Reloader: Improve should_handle()

Use pathlib for easier path manipulation, and to make the
filename argument accept more types.

In addition, the check if the file was in searchpath is unneeded,
so remove it. By definition when we call easywatch.watch() on
searchpath, every callback must be for a file under search path.
In addition, in event_handler() we ASSUME that file is under
search path, since we call os.path.relpath(src_path, searchpath).
That call would explode if src_path wasn't under searchpath.

staticjinja/reloader.py

@@ -1,4 +1,5 @@
 import os
+from pathlib import Path
 
 
 class Reloader(object):
@@ -21,17 +22,14 @@ def searchpath(self):
     def should_handle(self, event_type, filename):
         """Check if an event should be handled.
 
-        An event should be handled if a file in the searchpath was modified.
+        An event should be handled if a file was created or modified, and
+        still exists.
 
         :param event_type: a string, representing the type of event
 
         :param filename: the path to the file that triggered the event.
         """
-        return (
-            event_type in ("modified", "created")
-            and filename.startswith(self.searchpath)
-            and os.path.isfile(filename)
-        )
+        return event_type in ("modified", "created") and Path(filename).is_file()
 
     def event_handler(self, event_type, src_path):
         """Re-render templates if they are modified.

tests/test_staticjinja.py

@@ -160,12 +160,10 @@ def fake_watch(self):
 def test_should_handle(reloader, root_path, template_path):
     exists = template_path / "template1.html"
     DNE = template_path / "DNE.html"
-    outside_searchpath = root_path / "file.txt"
     assert reloader.should_handle("created", str(exists))
     assert reloader.should_handle("modified", str(exists))
     assert not reloader.should_handle("deleted", str(exists))
     assert not reloader.should_handle("modified", str(DNE))
-    assert not reloader.should_handle("modified", str(outside_searchpath))
 
 
 def test_event_handler(monkeypatch, reloader, template_path):