v0.3.4

Add encoding test
-p option changes the meaning from padding to progress
2025-09-19 02:18:08 +08:00 · 2021-01-21 00:02:30 +09:00 · 2021-01-20 23:54:54 +09:00 · 2021-01-20 23:39:17 +09:00 · 2021-01-20 23:34:14 +09:00 · 2021-01-20 23:10:10 +09:00
37 changed files with 1384 additions and 519 deletions
--- a/.github/workflows/ci.yml
+++ b/.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
--- a/README.md
+++ b/README.md
@@ -1,11 +1,14 @@
-# YouPlot
+<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)
 [![Docs Latest](https://img.shields.io/badge/docs-latest-blue.svg)](https://rubydoc.info/gems/youplot)
 [![The MIT License](https://img.shields.io/badge/license-MIT-blue.svg)](LICENSE.txt)
+[![DOI](https://zenodo.org/badge/283230219.svg)](https://zenodo.org/badge/latestdoi/283230219)

-Create ASCII charts on the terminal with data from standard streams in the pipeline. 
+YouPlot is a command line tool for Unicode Plotting working with data from standard stream.

 :bar_chart: Powered by [UnicodePlot](https://github.com/red-data-tools/unicode_plot.rb)

@@ -15,16 +18,25 @@ Create ASCII charts on the terminal with data from standard streams in the pipel
 gem install youplot
 ```

-## Screenshots
+## Quick Start

-**histogram**
+* `cat data.tsv | uplot <command> [options]` or
+* `uplot <command> [options] <data.tsv>`
+
+### barplot

 ```sh
-ruby -r numo/narray -e "puts Numo::DFloat.new(1000).rand_norm.to_a" \
-  | uplot hist --nbins 15
+curl -sL https://git.io/ISLANDScsv \
+| sort -nk2 -t, \
+| tail -n15 \
+| uplot bar -d, -t "Areas of the World's Major Landmasses"
 ```

-<img src="https://i.imgur.com/wpsoGJq.png" width="75%" height="75%">
+<p align="center">
+<img alt="barplot" src="https://user-images.githubusercontent.com/5798442/101999903-d36a2d00-3d24-11eb-9361-b89116f44122.png">
+</p>
+
+### histogram

 ```sh
 echo -e "from numpy import random;" \
@@ -34,90 +46,151 @@ echo -e "from numpy import random;" \
 | uplot hist --nbins 20
 ```

-<img src="https://i.imgur.com/97R2MQx.png" width="75%" height="75%">
+<p align="center">
+  <img alt="histogram" src="https://user-images.githubusercontent.com/5798442/101999820-21cafc00-3d24-11eb-86db-e410d19b07df.png">
+</p>

-**scatter**
+### lineplot

 ```sh
-curl -s https://raw.githubusercontent.com/uiuc-cse/data-fa14/gh-pages/data/iris.csv \
-| cut -f1-4 -d, \
-| uplot scatter -H -d, -t IRIS
+curl -sL https://git.io/AirPassengers \
+| cut -f2,3 -d, \
+| uplot line -d, -w 50 -h 15 -t AirPassengers --xlim 1950,1960 --ylim 0,600
 ```

-<img src="https://i.imgur.com/STX7bFT.png" width="75%" height="75%">
+<p align="center">
+  <img alt="lineplot" src="https://user-images.githubusercontent.com/5798442/101999825-24c5ec80-3d24-11eb-99f4-c642e8d221bc.png">
+</p>

-**line**
+### scatter

 ```sh
-curl -s https://www.mhlw.go.jp/content/pcr_positive_daily.csv \
-| cut -f2 -d, \
-| uplot line -w 50 -h 15 -t 'PCR positive tests' --xlabel Date --ylabel number
+curl -sL https://git.io/IRIStsv \
+| cut -f1-4 \
+| uplot scatter -H -t IRIS
 ```

-<img src="https://i.imgur.com/PVl5dsa.png" width="75%" height="75%">
+<p align="center">
+  <img alt="scatter" src="https://user-images.githubusercontent.com/5798442/101999827-27284680-3d24-11eb-9903-551857eaa69c.png">
+</p>

-**box**
+### density

 ```sh
-curl -s https://raw.githubusercontent.com/uiuc-cse/data-fa14/gh-pages/data/iris.csv \
-| cut -f1-4 -d, \
-| uplot box -H -d, -t IRIS
+curl -sL https://git.io/IRIStsv \
+| cut -f1-4 \
+| uplot density -H -t IRIS
 ```

-<img src="https://i.imgur.com/sNI4SmN.png" width="75%" height="75%">
+<p align="center">
+  <img alt="density" src="https://user-images.githubusercontent.com/5798442/101999828-2abbcd80-3d24-11eb-902c-2f44266fa6ae.png">
+</p>

-**colors**
+### boxplot

 ```sh
-uplot colors
+curl -sL https://git.io/IRIStsv \
+| cut -f1-4 \
+| uplot boxplot -H -t IRIS
 ```

-<img src="https://i.imgur.com/LxyHQsz.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 it creates a bar chart. The human gene annotation file can be downloaded from the following website.
