adding new extract command to extract selector or main content as markdown, updateing version as 0.5.0

browser_cli/commands/extract.py

@@ -73,3 +73,11 @@ def extract_html():
     """Print the full HTML of the active tab to stdout."""
     html = _handle("extract.html")
     click.echo(html or "")
+
+
+@extract_group.command("markdown")
+@click.option("--selector", help="Extract only the DOM subtree matching this CSS selector.")
+def extract_markdown(selector):
+    """Extract the page's main content as Markdown."""
+    markdown = _handle("extract.markdown", {"selector": selector})
+    click.echo(markdown or "", nl=not (markdown or "").endswith("\n"))