v0.3.4

run_as_executable

.github/workflows/ci.yml

@@ -7,10 +7,10 @@ jobs:
     strategy:
       matrix:
         os:   ['ubuntu', 'macos']
-        ruby: [ '2.5', '2.6', '2.7' ]
+        ruby: [ '2.5', '2.6', '2.7', '3.0' ]
     steps:
       - uses: actions/checkout@v2
-      - uses: actions/setup-ruby@v1
+      - uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby }}
       - run: gem install bundler

README.md

@@ -1,4 +1,6 @@
-![Logo](https://user-images.githubusercontent.com/5798442/102004318-ec89d280-3d52-11eb-8608-d890b42593f1.png)
+<p align="center">
+  <img src="https://user-images.githubusercontent.com/5798442/103439598-9e952a00-4c81-11eb-881f-67c593bb7861.png" width="75%" height="75%" />
+</p>
 
 ![Build Status](https://github.com/kojix2/youplot/workflows/test/badge.svg)
 [![Gem Version](https://badge.fury.io/rb/youplot.svg)](https://badge.fury.io/rb/youplot)
@@ -18,7 +20,8 @@ gem install youplot
 
 ## Quick Start
 
-`cat data.tsv | uplot <command> [options]`
+* `cat data.tsv | uplot <command> [options]` or
+* `uplot <command> [options] <data.tsv>`
 
 ### barplot
 
@@ -29,7 +32,9 @@ curl -sL https://git.io/ISLANDScsv \
 | uplot bar -d, -t "Areas of the World's Major Landmasses"
 ```
 
-![barplot](https://user-images.githubusercontent.com/5798442/101999903-d36a2d00-3d24-11eb-9361-b89116f44122.png)
+<p align="center">
+<img alt="barplot" src="https://user-images.githubusercontent.com/5798442/101999903-d36a2d00-3d24-11eb-9361-b89116f44122.png">
+</p>
 
 ### histogram
 
@@ -40,7 +45,10 @@ echo -e "from numpy import random;" \
 | python \
 | uplot hist --nbins 20
 ```
-![histogram](https://user-images.githubusercontent.com/5798442/101999820-21cafc00-3d24-11eb-86db-e410d19b07df.png)
+
+<p align="center">
+  <img alt="histogram" src="https://user-images.githubusercontent.com/5798442/101999820-21cafc00-3d24-11eb-86db-e410d19b07df.png">
+</p>
 
 ### lineplot
 
@@ -50,7 +58,9 @@ curl -sL https://git.io/AirPassengers \
 | uplot line -d, -w 50 -h 15 -t AirPassengers --xlim 1950,1960 --ylim 0,600
 ```
 
-![lineplot](https://user-images.githubusercontent.com/5798442/101999825-24c5ec80-3d24-11eb-99f4-c642e8d221bc.png)
+<p align="center">
+  <img alt="lineplot" src="https://user-images.githubusercontent.com/5798442/101999825-24c5ec80-3d24-11eb-99f4-c642e8d221bc.png">
+</p>
 
 ### scatter
 
@@ -60,7 +70,9 @@ curl -sL https://git.io/IRIStsv \
 | uplot scatter -H -t IRIS
 ```
 
-![scatter](https://user-images.githubusercontent.com/5798442/101999827-27284680-3d24-11eb-9903-551857eaa69c.png)
+<p align="center">
+  <img alt="scatter" src="https://user-images.githubusercontent.com/5798442/101999827-27284680-3d24-11eb-9903-551857eaa69c.png">
+</p>
 
 ### density
 
@@ -70,7 +82,9 @@ curl -sL https://git.io/IRIStsv \
 | uplot density -H -t IRIS
 ```
 
-![density](https://user-images.githubusercontent.com/5798442/101999828-2abbcd80-3d24-11eb-902c-2f44266fa6ae.png)
+<p align="center">
+  <img alt="density" src="https://user-images.githubusercontent.com/5798442/101999828-2abbcd80-3d24-11eb-902c-2f44266fa6ae.png">
+</p>
 
 ### boxplot
 
@@ -80,11 +94,13 @@ curl -sL https://git.io/IRIStsv \
 | uplot boxplot -H -t IRIS
 ```
 
-![boxplot](https://user-images.githubusercontent.com/5798442/101999830-2e4f5480-3d24-11eb-8891-728c18bf5b35.png)
+<p align="center">
+  <img alt="boxplot" src="https://user-images.githubusercontent.com/5798442/101999830-2e4f5480-3d24-11eb-8891-728c18bf5b35.png">
+</p>
 
 ### count
 
-In this example, YouPlot counts the number of chromosomes where the gene is located from the human gene annotation file and create a bar chart. The human gene annotation file can be downloaded from the following website.
+In this example, YouPlot counts the number of chromosomes where the gene is located from the human gene annotation file and it creates a bar chart. The human gene annotation file can be downloaded from the following website.
 
 * https://www.gencodegenes.org/human/
 
@@ -94,10 +110,12 @@ cat gencode.v35.annotation.gff3 \
  uplot count -t "The number of human gene annotations per chromosome"  -c blue
 ```
 
-![count](https://user-images.githubusercontent.com/5798442/101999832-30b1ae80-3d24-11eb-96fe-e5000bed1f5c.png)
+<p align="center">
+  <img alt="count" src="https://user-images.githubusercontent.com/5798442/101999832-30b1ae80-3d24-11eb-96fe-e5000bed1f5c.png">
+</p>
 
 Note: `count` is not very fast because it runs in a Ruby script.
-This is fine if the data is small, that is, in most cases. However, if you want to visualize huge data, it is faster to use a combination of common Unix commands as shown below.
+This is fine in most cases, as long as the data size is small. If you want to visualize huge data, it is faster to use a combination of common Unix commands as shown below.
 
 ```sh
 cat gencode.v35.annotation.gff3 | grep -v '#' | grep 'gene' | cut -f1 \
@@ -109,7 +127,7 @@ cat gencode.v35.annotation.gff3 | grep -v '#' | grep 'gene' | cut -f1 \
 
 ### Why YouPlot?
 
-Wouldn't it be a bit of pain to have to run R, Python, Julia, gnuplot or whatever REPL just to check your data?
+Wouldn't it be a pain to have to run R, Python, Julia, gnuplot or whatever REPL just to check your data?
 YouPlot is a command line tool for this purpose. With YouPlot, you can continue working without leaving your terminal and shell.
 
 ### how to use YouPlot?
@@ -129,12 +147,12 @@ The output file or stream for the plot can be specified with the `-o` option.
 
 ### Where to output the input data?
 
-By default, the input data is not output anywhere.
+By default, the input data is not shown anywhere.
 The `-O` option, with no arguments, outputs the input data directly to the standard output. This is useful when passing data to a subsequent pipeline.
 
 ### What types of plots are available?
 
-The following sub-commands are available
+The following sub-commands are available.
 
 | command   | short | how it works                           |
 |-----------|-------|----------------------------------------|
@@ -150,9 +168,29 @@ See Quick Start for `count`.
 
 | command   | short | how it works                                             |
 |-----------|-------|----------------------------------------------------------|
-| count     | c     |  draw a baplot based on the number of occurrences (slow) |
+| count     | c     |  draw a barplot based on the number of occurrences (slow) |
 
-### How to view detailed command line options
+### What if the header line is included?
+
+If your input data contains a header line, you need to specify the `-H` option.
+
+### How to specify the delimiter?
+
+Use the `-d` option. To specify a blank space, you can use `uplot bar -d ' ' data.txt`. You do not need to use `-d` option for tab-delimited text since the default value is tab.
+
+### Is there a way to specify a column as the x-axis or y-axis?
+
+Not yet. In principle, YouPlot treats the first column as the X axis and the second column as the Y axis. When working with multiple series, the first row is the X axis, the second row is series 1, the third row is series 2, and so on. If you pass only one column of data for `line` and `bar`, YouPlot will automatically use a sequential number starting from 1 as the X-axis. The　`--fmt xyy`, `--fmt xyxy` and `--fmt yx` options give you a few more choices. See `youplot <command> --help` for more details. YouPlot has limited functionalities, but you can use shell scripts such as `awk '{print $2, $1}'` to swap lines.
+
+### How to plot real-time data?
+
+Experimental progressive mode is currently under development.
+
+```sh
+ruby -e 'loop{puts rand(100)}' | uplot line --progress
+```
+
+### How to view detailed command line options?
 
 Use `--help` to print command-specific options.
 
@@ -163,7 +201,7 @@ Usage: uplot histogram [options] <in.tsv>
 
 Options for histogram:
         --symbol VAL         character to be used to plot the bars
-        --closed VAL
+        --closed VAL         side of the intervals to be closed [left]
     -n, --nbins VAL          approximate number of bins
 
 Options:
@@ -181,6 +219,7 @@ uplot colors
 * [Report bugs](https://github.com/kojix2/youplot/issues)
 * Fix bugs and [submit pull requests](https://github.com/kojix2/youplot/pulls)
 * Write, clarify, or fix documentation
+  * English corrections by native speakers are welcome.
 * Suggest or add new features
 
