1 files changed, 151 insertions, 0 deletions
diff --git a/cli/js/os.ts b/cli/js/os.ts
new file mode 100644
index 000000000..2fc06434a
--- /dev/null
+++ b/cli/js/os.ts
@@ -0,0 +1,151 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+import { core } from "./core.ts";
+import * as dispatch from "./dispatch.ts";
+import { sendSync } from "./dispatch_json.ts";
+import { assert } from "./util.ts";
+import * as util from "./util.ts";
+import { window } from "./window.ts";
+import { OperatingSystem, Arch } from "./build.ts";
+
+// builtin modules
+import { _setGlobals } from "./deno.ts";
+
+/** Check if running in terminal.
+ *
+ *       console.log(Deno.isTTY().stdout);
+ */
+export function isTTY(): { stdin: boolean; stdout: boolean; stderr: boolean } {
+  return sendSync(dispatch.OP_IS_TTY);
+}
+
+/** Get the hostname.
+ * Requires the `--allow-env` flag.
+ *
+ *       console.log(Deno.hostname());
+ */
+export function hostname(): string {
+  return sendSync(dispatch.OP_HOSTNAME);
+}
+
+/** Exit the Deno process with optional exit code. */
+export function exit(code = 0): never {
+  sendSync(dispatch.OP_EXIT, { code });
+  return util.unreachable();
+}
+
+function setEnv(key: string, value: string): void {
+  sendSync(dispatch.OP_SET_ENV, { key, value });
+}
+
+function getEnv(key: string): string | undefined {
+  return sendSync(dispatch.OP_GET_ENV, { key })[0];
+}
+
+/** Returns a snapshot of the environment variables at invocation. Mutating a
+ * property in the object will set that variable in the environment for
+ * the process. The environment object will only accept `string`s
+ * as values.
+ *
+ *       console.log(Deno.env("SHELL"));
+ *       const myEnv = Deno.env();
+ *       console.log(myEnv.SHELL);
+ *       myEnv.TEST_VAR = "HELLO";
+ *       const newEnv = Deno.env();
+ *       console.log(myEnv.TEST_VAR == newEnv.TEST_VAR);
+ */
+export function env(): { [index: string]: string };
+export function env(key: string): string | undefined;
+export function env(
+  key?: string
+): { [index: string]: string } | string | undefined {
+  if (key) {
+    return getEnv(key);
+  }
+  const env = sendSync(dispatch.OP_ENV);
+  return new Proxy(env, {
+    set(obj, prop: string, value: string): boolean {
+      setEnv(prop, value);
+      return Reflect.set(obj, prop, value);
+    }
+  });
+}
+
+interface Start {
+  cwd: string;
+  pid: number;
+  argv: string[];
+  mainModule: string; // Absolute URL.
+  debugFlag: boolean;
+  depsFlag: boolean;
+  typesFlag: boolean;
+  versionFlag: boolean;
+  denoVersion: string;
+  v8Version: string;
+  tsVersion: string;
+  noColor: boolean;
+  xevalDelim: string;
+  os: OperatingSystem;
+  arch: Arch;
+}
+
+// This function bootstraps an environment within Deno, it is shared both by
+// the runtime and the compiler environments.
+// @internal
+export function start(preserveDenoNamespace = true, source?: string): Start {
+  core.setAsyncHandler(dispatch.asyncMsgFromRust);
+  const ops = core.ops();
+  // TODO(bartlomieju): this is a prototype, we should come up with
+  // something a bit more sophisticated
+  for (const [name, opId] of Object.entries(ops)) {
+    const opName = `OP_${name.toUpperCase()}`;
+    // Assign op ids to actual variables
+    dispatch[opName] = opId;
+  }
+  // First we send an empty `Start` message to let the privileged side know we
+  // are ready. The response should be a `StartRes` message containing the CLI
+  // args and other info.
+  const s = sendSync(dispatch.OP_START);
+
+  util.setLogDebug(s.debugFlag, source);
+
+  // pid and noColor need to be set in the Deno module before it's set to be
+  // frozen.
+  _setGlobals(s.pid, s.noColor);
+  delete window.Deno._setGlobals;
+  Object.freeze(window.Deno);
+
+  if (preserveDenoNamespace) {
+    util.immutableDefine(window, "Deno", window.Deno);
+    // Deno.core could ONLY be safely frozen here (not in globals.ts)
+    // since shared_queue.js will modify core properties.
+    Object.freeze(window.Deno.core);
+    // core.sharedQueue is an object so we should also freeze it.
+    Object.freeze(window.Deno.core.sharedQueue);
+  } else {
+    // Remove window.Deno
+    delete window.Deno;
+    assert(window.Deno === undefined);
+  }
+
+  return s;
+}
+
+/**
+ * Returns the current user's home directory.
+ * Requires the `--allow-env` flag.
+ */
+export function homeDir(): string {
+  const path = sendSync(dispatch.OP_HOME_DIR);
+  if (!path) {
+    throw new Error("Could not get home directory.");
+  }
+  return path;
+}
+
+/**
+ * Returns the path to the current deno executable.
+ * Requires the `--allow-env` flag.
+ */
+export function execPath(): string {
+  return sendSync(dispatch.OP_EXEC_PATH);
+}