First usable version of the app

README.md

 # localchat
 
+A Python 3 *local-only* chat client, for when multiple people at the same computer want to communicate quickly.
+
+### Requirements
+
+* Python 3.5+
+* PySide2 (`pip3 install PySide2`)
+
+### Config
+
+Edit `config.ini` to change the app's behavior.
+
+Set `timestamp=1` to add HH:MM:SS timestamps to the chat window, `=0` to not use timestamps.
+
+Set `logfile=<filename>` to log each line of chat to the specified file. Remove the filename (i.e. `logfile=`) to disable logging.
+
+Set `sizew` and `sizeh` to set the width and height, respectively, of the window in pixels.
+
+List the `users` you'd like to include in the chat, separated by commas.
+
+### Usage
+
+Each user gets their own input line at the bottom of the window. Pressing `Enter` in a given input line will send that line (and *only* that line, not any of the others) to the chat window. Easy as that!

config.ini

+[DEFAULT]
+timestamp = 1
+logfile = chat.log
+sizew = 640
+sizeh = 480
+users = MyName, MyOtherName

main.py

+from PySide2 import QtWidgets as qt
+from PySide2 import QtCore as qtc
+import configparser, sys, os
+from datetime import datetime as dt
+
+set_debug = False
+
+class TextLine:
+    def __init__(self, username, textarea, timestamp, logfile):
+        self.username = username
+        self.label = qt.QLabel("&{}:".format(username))
+        self.message = qt.QLineEdit()
+        self.message.returnPressed.connect(self.pressButton)
+        self.textarea = textarea
+        self.label.setBuddy(self.message)
+        self.timestamp = timestamp
+        self.logfile = logfile
+        
+    def pressButton(self):
+        if self.timestamp:
+            t = dt.now()
+            o = "[{}] {}: {}".format(t.strftime("%H:%M:%S"), self.username, self.message.text())
+        else:
+            o = "{}: {}".format(self.username, self.message.text())
+        self.textarea.append(o)
+        if self.logfile != "":
+            with open(self.logfile, "a") as file:
+                file.write(o + "\n")
+        self.message.clear()
+
+    def toString(self):
+        print(self.username)
+
+def debug(message):
+    if set_debug:
+        print(message)
+
+def main():
+    debug("Loading config...")
+    cfg = config()
+
+    timestamp = True if int(cfg["timestamp"]) == 1 else False
+
+    debug("Setting up...")
+    app = qt.QApplication([])
+    layout = qt.QVBoxLayout()
+
+    debug("Making text area...")
+    text_area = qt.QTextEdit()
+    text_area.setFocusPolicy(qtc.Qt.NoFocus)
+    layout.addWidget(text_area)
+
+    debug("Getting users...")
+    users = [x.strip() for x in cfg["users"].split(",")]
+    debug("Users are {}".format(users))
+    inputs = []
+    for user in users:
+        ipt = TextLine(user, text_area, timestamp, cfg["logfile"])
+        inputs.append(ipt)
+    for ipt in inputs:
+        layout.addWidget(ipt.label)
+        layout.addWidget(ipt.message)
+
+    debug("Starting window...")
+    window = qt.QWidget()
+    window.setLayout(layout)
+    window.resize(int(cfg["sizew"]), int(cfg["sizeh"]))
+    window.show()
+
+    debug("Starting interactivity...")
+    app.exec_()
+    
+
+def send_message(ipt, text_area):
+    debug("Sending message!")
+    text_area.append("{}: {}".format(ipt.username, ipt.message.text()))
+    ipt.message.clear()
+
+def config():
+    config = configparser.ConfigParser()
+    if not os.path.isfile('config.ini'):
+        print("config.ini is missing!")
+        sys.exit(0)
+    config.read('config.ini')
+    return config["DEFAULT"]
+
+if __name__ == "__main__":
+    main()