Add register_color_scheme for plugins

app/models/color_scheme.rb

@@ -37,11 +37,27 @@ class ColorScheme < ActiveRecord::Base
   end
 
   def self.base
-    return @base_color if @base_color
-    @base_color = new(name: I18n.t('color_schemes.base_theme_name'), enabled: false)
-    @base_color.colors = base_colors.map { |name, hex| {name: name, hex: hex} }
-    @base_color.is_base = true
-    @base_color
+    return @base_color_scheme if @base_color_scheme
+    @base_color_scheme = new(name: I18n.t('color_schemes.base_theme_name'), enabled: false)
+    @base_color_scheme.colors = base_colors.map { |name, hex| {name: name, hex: hex} }
+    @base_color_scheme.is_base = true
+    @base_color_scheme
+  end
+
+  # create_from_base will create a new ColorScheme that overrides Discourse's base color scheme with the given colors.
+  def self.create_from_base(params)
+    new_color_scheme = new(name: params[:name])
+    colors = base.colors_hashes
+
+    # Override base values
+    params[:colors].each do |name, hex|
+      c = colors.find {|x| x[:name].to_s == name.to_s}
+      c[:hex] = hex
+    end
+
+    new_color_scheme.colors = colors
+    new_color_scheme.save
+    new_color_scheme
   end
 
 

lib/plugin/instance.rb

@@ -5,7 +5,7 @@ require_dependency 'plugin/auth_provider'
 
 class Plugin::Instance
 
-  attr_reader :auth_providers, :assets, :styles
+  attr_reader :auth_providers, :assets, :styles, :color_schemes
   attr_accessor :path, :metadata
 
   def self.find_all(parent_path)
@@ -23,6 +23,7 @@ class Plugin::Instance
     @metadata = metadata
     @path = path
     @assets = []
+    @color_schemes = []
 
     # Automatically include all ES6 JS files
     if @path
@@ -32,6 +33,7 @@ class Plugin::Instance
         register_asset(relative)
       end
     end
+
   end
 
   def name
@@ -85,6 +87,10 @@ class Plugin::Instance
   end
 
   def notify_after_initialize
+    color_schemes.each do |c|
+      ColorScheme.create_from_base(name: c[:name], colors: c[:colors]) unless ColorScheme.where(name: c[:name]).exists?
+    end
+
     if @after_initialize
       @after_initialize.each do |callback|
         callback.call
@@ -107,6 +113,10 @@ class Plugin::Instance
     assets << [full_path, opts]
   end
 
+  def register_color_scheme(name, colors)
+    color_schemes << {name: name, colors: colors}
+   end
+
   def automatic_assets
     css = ""
     js = ""

spec/components/plugin/instance_spec.rb

@@ -161,4 +161,24 @@ describe Plugin::Instance do
     end
   end
 
+  context "register_color_scheme" do
+    it "can add a color scheme for the first time" do
+      plugin = Plugin::Instance.new nil, "/tmp/test.rb"
+      expect {
+        plugin.register_color_scheme("Purple", {primary: 'EEE0E5'})
+        plugin.notify_after_initialize
+      }.to change { ColorScheme.count }.by(1)
+      ColorScheme.where(name: "Purple").should be_present
+    end
+
+    it "doesn't add the same color scheme twice" do
+      Fabricate(:color_scheme, name: "Halloween")
+      plugin = Plugin::Instance.new nil, "/tmp/test.rb"
+      expect {
+        plugin.register_color_scheme("Halloween", {primary: 'EEE0E5'})
+        plugin.notify_after_initialize
+      }.to_not change { ColorScheme.count }
+    end
+  end
+
 end

spec/models/color_scheme_spec.rb

@@ -19,6 +19,29 @@ describe ColorScheme do
     end
   end
 
+  describe "create_from_base" do
+    let(:base_colors) { {first_one: 'AAAAAA', second_one: '333333', third_one: 'BEEBEE'} }
+    let!(:base) { Fabricate(:color_scheme, name: 'Base', color_scheme_colors: [
+                    Fabricate(:color_scheme_color, name: 'first_one',  hex: base_colors[:first_one]),
+                    Fabricate(:color_scheme_color, name: 'second_one', hex: base_colors[:second_one]),
+                    Fabricate(:color_scheme_color, name: 'third_one', hex: base_colors[:third_one])]) }
+
+    before do
+      described_class.stubs(:base).returns(base)
+    end
+
+    it "creates a new color scheme" do
+      c = described_class.create_from_base(name: 'Yellow', colors: {first_one: 'FFFF00', third_one: 'F00D33'})
+      c.colors.should have(base_colors.size).colors
+      first  = c.colors.find {|x| x.name == 'first_one'}
+      second = c.colors.find {|x| x.name == 'second_one'}
+      third  = c.colors.find {|x| x.name == 'third_one'}
+      first.hex.should == 'FFFF00'
+      second.hex.should == base_colors[:second_one]
+      third.hex.should == 'F00D33'
+    end
+  end
+
   describe "destroy" do
     it "also destroys old versions" do
       c1 = described_class.create(valid_params.merge(version: 2))