Add color command

lib/uplot/command.rb

@@ -193,6 +193,11 @@ module Uplot
           params.xlim = get_lim(v)
         end
 
+      parsers[:colors]
+        .on('-n', '--names', TrueClass) do |v|
+          @color_names = v
+        end
+
       # Preventing the generation of new sub-commands
       parsers.default = nil
 
@@ -242,6 +247,12 @@ module Uplot
 
     def run
       parse_options
+      
+      if command == :colors
+        Plot.colors
+        exit
+      end
+
       # Sometimes the input file does not end with a newline code.
       while input = Kernel.gets(nil)
         input.freeze

lib/uplot/plot.rb

@@ -123,6 +123,18 @@ module Uplot
       UnicodePlot.boxplot(headers, series, **params.to_hc)
     end
 
+    def colors
+        UnicodePlot::StyledPrinter::TEXT_COLORS.each do |k,v|
+          print v
+          print k
+          print "\t"
+          print "  ●"
+          print "\033[0m"
+          print "\t"
+        end
+        puts
+    end
+
     def check_series_size(data, fmt)
       series = data.series
       if series.size == 1