1 files changed, 103 insertions, 0 deletions
diff --git a/examples/telnet/chat-app.py b/examples/telnet/chat-app.py
new file mode 100755
index 0000000..2e3508d
--- /dev/null
+++ b/examples/telnet/chat-app.py
@@ -0,0 +1,103 @@
+#!/usr/bin/env python
+"""
+A simple chat application over telnet.
+Everyone that connects is asked for his name, and then people can chat with
+each other.
+"""
+import logging
+import random
+from asyncio import Future, run
+
+from prompt_toolkit.contrib.telnet.server import TelnetServer
+from prompt_toolkit.formatted_text import HTML
+from prompt_toolkit.shortcuts import PromptSession, clear
+
+# Set up logging
+logging.basicConfig()
+logging.getLogger().setLevel(logging.INFO)
+
+# List of connections.
+_connections = []
+_connection_to_color = {}
+
+
+COLORS = [
+    "ansired",
+    "ansigreen",
+    "ansiyellow",
+    "ansiblue",
+    "ansifuchsia",
+    "ansiturquoise",
+    "ansilightgray",
+    "ansidarkgray",
+    "ansidarkred",
+    "ansidarkgreen",
+    "ansibrown",
+    "ansidarkblue",
+    "ansipurple",
+    "ansiteal",
+]
+
+
+async def interact(connection):
+    write = connection.send
+    prompt_session = PromptSession()
+
+    # When a client is connected, erase the screen from the client and say
+    # Hello.
+    clear()
+    write("Welcome to our chat application!\n")
+    write("All connected clients will receive what you say.\n")
+
+    name = await prompt_session.prompt_async(message="Type your name: ")
+
+    # Random color.
+    color = random.choice(COLORS)
+    _connection_to_color[connection] = color
+
+    # Send 'connected' message.
+    _send_to_everyone(connection, name, "(connected)", color)
+
+    # Prompt.
+    prompt_msg = HTML('<reverse fg="{}">[{}]</reverse> &gt; ').format(color, name)
+
+    _connections.append(connection)
+    try:
+        # Set Application.
+        while True:
+            try:
+                result = await prompt_session.prompt_async(message=prompt_msg)
+                _send_to_everyone(connection, name, result, color)
+            except KeyboardInterrupt:
+                pass
+    except EOFError:
+        _send_to_everyone(connection, name, "(leaving)", color)
+    finally:
+        _connections.remove(connection)
+
+
+def _send_to_everyone(sender_connection, name, message, color):
+    """
+    Send a message to all the clients.
+    """
+    for c in _connections:
+        if c != sender_connection:
+            c.send_above_prompt(
+                [
+                    ("fg:" + color, "[%s]" % name),
+                    ("", " "),
+                    ("fg:" + color, "%s\n" % message),
+                ]
+            )
+
+
+async def main():
+    server = TelnetServer(interact=interact, port=2323)
+    server.start()
+
+    # Run forever.
+    await Future()
+
+
+if __name__ == "__main__":
+    run(main())