 
@@ -194,6 +233,12 @@ bundle exec rake test      # Run the test
 bundle exec rake install   # Installation from source code
 ```
 
+### Acknowledgements
+
+* [Red Data Tools](https://github.com/red-data-tools) - Technical support
+* [sampo grafiikka](https://jypg.net/sampo_grafiikka) - Project logo creation
+* [yutaas](https://github.com/yutaas) - English proofreading
+
 ## License
 
 [MIT License](https://opensource.org/licenses/MIT).

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

@@ -2,8 +2,16 @@
 
 require 'unicode_plot'
 require 'youplot/version'
-require 'youplot/dsv_reader'
+require 'youplot/dsv'
 require 'youplot/command'
 
 module YouPlot
+  class << self
+    attr_accessor :run_as_executable
+
+    def run_as_executable?
+      @run_as_executable
+    end
+  end
+  @run_as_executable = false
 end

lib/youplot/backends/processing.rb

@@ -6,9 +6,9 @@ module YouPlot
     module Processing
       module_function
 
-      def count_values(arr)
+      def count_values(arr, tally: true)
         # tally was added in Ruby 2.7
-        if Enumerable.method_defined? :tally
+        if tally && Enumerable.method_defined?(:tally)
           arr.tally
         else
           # https://github.com/marcandre/backports

lib/youplot/backends/unicode_plot_backend.rb

@@ -7,6 +7,8 @@ module YouPlot
   # plotting functions.
   module Backends
     module UnicodePlotBackend
+      class Error < StandardError; end
+
       module_function
 
       def barplot(data, params, fmt = nil, count: false)
@@ -37,7 +39,19 @@ module YouPlot
           labels = series[x_col]
           values = series[y_col].map(&:to_f)
         end
-        UnicodePlot.barplot(labels, values, **params.to_hc)
+        begin
+          UnicodePlot.barplot(labels, values, **params.to_hc)
+        # UnicodePlot error:
+        # All values have to be positive. Negative bars are not supported.
+        rescue ArgumentError => e
+          if YouPlot.run_as_executable?
+            warn e.backtrace[0]
+            warn "\e[35m#{e}\e[0m"
+            exit 1
+          else
+            raise e
+          end
+        end
       end
 
       def histogram(data, params)
@@ -90,6 +104,7 @@ module YouPlot
           params.name   ||= headers[1]
           params.xlabel ||= headers[0]
         end
+        params.xlim ||= series[0].flatten.minmax # why need?
         params.ylim ||= series[1..-1].flatten.minmax # why need?
         plot = UnicodePlot.public_send(method1, series[0], series[1], **params.to_hc)
         2.upto(series.size - 1) do |i|
@@ -103,13 +118,14 @@ module YouPlot
         series = data.series
         method2 = get_method2(method1)
         series.map! { |s| s.map(&:to_f) }
-        series = series.each_slice(2).to_a
+        series2 = series.each_slice(2).to_a
+        series = nil
         params.name ||= headers[0] if headers
-        params.xlim = series.map(&:first).flatten.minmax # why need?
+        params.xlim ||= series2.map(&:first).flatten.minmax # why need?
-        params.ylim = series.map(&:last).flatten.minmax  # why need?
+        params.ylim ||= series2.map(&:last).flatten.minmax # why need?
-        x1, y1 = series.shift
+        x1, y1 = series2.shift
         plot = UnicodePlot.public_send(method1, x1, y1, **params.to_hc)
-        series.each_with_index do |(xi, yi), i|
+        series2.each_with_index do |(xi, yi), i|
           UnicodePlot.public_send(method2, plot, xi, yi, name: headers&.[]((i + 1) * 2))
         end
         plot
@@ -179,14 +195,14 @@ 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
+          YouPlot.run_as_executable ? exit(1) : raise(Error)
         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
+          YouPlot.run_as_executable ? exit(1) : raise(Error)
         end
       end
     end

lib/youplot/command.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require_relative 'dsv_reader'
+require_relative 'dsv'
 require_relative 'command/parser'
 
 # FIXME
@@ -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
@@ -31,6 +36,18 @@ module YouPlot
       if %i[colors color colours colour].include? @command
         plot = create_plot
         output_plot(plot)
+      elsif options[:progressive]
+        stop = false
+        Signal.trap(:INT) { stop = true }
+        options[:output].print "\e[?25l" # make cursor invisible
+        while (input = Kernel.gets)
+          n = main_progressive(input)
+          break if stop
+
+          options[:output].print "\e[#{n}F"
+        end
+        options[:output].print "\e[0J"
+        options[:output].print "\e[?25h" # make cursor visible
       else
         # Sometimes the input file does not end with a newline code.
         while (input = Kernel.gets(nil))
@@ -52,9 +69,31 @@ module YouPlot
       output_plot(plot)
     end
 
+    def main_progressive(input)
+      output_data(input)
+
+      # FIXME
+      # Worked around the problem of not being able to draw
+      # plots when there is only one header line.
+      if @raw_data.nil?
+        @raw_data = String.new
+        if options[:headers]
+          @raw_data << input
+          return
+        end
+      end
+      @raw_data << input
+
+      # FIXME
+      @data = read_dsv(@raw_data)
+
+      plot = create_plot
+      output_plot_progressive(plot)
+    end
+
     def read_dsv(input)
       input = input.dup.force_encoding(options[:encoding]).encode('utf-8') if options[:encoding]
-      DSVReader.input(input, options[:delimiter], options[:headers], options[:transpose])
+      DSV.parse(input, options[:delimiter], options[:headers], options[:transpose])
     end
 
     def create_plot
@@ -106,5 +145,28 @@ module YouPlot
         end
       end
     end
+
+    def output_plot_progressive(plot)
+      case options[:output]
+      when IO
+        # RefactorMe
+        out = StringIO.new(String.new)
+        def out.tty?
+          true
+        end
+        plot.render(out)
+        lines = out.string.lines
+        lines.each do |line|
+          options[:output].print line.chomp
+          options[:output].print "\e[0K"
+          options[:output].puts
+        end
+        options[:output].print "\e[0J"
+        options[:output].flush
+        out.string.lines.size
+      else
+        raise 'In progressive mode, output to a file is not possible.'
+      end
+    end
   end
 end

lib/youplot/command/options.rb

@@ -2,11 +2,12 @@
 
 module YouPlot
   class Command
-    CmdOptions = Struct.new(
+    Options = Struct.new(
       :delimiter,
       :transpose,
       :headers,
       :pass,
+      :progressive,
       :output,
       :fmt,
       :encoding,

lib/youplot/command/parser.rb

@@ -1,18 +1,21 @@
 # frozen_string_literal: true
 
 require 'optparse'
-require_relative 'cmd_options'
+require_relative 'options'
 require_relative 'plot_params'
 
 module YouPlot
   class Command
     class Parser
-      attr_reader :command, :options, :params
+      class Error < StandardError; end
+
+      attr_reader :command, :options, :params,
+                  :main_parser, :sub_parser
 
       def initialize
         @command = nil
 
-        @options = CmdOptions.new(
+        @options = Options.new(
           delimiter: "\t",
           transpose: false,
           headers: nil,
@@ -28,257 +31,265 @@ module YouPlot
       end
 
       def create_default_parser
-        OptionParser.new do |opt|
+        OptionParser.new do |parser|
-          opt.program_name  = 'YouPlot'
+          parser.program_name  = 'YouPlot'
-          opt.version       = YouPlot::VERSION
+          parser.version       = YouPlot::VERSION
-          opt.summary_width = 24
+          parser.summary_width = 24
-          opt.on_tail('') # Add a blank line at the end
+          parser.on_tail('') # Add a blank line at the end
-          opt.separator('')
+          parser.separator('')
-          opt.on('Common options:')
+          parser.on('Common options:')
-          opt.on('-O', '--pass [FILE]', 'file to output input data to [stdout]',
+          parser.on('-O', '--pass [FILE]', 'file to output input data to [stdout]',
-                 'for inserting YouPlot in the middle of Unix pipes') do |v|
+                    'for inserting YouPlot in the middle of Unix pipes') do |v|
-            @options[:pass] = v || $stdout
+            options[:pass] = v || $stdout
           end
-          opt.on('-o', '--output [FILE]', 'file to output plots to [stdout]',
