Websockets for plugin runtime communication (#156)

packages/plugin-runtime/src/interceptStdout.ts

@@ -0,0 +1,37 @@
+import process from "node:process";
+
+export function interceptStdout(
+  intercept: (text: string) => string,
+) {
+  const old_stdout_write = process.stdout.write;
+  const old_stderr_write = process.stderr.write;
+
+  process.stdout.write = (function (write) {
+    return function (text: string) {
+      arguments[0] = interceptor(text, intercept);
+      // deno-lint-ignore no-explicit-any
+      write.apply(process.stdout, arguments as any);
+      return true;
+    };
+  })(process.stdout.write);
+
+  process.stderr.write = (function (write) {
+    return function (text: string) {
+      arguments[0] = interceptor(text, intercept);
+      // deno-lint-ignore no-explicit-any
+      write.apply(process.stderr, arguments as any);
+      return true;
+    };
+  })(process.stderr.write);
+
+  // puts back to original
+  return function unhook() {
+    process.stdout.write = old_stdout_write;
+    process.stderr.write = old_stderr_write;
+  };
+}
+
+function interceptor(text: string, fn: (text: string) => string) {
+  return fn(text).replace(/\n$/, "") +
+    (fn(text) && /\n$/.test(text) ? "\n" : "");
+}