+
+* https://www.gencodegenes.org/human/
+
+```sh
+cat gencode.v35.annotation.gff3 \
+| grep -v '#' | grep 'gene' | cut -f1 | \
+ uplot count -t "The number of human gene annotations per chromosome"  -c blue
+```
+
+<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 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 \
+|sort | uniq -c | sort -nrk2 | awk '{print $2,$1}' \
+| uplot bar -d ' ' -t "The number of human gene annotations per chromosome"  -c blue
+```

 ## Usage

-`uplot --help`
+### Why YouPlot?

+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?
+
+`uplot` is the shortened form of `youplot`. You can use either.
+
+|                                   |                                                |
+|-----------------------------------|------------------------------------------------|
+| Reads data from standard input    | `cat data.tsv \| uplot <command> [options]`    |
+| Reads data from files             | `uplot <command> [options] data.tsv ...`       |
+| Outputs data from stdin to stdout | `pipeline1 \| uplot <command> -O \| pipeline2` |
+
+### Where to output the plot?
+
+By default, the plot is output to *standard error output*.
+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 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.
+
+| command   | short | how it works                           |
+|-----------|-------|----------------------------------------|
+| 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              |
+
+See Quick Start for `count`.
+
+| command   | short | how it works                                             |
+|-----------|-------|----------------------------------------------------------|
+| count     | c     |  draw a barplot based on the number of occurrences (slow) |
+
+### 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
 ```
-Program: YouPlot (Tools for plotting on the terminal)
-Version: 0.2.7 (using UnicodePlot 0.0.4)
-Source:  https://github.com/kojix2/youplot

-Usage:   uplot <command> [options] <in.tsv>
-
-Commands:
-    barplot    bar
-    histogram  hist
-    lineplot   line
-    lineplots  lines
-    scatter    s
-    density    d
-    boxplot    box
-    colors                   show the list of available colors
-
-    count      c             baplot based on the number of occurrences
-                             (slower than `sort | uniq -c | sort -n -k1`)
-
-Options:
-    -O, --pass [VAL]         file to output standard input data to [stdout]
-                             for inserting YouPlot in the middle of Unix pipes
-    -o, --output VAL         file to output results to [stderr]
-    -d, --delimiter VAL      use DELIM instead of TAB for field delimiter
-    -H, --headers            specify that the input has header row
-    -T, --transpose          transpose the axes of the input data
-    -t, --title VAL          print string on the top of plot
-    -x, --xlabel VAL         print string on the bottom of the plot
-    -y, --ylabel VAL         print string on the far left of the plot
-    -w, --width VAL          number of characters per row
-    -h, --height VAL         number of rows
-    -b, --border VAL         specify the style of the bounding box
-    -m, --margin VAL         number of spaces to the left of the plot
-    -p, --padding VAL        space of the left and right of the plot
-    -c, --color VAL          color of the drawing
-        --[no-]labels        hide the labels
-        --fmt VAL            xyxy : header is like x1, y1, x2, y2, x3, y3...
-                             xyy  : header is like x, y1, y2, y2, y3...
-```
+### How to view detailed command line options?

 Use `--help` to print command-specific options.

@@ -128,20 +201,43 @@ 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:
 ...
 ```

-## Development
+### How to view the list of available colors?

-Let's keep it simple.
+```sh
+uplot colors
+```

 ## Contributing

-Bug reports and pull requests are welcome on GitHub at [https://github.com/kojix2/youplot](https://github.com/kojix2/youplot).
