lektor

Example Python program lektor.py This program creates a PyQt GUI

Modules

• import atexit
• import os
• import sys
• from PyQt5.QtCore import QTimer, pyqtSignal, QProcess, QUrl
• from PyQt5.QtGui import QTextCursor, QDesktopServices
• from PyQt5.QtWidgets import (
• import frozen_stubs

Classes

• class MainWindow(QMainWindow):

Methods

• def init(self):
• def open_site(self):
• def open_admin(self):
• def lookup_lektor(self):
• def append_data(self, data):
• def read_proc(self):
• def finish_proc(self):
• def open_click(self):
• def update_button_state(self):
• def proc_kill(self):
• def app_main(args):

Code

Example Python PyQt program :

import atexit
import os
import sys

from PyQt5.QtCore import QTimer, pyqtSignal, QProcess, QUrl
from PyQt5.QtGui import QTextCursor, QDesktopServices
from PyQt5.QtWidgets import (
    QApplication,
    QHBoxLayout,
    QMainWindow,
    QMessageBox,
    QPlainTextEdit,
    QPushButton,
    QVBoxLayout,
    QWidget,
    QFileDialog,
)

import frozen_stubs


class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        self.resize(400, 150)
        self.setWindowTitle('Lektor')

        self.setCentralWidget(QWidget())
        self.centralWidget().setLayout(QVBoxLayout())

        layout = self.centralWidget().layout()
        button_container = QWidget(self.centralWidget())
        button_container.setLayout(QHBoxLayout())
        layout.addWidget(button_container)
        self.log = QPlainTextEdit(self.centralWidget())
        layout.addWidget(self.log)

        layout = button_container.layout()
        self.open_button = QPushButton('Open', button_container)
        self.open_button.clicked.connect(self.open_click)
        layout.addWidget(self.open_button)

        self.close_button = QPushButton('Close', button_container)
        self.close_button.setEnabled(False)
        self.close_button.clicked.connect(self.proc_kill)
        layout.addWidget(self.close_button)

        self.browse_button = QPushButton('Browse', button_container)
        self.browse_button.setEnabled(False)
        self.browse_button.clicked.connect(self.open_site)
        layout.addWidget(self.browse_button)

        self.admin_button = QPushButton('Admin', button_container)
        self.admin_button.setEnabled(False)
        self.admin_button.clicked.connect(self.open_admin)
        layout.addWidget(self.admin_button)

        self.proc = None
        self.update_button_state()

    def open_site(self):
        QDesktopServices.openUrl(QUrl('http://127.0.0.1:5000'))

    def open_admin(self):
        QDesktopServices.openUrl(QUrl('http://127.0.0.1:5000/admin'))

    def lookup_lektor(self):
        meipass = getattr(sys, '_MEIPASS', None)
        script = meipass or __file__
        script_dir = os.path.dirname(os.path.abspath(script))
        if meipass:
            script_dir = os.path.join(script_dir, 'Resources')
        lektor = os.path.join(script_dir, 'lektor.pex')
        if not os.path.exists(lektor):
            lektor = None
        return lektor


    def append_data(self, data):
        self.log.moveCursor(QTextCursor.End)
        self.log.insertPlainText(data)
        self.log.moveCursor(QTextCursor.End)

    def read_proc(self):
        self.append_data(bytes(self.proc.readAllStandardOutput()).decode())
        self.append_data(bytes(self.proc.readAllStandardError()).decode())

    def finish_proc(self):
        self.read_proc()
        self.proc = None
        self.update_button_state()

    def open_click(self):
        if self.proc:
            self.proc_kill()
        lektor = self.lookup_lektor()
        if lektor is None:
            QMessageBox.critical(self, self.windowTitle(), 'Lektor binary not found')
            return
        file_name, _ = QFileDialog.getOpenFileName(
            self,
            'Open project',
            filter='Project Files (*.lektorproject)'
        )
        if not file_name:
            return
        self.proc = QProcess(self)
        self.proc.readyRead.connect(self.read_proc)
        self.proc.start(' '.join([
            lektor,
            '--project',
            os.path.dirname(file_name),
            'server',
            '-p',
            '5000',
        ]))
        self.proc.finished.connect(self.finish_proc)
        self.update_button_state()

    def update_button_state(self):
        self.close_button.setEnabled(self.proc is not None)
        self.browse_button.setEnabled(self.proc is not None)
        self.admin_button.setEnabled(self.proc is not None)
        self.log.setVisible(self.proc is not None)

    def proc_kill(self):
        if self.proc is not None:
            self.proc.kill()
            self.log.clear()
        self.update_button_state()


def app_main(args):
    app = QApplication(sys.argv)
    win = MainWindow()
    win.show()
    try:
        atexit.register(win.proc_kill)
        return app.exec_()
    finally:
        atexit.unregister(win.proc_kill)
        win.proc_kill()


if __name__ == '__main__':
    sys.exit(app_main(sys.argv))

Useful Links

• Articles: https://python-commandments.org/
• PyQt: https://pythonpyqt.com/
• Tutorial: https://pythonprogramminglanguage.com/