pyscript · antocuni · Sep 29, 2023 · Sep 29, 2023 · Sep 29, 2023 · Sep 29, 2023
diff --git a/pyscript.core/src/plugins/py-terminal.js b/pyscript.core/src/plugins/py-terminal.js
@@ -0,0 +1,88 @@
+// PyScript py-terminal plugin
+import { hooks } from "../core.js";
+
+const makePyTerminal = async () => {
+    const element = document.querySelector("py-terminal");
+    if (element === null) {
+        // no py-terminal found, nothing to do
+        return false;
+    }
+
+    document
+        .getElementsByTagName("head")[0]
+        .insertAdjacentHTML(
+            "beforeend",
+            '<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/xterm@5.3.0/css/xterm.min.css">',
+        );
+    const { Terminal } = await import(
+        /* webpackIgnore: true */ "https://cdn.jsdelivr.net/npm/xterm@5.3.0/+esm"
+    );
+    const { Readline } = await import(
+        /* webpackIgnore: true */ "https://cdn.jsdelivr.net/npm/xterm-readline@1.1.1/+esm"
+    );
+
+    const term = new Terminal({
+        theme: {
+            background: "#191A19",
+            foreground: "#F5F2E7",
+        },
+        cursorBlink: true,
+        cursorStyle: "block",
+        rows: 50,
+    });
+
+    const rl = new Readline();
+    term.loadAddon(rl);
+    term.open(element);
+    term.focus();
+
+    async function pyterminal_readline(prompt) {
+        const line = await rl.read(prompt);
+        return line;
+    }
+
+    async function pyterminal_write(line) {
+        rl.write(line);
+    }
+    
+    console.log("PyTerminal made?");
+    return { term, pyterminal_readline, pyterminal_write };
+};
+
+// this is ONLY for non-workers, correct?
+// TODO: how to make it working for workers?
+hooks.onInterpreterReady.add(async function override(pyScript) {
+    console.log("hello onInterpreterReady");
+    const t = await makePyTerminal();
+    if (!t) {
+        console.log("<py-terminal> not found, nothing to do");
+        return;
+    }
+    // XXX: we should investigate pyodide "write handler", it should be more
+    // efficient:
+    // https://pyodide.org/en/stable/usage/streams.html#a-write-handler
+    //
+    // Also: should the stdout/stderr go ALSO to the JS console?
+    function myStdout(byte) {
+        t.write(String.fromCharCode(byte));
+    }
+    const pyodide = pyScript.interpreter;
+    pyodide.setStdout({ raw: myStdout });
+    pyodide.setStderr({ raw: myStdout });
+});
+
+hooks.onWorkerReady.add(async function (_, xworker) {
+    console.log("hello onWorkerReady");
+    const t = await makePyTerminal();
+    if (!t) {
+        console.log("<py-terminal> not found, nothing to do");
+        return;
+    }
+    xworker.sync.pyterminal_readline = t.pyterminal_readline;
+    xworker.sync.pyterminal_write = t.pyterminal_write;
+});
+
+hooks.codeBeforeRunWorker.add(`
+from pyscript import pyterminal
+pyterminal.init()
+`);
diff --git a/pyscript.core/src/stdlib/pyscript/pyterminal.py b/pyscript.core/src/stdlib/pyscript/pyterminal.py
@@ -0,0 +1,23 @@
+import builtins
+import sys
+
+import js
+from pyscript import sync
+
+
+class PyTerminal:
+    def write(self, line):
+        sync.pyterminal_write(line)
+
+    def input(self, prompt):
+        return sync.pyterminal_readline(prompt)
+
+
+PY_TERMINAL = None
+
+
+def init():
+    global PY_TERMINAL
+    PY_TERMINAL = PyTerminal()
+    sys.stdout = sys.stderr = PY_TERMINAL
+    builtins.input = PY_TERMINAL.input
diff --git a/pyscript.core/test/pyterminal.html b/pyscript.core/test/pyterminal.html
@@ -0,0 +1,32 @@
+<!doctype html>
+<html lang="en">
+    <head>
+        <meta charset="UTF-8" />
+        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+        <title>PyScript Next</title>
+        <script>
+            addEventListener("py:ready", console.log);
+        </script>
+        <link rel="stylesheet" href="../dist/core.css">
+        <script type="module" src="../dist/core.js"></script>
+
+    </head>
+    <body>
+        <script type="py" worker>
+            import sys
+            from pyscript import display
+            display("Hello", "PyScript Next", append=False)
+            print("this should go to the terminal")
+            print("another line")
+
+            # XXX we have a problem with the error plugin: this line should
+            # just go to the terminal, NOT to the red box in the DOM
+            print("this goes to stderr", file=sys.stderr)
+
+            import code
+            code.interact()
+        </script>
+
+        <py-terminal></py-terminal>
+    </body>
+</html>
diff --git a/pyscript.core/types/plugins.d.ts b/pyscript.core/types/plugins.d.ts
@@ -1,4 +1,5 @@
-declare namespace _default {
-    function error(): Promise<typeof import("./plugins/error.js")>;
-}
+declare const _default: {
+    error: () => Promise<typeof import("./plugins/error.js")>;
+    "py-terminal": () => Promise<typeof import("./plugins/py-terminal.js")>;
+};
 export default _default;
diff --git a/pyscript.core/types/plugins/py-terminal.d.ts b/pyscript.core/types/plugins/py-terminal.d.ts
@@ -0,0 +1 @@
+export {};
diff --git a/pyscript.core/types/stdlib/pyscript.d.ts b/pyscript.core/types/stdlib/pyscript.d.ts
@@ -4,6 +4,7 @@ declare namespace _default {
         "display.py": string;
         "event_handling.py": string;
         "magic_js.py": string;
+        "pyterminal.py": string;
         "util.py": string;
     };
     let pyweb: {