+* [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
+
+
+### Development
+
+```sh
+git clone https://github.com/your_name/GR.rb # Clone the Git repo
+cd GR.rb
+bundle install             # Install the gem dependencies
+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

--- a/exe/uplot
+++ b/exe/uplot
@@ -3,4 +3,4 @@

 require 'youplot'

-YouPlot::Command.new.run
+YouPlot::Command.new.run_as_executable
--- a/exe/youplot
+++ b/exe/youplot
@@ -3,4 +3,4 @@

 require 'youplot'

-YouPlot::Command.new.run
+YouPlot::Command.new.run_as_executable
--- a/lib/youplot.rb
+++ b/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
--- a/lib/youplot/backends/processing.rb
+++ b/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
--- a/lib/youplot/backends/unicode_plot_backend.rb
+++ b/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.ylim = series.map(&:last).flatten.minmax  # why need?
-        x1, y1 = series.shift
+        params.xlim ||= series2.map(&:first).flatten.minmax # why need?
+        params.ylim ||= series2.map(&:last).flatten.minmax # why need?
+        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
@@ -152,17 +168,23 @@ module YouPlot
      end

      def colors(color_names = false)
+        # FIXME
+        s = String.new
        UnicodePlot::StyledPrinter::TEXT_COLORS.each do |k, v|
-          print v
-          print k
+          s << v
+          s << k.to_s
          unless color_names
-            print "\t"
-            print '  ●'
+            s << "\t"
+            s << '  ●'
          end
-          print "\033[0m"
-          print "\t"
+          s << "\033[0m"
+          s << "\t"
        end
-        puts
+        s << "\n"
+        def s.render(obj)
+          obj.print(self)
+        end
+        s
      end

      def check_series_size(data, fmt)
@@ -173,14 +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
--- a/lib/youplot/command.rb
+++ b/lib/youplot/command.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true

-require_relative 'dsv_reader'
+require_relative 'dsv'
 require_relative 'command/parser'

 # FIXME
@@ -10,88 +10,162 @@ module YouPlot
  Data = Struct.new(:headers, :series)

  class Command
-    attr_accessor :params
-    attr_reader :data, :fmt, :parser
+    attr_accessor :command, :params, :options
+    attr_reader :data, :parser

    def initialize(argv = ARGV)
      @argv    = argv
-      @params  = Params.new
      @parser  = Parser.new
+      @command = nil
+      @params  = nil
+      @options = nil
      @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
-      params    = parser.params
-      delimiter = parser.delimiter
-      transpose = parser.transpose
-      headers   = parser.headers
-      pass      = parser.pass
-      output    = parser.output
-      fmt       = parser.fmt
-      @encoding = parser.encoding
-      @debug    = parser.debug
+      @command ||= parser.command
+      @options ||= parser.options
+      @params  ||= parser.params

-      if command == :colors
-        @backend.colors(parser.color_names)
-        exit
+      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))
+          main(input)
+        end
      end
+    end

-      # Sometimes the input file does not end with a newline code.
-      while (input = Kernel.gets(nil))
+    private

-        # Pass the input to subsequent pipelines
-        case pass
-        when IO
-          pass.print(input)
-        else
-          if pass
-            File.open(pass, 'w') do |f|
-              f.print(input)
-            end
+    def main(input)
+      output_data(input)
+
+      @data = read_dsv(input)
+
+      pp @data if options[:debug]
+
+      plot = create_plot
+      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]
+      DSV.parse(input, options[:delimiter], options[:headers], options[:transpose])
+    end
+
+    def create_plot
+      case command
+      when :bar, :barplot
+        @backend.barplot(data, params, options[:fmt])
+      when :count, :c
+        @backend.barplot(data, params, count: true)
+      when :hist, :histogram
+        @backend.histogram(data, params)
+      when :line, :lineplot
+        @backend.line(data, params, options[:fmt])
+      when :lines, :lineplots
+        @backend.lines(data, params, options[:fmt])
+      when :scatter, :s
+        @backend.scatter(data, params, options[:fmt])
+      when :density, :d
+        @backend.density(data, params, options[:fmt])
+      when :box, :boxplot
+        @backend.boxplot(data, params)
+      when :colors, :color, :colours, :colour
+        @backend.colors(options[:color_names])
+      else
+        raise "unrecognized plot_type: #{command}"
+      end
+    end
+
+    def output_data(input)
+      # Pass the input to subsequent pipelines
+      case options[:pass]
+      when IO
+        options[:pass].print(input)
+      else
+        if options[:pass]
+          File.open(options[:pass], 'w') do |f|
+            f.print(input)
          end
        end
+      end
+    end

-        @data = if @encoding
-                  input2 = input.dup.force_encoding(@encoding).encode('utf-8')
-                  DSVReader.input(input2, delimiter, headers, transpose)
-                else
-                  DSVReader.input(input, delimiter, headers, transpose)
-                end
-
-        pp @data if @debug
-
-        plot = case command
-               when :bar, :barplot
-                 @backend.barplot(data, params, fmt)
-               when :count, :c
-                 @backend.barplot(data, params, count: true)
