browser: allow browsing local directories

BOARD.txt

@@ -1,7 +1,5 @@
 TODO                                    
 ----------------------------------------
-opt. maintain history between sessions
-directory view for file scheme
 search in page (ugh)
 
 
@@ -59,3 +57,4 @@ home page
 different rendering mode
 preferences per site
 basic mouse support
+basic local browsing

bebop/browser/file.py

@@ -1,5 +1,8 @@
 """Local files browser."""
 
+import logging
+from pathlib import Path
+
 from bebop.browser.browser import Browser
 from bebop.page import Page
 
@@ -20,6 +23,12 @@ def open_file(browser: Browser, filepath: str, encoding="utf-8"):
     Returns:
     The loaded file URI on success, None otherwise (e.g. file not found).
     """
+    path = Path(filepath)
+    if not path.exists():
+        logging.error(f"File {filepath} does not exist.")
+        return None
+
+    if path.is_file():
         try:
             with open(filepath, "rt", encoding=encoding) as f:
                 text = f.read()
@@ -27,6 +36,15 @@ def open_file(browser: Browser, filepath: str, encoding="utf-8"):
             browser.set_status_error(f"Failed to open file: {exc}")
             return None
         browser.load_page(Page.from_text(text))
+    elif path.is_dir():
+        gemtext = filepath + "\n\n"
+        for entry in sorted(path.iterdir()):
+            name = entry.name
+            if entry.is_dir():
+                name += "/"
+            gemtext += f"=> {entry} {name}\n"
+        wrap_at = browser.config["text_width"]
+        browser.load_page(Page.from_gemtext(gemtext, wrap_at))
     file_url = "file://" + filepath
     browser.current_url = file_url
     return file_url