| """ | |
| Code browser example. | |
| Run with: | |
| python code_browser.py PATH | |
| """ | |
| import sys | |
| from rich.syntax import Syntax | |
| from rich.traceback import Traceback | |
| from textual.app import App, ComposeResult | |
| from textual.containers import Container, Vertical | |
| from textual.reactive import var | |
| from textual.widgets import DirectoryTree, Footer, Header, Static | |
| class CodeBrowser(App): | |
| """Textual code browser app.""" | |
| CSS_PATH = "code_browser.css" | |
| BINDINGS = [ | |
| ("f", "toggle_files", "Toggle Files"), | |
| ("q", "quit", "Quit"), | |
| ] | |
| show_tree = var(True) | |
| def watch_show_tree(self, show_tree: bool) -> None: | |
| """Called when show_tree is modified.""" | |
| self.set_class(show_tree, "-show-tree") | |
| def compose(self) -> ComposeResult: | |
| """Compose our UI.""" | |
| path = "./" if len(sys.argv) < 2 else sys.argv[1] | |
| yield Header() | |
| yield Container( | |
| Vertical(DirectoryTree(path), id="tree-view"), | |
| Vertical(Static(id="code", expand=True), id="code-view"), | |
| ) | |
| yield Footer() | |
| def on_directory_tree_file_click(self, event: DirectoryTree.FileClick) -> None: | |
| """Called when the user click a file in the directory tree.""" | |
| code_view = self.query_one("#code", Static) | |
| try: | |
| syntax = Syntax.from_path( | |
| event.path, | |
| line_numbers=True, | |
| word_wrap=False, | |
| indent_guides=True, | |
| theme="github-dark", | |
| ) | |
| except Exception: | |
| code_view.update(Traceback(theme="github-dark", width=None)) | |
| self.sub_title = "ERROR" | |
| else: | |
| code_view.update(syntax) | |
| self.query_one("#code-view").scroll_home(animate=False) | |
| self.sub_title = event.path | |
| def action_toggle_files(self) -> None: | |
| """Called in response to key binding.""" | |
| self.show_tree = not self.show_tree | |
| if __name__ == "__main__": | |
| CodeBrowser().run() | |