+          parser.on('-o', '--output [FILE]', 'file to output plots to [stdout]',
-                 'If no option is specified, plot will print to stderr') do |v|
+                    'If no option is specified, plot will print to stderr') do |v|
-            @options[:output] = v || $stdout
+            options[:output] = v || $stdout
           end
-          opt.on('-d', '--delimiter VAL', String, 'use DELIM instead of TAB for field delimiter') do |v|
+          parser.on('-d', '--delimiter DELIM', String, 'use DELIM instead of [TAB] for field delimiter') do |v|
-            @options[:delimiter] = v
+            options[:delimiter] = v
           end
-          opt.on('-H', '--headers', TrueClass, 'specify that the input has header row') do |v|
+          parser.on('-H', '--headers', TrueClass, 'specify that the input has header row') do |v|
-            @options[:headers] = v
+            options[:headers] = v
           end
-          opt.on('-T', '--transpose', TrueClass, 'transpose the axes of the input data') do |v|
+          parser.on('-T', '--transpose', TrueClass, 'transpose the axes of the input data') do |v|
-            @options[:transpose] = v
+            options[:transpose] = v
           end
-          opt.on('-t', '--title VAL', String, 'print string on the top of plot') do |v|
+          parser.on('-t', '--title STR', String, 'print string on the top of plot') do |v|
             params.title = v
           end
-          opt.on('-x', '--xlabel VAL', String, 'print string on the bottom of the plot') do |v|
+          parser.on('-x', '--xlabel STR', String, 'print string on the bottom of the plot') do |v|
             params.xlabel = v
           end
-          opt.on('-y', '--ylabel VAL', String, 'print string on the far left of the plot') do |v|
+          parser.on('-y', '--ylabel STR', String, 'print string on the far left of the plot') do |v|
             params.ylabel = v
           end
-          opt.on('-w', '--width VAL', Integer, 'number of characters per row') do |v|
+          parser.on('-w', '--width INT', Integer, 'number of characters per row') do |v|
             params.width = v
           end
-          opt.on('-h', '--height VAL', Numeric, 'number of rows') do |v|
+          parser.on('-h', '--height INT', Numeric, 'number of rows') do |v|
             params.height = v
           end
-          opt.on('-b', '--border VAL', String, 'specify the style of the bounding box') do |v|
+          parser.on('-b', '--border STR', String, 'specify the style of the bounding box') do |v|
             params.border = v.to_sym
           end
-          opt.on('-m', '--margin VAL', Numeric, 'number of spaces to the left of the plot') do |v|
+          parser.on('-m', '--margin INT', Numeric, 'number of spaces to the left of the plot') do |v|
             params.margin = v
           end
-          opt.on('-p', '--padding VAL', Numeric, 'space of the left and right of the plot') do |v|
+          parser.on('--padding INT', Numeric, 'space of the left and right of the plot') do |v|
             params.padding = v
           end
-          opt.on('-c', '--color VAL', String, 'color of the drawing') do |v|
+          parser.on('-c', '--color VAL', String, 'color of the drawing') do |v|
             params.color = v =~ /\A[0-9]+\z/ ? v.to_i : v.to_sym
           end
-          opt.on('--[no-]labels', TrueClass, 'hide the labels') do |v|
+          parser.on('--[no-]labels', TrueClass, 'hide the labels') do |v|
             params.labels = v
           end
-          opt.on('--progress', TrueClass, 'progressive') do |v|
+          parser.on('-p', '--progress', TrueClass, 'progressive mode [experimental]') do |v|
-            @options[:progressive] = v
+            options[:progressive] = v
           end
-          opt.on('--encoding VAL', String, 'Specify the input encoding') do |v|
+          parser.on('--encoding STR', String, 'Specify the input encoding') do |v|
-            @options[:encoding] = v
+            options[:encoding] = v
           end
           # Optparse adds the help option, but it doesn't show up in usage.
           # This is why you need the code below.
-          opt.on('--help', 'print sub-command help menu') do
+          parser.on('--help', 'print sub-command help menu') do
-            puts opt.help
+            puts parser.help
-            exit
+            exit if YouPlot.run_as_executable?
           end
-          opt.on('--debug', TrueClass, 'print preprocessed data') do |v|
+          parser.on('--debug', TrueClass, 'print preprocessed data') do |v|
-            @options[:debug] = v
+            options[:debug] = v
           end
-          yield opt if block_given?
+          # yield opt if block_given?
         end
       end
 
-      def main_parser
+      def create_main_parser
-        @main_parser ||= create_default_parser do |main_parser|
+        @main_parser = create_default_parser
-          # Here, help message is stored in the banner.
+        main_parser.banner = \
-          # Because help of main_parser may be referred by `sub_parser`.
+          <<~MSG
 
-          main_parser.banner = \
+            Program: YouPlot (Tools for plotting on the terminal)
-            <<~MSG
+            Version: #{YouPlot::VERSION} (using UnicodePlot #{UnicodePlot::VERSION})
+            Source:  https://github.com/kojix2/youplot
 
-              Program: YouPlot (Tools for plotting on the terminal)
+            Usage:   uplot <command> [options] <in.tsv>
-              Version: #{YouPlot::VERSION} (using UnicodePlot #{UnicodePlot::VERSION})
-              Source:  https://github.com/kojix2/youplot
 
-              Usage:   uplot <command> [options] <in.tsv>
+            Commands:
+                barplot    bar           draw a horizontal barplot
+                histogram  hist          draw a horizontal histogram
+                lineplot   line          draw a line chart
+                lineplots  lines         draw a line chart with multiple series
+                scatter    s             draw a scatter plot
+                density    d             draw a density plot
+                boxplot    box           draw a horizontal boxplot
+                colors     color         show the list of available colors
 
-              Commands:
+                count      c             draw a baplot based on the number of
-                  barplot    bar           draw a horizontal barplot
+                                         occurrences (slow)
-                  histogram  hist          draw a horizontal histogram
-                  lineplot   line          draw a line chart
-                  lineplots  lines         draw a line chart with multiple series
-                  scatter    s             draw a scatter plot
-                  density    d             draw a density plot
-                  boxplot    box           draw a horizontal boxplot
-                  colors     color         show the list of available colors
 
-                  count      c             draw a baplot based on the number of 
+            General options:
-                                           occurrences (slow)
+                --help                   print command specific help menu
+                --version                print the version of YouPlot
+          MSG
 
-              General options:
+        # Help for the main parser is simple.
-                  --help                   print command specific help menu
+        # Simply show the banner above.
-                  --version                print the version of YouPlot 
+        main_parser.on('--help', 'print sub-command help menu') do
-            MSG
+          puts main_parser.banner
-
+          puts
-          # Actually, main_parser can take common optional arguments.
+          exit if YouPlot.run_as_executable?
-          # However, these options dose not be shown in the help menu.
-          # I think the main help should be simple.
-          main_parser.on('--help', 'print sub-command help menu') do
-            puts main_parser.banner
-            puts
-            exit
-          end
         end
       end
 
-      def sub_parser
+      def sub_parser_add_symbol
-        @sub_parser ||= create_default_parser do |parser|
+        sub_parser.on_head('--symbol STR', String, 'character to be used to plot the bars') do |v|
-          parser.banner = <<~MSG
+          params.symbol = v
+        end
+      end
+
