
+in
+with builtins; rec {
+  latestVersion = attrs: (builtins.head (builtins.sort (a: b: (builtins.compareVersions a.version b.version) == 1) (builtins.attrValues (builtins.mapAttrs (version: value: { inherit version value; }) attrs)))).value;
+  selectSystem = system: systems:
+    if system == "aarch64-darwin" then
+      alt (lib.findFirst ({host, ...}: (match "arm64-apple-darwin.*" host) != null) null systems) (selectSystem "x86_64-darwin" systems)
+    else if system == "x86_64-darwin" then
+      alt (lib.findFirst ({host, ...}: (match "x86_64-apple-darwin.*" host) != null) null systems) (selectSystem "i686-darwin" systems)
+    else if system == "i686-darwin" then
+      lib.findFirst ({host, ...}: (match "i[3456]86-apple-darwin.*" host) != null) null systems
+    else if system == "aarch64-linux" then
+      lib.findFirst ({host, ...}: (match "(aarch64|arm64)-linux-gnu" host) != null) null systems
+    else if system == "x86_64-linux" then
+      lib.findFirst ({host, ...}: (match "x86_64-.*linux-gnu" host) != null) null systems
+    else null;
+  convertHash = hash: let
+    m = (match "(SHA-256|SHA-1|MD5):(.*)" hash);
+    algo = elemAt m 0;
+    h = elemAt m 1;
+  in
+    if m == null then
+      throw "Unsupported hash format ${hash}"
+    else if algo == "SHA-256" then
+      { sha256 = h; }
+    else if algo == "SHA-1" then
+      { sha1 = h; }
+    else
+      { md5 = h; };
+}