Traversing folders using Textual

main.py

from pathlib import Path

from textual import events, on
from textual.app import App, ComposeResult
from textual.containers import Container, Horizontal
from textual.screen import ModalScreen
from textual.widgets import Button, DataTable, Footer, Header, Label

from rich.text import Text


class FileInformation(ModalScreen):
    def __init__(self, file_path: Path):
        self.file_path = file_path
        super().__init__()

    def compose(self):
        self.title = "File Information"
        with Container():
            yield Label(str(self.file_path))
            yield Label(f"Size: {self.file_path.stat().st_size}")
            with Horizontal():
                yield Button("Close", id="close", variant="primary")

    @on(Button.Pressed)
    def close_modal(self, event):
        if event.button.id == "close":
            self.dismiss()


class NavigatorApp(App):
    CSS_PATH = "main.tcss"

    BINDINGS = [
        ("q", "quit", "Quit"),
        ("i", "show_file_information", "Show file information"),
    ]

    table: DataTable
    current_path: Path = Path.home()

    def compose(self) -> ComposeResult:
        yield Header()
        yield Footer()
        self.title = str(self.current_path)

        self.table = DataTable(cursor_type="row")
        self.table.add_column("", key="icon")
        self.table.add_column("Name", key="name", width=20)
        self.table.add_column("Type", key="type")
        yield self.table

    def on_mount(self) -> None:
        self.list_directory()

    def action_quit(self):
        self.exit()

    def action_show_file_information(self):
        row_key, _ = self.table.coordinate_to_cell_key(self.table.cursor_coordinate)
        entry_name = self.table.get_cell(row_key, "name")
        file_path = self.current_path.joinpath(entry_name)

        if file_path.is_dir():
            return

        self.push_screen(FileInformation(file_path=file_path))

    def on_key(self, event: events.Key) -> None:
        if event.key == "enter":
            self.navigate_to_directory()

    def navigate_to_directory(self):
        # Get the keys for the row and column under the cursor.
        row_key, _ = self.table.coordinate_to_cell_key(self.table.cursor_coordinate)
        # Get the value of the first column of the row.
        entry_name = self.table.get_cell(row_key, "name")
        if entry_name == "..":
            self.navigate_up()
            self.table.clear()
            self.list_directory()
        elif self.current_path.joinpath(entry_name).is_dir():
            self.navigate_down(entry_name)
            self.table.clear()
            self.list_directory()

    def navigate_up(self):
        self.current_path = self.current_path.parent

    def navigate_down(self, entry_name):
        self.current_path = self.current_path.joinpath(entry_name)

    def list_directory(self):
        self.title = str(self.current_path)
        files_and_dirs = self.current_path.iterdir()
        if self.current_path.parent == self.current_path:
            self.table.add_row("", "-- no parent --", "Directory")
        else:
            self.table.add_row("", "..", "Directory")

        for entry in files_and_dirs:
            if entry.is_dir():
                icon = "📁"
                entry_type = "Directory"
            else:
                icon = "📄"
                entry_type = "File"
            self.table.add_row(icon, entry.name, entry_type)


if __name__ == "__main__":
    NavigatorApp().run()

main.tcss

DataTable {
  height: 100%;
}

FileInformation {
  align: center middle;
}

FileInformation > Container {
  height: auto;
  width: auto;
  padding: 1 2;
  background: $panel;
}

FileInformation > Container > Horizontal {
  height: auto;
  width: auto;
}

FileInformation > Container > Horizontal > Button {
  margin: 1;
}