Python 簡単なGUIツールの作り方 PyQt6編 ファイル名置換ツール

# -*- coding:utf-8 -*-

from pathlib import Path
import re
from PyQt6.QtWidgets import (
    QApplication, QMainWindow, QVBoxLayout, QPushButton,
    QLineEdit, QLabel, QFileDialog, QWidget
)

class FileRenamerApp(QMainWindow):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("ファイル名置換ツール")
        
        # Main widget
        self.main_widget = QWidget()
        self.setCentralWidget(self.main_widget)
        
        # Layout
        self.layout = QVBoxLayout(self.main_widget)
        
        # Folder selection
        self.folder_label = QLabel("フォルダ: 未選択")
        self.layout.addWidget(self.folder_label)
        self.select_folder_button = QPushButton("フォルダを選択")
        self.select_folder_button.clicked.connect(self.select_folder)
        self.layout.addWidget(self.select_folder_button)
        
        # Pattern input
        self.pattern_input = QLineEdit()
        self.pattern_input.setPlaceholderText("置換パターン (例: test)")
        self.layout.addWidget(self.pattern_input)
        
        # Replace input
        self.replace_input = QLineEdit()
        self.replace_input.setPlaceholderText("置換後の文字列 (例: newfilename_)")
        self.layout.addWidget(self.replace_input)
        
        # Execute button
        self.execute_button = QPushButton("実行")
        self.execute_button.clicked.connect(self.rename_files)
        self.layout.addWidget(self.execute_button)
        
        # Status label
        self.status_label = QLabel("")
        self.layout.addWidget(self.status_label)
        
        # State variables
        self.selected_folder = None
    
    def select_folder(self):
        folder = QFileDialog.getExistingDirectory(self, "フォルダを選択")
        if folder:
            self.selected_folder = Path(folder)
            self.folder_label.setText(f"フォルダ: {self.selected_folder}")
    
    def rename_files(self):
        if not self.selected_folder:
            self.status_label.setText("フォルダを選択してください。")
            return
        
        pattern = self.pattern_input.text()
        replace = self.replace_input.text()
        
        if not pattern or not replace:
            self.status_label.setText("パターンと置換文字列を入力してください。")
            return
        
        try:
            for filename in self.selected_folder.iterdir():
                if filename.is_file():
                    new_filename = re.sub(pattern, replace, filename.name)
                    filename.rename(self.selected_folder / new_filename)
            self.status_label.setText("ファイル名を置換しました。")
        except Exception as e:
            self.status_label.setText(f"エラー: {str(e)}")

if __name__ == "__main__":
    import sys
    app = QApplication(sys.argv)
    window = FileRenamerApp()
    window.show()
    sys.exit(app.exec())