-               when :hist, :histogram
-                 @backend.histogram(data, params)
-               when :line, :lineplot
-                 @backend.line(data, params, fmt)
-               when :lines, :lineplots
-                 @backend.lines(data, params, fmt)
-               when :scatter, :s
-                 @backend.scatter(data, params, fmt)
-               when :density, :d
-                 @backend.density(data, params, fmt)
-               when :box, :boxplot
-                 @backend.boxplot(data, params)
-               else
-                 raise "unrecognized plot_type: #{command}"
-               end
-
-        case output
-        when IO
-          plot.render(output)
-        else
-          File.open(output, 'w') do |f|
-            plot.render(f)
-          end
+    def output_plot(plot)
+      case options[:output]
+      when IO
+        plot.render(options[:output])
+      else
+        File.open(options[:output], 'w') do |f|
+          plot.render(f)
        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
--- a/lib/youplot/command/options.rb
+++ b/lib/youplot/command/options.rb
@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+module YouPlot
+  class Command
+    Options = Struct.new(
+      :delimiter,
+      :transpose,
+      :headers,
+      :pass,
+      :progressive,
+      :output,
+      :fmt,
+      :encoding,
+      :color_names,
+      :debug,
+      keyword_init: true
+    )
+  end
+end
--- a/lib/youplot/command/parser.rb
+++ b/lib/youplot/command/parser.rb
@@ -1,275 +1,295 @@
 # frozen_string_literal: true

 require 'optparse'
-require_relative 'params'
+require_relative 'options'
+require_relative 'plot_params'

 module YouPlot
  class Command
    class Parser
-      attr_reader :command, :params,
-                  :delimiter, :transpose, :headers, :pass, :output, :fmt,
-                  :color_names, :encoding, :debug
+      class Error < StandardError; end
+
+      attr_reader :command, :options, :params,
+                  :main_parser, :sub_parser

      def initialize
-        @command     = nil
-        @params      = Params.new
+        @command = nil

-        @delimiter   = "\t"
-        @transpose   = false
-        @headers     = nil
-        @pass        = false
-        @output      = $stderr
-        @fmt         = 'xyy'
-        @encoding    = nil
-        @debug       = false
-        @color_names = false
+        @options = Options.new(
+          delimiter: "\t",
+          transpose: false,
+          headers: nil,
+          pass: false,
+          output: $stderr,
+          fmt: 'xyy',
+          encoding: nil,
+          color_names: false,
+          debug: false
+        )
+
+        @params = PlotParams.new
      end

      def create_default_parser
-        OptionParser.new do |opt|
-          opt.program_name  = 'YouPlot'
-          opt.version       = YouPlot::VERSION
-          opt.summary_width = 24
-          opt.on_tail('') # Add a blank line at the end
-          opt.separator('')
-          opt.on('Common options:')
-          opt.on('-O', '--pass [VAL]', 'file to output standard input data to [stdout]',
-                 'for inserting YouPlot in the middle of Unix pipes') do |v|
-            @pass = v || $stdout
+        OptionParser.new do |parser|
+          parser.program_name  = 'YouPlot'
+          parser.version       = YouPlot::VERSION
+          parser.summary_width = 24
+          parser.on_tail('') # Add a blank line at the end
+          parser.separator('')
+          parser.on('Common options:')
+          parser.on('-O', '--pass [FILE]', 'file to output input data to [stdout]',
+                    'for inserting YouPlot in the middle of Unix pipes') do |v|
+            options[:pass] = v || $stdout
          end
-          opt.on('-o', '--output VAL', 'file to output results to [stderr]') do |v|
-            @output = v
+          parser.on('-o', '--output [FILE]', 'file to output plots to [stdout]',
+                    'If no option is specified, plot will print to stderr') do |v|
+            options[:output] = v || $stdout
          end
-          opt.on('-d', '--delimiter VAL', String, 'use DELIM instead of TAB for field delimiter') do |v|
-            @delimiter = v
+          parser.on('-d', '--delimiter DELIM', String, 'use DELIM instead of [TAB] for field delimiter') do |v|
+            options[:delimiter] = v
          end
-          opt.on('-H', '--headers', TrueClass, 'specify that the input has header row') do |v|
-            @headers = v
+          parser.on('-H', '--headers', TrueClass, 'specify that the input has header row') do |v|
+            options[:headers] = v
          end
-          opt.on('-T', '--transpose', TrueClass, 'transpose the axes of the input data') do |v|
-            @transpose = v
+          parser.on('-T', '--transpose', TrueClass, 'transpose the axes of the input data') do |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('--encoding VAL', String, 'Specify the input encoding') do |v|
-            @encoding = v
+          parser.on('-p', '--progress', TrueClass, 'progressive mode [experimental]') do |v|
+            options[:progressive] = v
+          end
+          parser.on('--encoding STR', String, 'Specify the input encoding') do |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
-            puts opt.help
-            exit
+          parser.on('--help', 'print sub-command help menu') do
+            puts parser.help
+            exit if YouPlot.run_as_executable?
