Automatically hide the diagnostics panel on save

plugin/core/sessions.py

@@ -176,6 +176,10 @@ def update_diagnostics_panel_async(self) -> None:
     def show_diagnostics_panel_async(self) -> None:
         pass
 
+    @abstractmethod
+    def hide_diagnostics_panel_async(self) -> None:
+        pass
+
     # Event callbacks
 
     @abstractmethod

plugin/core/windows.py

@@ -464,6 +464,10 @@ def show_diagnostics_panel_async(self) -> None:
         if self._window.active_panel() is None:
             self._window.run_command("show_panel", {"panel": "output.diagnostics"})
 
+    def hide_diagnostics_panel_async(self) -> None:
+        if self._window.active_panel() == "output.diagnostics":
+            self._window.run_command("hide_panel", {"panel": "output.diagnostics"})
+
 
 class WindowRegistry(object):
     def __init__(self, configs: ConfigManager) -> None:

plugin/documents.py

@@ -383,6 +383,19 @@ def on_post_save_async(self) -> None:
             # The URI scheme has changed. This means we need to re-determine whether any language servers should
             # be attached to the view.
             sublime.set_timeout(self._reset)
+        # Hide empty diagnostics panels on save if the show_diagnostics_panel_on_save option is enabled.
+        if userprefs().show_diagnostics_panel_on_save > 0:
+            self._hide_empty_diagnostics_panels()
+
+    def _hide_empty_diagnostics_panels(self) -> None:
+        severity_threshold = userprefs().show_diagnostics_severity_level
+        hide_panel = True
+        for sb, diagnostics in self.diagnostics_async():
+            for diagnostic, _ in diagnostics:
+                if diagnostic_severity(diagnostic) <= severity_threshold:
+                    hide_panel = False
+        if hide_panel and self._manager:
+            self._manager.hide_diagnostics_panel_async()
 
     def on_close(self) -> None:
         if self._registered and self._manager:

tests/test_session.py

@@ -48,6 +48,9 @@ def update_diagnostics_panel_async(self) -> None:
     def show_diagnostics_panel_async(self) -> None:
         pass
 
+    def hide_diagnostics_panel_async(self) -> None:
+        pass
+
 
 class MockLogger(Logger):