PyTerminal .process(code) utility (#2026)

* PyTerminal .process(code) utility

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

pyscript.core/package-lock.json

@@ -1,12 +1,12 @@
 {
     "name": "@pyscript/core",
-    "version": "0.4.18",
+    "version": "0.4.20",
     "lockfileVersion": 3,
     "requires": true,
     "packages": {
         "": {
             "name": "@pyscript/core",
-            "version": "0.4.18",
+            "version": "0.4.20",
             "license": "APACHE-2.0",
             "dependencies": {
                 "@ungap/with-resolvers": "^0.1.0",

pyscript.core/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@pyscript/core",
-    "version": "0.4.18",
+    "version": "0.4.20",
     "type": "module",
     "description": "PyScript",
     "module": "./index.js",

pyscript.core/src/plugins/py-terminal.js

@@ -1,7 +1,7 @@
 // PyScript py-terminal plugin
 import { TYPES, hooks } from "../core.js";
 import { notify } from "./error.js";
-import { customObserver, defineProperty } from "polyscript/exports";
+import { customObserver, defineProperties } from "polyscript/exports";
 
 // will contain all valid selectors
 const SELECTORS = [];
@@ -170,7 +170,25 @@ const pyTerminal = async (element) => {
         terminal.open(target);
         fitAddon.fit();
         terminal.focus();
-        defineProperty(element, "terminal", { value: terminal });
+        defineProperties(element, {
+            terminal: { value: terminal },
+            process: {
+                value: async (code) => {
+                    // this loop is the only way I could find to actually simulate
+                    // the user input char after char in a way that works in both
+                    // MicroPython and Pyodide
+                    for (const line of code.split(/(?:\r|\n|\r\n)/)) {
+                        terminal.paste(`${line}\n`);
+                        do {
+                            await new Promise((resolve) =>
+                                setTimeout(resolve, 0),
+                            );
+                        } while (!readline.activeRead?.resolve);
+                        readline.activeRead.resolve(line);
+                    }
+                },
+            },
+        });
         return terminal;
     };