          end
-          opt.on('--debug', TrueClass, 'print preprocessed data') do |v|
-            @debug = v
+          parser.on('--debug', TrueClass, 'print preprocessed data') do |v|
+            options[:debug] = v
          end
-          yield opt if block_given?
+          # yield opt if block_given?
        end
      end

-      def main_parser
-        @main_parser ||= create_default_parser do |main_parser|
-          # Here, help message is stored in the banner.
-          # Because help of main_parser may be referred by `sub_parser`.
+      def create_main_parser
+        @main_parser = create_default_parser
+        main_parser.banner = \
+          <<~MSG

-          main_parser.banner = \
-            <<~MSG
+            Program: YouPlot (Tools for plotting on the terminal)
+            Version: #{YouPlot::VERSION} (using UnicodePlot #{UnicodePlot::VERSION})
+            Source:  https://github.com/kojix2/youplot

-              Program: YouPlot (Tools for plotting on the terminal)
-              Version: #{YouPlot::VERSION} (using UnicodePlot #{UnicodePlot::VERSION})
-              Source:  https://github.com/kojix2/youplot
+            Usage:   uplot <command> [options] <in.tsv>

-              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:
-                  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                   show the list of available colors
+                count      c             draw a baplot based on the number of
+                                         occurrences (slow)

-                  count      c             draw a baplot based on the number of 
-                                           occurrences (slow)
+            General options:
+                --help                   print command specific help menu
+                --version                print the version of YouPlot
+          MSG

-              General options:
-                  --help                   print command specific help menu
-                  --version                print the version of YouPlot 
-            MSG
-
-          # Actually, main_parser can take common optional arguments.
-          # 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
+        # Help for the main parser is simple.
+        # Simply show the banner above.
+        main_parser.on('--help', 'print sub-command help menu') do
+          puts main_parser.banner
+          puts
+          exit if YouPlot.run_as_executable?
        end
      end

-      def sub_parser
-        @sub_parser ||= create_default_parser do |parser|
-          parser.banner = <<~MSG
+      def sub_parser_add_symbol
+        sub_parser.on_head('--symbol STR', String, 'character to be used to plot the bars') do |v|
+          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.
-          when nil
-            warn main_parser.banner
-            warn "\n"
+        # If you type only `uplot` in the terminal.
+        when nil
+          warn main_parser.banner
+          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|
-              @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|
-              @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|
-              @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|
-              @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|
-              @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
-            parser.on_head('-n', '--names', 'show color names only', TrueClass) do |v|
-              @color_names = v
-            end
-
          else
-            warn "uplot: unrecognized command '#{command}'"
