put grid in background

src/main.py

@@ -135,6 +135,7 @@ if __name__ == "__main__":
     multi_bar_parser.add_argument("--log-scale", action="store_true")
     multi_bar_parser.add_argument("--grid", action="store_true")
     multi_bar_parser.add_argument("--minor-grid", action="store_true")
+    multi_bar_parser.add_argument("--grid-behind", action="store_true")
 
     common_options = [
         {
@@ -220,6 +221,7 @@ if __name__ == "__main__":
             log_scale=args.log_scale,
             grid=args.grid,
             minor_grid=args.minor_grid,
+            grid_behind=args.grid_behind,
             style=json.loads(args.style),
         )
 

src/multi_bar.py

@@ -86,6 +86,7 @@ def multi_bar(
     log_scale: bool = False,
     grid: bool = False,
     minor_grid: bool = False,
+    grid_behind: bool = False,
     style: dict = {},
 ) -> matplotlib.figure.Figure:
     if labels_locations is None:
@@ -102,14 +103,17 @@ def multi_bar(
 
     fig, ax = plt.subplots(layout=plot_layout)
 
+    zorder = 3 if grid_behind else None
     for i, (attribute, measurement) in enumerate(measurements.items()):
-        rects = ax.bar(labels_locations + width * i, measurement, width, label=attribute, **style.get(attribute, {}))
+        rects = ax.bar(labels_locations + width * i, measurement, width, zorder=zorder, label=attribute, **style.get(attribute, {}))
         ax.bar_label(rects, padding=3)
 
     ax.set_ylabel(y_label)
     ax.set_title(title)
     if log_scale:
         ax.set_yscale('log')
+    if (grid or minor_grid) and grid_behind:
+        ax.yaxis.grid(zorder=0)
     if grid:
         ax.yaxis.grid(True, which="major")
     if minor_grid: