1 files changed, 45 insertions, 0 deletions
diff --git a/pkgs/development/tools/yarn2nix/fixup_bin.js b/pkgs/development/tools/yarn2nix/fixup_bin.js
new file mode 100644
index 000000000000..dab1759c2046
--- /dev/null
+++ b/pkgs/development/tools/yarn2nix/fixup_bin.js
@@ -0,0 +1,45 @@
+#!/usr/bin/env node
+"use strict";
+
+/* Usage:
+ * node fixup_bin.js <output_dir> [<bin_pkg_1>, <bin_pkg_2> ... ]
+ */
+
+const fs = require("fs");
+const path = require("path");
+
+const output = process.argv[2];
+const packages_to_publish_bin = process.argv.slice(3);
+const derivation_bin_path = output + "/bin";
+
+function processPackage(name) {
+  console.log("Processing ", name);
+  const package_path = output + "/node_modules/" + name;
+  const package_json_path = package_path + "/package.json";
+  const package_json = JSON.parse(fs.readFileSync(package_json_path));
+
+  if (!package_json.bin) {
+    console.log("No binaries provided");
+    return;
+  }
+
+  // There are two alternative syntaxes for `bin`
+  // a) just a plain string, in which case the name of the package is the name of the binary.
+  // b) an object, where key is the name of the eventual binary, and the value the path to that binary.
+  if (typeof package_json.bin == "string") {
+    let bin_name = package_json.bin;
+    package_json.bin = { };
+    package_json.bin[package_json.name] = bin_name;
+  }
+
+  for (let binName in package_json.bin) {
+    const bin_path = package_json.bin[binName];
+    const full_bin_path = path.normalize(package_path + "/" + bin_path);
+    fs.symlinkSync(full_bin_path, derivation_bin_path + "/"+ binName);
+    console.log("Linked", binName);
+  }
+}
+
+packages_to_publish_bin.forEach((pkg) => {
+  processPackage(pkg);
+});