Colorizes text output

`csscss --color` (the default) and `csscss --no-color` are now
available.

Fixes zmoazeni#2

Author: zmoazeni

Gemfile.lock

@@ -2,12 +2,14 @@ PATH
   remote: .
   specs:
     csscss (0.1.0)
+      colorize
       parslet (~> 1.5)
 
 GEM
   remote: https://rubygems.org/
   specs:
     blankslate (2.1.2.4)
+    colorize (0.5.8)
     columnize (0.3.6)
     debugger (1.5.0)
       columnize (>= 0.3.1)

csscss.gemspec

@@ -18,4 +18,5 @@ Gem::Specification.new do |gem|
   gem.require_paths = ["lib"]
 
   gem.add_dependency "parslet", "~> 1.5"
+  gem.add_dependency "colorize"
 end

lib/csscss.rb

@@ -2,6 +2,7 @@
 require "optparse"
 require "json"
 
+require "colorize"
 require "parslet"
 require "csscss/parslet_optimizations"
 

lib/csscss/cli.rb

@@ -1,8 +1,9 @@
 module Csscss
   class CLI
     def initialize(argv)
-      @argv = argv
+      @argv    = argv
       @verbose = false
+      @color   = true
       @minimum = 3
     end
 
@@ -30,7 +31,7 @@ def execute
       if @json
         puts JSONReporter.new(combined_redundancies).report
       else
-        puts Reporter.new(combined_redundancies).report(@verbose)
+        puts Reporter.new(combined_redundancies).report(verbose:@verbose, color:true)
       end
 
     rescue Parslet::ParseFailed => e
@@ -48,6 +49,10 @@ def parse(argv)
           @verbose = v
         end
 
+        opts.on("--[no-]color", "Colorizes output") do |c|
+          @color = c
+        end
+
         opts.on("-n", "--num N", Integer, "Print matches with at least this many rules. Defaults to 3") do |n|
           @minimum = n
         end

lib/csscss/reporter.rb

@@ -4,20 +4,28 @@ def initialize(redundancies)
       @redundancies = redundancies
     end
 
-    def report(verbose = false)
+    def report(options = {})
+      verbose      = options.fetch(:verbose, false)
+      should_color = options.fetch(:color, true)
+
       io = StringIO.new
       @redundancies.each do |selector_groups, declarations|
-        selector_groups = selector_groups.map {|selectors| "{#{selectors}}" }
+        selector_groups = selector_groups.map {|selectors| maybe_color("{#{selectors}}", :red, should_color) }
         last_selector = selector_groups.pop
         count = declarations.size
-        io.puts %Q(#{selector_groups.join(", ")} and #{last_selector} share #{count} rule#{"s" if count > 1})
+        io.puts %Q(#{selector_groups.join(", ")} AND #{last_selector} share #{maybe_color(count, :red, should_color)} rule#{"s" if count > 1})
         if verbose
-          declarations.each {|dec| io.puts "  - #{dec}" }
+          declarations.each {|dec| io.puts(maybe_color("  - #{dec}", :yellow, should_color)) }
         end
       end
 
       io.rewind
       io.read
     end
+
+    private
+    def maybe_color(string, color, condition)
+      condition ? string.to_s.colorize(color) : string
+    end
   end
 end

test/csscss/reporter_test.rb

@@ -12,22 +12,22 @@ module Csscss
       })
 
      expected =<<-EXPECTED
-{.foo} and {.bar} share 2 rules
-{h1, h2}, {.foo} and {.baz} share 1 rule
-{h1, h2} and {.bar} share 1 rule
+{.foo} AND {.bar} share 2 rules
+{h1, h2}, {.foo} AND {.baz} share 1 rule
+{h1, h2} AND {.bar} share 1 rule
 EXPECTED
-     reporter.report.must_equal expected
+     reporter.report(color:false).must_equal expected
 
      expected =<<-EXPECTED
-{.foo} and {.bar} share 2 rules
+{.foo} AND {.bar} share 2 rules
   - width: 1px
   - border: black
-{h1, h2}, {.foo} and {.baz} share 1 rule
+{h1, h2}, {.foo} AND {.baz} share 1 rule
   - display: none
-{h1, h2} and {.bar} share 1 rule
+{h1, h2} AND {.bar} share 1 rule
   - position: relative
 EXPECTED
-     reporter.report(true).must_equal expected
+     reporter.report(verbose:true, color:false).must_equal expected
     end
   end
 end