Add command and invocation counts to header

src/packages/command-logger/src/command-logger.coffee

@@ -12,6 +12,7 @@ class CommandLogger extends ScrollView
   @content: (rootView) ->
     @div class: 'command-logger', tabindex: -1, =>
       @h1 class: 'category-header', outlet: 'categoryHeader'
+      @h1 class: 'category-summary', outlet: 'categorySummary'
       @div class: 'tree-map', outlet: 'treeMap'
 
   @serialize: ->
@@ -95,12 +96,22 @@ class CommandLogger extends ScrollView
     y = d3.scale.linear().range([0, h])
     color = d3.scale.category20()
 
-    setCategoryHeader = (node) =>
+    updateCategoryHeader = (node) =>
       @categoryHeader.text("#{node.name} Commands")
-    setCategoryHeader(root)
+      reduceChildren = (previous, current) ->
+        if current.size?
+          previous + current.size
+        else if current.children?.length > 0
+          previous + current.children.reduce(reduceChildren, 0)
+        else
+          previous
+      commandCount = node.children.length
+      runCount = node.children.reduce(reduceChildren, 0)
+      @categorySummary.text("#{_.pluralize(commandCount, 'command')}, #{_.pluralize(runCount, 'invocation')}")
+    updateCategoryHeader(root)
 
     zoom = (d) ->
-      setCategoryHeader(d)
+      updateCategoryHeader(d)
       kx = w / d.dx
       ky = h / d.dy
       x.domain([d.x, d.x + d.dx])

src/packages/command-logger/stylesheets/command-logger.css

@@ -12,8 +12,15 @@
 }
 
 .command-logger .category-header {
+  text-align: center;
+  padding-bottom: 5px;
+  font-size: 16px;
+}
+
+.command-logger .category-summary {
   text-align: center;
   padding-bottom: 10px;
+  font-size: 12px;
 }
 
 .command-logger .tree-map {

src/stdlib/underscore-extensions.coffee

@@ -63,6 +63,12 @@ _.mixin
   capitalize: (word) ->
     word[0].toUpperCase() + word[1..]
 
+  pluralize: (count=0, singular, plural=singular+'s') ->
+    if count is 1
+      "#{count} #{singular}"
+    else
+      "#{count} #{plural}"
+
   losslessInvert: (hash) ->
     inverted = {}
     for key, value of hash