Merge pull request ipython-contrib#1336 from Tautvis/master

Add short execution threshold for ExecutionTime plugin

Author: juhasch

src/jupyter_contrib_nbextensions/nbextensions/execute_time/ExecuteTime.js

@@ -49,6 +49,7 @@ define([
             executed: 'executed in ${duration}, finished ${end_time}',
             queued: 'execution queued ${start_time}',
         },
+        hide_shorter_than_threshold_in_ms: 0,
     };
 
     function patch_CodeCell_get_callbacks () {
@@ -263,12 +264,16 @@ define([
               end_time = cell.metadata.ExecuteTime.end_time;
         var msg = options.template[end_time ? 'executed' : 'queued'];
         msg = msg.replace('${start_time}', format_moment(start_time));
+        var show_timing = true;
         if (end_time) {
             end_time = moment(end_time);
             msg = msg.replace('${end_time}', format_moment(end_time));
             var exec_time = -start_time.diff(end_time);
             msg = msg.replace('${duration}', humanized_duration(exec_time));
+            show_timing = exec_time >= options.hide_shorter_than_threshold_in_ms;
         }
+        toggle_timing_display([cell], show_timing);
+        
         timing_area.text(msg);
         return timing_area;
     }

src/jupyter_contrib_nbextensions/nbextensions/execute_time/ExecuteTime.yaml

@@ -86,3 +86,12 @@ Parameters:
     replacement tokens.
   default: 'execution queued ${start_time}'
   input_type: text
+  
+- name: ExecuteTime.hide_shorter_than_threshold_in_ms
+  description: |
+    Hide execution timings that are shorter than this threshold (in ms). Set to 
+    zero to show all timings.
+  default: 0
+  input_type: number
+  step: 1
+  min: 1

src/jupyter_contrib_nbextensions/nbextensions/execute_time/readme.md

@@ -113,6 +113,10 @@ The available options are:
   cells. The template uses an ES2015-like syntax, but replaces only the exact
   strings `${start_time}`, plus (if defined) `${end_time}` and `${duration}`.
   Defaults to `'execution queued ${start_time}'`.
+  
+* `ExecuteTime.hide_shorter_than_threshold_in_ms`: Threshold to hide execution 
+  timings that are short. Set this to zero to show all timings.
+  Defaults to `0`.