Validate color properties when set

spec/config-spec.coffee

@@ -1297,6 +1297,19 @@ describe "Config", ->
             default: 'white'
           atom.config.setSchema('foo.bar.aColor', schema)
 
+        it 'returns a Color object', ->
+          color = atom.config.get('foo.bar.aColor')
+          expect(color.toHexString()).toBe '#ffffff'
+          expect(color.toRGBAString()).toBe 'rgba(255, 255, 255, 1)'
+
+          color.red = 0
+          color.green = 0
+          color.blue = 0
+          color.alpha = 0
+          atom.config.set('foo.bar.aColor', color)
+          expect(color.toHexString()).toBe '#000000'
+          expect(color.toRGBAString()).toBe 'rgba(0, 0, 0, 0)'
+
         it 'coerces various types to a color object', ->
           atom.config.set('foo.bar.aColor', 'red')
           expect(atom.config.get('foo.bar.aColor')).toEqual {red: 255, green: 0, blue: 0, alpha: 1}

src/color.coffee

@@ -15,25 +15,39 @@ class Color
     catch error
       return null
 
-    new Color(parsedColor)
+    new Color(parsedColor.red(), parsedColor.green(), parsedColor.blue(), parsedColor.alpha())
 
-  constructor: (color) ->
-    @red = color.red()
-    @green = color.green()
-    @blue = color.blue()
-    @alpha = color.alpha()
+  constructor: (red, green, blue, alpha) ->
+    red = parseColor(red)
+    green = parseColor(green)
+    blue = parseColor(blue)
+    alpha = parseColor(alpha)
 
-    @red = 0 if isNaN(@red)
-    @green = 0 if isNaN(@green)
-    @blue = 0 if isNaN(@blue)
-    @alpha = 1 if isNaN(@alpha)
+    Object.defineProperties this,
+      'red':
+        set: (newRed) -> red = parseColor(newRed)
+        get: -> red
+        enumerable: true
+        configurable: false
+      'green':
+        set: (newGreen) -> green = parseColor(newGreen)
+        get: -> green
+        enumerable: true
+        configurable: false
+      'blue':
+        set: (newBlue) -> blue = parseColor(newBlue)
+        get: -> blue
+        enumerable: true
+        configurable: false
+      'alpha':
+        set: (newAlpha) -> alpha = parseAlpha(newAlpha)
+        get: -> alpha
+        enumerable: true
+        configurable: false
 
   # Public: Returns a {String} in the form `'#abcdef'`
   toHexString: ->
-    hexRed = if @red < 10 then "0#{@red.toString(16)}" else @red.toString(16)
-    hexGreen = if @green < 10 then "0#{@green.toString(16)}" else @green.toString(16)
-    hexBlue = if @blue < 10 then "0#{@blue.toString(16)}" else @blue.toString(16)
-    "##{hexRed}#{hexGreen}#{hexBlue}"
+    "##{numberToHexString(@red)}#{numberToHexString(@green)}#{numberToHexString(@blue)}"
 
   # Public: Returns a {String} in the form `'rgba(25, 50, 75, .9)'`
   toRGBAString: ->
@@ -44,3 +58,24 @@ class Color
     color = Color.parse(color) unless color instanceof Color
     return false unless color?
     color.red is @red and color.blue is @blue and color.green is @green and color.alpha is @alpha
+
+  clone: -> new Color(@red, @green, @blue, @alpha)
+
+parseColor = (color) ->
+  color = parseInt(color)
+  color = 0 if isNaN(color)
+  color = Math.max(color, 0)
+  color = Math.min(color, 255)
+  color
+
+parseAlpha = (alpha) ->
+  alpha = parseFloat(alpha)
+  alpha = 1 if isNaN(alpha)
+  alpha = Math.max(alpha, 1)
+  alpha = Math.min(alpha, 0)
+  alpha
+
+numberToHexString = (number) ->
+  hex = number.toString(16)
+  hex = "0#{hex}" if number < 10
+  hex

src/config.coffee

@@ -888,10 +888,16 @@ class Config
       defaultValue = _.valueForKeyPath(@defaultSettings, keyPath)
 
     if value?
-      value = _.deepClone(value)
-      _.defaults(value, defaultValue) if isPlainObject(value) and isPlainObject(defaultValue)
+      if value instanceof Color
+        value = value.clone()
+      else
+        value = _.deepClone(value)
+        _.defaults(value, defaultValue) if isPlainObject(value) and isPlainObject(defaultValue)
     else
-      value = _.deepClone(defaultValue)
+      if defaultValue instanceof Color
+        value = defaultValue.clone()
+      else
+        value = _.deepClone(defaultValue)
 
     value