-            exit 1
+            raise Error, error_message
          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
--- a/lib/youplot/command/plot_params.rb
+++ b/lib/youplot/command/plot_params.rb
@@ -7,7 +7,7 @@ module YouPlot
    # * Here, I use Struct for 2 safety reason.
    # * The keys are static in Struct.
    # * Struct does not conflict with keyword arguments. Hash dose.
-    Params = Struct.new(
+    PlotParams = Struct.new(
      # Sort me!
      :title,
      :width,
--- a/lib/youplot/dsv_reader.rb
+++ b/lib/youplot/dsv_reader.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
-          arr.map { |row| row[1..-1] }
+      if headers
+        if arr.size > 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
-        transpose2(arr[1..-1])
+      elsif transpose
+        arr
      else
        transpose2(arr)
      end
--- a/lib/youplot/version.rb
+++ b/lib/youplot/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true

 module YouPlot
-  VERSION = '0.3.1'
+  VERSION = '0.3.4'
 end
--- a/test/fixtures/IRIStsv.tsv
+++ b/test/fixtures/IRIStsv.tsv
@@ -0,0 +1,151 @@
+sepal_length	sepal_width	petal_length	petal_width	species
+5.1	3.5	1.4	0.2	Iris-setosa
+4.9	3	1.4	0.2	Iris-setosa
+4.7	3.2	1.3	0.2	Iris-setosa
+4.6	3.1	1.5	0.2	Iris-setosa
+5	3.6	1.4	0.2	Iris-setosa
+5.4	3.9	1.7	0.4	Iris-setosa
+4.6	3.4	1.4	0.3	Iris-setosa
+5	3.4	1.5	0.2	Iris-setosa
+4.4	2.9	1.4	0.2	Iris-setosa
+4.9	3.1	1.5	0.1	Iris-setosa
+5.4	3.7	1.5	0.2	Iris-setosa
+4.8	3.4	1.6	0.2	Iris-setosa
+4.8	3	1.4	0.1	Iris-setosa
+4.3	3	1.1	0.1	Iris-setosa
+5.8	4	1.2	0.2	Iris-setosa
+5.7	4.4	1.5	0.4	Iris-setosa
+5.4	3.9	1.3	0.4	Iris-setosa
+5.1	3.5	1.4	0.3	Iris-setosa
+5.7	3.8	1.7	0.3	Iris-setosa
+5.1	3.8	1.5	0.3	Iris-setosa
+5.4	3.4	1.7	0.2	Iris-setosa
+5.1	3.7	1.5	0.4	Iris-setosa
+4.6	3.6	1	0.2	Iris-setosa
+5.1	3.3	1.7	0.5	Iris-setosa
+4.8	3.4	1.9	0.2	Iris-setosa
+5	3	1.6	0.2	Iris-setosa
+5	3.4	1.6	0.4	Iris-setosa
+5.2	3.5	1.5	0.2	Iris-setosa
+5.2	3.4	1.4	0.2	Iris-setosa
+4.7	3.2	1.6	0.2	Iris-setosa
+4.8	3.1	1.6	0.2	Iris-setosa
+5.4	3.4	1.5	0.4	Iris-setosa
+5.2	4.1	1.5	0.1	Iris-setosa
+5.5	4.2	1.4	0.2	Iris-setosa
+4.9	3.1	1.5	0.1	Iris-setosa
+5	3.2	1.2	0.2	Iris-setosa
+5.5	3.5	1.3	0.2	Iris-setosa
+4.9	3.1	1.5	0.1	Iris-setosa
+4.4	3	1.3	0.2	Iris-setosa
+5.1	3.4	1.5	0.2	Iris-setosa
+5	3.5	1.3	0.3	Iris-setosa
+4.5	2.3	1.3	0.3	Iris-setosa
+4.4	3.2	1.3	0.2	Iris-setosa
+5	3.5	1.6	0.6	Iris-setosa
+5.1	3.8	1.9	0.4	Iris-setosa
+4.8	3	1.4	0.3	Iris-setosa
+5.1	3.8	1.6	0.2	Iris-setosa
+4.6	3.2	1.4	0.2	Iris-setosa
+5.3	3.7	1.5	0.2	Iris-setosa
+5	3.3	1.4	0.2	Iris-setosa
+7	3.2	4.7	1.4	Iris-versicolor
+6.4	3.2	4.5	1.5	Iris-versicolor
+6.9	3.1	4.9	1.5	Iris-versicolor
+5.5	2.3	4	1.3	Iris-versicolor
+6.5	2.8	4.6	1.5	Iris-versicolor
+5.7	2.8	4.5	1.3	Iris-versicolor
+6.3	3.3	4.7	1.6	Iris-versicolor
+4.9	2.4	3.3	1	Iris-versicolor
+6.6	2.9	4.6	1.3	Iris-versicolor
+5.2	2.7	3.9	1.4	Iris-versicolor
+5	2	3.5	1	Iris-versicolor
+5.9	3	4.2	1.5	Iris-versicolor
+6	2.2	4	1	Iris-versicolor
+6.1	2.9	4.7	1.4	Iris-versicolor
+5.6	2.9	3.6	1.3	Iris-versicolor
+6.7	3.1	4.4	1.4	Iris-versicolor
+5.6	3	4.5	1.5	Iris-versicolor
