Make refresh rebuild the file list

Closes #183

msumastro/image_collection.py

@@ -229,6 +229,8 @@ def refresh(self):
         Refresh the collection by re-reading headers.
         """
         keywords = '*' if self._all_keywords else self.keywords
+        # Re-load list of files
+        self._files = self._fits_files_in_directory()
         self._summary_info = self._fits_summary(header_keywords=keywords)
 
     def _dict_from_fits_header(self, file_name, input_summary=None,

msumastro/tests/test_image_collection.py

@@ -507,7 +507,7 @@ def test_header_with_long_history_roundtrips_to_disk(self, triage_setup):
         table_disk = Table.read('test_table.txt', format='ascii.csv')
         assert len(table_disk) == len(ic.summary_info)
 
-    def test_refresh_method(self, triage_setup):
+    def test_refresh_method_sees_added_keywords(self, triage_setup):
         ic = tff.ImageFileCollection(triage_setup.test_dir, keywords='*')
         # Add a keyword I know isn't already in the header to each file.
         not_in_header = 'BARKARK'
@@ -520,3 +520,15 @@ def test_refresh_method(self, triage_setup):
         # After refreshing the odd keyword should be present.
         print(ic.keywords)
         assert not_in_header.lower() in ic.summary_info.colnames
+
+    def test_refresh_method_sees_added_files(self, triage_setup):
+        ic = tff.ImageFileCollection(triage_setup.test_dir, keywords='*')
+        # Compressed files don't get copied. Not sure why...
+        original_len = len(ic.summary_info) - triage_setup.n_test['compressed']
+        # Generate additional files in this directory
+        for h in ic.headers(save_with_name="_foo"):
+            pass
+        ic.refresh()
+        new_len = len(ic.summary_info) - triage_setup.n_test['compressed']
+        print(ic.summary_info['file'])
+        assert new_len == 2 * original_len