+      def sub_parser_add_xscale
+        xscale_options = UnicodePlot::ValueTransformer::PREDEFINED_TRANSFORM_FUNCTIONS.keys.join(', ')
+        sub_parser.on_head('--xscale STR', String, "axis scaling (#{xscale_options})") do |v|
+          params.xscale = v
+        end
+      end
+
+      def sub_parser_add_canvas
+        sub_parser.on_head('--canvas STR', String, 'type of canvas') do |v|
+          params.canvas = v.to_sym
+        end
+      end
+
+      def sub_parser_add_xlim
+        sub_parser.on_head('--xlim FLOAT,FLOAT', Array, 'plotting range for the x coordinate') do |v|
+          params.xlim = v.take(2)
+        end
+      end
+
+      def sub_parser_add_ylim
+        sub_parser.on_head('--ylim FLOAT,FLOAT', Array, 'plotting range for the y coordinate') do |v|
+          params.ylim = v.take(2)
+        end
+      end
+
+      def sub_parser_add_grid
+        sub_parser.on_head('--[no-]grid', TrueClass, 'draws grid-lines at the origin') do |v|
+          params.grid = v
+        end
+      end
+
+      def create_sub_parser
+        @sub_parser = create_default_parser
+        sub_parser.banner = \
+          <<~MSG
 
             Usage: YouPlot #{command} [options] <in.tsv>
 
             Options for #{command}:
           MSG
 
-          case command
+        case command
 
-          # If you type only `uplot` in the terminal.
+        # If you type only `uplot` in the terminal.
-          when nil
+        when nil
-            warn main_parser.banner
+          warn main_parser.banner
-            warn "\n"
+          warn "\n"
+          exit 1 if YouPlot.run_as_executable?
+
+        when :barplot, :bar
+          sub_parser_add_symbol
+          sub_parser.on_head('--fmt STR', String, 'xy : header is like x, y...', 'yx : header is like y, x...') do |v|
+            options[:fmt] = v
+          end
+          sub_parser_add_xscale
+
+        when :count, :c
+          sub_parser_add_symbol
+          sub_parser_add_xscale
+
+        when :histogram, :hist
+          sub_parser_add_symbol
+          sub_parser.on_head('--closed STR', String, 'side of the intervals to be closed [left]') do |v|
+            params.closed = v
+          end
+          sub_parser.on_head('-n', '--nbins INT', Numeric, 'approximate number of bins') do |v|
+            params.nbins = v
+          end
+
+        when :lineplot, :line
+          sub_parser_add_canvas
+          sub_parser_add_grid
+          sub_parser.on_head('--fmt STR', String, 'xy : header is like x, y...', 'yx : header is like y, x...') do |v|
+            options[:fmt] = v
+          end
+          sub_parser_add_ylim
+          sub_parser_add_xlim
+
+        when :lineplots, :lines
+          sub_parser_add_canvas
+          sub_parser_add_grid
+          sub_parser.on_head('--fmt STR', String, 'xyxy : header is like x1, y1, x2, y2, x3, y3...',
+                             'xyy  : header is like x, y1, y2, y2, y3...') do |v|
+            options[:fmt] = v
+          end
+          sub_parser_add_ylim
+          sub_parser_add_xlim
+
+        when :scatter, :s
+          sub_parser_add_canvas
+          sub_parser_add_grid
+          sub_parser.on_head('--fmt STR', String, 'xyxy : header is like x1, y1, x2, y2, x3, y3...',
+                             'xyy  : header is like x, y1, y2, y2, y3...') do |v|
+            options[:fmt] = v
+          end
+          sub_parser_add_ylim
+          sub_parser_add_xlim
+
+        when :density, :d
+          sub_parser_add_canvas
+          sub_parser_add_grid
+          sub_parser.on('--fmt STR', String, 'xyxy : header is like x1, y1, x2, y2, x3, y3...',
+                        'xyy  : header is like x, y1, y2, y2, y3...') do |v|
+            options[:fmt] = v
+          end
+          sub_parser_add_ylim
+          sub_parser_add_xlim
+
+        when :boxplot, :box
+          sub_parser_add_xlim
+
+        when :colors, :color, :colours, :colour
+          sub_parser.on_head('-n', '--names', 'show color names only', TrueClass) do |v|
+            options[:color_names] = v
+          end
+
+        else
+          error_message = "uplot: unrecognized command '#{command}'"
+          if YouPlot.run_as_executable?
+            warn error_message
             exit 1
-
-          when :barplot, :bar
-            parser.on_head('--symbol VAL', String, 'character to be used to plot the bars') do |v|
-              params.symbol = v
-            end
-            parser.on_head('--xscale VAL', String, 'axis scaling') do |v|
-              params.xscale = v
-            end
-            parser.on_head('--fmt VAL', String, 'xy : header is like x, y...', 'yx : header is like y, x...') do |v|
-              @options[:fmt] = v
-            end
-
-          when :count, :c
-            parser.on_head('--symbol VAL', String, 'character to be used to plot the bars') do |v|
-              params.symbol = v
-            end
-
-          when :histogram, :hist
-            parser.on_head('-n', '--nbins VAL', Numeric, 'approximate number of bins') do |v|
-              params.nbins = v
-            end
-            parser.on_head('--closed VAL', String) do |v|
-              params.closed = v
-            end
-            parser.on_head('--symbol VAL', String, 'character to be used to plot the bars') do |v|
-              params.symbol = v
-            end
-
-          when :lineplot, :line
-            parser.on_head('--canvas VAL', String, 'type of canvas') do |v|
-              params.canvas = v
-            end
-            parser.on_head('--xlim VAL', Array, 'plotting range for the x coordinate') do |v|
-              params.xlim = v.take(2)
-            end
-            parser.on_head('--ylim VAL', Array, 'plotting range for the y coordinate') do |v|
-              params.ylim = v.take(2)
-            end
-            parser.on_head('--fmt VAL', String, 'xy : header is like x, y...', 'yx : header is like y, x...') do |v|
-              @options[:fmt] = v
-            end
-
-          when :lineplots, :lines
-            parser.on_head('--canvas VAL', String) do |v|
-              params.canvas = v
-            end
-            parser.on_head('--xlim VAL', Array, 'plotting range for the x coordinate') do |v|
-              params.xlim = v.take(2)
-            end
-            parser.on_head('--ylim VAL', Array, 'plotting range for the y coordinate') do |v|
-              params.ylim = v.take(2)
-            end
-            parser.on_head('--fmt VAL', String, 'xyxy : header is like x1, y1, x2, y2, x3, y3...',
-                           'xyy  : header is like x, y1, y2, y2, y3...') do |v|
-              @options[:fmt] = v
-            end
-
-          when :scatter, :s
-            parser.on_head('--canvas VAL', String) do |v|
-              params.canvas = v
-            end
-            parser.on_head('--xlim VAL', Array, 'plotting range for the x coordinate') do |v|
-              params.xlim = v.take(2)
-            end
-            parser.on_head('--ylim VAL', Array, 'plotting range for the y coordinate') do |v|
-              params.ylim = v.take(2)
-            end
-            parser.on_head('--fmt VAL', String, 'xyxy : header is like x1, y1, x2, y2, x3, y3...',
-                           'xyy  : header is like x, y1, y2, y2, y3...') do |v|
-              @options[:fmt] = v
-            end
-
-          when :density, :d
-            parser.on_head('--grid', TrueClass) do |v|
-              params.grid = v
-            end
-            parser.on_head('--xlim VAL', Array, 'plotting range for the x coordinate') do |v|
-              params.xlim = v.take(2)
-            end
-            parser.on_head('--ylim VAL', Array, 'plotting range for the y coordinate') do |v|
-              params.ylim = v.take(2)
-            end
-            parser.on('--fmt VAL', String, 'xyxy : header is like x1, y1, x2, y2, x3, y3...',
-                      'xyy  : header is like x, y1, y2, y2, y3...') do |v|
-              @options[:fmt] = v
-            end
-
-          when :boxplot, :box
-            parser.on_head('--xlim VAL', Array, 'plotting range for the x coordinate') do |v|
-              params.xlim = v.take(2)
-            end
-
-          when :colors, :color, :colours, :colour
-            parser.on_head('-n', '--names', 'show color names only', TrueClass) do |v|
-              @options[:color_names] = v
-            end
-
           else
-            warn "uplot: unrecognized command '#{command}'"