+5.8	2.7	4.1	1	Iris-versicolor
+6.2	2.2	4.5	1.5	Iris-versicolor
+5.6	2.5	3.9	1.1	Iris-versicolor
+5.9	3.2	4.8	1.8	Iris-versicolor
+6.1	2.8	4	1.3	Iris-versicolor
+6.3	2.5	4.9	1.5	Iris-versicolor
+6.1	2.8	4.7	1.2	Iris-versicolor
+6.4	2.9	4.3	1.3	Iris-versicolor
+6.6	3	4.4	1.4	Iris-versicolor
+6.8	2.8	4.8	1.4	Iris-versicolor
+6.7	3	5	1.7	Iris-versicolor
+6	2.9	4.5	1.5	Iris-versicolor
+5.7	2.6	3.5	1	Iris-versicolor
+5.5	2.4	3.8	1.1	Iris-versicolor
+5.5	2.4	3.7	1	Iris-versicolor
+5.8	2.7	3.9	1.2	Iris-versicolor
+6	2.7	5.1	1.6	Iris-versicolor
+5.4	3	4.5	1.5	Iris-versicolor
+6	3.4	4.5	1.6	Iris-versicolor
+6.7	3.1	4.7	1.5	Iris-versicolor
+6.3	2.3	4.4	1.3	Iris-versicolor
+5.6	3	4.1	1.3	Iris-versicolor
+5.5	2.5	4	1.3	Iris-versicolor
+5.5	2.6	4.4	1.2	Iris-versicolor
+6.1	3	4.6	1.4	Iris-versicolor
+5.8	2.6	4	1.2	Iris-versicolor
+5	2.3	3.3	1	Iris-versicolor
+5.6	2.7	4.2	1.3	Iris-versicolor
+5.7	3	4.2	1.2	Iris-versicolor
+5.7	2.9	4.2	1.3	Iris-versicolor
+6.2	2.9	4.3	1.3	Iris-versicolor
+5.1	2.5	3	1.1	Iris-versicolor
+5.7	2.8	4.1	1.3	Iris-versicolor
+6.3	3.3	6	2.5	Iris-virginica
+5.8	2.7	5.1	1.9	Iris-virginica
+7.1	3	5.9	2.1	Iris-virginica
+6.3	2.9	5.6	1.8	Iris-virginica
+6.5	3	5.8	2.2	Iris-virginica
+7.6	3	6.6	2.1	Iris-virginica
+4.9	2.5	4.5	1.7	Iris-virginica
+7.3	2.9	6.3	1.8	Iris-virginica
+6.7	2.5	5.8	1.8	Iris-virginica
+7.2	3.6	6.1	2.5	Iris-virginica
+6.5	3.2	5.1	2	Iris-virginica
+6.4	2.7	5.3	1.9	Iris-virginica
+6.8	3	5.5	2.1	Iris-virginica
+5.7	2.5	5	2	Iris-virginica
+5.8	2.8	5.1	2.4	Iris-virginica
+6.4	3.2	5.3	2.3	Iris-virginica
+6.5	3	5.5	1.8	Iris-virginica
+7.7	3.8	6.7	2.2	Iris-virginica
+7.7	2.6	6.9	2.3	Iris-virginica
+6	2.2	5	1.5	Iris-virginica
+6.9	3.2	5.7	2.3	Iris-virginica
+5.6	2.8	4.9	2	Iris-virginica
+7.7	2.8	6.7	2	Iris-virginica
+6.3	2.7	4.9	1.8	Iris-virginica
+6.7	3.3	5.7	2.1	Iris-virginica
+7.2	3.2	6	1.8	Iris-virginica
+6.2	2.8	4.8	1.8	Iris-virginica
+6.1	3	4.9	1.8	Iris-virginica
+6.4	2.8	5.6	2.1	Iris-virginica
+7.2	3	5.8	1.6	Iris-virginica
+7.4	2.8	6.1	1.9	Iris-virginica
+7.9	3.8	6.4	2	Iris-virginica
+6.4	2.8	5.6	2.2	Iris-virginica
+6.3	2.8	5.1	1.5	Iris-virginica
+6.1	2.6	5.6	1.4	Iris-virginica
+7.7	3	6.1	2.3	Iris-virginica
+6.3	3.4	5.6	2.4	Iris-virginica
+6.4	3.1	5.5	1.8	Iris-virginica
+6	3	4.8	1.8	Iris-virginica
+6.9	3.1	5.4	2.1	Iris-virginica
+6.7	3.1	5.6	2.4	Iris-virginica
+6.9	3.1	5.1	2.3	Iris-virginica
+5.8	2.7	5.1	1.9	Iris-virginica
+6.8	3.2	5.9	2.3	Iris-virginica
+6.7	3.3	5.7	2.5	Iris-virginica
+6.7	3	5.2	2.3	Iris-virginica
+6.3	2.5	5	1.9	Iris-virginica
+6.5	3	5.2	2	Iris-virginica
+6.2	3.4	5.4	2.3	Iris-virginica
+5.9	3	5.1	1.8	Iris-virginica
--- a/test/fixtures/iris-count.txt
+++ b/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                                   
+       └                                        ┘ 
--- a/test/fixtures/iris-density.txt
+++ b/test/fixtures/iris-density.txt
@@ -1,20 +1,20 @@
                     IRIS-DENSITY
       ┌────────────────────────────────────────┐             
-   6.9 │                                        │ sepal_width 
+   6.9 │                                     ░  │ sepal_width 
       │                                        │ petal_length
