Fix color command option

lib/uplot/command.rb

@@ -31,7 +31,7 @@ module Uplot
       @debug    = parser.debug
 
       if command == :colors
-        Plot.colors
+        Plot.colors(parser.color_names)
         exit
       end
 

lib/uplot/command/parser.rb

@@ -7,19 +7,21 @@ module Uplot
   class Command
     class Parser
       attr_reader :command, :params,
-                  :delimiter, :transpose, :headers, :pass, :output, :fmt, :debug
+                  :delimiter, :transpose, :headers, :pass, :output, :fmt,
+                  :color_names, :debug
 
       def initialize
-        @command   = nil
-        @params    = Params.new
+        @command     = nil
+        @params      = Params.new
 
-        @delimiter = "\t"
-        @transpose = false
-        @headers   = nil
-        @pass      = false
-        @output    = $stderr
-        @fmt       = 'xyy'
-        @debug     = false
+        @delimiter   = "\t"
+        @transpose   = false
+        @headers     = nil
+        @pass        = false
+        @output      = $stderr
+        @fmt         = 'xyy'
+        @debug       = false
+        @color_names = false
       end
 
       def create_default_parser
@@ -202,7 +204,7 @@ module Uplot
             end
 
           when :colors
-            parser.on_head('-n', '--names', TrueClass) do |v|
+            parser.on_head('-n', '--names', 'show color names only', TrueClass) do |v|
               @color_names = v
             end
 

lib/uplot/plot.rb

@@ -50,7 +50,7 @@ module Uplot
     end
 
     def get_method2(method1)
-      (method1.to_s + '!').to_sym
+      "#{method1}!".to_sym
     end
 
     def plot_xyy(data, method1, params)
@@ -121,12 +121,14 @@ module Uplot
       UnicodePlot.boxplot(headers, series, **params.to_hc)
     end
 
-    def colors
+    def colors(color_names = false)
       UnicodePlot::StyledPrinter::TEXT_COLORS.each do |k, v|
         print v
         print k
-        print "\t"
-        print '  ●'
+        unless color_names
+          print "\t"
+          print '  ●'
+        end
         print "\033[0m"
         print "\t"
       end