+            raise Error, error_message
-            exit 1
           end
         end
       end
 
       def parse_options(argv = ARGV)
         begin
-          main_parser.order!(argv)
+          create_main_parser.order!(argv)
         rescue OptionParser::ParseError => e
           warn "uplot: #{e.message}"
-          exit 1
+          exit 1 if YouPlot.run_as_executable?
         end
 
         @command = argv.shift&.to_sym
 
         begin
-          sub_parser.parse!(argv)
+          create_sub_parser&.parse!(argv)
         rescue OptionParser::ParseError => e
           warn "uplot: #{e.message}"
-          exit 1
+          exit 1 if YouPlot.run_as_executable?
         end
       end
     end

lib/youplot/dsv.rb

@@ -4,10 +4,10 @@ require 'csv'
 
 module YouPlot
   # Read and interpret Delimiter-separated values format file or stream.
-  module DSVReader
+  module DSV
     module_function
 
-    def input(input, delimiter, headers, transpose)
+    def parse(input, delimiter, headers, transpose)
       arr = parse_as_csv(input, delimiter)
       headers = get_headers(arr, headers, transpose)
       series = get_series(arr, headers, transpose)
@@ -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
@@ -57,14 +57,18 @@ module YouPlot
     end
 
     def get_series(arr, headers, transpose)
-      if transpose
+      if headers
-        if headers
+        if arr.size > 1
-          arr.map { |row| row[1..-1] }
+          if transpose
+            arr.map { |row| row[1..-1] }
+          else
+            transpose2(arr[1..-1])
+          end
         else
-          arr
+          Array.new(arr[0].size, [])
         end
-      elsif headers
+      elsif transpose
-        transpose2(arr[1..-1])
+        arr
       else
         transpose2(arr)
       end

lib/youplot/version.rb

@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module YouPlot
-  VERSION = '0.3.2'
+  VERSION = '0.3.4'
 end

test/fixtures/iris-count.txt

@@ -0,0 +1,38 @@
+                     sepal_length
+       ┌                                        ┐ 
+   5.0 ┤■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■ 10.0   
+   6.3 ┤■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■ 9.0       
+   5.1 ┤■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■ 9.0       
+   6.7 ┤■■■■■■■■■■■■■■■■■■■■■■■■■■■ 8.0           
+   5.7 ┤■■■■■■■■■■■■■■■■■■■■■■■■■■■ 8.0           
+   6.4 ┤■■■■■■■■■■■■■■■■■■■■■■■■ 7.0              
+   5.5 ┤■■■■■■■■■■■■■■■■■■■■■■■■ 7.0              
+   5.8 ┤■■■■■■■■■■■■■■■■■■■■■■■■ 7.0              
+   5.6 ┤■■■■■■■■■■■■■■■■■■■■ 6.0                  
+   6.1 ┤■■■■■■■■■■■■■■■■■■■■ 6.0                  
+   6.0 ┤■■■■■■■■■■■■■■■■■■■■ 6.0                  
+   5.4 ┤■■■■■■■■■■■■■■■■■■■■ 6.0                  
+   4.9 ┤■■■■■■■■■■■■■■■■■■■■ 6.0                  
+   6.5 ┤■■■■■■■■■■■■■■■■■ 5.0                     
+   4.8 ┤■■■■■■■■■■■■■■■■■ 5.0                     
+   7.7 ┤■■■■■■■■■■■■■■ 4.0                        
+   6.2 ┤■■■■■■■■■■■■■■ 4.0                        
+   6.9 ┤■■■■■■■■■■■■■■ 4.0                        
+   5.2 ┤■■■■■■■■■■■■■■ 4.0                        
+   4.6 ┤■■■■■■■■■■■■■■ 4.0                        
+   7.2 ┤■■■■■■■■■■ 3.0                            
+   6.8 ┤■■■■■■■■■■ 3.0                            
+   5.9 ┤■■■■■■■■■■ 3.0                            
+   4.4 ┤■■■■■■■■■■ 3.0                            
+   6.6 ┤■■■■■■■ 2.0                               
+   4.7 ┤■■■■■■■ 2.0                               
+   7.9 ┤■■■ 1.0                                   
+   7.4 ┤■■■ 1.0                                   
+   7.3 ┤■■■ 1.0                                   
+   7.6 ┤■■■ 1.0                                   
+   7.1 ┤■■■ 1.0                                   
+   7.0 ┤■■■ 1.0                                   
+   5.3 ┤■■■ 1.0                                   
+   4.5 ┤■■■ 1.0                                   
+   4.3 ┤■■■ 1.0                                   
+       └                                        ┘ 

test/fixtures/iris-density.txt

@@ -1,20 +1,20 @@
                      IRIS-DENSITY
        ┌────────────────────────────────────────┐             
-   6.9 │                                        │ sepal_width 
+   6.9 │                                     ░  │ sepal_width 
        │                                        │ petal_length
-       │                                        │ petal_width 
+       │                          ░             │ petal_width 
-       │                                        │ species     
+       │                ░      ░░               │ species     
-       │                    ░                   │             
+       │                   ░  ░                 │             
-       │                                        │             
        │               ░                        │             
-       │          ░                             │             
+       │        ░   ░░  ░                       │             
-       │       ░            ░   ░░ ░            │             
+       │       ▒░             ░                 │             
-       │               ░  ░    ░                │             
+       │ ░   ░░       ░░ ░ ░   ░░ ░░░           │             
+       │             ░  ░     ░   ░             │             
+       │                       ░░   ░        ░  │             
+       │   ░ ░░░▒ ░ ░    ░░░  ░   ░             │             
+       │       ░     ░░░░                       │             
        │                                        │             
-       │       ░ ░▒ ░ ░     ░  ░                │             
+     0 │ ░ ▒░▒▒██ ▒ ▓▒░▒▒░░░ ░▒▒░ ▒░░   ░    ░  │             
-       │          ░    ░ ░                      │             
-       │                                        │             
-     0 │    ░░ ▒ ░█ ░ ░▒ ░░ ░  ░░░ ░            │             
        └────────────────────────────────────────┘             
-       4                                        8
+       4.3                                    7.9
                      sepal_length

test/fixtures/iris-lineplots.txt

@@ -1,20 +1,20 @@
                     IRIS-LINEPLOTS
        ┌────────────────────────────────────────┐             
-   6.9 │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣀⣤⣲⠭⠃⠀⠀│ sepal_width 
+   6.9 │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣀⣠⣴⡮⠟⠀⠀│ sepal_width 
-       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡀⠀⠀⠀⢀⣀⣠⣤⣶⣿⣿⣯⣴⣒⠖⠉⠁│ petal_length
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡀⠀⠀⠀⠀⣀⣀⣤⣴⣶⣿⣟⣯⣥⣔⣲⠊⠉│ petal_length
-       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣤⢮⣤⣤⣶⣿⣿⣿⠿⠛⠛⠋⠉⠀⠀⠀⠀⠀⠀│ petal_width 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣔⢾⣥⣤⣶⣿⣿⣿⣿⠿⠛⠛⠋⠉⠀⠀⠀⠀⠀⠀│ petal_width 
-       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣀⣤⣴⣷⣿⣿⣿⣿⣿⣿⣟⣟⡂⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│ species     
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣀⣠⣤⣾⣿⣿⣿⣿⣿⣿⣿⣿⣛⣗⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│ species     
-       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣀⠤⠔⠒⢙⡻⠝⢋⡽⢝⣳⣾⣫⣥⣒⣪⣵⣖⣂⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀│             
+       │⠀⠀⠀⠀⠀⠀⠀⠀⣀⣀⠤⠔⠒⣋⡻⠭⠛⣩⡿⣟⣷⣽⣫⣥⣒⣲⣭⣶⣒⣀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│             
-       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠉⠁⠀⠀⢀⣉⣟⣻⣿⣻⣿⣿⣿⠿⣿⣿⠿⠟⡢⠒⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│             
+       │⠀⠀⠀⠀⠀⠀⠈⠉⠀⠀⠀⢀⣉⡟⣛⣿⣝⣻⣿⣿⣿⠿⢿⣿⡿⠿⣛⠤⠊⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│             
-       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣠⣤⣿⣷⣾⣿⡿⣿⡯⠿⠛⠋⠉⠀⣀⠔⠉⠀⠀⠀⠀⠀⠀⠀⠀⢀⣀⣄⣀⠄│             
+       │⠀⠀⠀⠀⠀⠀⠀⢀⣠⣤⣿⣷⣿⣿⣿⣿⣿⠿⠿⠛⠋⠉⠁⣀⠔⠊⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣀⣠⢀⣠│             
-       │⠀⠀⠀⠀⢀⣨⣽⣿⣿⣿⣿⣿⣿⣿⣵⣚⣉⣃⣀⣠⣤⣤⣔⣮⣤⣄⣀⣠⣤⣔⣲⣾⡳⠮⠛⠋⢉⡗⠁⠀│             
+       │⠀⢀⣀⣭⣿⣿⣿⣿⣿⣿⣿⣿⣽⣖⣋⣙⣀⣀⣤⣤⣤⣔⣮⣤⣄⣀⣀⣤⣤⣔⣶⣾⡳⠮⠝⠓⢊⢽⠋⠀│             
-       │⠀⠀⠐⠒⡿⠿⠟⡻⠛⠛⠛⠚⠉⠀⠲⣶⣿⣷⣾⣷⣿⣿⣷⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣷⣶⣶⣷⡇⠀⠀│             
+       │⠒⢷⠿⠿⢛⠟⠛⠙⠑⠚⠉⠀⠲⣶⣿⣿⣶⣿⣷⣿⣿⣷⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣷⣶⣶⣷⣾⠀⠀│             
-       │⠀⠀⠀⠀⢱⡠⠊⠀⠀⣤⣤⣶⣿⣿⠿⣿⣿⣿⣿⣿⣟⣿⣿⣟⣟⣉⣉⣝⣛⣫⣭⣥⣤⣤⣔⣒⣒⡃⠀⠀│             
+       │⠀⠸⡠⠔⠁⠀⢠⡤⣴⣶⣿⣿⠿⣿⣿⣿⢿⣿⣿⣿⣿⣿⣟⣟⣉⣉⣩⣛⣛⣭⣭⣥⣤⣤⣔⣒⣒⡚⠀⠀│             
-       │⠀⠀⠀⠀⠀⠁⠀⢀⡀⠀⢯⠒⠉⡠⠔⠡⠤⠮⣤⣴⣿⣿⣿⣿⣿⣿⣿⣿⣿⣷⣿⣶⣶⣶⣶⣿⣿⠥⠤⠄│             
+       │⠀⠀⠁⠀⠀⢀⡀⠨⢞⠊⢉⡠⠔⠉⠤⠴⢥⣴⣾⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣶⣷⣶⣶⣶⣶⣿⣿⡭⠤⠤│             
-       │⠀⠀⠀⠀⣀⣠⣄⣤⣭⣿⣿⣿⣿⣿⣿⣿⣿⣯⣯⣯⣭⣽⣿⣿⣿⣿⣿⣯⣭⣍⡙⠛⠝⠉⠀⠀⠀⠀⠀⠀│             
