Formatting time sort _utils for buttons

Author: Wouter Kroot

mne/io/eyelink/_utils.py

@@ -740,16 +740,23 @@ def _make_eyelink_annots(df_dict, create_annots, apply_offsets):
             this_annot = Annotations(
                 onset=onsets, duration=durations, description=descriptions
             )
-        elif (key in ["buttons"]) and (key in descs):
+        elif (key == "buttons") and (key in descs):
+            required_cols = {"time", "button_id", "button_pressed"}
+            if not required_cols.issubset(df.columns):
+                raise ValueError(f"Missing required columns for 'buttons': {required_cols - set(df.columns)}")
+
+            def get_button_description(row):
+                try:
+                    button_id = int(row["button_id"])
+                    action = "press" if row["button_pressed"] == 1 else "release"
+                    return f"button_{button_id}_{action}"
+                except Exception as e:
+                    raise ValueError(f"Invalid row for button description: {row}") from e
+            df = df.sort_values("time")  # Add this line 
             onsets = df["time"]
             durations = np.zeros_like(onsets)
-            descriptions = df.apply(
-                lambda row: (
-                    f"button_{int(row['button_id'])}_"
-                    f"{'press' if row['button_pressed'] == 1 else 'release'}"
-                ),
-                axis=1,
-            )
+            descriptions = df.apply(get_button_description, axis=1)
+
             this_annot = Annotations(
                 onset=onsets, duration=durations, description=descriptions
             )