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examples/code_viewer.py

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+import os
+import sys
+
+from rich.syntax import Syntax
+
+from textual import events
+from textual.app import App
+from textual.widgets import Header, Footer, FileClick, ScrollView, DirectoryTree
+
+
+class MyApp(App):
+    """An example of a very simple Textual App"""
+
+    async def on_load(self, event: events.Load) -> None:
+        await self.bind("b", "view.toggle('sidebar')", "Toggle sidebar")
+        await self.bind("q", "quit", "Quit")
+
+        try:
+            self.path = sys.argv[1]
+        except IndexError:
+            self.path = os.path.abspath(
+                os.path.join(os.path.basename(__file__), "../../")
+            )
+
+    async def on_mount(self, event: events.Mount) -> None:
+
+        self.body = ScrollView()
+        self.directory = DirectoryTree(self.path, "Code")
+
+        await self.view.dock(Header(), edge="top")
+        await self.view.dock(Footer(), edge="bottom")
+        await self.view.dock(self.directory, edge="left", size=32, name="sidebar")
+        await self.view.dock(self.body, edge="right")
+
+    async def message_file_click(self, message: FileClick) -> None:
+        syntax = Syntax.from_path(
+            message.path,
+            line_numbers=True,
+            word_wrap=True,
+            indent_guides=True,
+            theme="monokai",
+        )
+        self.app.sub_title = os.path.basename(message.path)
+        await self.body.update(syntax)
+        self.body.home()
+
+
+MyApp.run(title="Code Viewer", log="textual.log")