wrap loom into a Nix package

platform/default.nix

@@ -0,0 +1,31 @@
+{ pkgs, denoCache }:
+pkgs.stdenv.mkDerivation {
+  name = "loom";
+  src = ./loom;
+
+  buildPhase = ''
+    export DENO_DIR=$TMPDIR/.deno_cache
+    echo "Deno cache is ${denoCache}"
+    cp -rL "${denoCache}" "$DENO_DIR"/ 2>/dev/null || true
+    chmod -R u+w "$DENO_DIR" 2>/dev/null || true
+
+    echo "DENO_DIR is $DENO_DIR"
+
+    ${pkgs.deno}/bin/deno task build:editor
+  '';
+
+  installPhase = ''
+    mkdir -p $out/bin $out/editor
+
+    cp -r editor/dist $out/editor/dist
+    cp -r mod.ts deno.json deno.lock $out
+    cp -r cli $out
+    # This is meant to be executed from inside a devShell with Deno set up
+    cat > $out/bin/loom <<EOF
+#!/bin/sh
+cd $out
+exec deno task run "\$@"
+EOF
+  chmod +x $out/bin/loom
+  '';
+}