[ExecuteTime] Optionally clear all timing data on kernel restart

Author: jcb91

src/jupyter_contrib_nbextensions/nbextensions/execute_time/ExecuteTime.js

@@ -33,6 +33,7 @@ define([
 
     // defaults, overridden by server's config
     var options = {
+        clear_timings_on_kernel_restart: false,
         default_kernel_to_utc: true,
         display_absolute_format: 'HH:mm:ss YYYY-MM-DD',
         display_absolute_timings: true,
@@ -313,6 +314,12 @@ define([
                 update_all_timing_areas();
             }
 
+            // setup optional clear-data calls
+            if (options.clear_timings_on_kernel_restart) {
+                console.log(log_prefix, 'Binding kernel_restarting.Kernel event to clear timings.');
+                events.on('kernel_restarting.Kernel', clear_timing_data_all);
+            }
+
             // if displaying relative times, update them at intervals
             if (!options.display_absolute_timings) {
                 var period_ms = 1000 * Math.max(1, options.relative_timing_update_period);

src/jupyter_contrib_nbextensions/nbextensions/execute_time/ExecuteTime.yaml

@@ -7,6 +7,12 @@ Main: ExecuteTime.js
 Compatibility: 4.x, 5.x
 Parameters:
 
+- name: ExecuteTime.clear_timings_on_kernel_restart
+  description: |
+    Clear all cells' execution timing data on any kernel restart event
+  input_type: checkbox
+  default: false
+
 - name: ExecuteTime.display_absolute_timings
   description: |
     Display absolute timings for the start time of execution.

src/jupyter_contrib_nbextensions/nbextensions/execute_time/readme.md

@@ -60,6 +60,9 @@ ConfigManager().update('notebook', {'ExecuteTime': {
 
 The available options are:
 
+* `ExecuteTime.clear_timings_on_kernel_restart`: Clear all cells' execution
+  timing data on any kernel restart event
+
 * `ExecuteTime.display_absolute_timings`: Display absolute timings for the
   start/end time of execution. Setting this `false` will result in the display
   of a relative timestamp like 'a few seconds ago' (see the moment.js function