hyperlinked_grep: Ensure filename is always printed

Fixes hyperlinks not working when a single file is searched

docs/kittens/hyperlinked_grep.rst

@@ -53,3 +53,9 @@ actions, :doc:`see here <../open_actions>`.
 Hopefully, someday this functionality will make it into some `upstream grep
 <https://github.com/BurntSushi/ripgrep/issues/665>`_
 program directly removing the need for this kitten.
+
+
+.. note::
+   While you can pass any of ripgrep's comand line options to the kitten and
+   they will be forwarded to rg, do not use options that change the output
+   formatting as the kitten works by parsing the output from ripgrep.

kittens/hyperlinked_grep/main.py

@@ -25,7 +25,7 @@ def write_hyperlink(write: Callable[[bytes], None], url: bytes, line: bytes, fra
 def main() -> None:
     if not sys.stdout.isatty() and '--pretty' not in sys.argv:
         os.execlp('rg', 'rg', *sys.argv[1:])
-    cmdline = ['rg', '--pretty'] + sys.argv[1:]
+    cmdline = ['rg', '--pretty', '--with-filename'] + sys.argv[1:]
     p = subprocess.Popen(cmdline, stdout=subprocess.PIPE)
     assert p.stdout is not None
     write: Callable[[bytes], None] = cast(Callable[[bytes], None], sys.stdout.buffer.write)