+       │⠀⣀⣀⣄⣤⣤⣽⣿⣿⣿⣿⣿⣿⡿⣿⣿⣽⣽⣯⣭⣿⣿⣿⣿⣿⣿⣿⣭⣭⣉⠛⠛⠝⠉⠀⠀⠀⠀⠀⠀│             
-       │⠀⠀⠠⠴⠿⢯⠭⠿⠯⣭⣷⡾⠿⠿⠿⣿⢿⡿⡻⠿⡟⠛⢛⣛⠯⠭⠒⠒⠉⠉⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│             
+       │⠤⠿⠿⡯⠽⠿⢭⣽⣶⡾⠿⠿⠿⣿⠿⣿⢟⠿⢻⠟⠛⣛⣛⠯⠭⠝⠒⠊⠉⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│             
-       │⠀⠀⠀⠀⠀⠀⠀⠀⣀⣀⣄⠀⠀⠀⢀⣀⡠⠤⠔⠒⠊⠉⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│             
+       │⠀⠀⠀⠀⠀⢀⣀⡠⣀⠀⠀⠀⢀⣀⡠⠤⠤⠒⠒⠉⠉⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│             
-     0 │⠀⠀⢀⣀⣴⣶⣾⣿⣿⣿⣿⣿⣿⣿⣿⣿⣻⣷⣄⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⡀│             
+     0 │⣀⣴⣶⣾⣿⣷⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣦⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀│             
        └────────────────────────────────────────┘             
-       4                                        8
+       4.3                                    7.9
                      sepal_length

test/fixtures/iris-scatter.txt

@@ -1,20 +1,20 @@
                      IRIS-SCATTER
        ┌────────────────────────────────────────┐             
-   6.9 │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠄⠃⠀⠀│ sepal_width 
+   6.9 │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠠⠘⠀⠀│ sepal_width 
-       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡀⠀⠀⠀⠀⠀⠀⠀⠀⡄⠂⠄⠀⠀⠄⠀⠁│ petal_length
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡄⠂⠄⠀⠀⠠⠀⠈│ petal_length
-       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⠀⠀⡀⡀⠂⠀⡆⠁⠄⠈⠀⠂⠀⠀⠀⠀⠀⠀⠀│ petal_width 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⠀⠀⡀⡀⠂⠀⢰⠈⠠⠀⠀⠁⠂⠀⠀⠀⠀⠀⠀⠀│ petal_width 
-       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡀⡀⡀⠀⠂⡀⠃⡅⠀⠄⠁⡂⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│ species     
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⢀⢀⠀⠀⠂⡀⠃⡅⠀⠠⠈⢐⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│ species     
-       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠐⠀⠁⠀⠄⢕⠀⠄⡃⠀⠀⠀⡁⠄⠂⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀│             
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠂⠈⠀⠠⠨⢐⠀⠄⡃⠀⠀⠀⢈⠠⠐⢀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│             
-       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠁⠀⠀⠀⠀⠁⣊⠀⡃⠀⡀⠉⠀⠅⠂⠅⠙⠀⠂⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│             
+       │⠀⠀⠀⠀⠀⠀⠈⠀⠀⠀⠀⠀⠁⡂⡁⢘⠀⢀⠈⠈⠀⠅⠂⠅⠁⠘⠐⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│             
-       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢠⠀⢅⠀⡄⡮⠀⠅⠇⠀⠒⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠄⠀⠄│             
+       │⠀⠀⠀⠀⠀⠀⠀⠀⢠⠀⠅⡀⡄⡆⠅⠨⠸⠀⠐⠐⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠠⠀⠠│             
-       │⠀⠀⠀⠀⠀⠨⠀⠠⠀⡀⣷⠀⠆⠀⠄⠊⠀⠂⠀⠀⠄⠀⠄⡄⠀⠀⠀⡀⠀⠀⠀⠀⠁⠀⠀⠀⠀⠀⠀⠀│             
+       │⠀⠀⠀⠅⠀⠠⢀⢸⢰⠀⠆⠀⠄⠂⠁⠐⠀⠀⠠⠀⠀⠄⡄⠀⠀⠀⢀⠀⠀⠀⠀⠀⠁⠀⠀⠀⠀⠀⠀⠀│             
-       │⠀⠀⠐⠀⠇⠘⠀⠑⠀⠂⠓⠀⠀⠀⠂⢰⠀⡆⡀⠃⢶⠀⡄⡄⡇⡳⠀⠂⡃⠃⠑⠀⠃⠄⡀⠀⠂⡂⠀⠀│             
+       │⠂⠇⠀⠃⠁⠐⠐⠘⠐⠀⠀⠀⠂⠀⡆⢰⢀⠘⠰⢰⠀⡄⡄⡇⡃⠰⠐⢘⠘⠈⠀⠂⠃⠄⡀⠀⠐⢐⠀⠀│             
-       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⡄⠠⠀⠁⠀⠀⡮⠀⠆⡃⠀⠑⠀⠀⡅⠁⠀⠀⡄⠀⠀⠀⠀⠄⠀⠀⠀⠀⠂⠀⠀│             
+       │⠀⠀⠀⠀⠀⠀⢠⠀⠠⠀⠁⠀⠀⡆⠅⠰⢘⠀⠈⠐⠀⠀⡅⠁⠀⠀⢠⠀⠀⠀⠀⠀⠄⠀⠀⠀⠀⠐⠀⠀│             
-       │⠀⠀⠀⠀⠀⠁⠀⢀⠀⠀⢅⠀⠀⠀⠀⠡⠀⠄⡀⠀⠁⠀⠁⡁⡃⠅⠀⠃⠃⠃⠐⠀⠀⠀⡀⠀⠂⠅⠀⠄│             
+       │⠀⠀⠁⠀⠀⢀⠀⠨⢀⠀⠀⠀⠀⠁⠄⠠⢀⠀⠈⠀⠀⠁⡁⡃⠅⠀⠘⠘⠘⠀⠀⠂⠀⠀⡀⠀⠐⠨⠀⠠│             
-       │⠀⠀⠀⠀⡀⢠⠀⢤⠀⡆⣴⠀⡤⠀⠆⡠⠀⠆⠀⠅⢍⠀⠅⠅⠅⢅⠀⡇⡀⠄⡀⠀⠅⠁⠀⠀⠀⠀⠀⠀│             
+       │⠀⡀⠀⡄⠄⢠⢰⢠⢰⠀⡄⠄⠆⡀⠄⠰⠀⠨⠨⢈⠀⠅⠅⠅⠅⢀⢸⢀⠠⢀⠀⠀⠅⠁⠀⠀⠀⠀⠀⠀│             
-       │⠀⠀⠠⠀⠁⢁⠀⠁⠀⡀⡣⠀⠀⠀⠁⡯⠀⡃⡂⠀⡘⠀⠁⠁⠁⠈⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│             
+       │⠄⠁⠁⡀⠁⠀⢀⢘⠠⠀⠀⠀⠁⡇⠅⢘⢐⠀⢀⠘⠀⠁⠁⠁⠀⠈⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│             
-       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢄⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│             
+       │⠀⠀⠀⠀⠀⠀⠀⠠⢀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│             
-     0 │⠀⠀⢀⠀⡄⣲⠀⣴⠀⡄⣿⠀⣤⠀⡅⣄⠀⡃⡄⡀⣀⠀⡀⡀⡀⣀⠀⡀⡀⡀⣀⠀⡀⡀⡀⠀⡀⡀⠀⡀│             
+     0 │⡀⡄⡂⡆⡄⢰⢠⢸⢸⠀⡄⡄⡅⡄⡀⢘⢠⢀⢀⢀⠀⡀⡀⡀⡀⢀⢀⢀⢀⢀⠀⡀⡀⡀⡀⠀⢀⢀⠀⢀│             
        └────────────────────────────────────────┘             
-       4                                        8
+       4.3                                    7.9
                      sepal_length

test/fixtures/simple-boxplot.txt

@@ -0,0 +1,6 @@
+     ┌                                        ┐ 
+      ╷       ┌──────────┬──────────┐        ╷  
+   1  ├───────┤          │          ├────────┤  
+      ╵       └──────────┴──────────┘        ╵  
+     └                                        ┘ 
+     -50                 0                   50

test/fixtures/simple-histogram.txt

@@ -0,0 +1,9 @@
+                  ┌                                        ┐ 
+   [-60.0, -40.0) ┤▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇ 1                     
+   [-40.0, -20.0) ┤▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇ 2   
+   [-20.0,   0.0) ┤▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇ 2   
+   [  0.0,  20.0) ┤▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇ 1                     
+   [ 20.0,  40.0) ┤▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇ 2   
+   [ 40.0,  60.0) ┤▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇ 2   
+                  └                                        ┘ 
+                                  Frequency

test/fixtures/simple-lineplot-height-17.txt

@@ -0,0 +1,20 @@
+       ┌────────────────────────────────────────┐ 
+    50 │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡄⠀⠀⠀⠀⠀⠀⠀⢸│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸⡇⠀⠀⠀⠀⠀⠀⠀⡇│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡆⠀⠀⠀⠀⠀⠀⠀⡸⢸⠀⠀⠀⠀⠀⠀⠀⡇│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸⢸⠀⠀⠀⠀⠀⠀⠀⡇⠸⡀⠀⠀⠀⠀⠀⢸⠀│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢠⢣⠀⠀⠀⠀⠀⠀⠀⡇⠘⡄⠀⠀⠀⠀⠀⢰⠁⠀⡇⠀⠀⠀⠀⠀⡸⠀│ 
+       │⠀⠀⠀⠀⡀⠀⠀⠀⠀⠀⠀⠀⡎⠘⡄⠀⠀⠀⠀⠀⢰⠁⠀⢇⠀⠀⠀⠀⠀⡸⠀⠀⢣⠀⠀⠀⠀⠀⡇⠀│ 
+       │⠀⠀⢀⠜⠘⡄⠀⠀⠀⠀⠀⢸⠀⠀⢱⠀⠀⠀⠀⠀⡜⠀⠀⢸⠀⠀⠀⠀⠀⡇⠀⠀⢸⠀⠀⠀⠀⢀⠇⠀│ 
+       │⠤⢤⠮⠤⠤⠼⡤⠤⠤⠤⢤⠧⠤⠤⠬⡦⠤⠤⠤⢤⠧⠤⠤⠬⡦⠤⠤⠤⢴⠥⠤⠤⠬⡦⠤⠤⠤⢼⠤⠤│ 
+       │⡰⠁⠀⠀⠀⠀⠱⡀⠀⠀⡜⠀⠀⠀⠀⢱⠀⠀⠀⡸⠀⠀⠀⠀⢣⠀⠀⠀⡸⠀⠀⠀⠀⢇⠀⠀⠀⡸⠀⠀│ 
+       │⠁⠀⠀⠀⠀⠀⠀⢣⠀⢰⠁⠀⠀⠀⠀⠈⡆⠀⢀⠇⠀⠀⠀⠀⠸⡀⠀⠀⡇⠀⠀⠀⠀⢸⠀⠀⠀⡇⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⢣⠇⠀⠀⠀⠀⠀⠀⢱⠀⢸⠀⠀⠀⠀⠀⠀⡇⠀⢰⠁⠀⠀⠀⠀⠘⡄⠀⢠⠃⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⡆⡇⠀⠀⠀⠀⠀⠀⢱⠀⡸⠀⠀⠀⠀⠀⠀⡇⠀⢸⠀⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠸⠀⠀⠀⠀⠀⠀⠀⠘⡄⡇⠀⠀⠀⠀⠀⠀⢱⠀⡜⠀⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢷⠁⠀⠀⠀⠀⠀⠀⢸⠀⡇⠀⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠘⠀⠀⠀⠀⠀⠀⠀⠀⣧⠃⠀⠀⠀│ 
+   -50 │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢿⠀⠀⠀⠀│ 
+       └────────────────────────────────────────┘ 
+       1                                       10

test/fixtures/simple-lineplot-margin-17.txt

@@ -0,0 +1,18 @@
+                     ┌────────────────────────────────────────┐ 
+                  50 │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸│ 
+                     │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡄⠀⠀⠀⠀⠀⠀⠀⡸│ 
+                     │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸⢇⠀⠀⠀⠀⠀⠀⠀⡇│ 
+                     │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢠⢇⠀⠀⠀⠀⠀⠀⠀⡎⢸⠀⠀⠀⠀⠀⠀⢠⠃│ 
+                     │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡄⠀⠀⠀⠀⠀⠀⠀⡜⢸⠀⠀⠀⠀⠀⠀⢠⠃⠈⡆⠀⠀⠀⠀⠀⢸⠀│ 
+                     │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡸⠸⡀⠀⠀⠀⠀⠀⢠⠃⠀⡇⠀⠀⠀⠀⠀⢸⠀⠀⢇⠀⠀⠀⠀⠀⡎⠀│ 
+                     │⠀⠀⠀⡠⠳⡀⠀⠀⠀⠀⠀⢠⠃⠀⢣⠀⠀⠀⠀⠀⡜⠀⠀⢱⠀⠀⠀⠀⠀⡇⠀⠀⢸⠀⠀⠀⠀⠀⡇⠀│ 
+                     │⠤⢤⠼⠤⠤⠵⡤⠤⠤⠤⢤⠧⠤⠤⠼⡤⠤⠤⠤⢤⠧⠤⠤⠬⡦⠤⠤⠤⢴⠥⠤⠤⠬⡦⠤⠤⠤⢼⠤⠤│ 
+                     │⡠⠃⠀⠀⠀⠀⠱⡀⠀⠀⡜⠀⠀⠀⠀⢱⠀⠀⠀⡸⠀⠀⠀⠀⢣⠀⠀⠀⡸⠀⠀⠀⠀⡇⠀⠀⠀⡜⠀⠀│ 
+                     │⠁⠀⠀⠀⠀⠀⠀⠱⡀⡰⠁⠀⠀⠀⠀⠀⡇⠀⢀⠇⠀⠀⠀⠀⠸⡀⠀⠀⡇⠀⠀⠀⠀⢸⠀⠀⠀⡇⠀⠀│ 
+                     │⠀⠀⠀⠀⠀⠀⠀⠀⠱⠃⠀⠀⠀⠀⠀⠀⠸⡀⡸⠀⠀⠀⠀⠀⠀⢇⠀⢸⠀⠀⠀⠀⠀⠘⡄⠀⢰⠁⠀⠀│ 
+                     │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢇⠇⠀⠀⠀⠀⠀⠀⢸⠀⡎⠀⠀⠀⠀⠀⠀⡇⠀⢸⠀⠀⠀│ 
+                     │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⠀⠀⠀⠀⠀⠀⠀⠀⣇⠇⠀⠀⠀⠀⠀⠀⢸⠀⡇⠀⠀⠀│ 
+                     │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠹⠀⠀⠀⠀⠀⠀⠀⠘⣄⠇⠀⠀⠀│ 
+                 -50 │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣿⠀⠀⠀⠀│ 
+                     └────────────────────────────────────────┘ 
+                     1                                       10

test/fixtures/simple-lineplot-padding-17.txt

@@ -0,0 +1,18 @@
+                       ┌────────────────────────────────────────┐                 
+    50                 │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸│                 
+                       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡄⠀⠀⠀⠀⠀⠀⠀⡸│                 
+                       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸⢇⠀⠀⠀⠀⠀⠀⠀⡇│                 
