Initial commit

CHANGELOG.md

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+# Change Log
+
+## v0.0.1
+
+- Initial RgbToHexColor release.
+

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2014 Kyle Tolle
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+

README.md

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+# RgbToHexColor
+
+Turn a tuple of rgb colors into its corresponding hexadecimal color value!
+
+## Install
+
+```
+gem install rgb_to_hex_color
+```
+
+## Usage
+
+```
+require 'rgb_to_hex_color'
+
+rgb_to_hex_color = RgbToHexColor.new(170, 187, 204)
+
+rgb_to_hex_color.rgb #=> [170, 187, 204]
+rgb_to_hex_color.hex #=> '#AABBCC'
+```
+
+## Development
+
+### Install
+
+```
+gem install --dev rgb_to_hex_color
+```
+
+### Specs
+
+The default Rake task is to run the specs.
+
+```
+rake
+```
+
+## License
+
+MIT
+

Rakefile

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+require 'rspec/core/rake_task'
+
+RSpec::Core::RakeTask.new(:spec)
+
+desc "Run specs"
+task :default => :spec
+

lib/rgb_to_hex_color.rb

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+class RgbToHexColor
+  def initialize(r, g, b)
+    @r = r
+    @g = g
+    @b = b
+  end
+
+  def rgb
+    [ @r, @g, @b ]
+  end
+
+  def valid?
+    r_is_valid? && g_is_valid? && b_is_valid?
+  end
+
+  def hex
+    if valid?
+      hex_string
+    end
+  end
+
+private
+  def r_is_valid?
+    is_valid_color_digit?(@r)
+  end
+
+  def g_is_valid?
+    is_valid_color_digit?(@g)
+  end
+
+  def b_is_valid?
+    is_valid_color_digit?(@b)
+  end
+
+  def is_valid_color_digit?(digit)
+    (0..255).include? digit
+  end
+
+  def hex_string
+    hex_r = decimal_to_hex(@r)
+    hex_g = decimal_to_hex(@g)
+    hex_b = decimal_to_hex(@b)
+
+    "##{hex_r}#{hex_g}#{hex_b}"
+  end
+
+  def decimal_to_hex(digit)
+    digit.to_s(16).
+      rjust(2, '0').
+      upcase
+  end
+end
+

rgb_to_hex_color.gemspec

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+Gem::Specification.new do |s|
+  s.name     = 'rgb_to_hex_color'
+  s.version  = '0.0.1'
+  s.date     = '2014-08-17'
+  s.summary  = 'Convert rgb colors to their hexadecimal value.'
+  s.authors  = ['Kyle Tolle']
+  s.email    = '[email protected]'
+  s.files    = ['lib/rgb_to_hex_color.rb', 'spec/rgb_to_hex_color_spec.rb']
+  s.license  = 'MIT'
+  s.homepage = 'https://github.com/kyletolle/rgb_to_hex_color'
+
+  s.add_development_dependency 'rspec', '~> 3.0', '>= 3.0.0'
+end
+

spec/rgb_to_hex_color_spec.rb

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+require 'rspec'
+require 'rgb_to_hex_color'
+
+describe RgbToHexColor do
+  let(:rgb_to_hex) { described_class.new(*initial_colors) }
+
+  shared_context "with simple initial colors" do
+    let(:initial_colors ) { [ 1, 2, 3 ] }
+  end
+
+  describe "#rgb" do
+    subject { rgb_to_hex.rgb }
+
+    include_context "with simple initial colors"
+
+    let(:expected_colors) { initial_colors }
+
+    it "returns the colors it was initialized with" do
+      expect(subject).to eq expected_colors
+    end
+  end
+
+  describe "#valid?" do
+    subject { rgb_to_hex.valid? }
+
+    describe "for valid rgb colors" do
+      include_context "with simple initial colors"
+
+      it "is true" do
+        expect(subject).to eq true
+      end
+    end
+
+    describe "for invalid r color" do
+      let(:initial_colors) { [ -1, 2, 3 ] }
+
+      it "is false" do
+        expect(subject).to eq false
+      end
+    end
+
+    describe "for invalid g color" do
+      let(:initial_colors) { [ 1, "-2", 3 ] }
+
+      it "is false" do
+        expect(subject).to eq false
+      end
+    end
+
+    describe "for invalid b color" do
+      let(:initial_colors) { [ 1, 2, Object.new ] }
+
+      it "is false" do
+        expect(subject).to eq false
+      end
+    end
+  end
+
+  describe "#hex" do
+    subject { rgb_to_hex.hex }
+
+    describe "with valid, small digits" do
+      let(:initial_colors)     { [ 1, 2, 3 ] }
+      let(:expected_hex_color) { '#010203' }
+
+      it "returns the correct hex string" do
+        expect(subject).to eq expected_hex_color
+      end
+    end
+
+    describe "with valid, large digits" do
+      let(:initial_colors)     { [ 100, 200, 222 ] }
+      let(:expected_hex_color) { '#64C8DE' }
+
+      it "returns the correct hex string" do
+        expect(subject).to eq expected_hex_color
+      end
+    end
+
+    describe "with invalid digits" do
+      let(:initial_colors) { [ -1, "b", Object.new ] }
+
+      it "is nil" do
+        expect(subject).to be_nil
+      end
+    end
+  end
+end
+