Handle pie-chart colours

.gitignore

@@ -8,3 +8,4 @@
 .powrc
 tmp
 _site
+.sass-cache

lib/metrics-api/helpers.rb

@@ -54,6 +54,11 @@ def get_settings(params, data)
     @plotly_modebar = params.fetch('plotly_modebar', 'false')
     @font_size = params.fetch('font_size', '9vh')
     @metric = params.fetch('metric', '')
+    @pie_colours = fix_pie_colours(params.fetch('pie_colours', ''))
+  end
+
+  def fix_pie_colours list
+    list.split(':').map { |c| "##{c}" }.to_s.gsub('"', "'")
   end
 
   def get_title(metadata, params)
@@ -154,7 +159,8 @@ def keep_params qs
       'barcolour',
       'autorefresh',
       'with_path',
-      'font_size'
+      'font_size',
+      'pie_colours'
     ]
 
     good_params = {}

lib/views/pie.erb

@@ -50,7 +50,7 @@ function pie(json) {
     type: 'pie',
     textinfo: 'label+percent',
     marker: {
-      colors: ['#FF6700', '#D60303']
+      colors: <%= @pie_colours %>
     }
   }];
 

spec/helpers/helpers_spec.rb

@@ -469,4 +469,14 @@ def request
 
   end
 
+  it 'turns a list of colours into a JS array' do
+    expect(helpers.fix_pie_colours '1d91a1:8cdbe6:faa2c7:').to eq (
+      "['#1d91a1', '#8cdbe6', '#faa2c7']"
+    )
+  end
+
+  it 'is fine with no pie colours' do
+    expect(helpers.fix_pie_colours '').to eq '[]'
+  end
+
 end