+                       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢠⢇⠀⠀⠀⠀⠀⠀⠀⡎⢸⠀⠀⠀⠀⠀⠀⢠⠃│                 
+                       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡄⠀⠀⠀⠀⠀⠀⠀⡜⢸⠀⠀⠀⠀⠀⠀⢠⠃⠈⡆⠀⠀⠀⠀⠀⢸⠀│                 
+                       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡸⠸⡀⠀⠀⠀⠀⠀⢠⠃⠀⡇⠀⠀⠀⠀⠀⢸⠀⠀⢇⠀⠀⠀⠀⠀⡎⠀│                 
+                       │⠀⠀⠀⡠⠳⡀⠀⠀⠀⠀⠀⢠⠃⠀⢣⠀⠀⠀⠀⠀⡜⠀⠀⢱⠀⠀⠀⠀⠀⡇⠀⠀⢸⠀⠀⠀⠀⠀⡇⠀│                 
+                       │⠤⢤⠼⠤⠤⠵⡤⠤⠤⠤⢤⠧⠤⠤⠼⡤⠤⠤⠤⢤⠧⠤⠤⠬⡦⠤⠤⠤⢴⠥⠤⠤⠬⡦⠤⠤⠤⢼⠤⠤│                 
+                       │⡠⠃⠀⠀⠀⠀⠱⡀⠀⠀⡜⠀⠀⠀⠀⢱⠀⠀⠀⡸⠀⠀⠀⠀⢣⠀⠀⠀⡸⠀⠀⠀⠀⡇⠀⠀⠀⡜⠀⠀│                 
+                       │⠁⠀⠀⠀⠀⠀⠀⠱⡀⡰⠁⠀⠀⠀⠀⠀⡇⠀⢀⠇⠀⠀⠀⠀⠸⡀⠀⠀⡇⠀⠀⠀⠀⢸⠀⠀⠀⡇⠀⠀│                 
+                       │⠀⠀⠀⠀⠀⠀⠀⠀⠱⠃⠀⠀⠀⠀⠀⠀⠸⡀⡸⠀⠀⠀⠀⠀⠀⢇⠀⢸⠀⠀⠀⠀⠀⠘⡄⠀⢰⠁⠀⠀│                 
+                       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢇⠇⠀⠀⠀⠀⠀⠀⢸⠀⡎⠀⠀⠀⠀⠀⠀⡇⠀⢸⠀⠀⠀│                 
+                       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⠀⠀⠀⠀⠀⠀⠀⠀⣇⠇⠀⠀⠀⠀⠀⠀⢸⠀⡇⠀⠀⠀│                 
+                       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠹⠀⠀⠀⠀⠀⠀⠀⠘⣄⠇⠀⠀⠀│                 
+   -50                 │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣿⠀⠀⠀⠀│                 
+                       └────────────────────────────────────────┘                 
+                       1                                       10

test/fixtures/simple-lineplot-width-17.txt

@@ -0,0 +1,18 @@
+       ┌─────────────────┐ 
+    50 │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡄⠀⠀⢸│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡇⠀⠀⢸│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⣧⠀⠀⢸⢣⠀⠀⢸│ 
+       │⠀⠀⠀⠀⠀⢠⠀⠀⠀⣿⠀⠀⢸⢸⠀⠀⡇│ 
+       │⠀⠀⠀⠀⠀⣾⠀⠀⢰⢹⠀⠀⢸⢸⠀⠀⡇│ 
+       │⠀⡸⡄⠀⢀⠇⡇⠀⢸⠈⡆⠀⡎⢸⠀⠀⡇│ 
+       │⢤⠧⢧⠤⢼⠤⡧⠤⡼⠤⡧⠤⡧⠬⡦⠤⡧│ 
+       │⡎⠀⠸⡀⡎⠀⢸⠀⡇⠀⡇⠀⡇⠀⡇⢸⠀│ 
+       │⠁⠀⠀⡇⡇⠀⢸⠀⡇⠀⢸⢠⠃⠀⡇⢸⠀│ 
+       │⠀⠀⠀⠸⠀⠀⠀⣿⠀⠀⢸⢸⠀⠀⢇⢸⠀│ 
+       │⠀⠀⠀⠀⠀⠀⠀⣿⠀⠀⠸⣸⠀⠀⢸⢸⠀│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠈⠀⠀⠀⡟⠀⠀⢸⡇⠀│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠇⠀⠀⢸⡇⠀│ 
+   -50 │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⡇⠀│ 
+       └─────────────────┘ 
+       1                10

test/fixtures/simple-lineplot-xlabel.txt

@@ -0,0 +1,19 @@
+       ┌────────────────────────────────────────┐ 
+    50 │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡄⠀⠀⠀⠀⠀⠀⠀⡸│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸⢇⠀⠀⠀⠀⠀⠀⠀⡇│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢠⢇⠀⠀⠀⠀⠀⠀⠀⡎⢸⠀⠀⠀⠀⠀⠀⢠⠃│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡄⠀⠀⠀⠀⠀⠀⠀⡜⢸⠀⠀⠀⠀⠀⠀⢠⠃⠈⡆⠀⠀⠀⠀⠀⢸⠀│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡸⠸⡀⠀⠀⠀⠀⠀⢠⠃⠀⡇⠀⠀⠀⠀⠀⢸⠀⠀⢇⠀⠀⠀⠀⠀⡎⠀│ 
+       │⠀⠀⠀⡠⠳⡀⠀⠀⠀⠀⠀⢠⠃⠀⢣⠀⠀⠀⠀⠀⡜⠀⠀⢱⠀⠀⠀⠀⠀⡇⠀⠀⢸⠀⠀⠀⠀⠀⡇⠀│ 
+       │⠤⢤⠼⠤⠤⠵⡤⠤⠤⠤⢤⠧⠤⠤⠼⡤⠤⠤⠤⢤⠧⠤⠤⠬⡦⠤⠤⠤⢴⠥⠤⠤⠬⡦⠤⠤⠤⢼⠤⠤│ 
+       │⡠⠃⠀⠀⠀⠀⠱⡀⠀⠀⡜⠀⠀⠀⠀⢱⠀⠀⠀⡸⠀⠀⠀⠀⢣⠀⠀⠀⡸⠀⠀⠀⠀⡇⠀⠀⠀⡜⠀⠀│ 
+       │⠁⠀⠀⠀⠀⠀⠀⠱⡀⡰⠁⠀⠀⠀⠀⠀⡇⠀⢀⠇⠀⠀⠀⠀⠸⡀⠀⠀⡇⠀⠀⠀⠀⢸⠀⠀⠀⡇⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠱⠃⠀⠀⠀⠀⠀⠀⠸⡀⡸⠀⠀⠀⠀⠀⠀⢇⠀⢸⠀⠀⠀⠀⠀⠘⡄⠀⢰⠁⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢇⠇⠀⠀⠀⠀⠀⠀⢸⠀⡎⠀⠀⠀⠀⠀⠀⡇⠀⢸⠀⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⠀⠀⠀⠀⠀⠀⠀⠀⣇⠇⠀⠀⠀⠀⠀⠀⢸⠀⡇⠀⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠹⠀⠀⠀⠀⠀⠀⠀⠘⣄⠇⠀⠀⠀│ 
+   -50 │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣿⠀⠀⠀⠀│ 
+       └────────────────────────────────────────┘ 
+       1                                       10
+                        X-LABEL

test/fixtures/simple-lineplot-ylabel.txt

@@ -0,0 +1,18 @@
+               ┌────────────────────────────────────────┐ 
+            50 │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸│ 
+               │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡄⠀⠀⠀⠀⠀⠀⠀⡸│ 
+               │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸⢇⠀⠀⠀⠀⠀⠀⠀⡇│ 
+               │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢠⢇⠀⠀⠀⠀⠀⠀⠀⡎⢸⠀⠀⠀⠀⠀⠀⢠⠃│ 
+               │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡄⠀⠀⠀⠀⠀⠀⠀⡜⢸⠀⠀⠀⠀⠀⠀⢠⠃⠈⡆⠀⠀⠀⠀⠀⢸⠀│ 
+               │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡸⠸⡀⠀⠀⠀⠀⠀⢠⠃⠀⡇⠀⠀⠀⠀⠀⢸⠀⠀⢇⠀⠀⠀⠀⠀⡎⠀│ 
+               │⠀⠀⠀⡠⠳⡀⠀⠀⠀⠀⠀⢠⠃⠀⢣⠀⠀⠀⠀⠀⡜⠀⠀⢱⠀⠀⠀⠀⠀⡇⠀⠀⢸⠀⠀⠀⠀⠀⡇⠀│ 
+   Y-LABEL     │⠤⢤⠼⠤⠤⠵⡤⠤⠤⠤⢤⠧⠤⠤⠼⡤⠤⠤⠤⢤⠧⠤⠤⠬⡦⠤⠤⠤⢴⠥⠤⠤⠬⡦⠤⠤⠤⢼⠤⠤│ 
+               │⡠⠃⠀⠀⠀⠀⠱⡀⠀⠀⡜⠀⠀⠀⠀⢱⠀⠀⠀⡸⠀⠀⠀⠀⢣⠀⠀⠀⡸⠀⠀⠀⠀⡇⠀⠀⠀⡜⠀⠀│ 
+               │⠁⠀⠀⠀⠀⠀⠀⠱⡀⡰⠁⠀⠀⠀⠀⠀⡇⠀⢀⠇⠀⠀⠀⠀⠸⡀⠀⠀⡇⠀⠀⠀⠀⢸⠀⠀⠀⡇⠀⠀│ 
+               │⠀⠀⠀⠀⠀⠀⠀⠀⠱⠃⠀⠀⠀⠀⠀⠀⠸⡀⡸⠀⠀⠀⠀⠀⠀⢇⠀⢸⠀⠀⠀⠀⠀⠘⡄⠀⢰⠁⠀⠀│ 
+               │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢇⠇⠀⠀⠀⠀⠀⠀⢸⠀⡎⠀⠀⠀⠀⠀⠀⡇⠀⢸⠀⠀⠀│ 
+               │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⠀⠀⠀⠀⠀⠀⠀⠀⣇⠇⠀⠀⠀⠀⠀⠀⢸⠀⡇⠀⠀⠀│ 
+               │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠹⠀⠀⠀⠀⠀⠀⠀⠘⣄⠇⠀⠀⠀│ 
+           -50 │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣿⠀⠀⠀⠀│ 
+               └────────────────────────────────────────┘ 
+               1                                       10

test/fixtures/simple-lineplot.txt

@@ -0,0 +1,18 @@
+       ┌────────────────────────────────────────┐ 
+    50 │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡄⠀⠀⠀⠀⠀⠀⠀⡸│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸⢇⠀⠀⠀⠀⠀⠀⠀⡇│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢠⢇⠀⠀⠀⠀⠀⠀⠀⡎⢸⠀⠀⠀⠀⠀⠀⢠⠃│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡄⠀⠀⠀⠀⠀⠀⠀⡜⢸⠀⠀⠀⠀⠀⠀⢠⠃⠈⡆⠀⠀⠀⠀⠀⢸⠀│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡸⠸⡀⠀⠀⠀⠀⠀⢠⠃⠀⡇⠀⠀⠀⠀⠀⢸⠀⠀⢇⠀⠀⠀⠀⠀⡎⠀│ 
+       │⠀⠀⠀⡠⠳⡀⠀⠀⠀⠀⠀⢠⠃⠀⢣⠀⠀⠀⠀⠀⡜⠀⠀⢱⠀⠀⠀⠀⠀⡇⠀⠀⢸⠀⠀⠀⠀⠀⡇⠀│ 
+       │⠤⢤⠼⠤⠤⠵⡤⠤⠤⠤⢤⠧⠤⠤⠼⡤⠤⠤⠤⢤⠧⠤⠤⠬⡦⠤⠤⠤⢴⠥⠤⠤⠬⡦⠤⠤⠤⢼⠤⠤│ 
+       │⡠⠃⠀⠀⠀⠀⠱⡀⠀⠀⡜⠀⠀⠀⠀⢱⠀⠀⠀⡸⠀⠀⠀⠀⢣⠀⠀⠀⡸⠀⠀⠀⠀⡇⠀⠀⠀⡜⠀⠀│ 
+       │⠁⠀⠀⠀⠀⠀⠀⠱⡀⡰⠁⠀⠀⠀⠀⠀⡇⠀⢀⠇⠀⠀⠀⠀⠸⡀⠀⠀⡇⠀⠀⠀⠀⢸⠀⠀⠀⡇⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠱⠃⠀⠀⠀⠀⠀⠀⠸⡀⡸⠀⠀⠀⠀⠀⠀⢇⠀⢸⠀⠀⠀⠀⠀⠘⡄⠀⢰⠁⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢇⠇⠀⠀⠀⠀⠀⠀⢸⠀⡎⠀⠀⠀⠀⠀⠀⡇⠀⢸⠀⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⠀⠀⠀⠀⠀⠀⠀⠀⣇⠇⠀⠀⠀⠀⠀⠀⢸⠀⡇⠀⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠹⠀⠀⠀⠀⠀⠀⠀⠘⣄⠇⠀⠀⠀│ 
+   -50 │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣿⠀⠀⠀⠀│ 
+       └────────────────────────────────────────┘ 
+       1                                       10

test/fixtures/simple.tsv

@@ -0,0 +1,10 @@
+-10
+10
+-20
+20
+-30
+30
+-40
+40
+-50
+50

test/fixtures/simpleT.tsv

@@ -0,0 +1 @@
+-10	10	-20	20	-30	30	-40	40	-50	50

test/youplot/backends/processing_test.rb

@@ -8,4 +8,10 @@ class YouPlotCommandTest < Test::Unit::TestCase
     assert_equal([%i[a b c], [3, 2, 1]], @m.count_values(%i[a a a b b c]))
     assert_equal([%i[c b a], [3, 2, 1]], @m.count_values(%i[a b b c c c]))
   end
+
+  test :count_values_non_tally do
+    @m = YouPlot::Backends::Processing
+    assert_equal([%i[a b c], [3, 2, 1]], @m.count_values(%i[a a a b b c], tally: false))
+    assert_equal([%i[c b a], [3, 2, 1]], @m.count_values(%i[a b b c c c], tally: false))
+  end
 end

test/youplot/dsv_test.rb

@@ -2,9 +2,9 @@
 
 require_relative '../test_helper'
 
-class YouPlotDSVReaderTest < Test::Unit::TestCase
+class YouPlotDSVTest < Test::Unit::TestCase
   def setup
-    @m = YouPlot::DSVReader
+    @m = YouPlot::DSV
   end
 
   test :transpose2 do
@@ -59,6 +59,8 @@ class YouPlotDSVReaderTest < Test::Unit::TestCase
     assert_equal(nil, @m.get_headers([[1, 2, 3],
                                       [4, 5, 6],
                                       [7, 8, 9]], false, false))
+
+    assert_equal([1, 2, 3], @m.get_headers([[1, 2, 3]], true, false))
   end
 
   test :get_series do
@@ -123,5 +125,7 @@ class YouPlotDSVReaderTest < Test::Unit::TestCase
                   [n, n, 6]], @m.get_series([[1],
                                              [2, 4],
                                              [3, 5, 6]], false, false))
+
+    assert_equal([[], [], []], @m.get_series([[1, 2, 3]], true, false))
   end
 end

test/youplot/iris_test.rb

@@ -3,7 +3,7 @@
 require 'tempfile'
 require_relative '../test_helper'
 
-class YouPlotCommandTest < Test::Unit::TestCase
+class YouPlotIRISTest < Test::Unit::TestCase
   class << self
     def startup
       @stdin  = $stdin.dup
@@ -104,15 +104,26 @@ class YouPlotCommandTest < Test::Unit::TestCase
     assert_equal fixture('iris-boxplot.txt'), @stderr_file.read
   end
 
+  # test :c do
+  #   YouPlot::Command.new(['count', '-H', '-d,']).run
+  #   assert_equal fixture('iris-count.txt'), @stderr_file.read
+  # end
+
+  # test :count do
+  #   YouPlot::Command.new(['c', '-H', '-d,']).run
+  #   assert_equal fixture('iris-count.txt'), @stderr_file.read
+  # end
+
   test :plot_output_stdout do
     YouPlot::Command.new(['bar', '-o', '-H', '-d,', '-t', 'IRIS-BARPLOT']).run
