Do not exit when using as a library

exe/uplot

@@ -3,4 +3,4 @@
 
 require 'youplot'
 
-YouPlot::Command.new.run
+YouPlot::Command.new.run_as_executable

exe/youplot

@@ -3,4 +3,4 @@
 
 require 'youplot'
 
-YouPlot::Command.new.run
+YouPlot::Command.new.run_as_executable

lib/youplot.rb

@@ -6,4 +6,10 @@ require 'youplot/dsv'
 require 'youplot/command'
 
 module YouPlot
+  class << self
+    attr_accessor :run_as_executable
+    def run_as_executable?
+      @run_as_executable
+    end
+  end
 end

lib/youplot/backends/unicode_plot_backend.rb

@@ -181,14 +181,14 @@ module YouPlot
           warn "  Headers: \e[35m#{data.headers.inspect}\e[0m"
           warn "  The first item is: \e[35m\"#{series[0][0]}\"\e[0m"
           warn "  The last item is : \e[35m\"#{series[0][-1]}\"\e[0m"
-          exit 1
+          exit 1 if YouPlot.run_as_executable?
         end
         if fmt == 'xyxy' && series.size.odd?
           warn 'YouPlot: In the xyxy format, the number of series must be even.'
           warn ''
           warn "  Number of series: \e[35m#{series.size}\e[0m"
           warn "  Headers: \e[35m#{data.headers.inspect}\e[0m"
-          exit 1
+          exit 1 if YouPlot.run_as_executable?
         end
       end
     end

lib/youplot/command.rb

@@ -22,6 +22,11 @@ module YouPlot
       @backend = YouPlot::Backends::UnicodePlotBackend
     end
 
+    def run_as_executable
+      YouPlot.run_as_executable = true
+      run
+    end
+
     def run
       parser.parse_options(@argv)
       @command ||= parser.command

lib/youplot/command/parser.rb

@@ -93,7 +93,7 @@ module YouPlot
           # This is why you need the code below.
           parser.on('--help', 'print sub-command help menu') do
             puts parser.help
-            exit
+            exit if YouPlot.run_as_executable?
           end
           parser.on('--debug', TrueClass, 'print preprocessed data') do |v|
             options[:debug] = v
@@ -136,7 +136,7 @@ module YouPlot
         main_parser.on('--help', 'print sub-command help menu') do
           puts main_parser.banner
           puts
-          exit
+          exit if YouPlot.run_as_executable?
         end
       end
 

lib/youplot/dsv.rb

@@ -25,10 +25,10 @@ module YouPlot
           Data.new(headers, series)
         elsif h_size > s_size
           warn "\e[35mThe number of headers is greater than the number of series.\e[0m"
-          exit 1
+          exit 1 if YouPlot.run_as_executable?
         elsif h_size < s_size
           warn "\e[35mThe number of headers is less than the number of series.\e[0m"
-          exit 1
+          exit 1 if YouPlot.run_as_executable?
         end
       end
     end