     assert_equal '', @stderr_file.read
+    assert_equal fixture('iris-barplot.txt'), @stdout_file.read
   end
 
   test :data_output_stdout do
     YouPlot::Command.new(['bar', '-O', '-H', '-d,', '-t', 'IRIS-BARPLOT']).run
     assert_equal fixture('iris-barplot.txt'), @stderr_file.read
-    assert_equal File.read(File.expand_path('../fixtures/iris.csv', __dir__)), @stdout_file.read
+    assert_equal fixture('iris.csv'), @stdout_file.read
   end
 
   %i[colors color colours colour].each do |cmd_name|
@@ -128,4 +139,18 @@ class YouPlotCommandTest < Test::Unit::TestCase
     assert_equal '', @stderr_file.read
     assert_equal fixture('colors.txt'), @stdout_file.read
   end
+
+  test :unrecognized_command do
+    assert_raise(YouPlot::Command::Parser::Error) do
+      YouPlot::Command.new(['abracadabra', '--hadley', '--wickham']).run
+    end
+    assert_equal '', @stderr_file.read
+    assert_equal '', @stdout_file.read
+  end
+
+  test :encoding do
+    $stdin = File.open(File.expand_path('../fixtures/iris_utf16.csv', __dir__), 'r')
+    YouPlot::Command.new(['s', '--encoding', 'UTF-16', '-H', '-d,', '-t', 'IRIS-SCATTER']).run
+    assert_equal fixture('iris-scatter.txt'), @stderr_file.read
+  end
 end

test/youplot/simple_test.rb

@@ -0,0 +1,205 @@
+# frozen_string_literal: true
+
+require 'tempfile'
+require_relative '../test_helper'
+
+class YouPlotSimpleTest < Test::Unit::TestCase
+  class << self
+    def startup
+      @stdin  = $stdin.dup
+      @stdout = $stdout.dup
+      @stderr = $stderr.dup
+    end
+
+    def shutdown
+      $stdin  = @stdin
+      $stdout = @stdout
+      $stderr = @stderr
+    end
+  end
+
+  def setup
+    $stdin = File.open(File.expand_path('../fixtures/simple.tsv', __dir__), 'r')
+    @stderr_file = Tempfile.new
+    @stdout_file = Tempfile.new
+    $stderr = @stderr_file
+    $stdout = @stdout_file
+  end
+
+  def teardown
+    @stderr_file.close
+  end
+
+  def fixture(fname)
+    File.read(File.expand_path("../fixtures/#{fname}", __dir__))
+  end
+
+  test :bar do
+    assert_raise(ArgumentError) do
+      YouPlot::Command.new(['bar']).run
+    end
+  end
+
+  test :barplot do
+    assert_raise(ArgumentError) do
+      YouPlot::Command.new(['barplot']).run
+    end
+  end
+
+  test :hist do
+    YouPlot::Command.new(['hist']).run
+    assert_equal fixture('simple-histogram.txt'), @stderr_file.read
+  end
+
+  test :histogram do
+    YouPlot::Command.new(['histogram']).run
+    assert_equal fixture('simple-histogram.txt'), @stderr_file.read
+  end
+
+  test :line do
+    YouPlot::Command.new(['line']).run
+    assert_equal fixture('simple-lineplot.txt'), @stderr_file.read
+  end
+
+  test :lineplot do
+    YouPlot::Command.new(['lineplot']).run
+    assert_equal fixture('simple-lineplot.txt'), @stderr_file.read
+  end
+
+  test :lines do
+    assert_raise(YouPlot::Backends::UnicodePlotBackend::Error) do
+      YouPlot::Command.new(['lines']).run
+    end
+  end
+
+  test :lineplots do
+    assert_raise(YouPlot::Backends::UnicodePlotBackend::Error) do
+      YouPlot::Command.new(['lineplots']).run
+    end
+  end
+
+  test :s do
+    assert_raise(YouPlot::Backends::UnicodePlotBackend::Error) do
+      YouPlot::Command.new(['s']).run
+    end
+  end
+
+  test :scatter do
+    assert_raise(YouPlot::Backends::UnicodePlotBackend::Error) do
+      YouPlot::Command.new(['scatter']).run
+    end
+  end
+
+  test :d do
+    assert_raise(YouPlot::Backends::UnicodePlotBackend::Error) do
+      YouPlot::Command.new(['d']).run
+    end
+  end
+
+  test :density do
+    assert_raise(YouPlot::Backends::UnicodePlotBackend::Error) do
+      YouPlot::Command.new(['density']).run
+    end
+  end
+
+  test :box do
+    YouPlot::Command.new(['box']).run
+    assert_equal fixture('simple-boxplot.txt'), @stderr_file.read
+  end
+
+  test :boxplot do
+    YouPlot::Command.new(['boxplot']).run
+    assert_equal fixture('simple-boxplot.txt'), @stderr_file.read
+  end
+
+  # test :c do
+  #   omit
+  #   YouPlot::Command.new(['count', '-H', '-d,']).run
+  #   assert_equal fixture('iris-count.txt'), @stderr_file.read
+  # end
+
+  # test :count do
+  #   omit
+  #   YouPlot::Command.new(['c', '-H', '-d,']).run
+  #   assert_equal fixture('iris-count.txt'), @stderr_file.read
+  # end
+
+  test :plot_output_stdout do
+    YouPlot::Command.new(['line', '-o']).run
+    assert_equal '', @stderr_file.read
+    assert_equal fixture('simple-lineplot.txt'), @stdout_file.read
+  end
+
+  test :data_output_stdout do
+    YouPlot::Command.new(['box', '-O']).run
+    assert_equal fixture('simple-boxplot.txt'), @stderr_file.read
+    assert_equal fixture('simple.tsv'), @stdout_file.read
+  end
+
+  test :line_transpose do
+    $stdin = File.open(File.expand_path('../fixtures/simpleT.tsv', __dir__), 'r')
+    YouPlot::Command.new(['line', '--transpose']).run
+    assert_equal fixture('simple-lineplot.txt'), @stderr_file.read
+  end
+
+  test :line_T do
+    $stdin = File.open(File.expand_path('../fixtures/simpleT.tsv', __dir__), 'r')
+    YouPlot::Command.new(['line', '-T']).run
+    assert_equal fixture('simple-lineplot.txt'), @stderr_file.read
+  end
+
+  test :line_xlabel do
+    YouPlot::Command.new(['line', '--xlabel', 'X-LABEL']).run
+    assert_equal fixture('simple-lineplot-xlabel.txt'), @stderr_file.read
+  end
+
+  test :line_x do
+    YouPlot::Command.new(['line', '-x', 'X-LABEL']).run
+    assert_equal fixture('simple-lineplot-xlabel.txt'), @stderr_file.read
+  end
+
+  test :line_ylabel do
+    YouPlot::Command.new(['line', '--ylabel', 'Y-LABEL']).run
+    assert_equal fixture('simple-lineplot-ylabel.txt'), @stderr_file.read
+  end
+
+  test :line_y do
+    YouPlot::Command.new(['line', '-y', 'Y-LABEL']).run
+    assert_equal fixture('simple-lineplot-ylabel.txt'), @stderr_file.read
+  end
+
+  test :line_width do
+    YouPlot::Command.new(['line', '--width', '17']).run
+    assert_equal fixture('simple-lineplot-width-17.txt'), @stderr_file.read
+  end
+
+  test :line_w do
+    YouPlot::Command.new(['line', '--w', '17']).run
+    assert_equal fixture('simple-lineplot-width-17.txt'), @stderr_file.read
+  end
+
+  test :line_height do
+    YouPlot::Command.new(['line', '--height', '17']).run
+    assert_equal fixture('simple-lineplot-height-17.txt'), @stderr_file.read
+  end
+
+  test :line_h do
+    YouPlot::Command.new(['line', '--height', '17']).run
+    assert_equal fixture('simple-lineplot-height-17.txt'), @stderr_file.read
+  end
+
+  test :line_margin do
+    YouPlot::Command.new(['line', '--margin', '17']).run
+    assert_equal fixture('simple-lineplot-margin-17.txt'), @stderr_file.read
+  end
+
+  test :line_m do
+    YouPlot::Command.new(['line', '--m', '17']).run
+    assert_equal fixture('simple-lineplot-margin-17.txt'), @stderr_file.read
+  end
+
+  test :line_padding do
+    YouPlot::Command.new(['line', '--padding', '17']).run
+    assert_equal fixture('simple-lineplot-padding-17.txt'), @stderr_file.read
+  end
+end

test/youplot_test.rb

@@ -3,7 +3,19 @@
 require_relative 'test_helper'
 
 class YouPlotTest < Test::Unit::TestCase
-  def test_that_it_has_a_version_number
+  def teardown
+    YouPlot.run_as_executable = false
+  end
+
+  test :it_has_a_version_number do
     assert_kind_of String, ::YouPlot::VERSION
   end
+
+  test :run_as_executable do
+    assert_equal false, YouPlot.run_as_executable
+    assert_equal false, YouPlot.run_as_executable?
+    YouPlot.run_as_executable = true
+    assert_equal true, YouPlot.run_as_executable
+    assert_equal true, YouPlot.run_as_executable?
+  end
 end

youplot.gemspec

@@ -8,18 +8,15 @@ Gem::Specification.new do |spec|
   spec.authors       = ['kojix2']
   spec.email         = ['2xijok@gmail.com']
 
-  spec.summary       = 'Create Ascii charts on your terminal.'
+  spec.summary       = 'A command line tool for Unicode Plotting'
-  spec.description   = <<~MSG
+  spec.description   = 'A command line tool for Unicode Plotting'
-    Create ASCII charts on the terminal with data from standard streams in the 
-    pipeline. 
-  MSG
   spec.homepage      = 'https://github.com/kojix2/youplot'
   spec.license       = 'MIT'
   spec.required_ruby_version = Gem::Requirement.new('>= 2.4.0')
 
   spec.files         = Dir['*.{md,txt}', '{lib,exe}/**/*']
   spec.bindir        = 'exe'
-  spec.executables   = ['uplot', 'youplot']
+  spec.executables   = %w[uplot youplot]
   spec.require_paths = ['lib']
 
   spec.add_runtime_dependency 'unicode_plot'