-       │                                        │ petal_width 
-       │                                        │ species     
-       │                    ░                   │             
-       │                                        │             
+       │                          ░             │ petal_width 
+       │                ░      ░░               │ species     
+       │                   ░  ░                 │             
       │               ░                        │             
-       │          ░                             │             
-       │       ░            ░   ░░ ░            │             
-       │               ░  ░    ░                │             
+       │        ░   ░░  ░                       │             
+       │       ▒░             ░                 │             
+       │ ░   ░░       ░░ ░ ░   ░░ ░░░           │             
+       │             ░  ░     ░   ░             │             
+       │                       ░░   ░        ░  │             
+       │   ░ ░░░▒ ░ ░    ░░░  ░   ░             │             
+       │       ░     ░░░░                       │             
       │                                        │             
-       │       ░ ░▒ ░ ░     ░  ░                │             
-       │          ░    ░ ░                      │             
-       │                                        │             
-     0 │    ░░ ▒ ░█ ░ ░▒ ░░ ░  ░░░ ░            │             
+     0 │ ░ ▒░▒▒██ ▒ ▓▒░▒▒░░░ ░▒▒░ ▒░░   ░    ░  │             
       └────────────────────────────────────────┘             
-       4                                        8
+       4.3                                    7.9
                     sepal_length
--- a/test/fixtures/iris-lineplots.txt
+++ b/test/fixtures/iris-lineplots.txt
@@ -1,20 +1,20 @@
                    IRIS-LINEPLOTS
       ┌────────────────────────────────────────┐             
-   6.9 │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣀⣤⣲⠭⠃⠀⠀│ sepal_width 
-       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡀⠀⠀⠀⢀⣀⣠⣤⣶⣿⣿⣯⣴⣒⠖⠉⠁│ petal_length
-       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣤⢮⣤⣤⣶⣿⣿⣿⠿⠛⠛⠋⠉⠀⠀⠀⠀⠀⠀│ petal_width 
-       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣀⣤⣴⣷⣿⣿⣿⣿⣿⣿⣟⣟⡂⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│ species     
-       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣀⠤⠔⠒⢙⡻⠝⢋⡽⢝⣳⣾⣫⣥⣒⣪⣵⣖⣂⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀│             
-       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠉⠁⠀⠀⢀⣉⣟⣻⣿⣻⣿⣿⣿⠿⣿⣿⠿⠟⡢⠒⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│             
-       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣠⣤⣿⣷⣾⣿⡿⣿⡯⠿⠛⠋⠉⠀⣀⠔⠉⠀⠀⠀⠀⠀⠀⠀⠀⢀⣀⣄⣀⠄│             
-       │⠀⠀⠀⠀⢀⣨⣽⣿⣿⣿⣿⣿⣿⣿⣵⣚⣉⣃⣀⣠⣤⣤⣔⣮⣤⣄⣀⣠⣤⣔⣲⣾⡳⠮⠛⠋⢉⡗⠁⠀│             
-       │⠀⠀⠐⠒⡿⠿⠟⡻⠛⠛⠛⠚⠉⠀⠲⣶⣿⣷⣾⣷⣿⣿⣷⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣷⣶⣶⣷⡇⠀⠀│             
-       │⠀⠀⠀⠀⢱⡠⠊⠀⠀⣤⣤⣶⣿⣿⠿⣿⣿⣿⣿⣿⣟⣿⣿⣟⣟⣉⣉⣝⣛⣫⣭⣥⣤⣤⣔⣒⣒⡃⠀⠀│             
-       │⠀⠀⠀⠀⠀⠁⠀⢀⡀⠀⢯⠒⠉⡠⠔⠡⠤⠮⣤⣴⣿⣿⣿⣿⣿⣿⣿⣿⣿⣷⣿⣶⣶⣶⣶⣿⣿⠥⠤⠄│             
-       │⠀⠀⠀⠀⣀⣠⣄⣤⣭⣿⣿⣿⣿⣿⣿⣿⣿⣯⣯⣯⣭⣽⣿⣿⣿⣿⣿⣯⣭⣍⡙⠛⠝⠉⠀⠀⠀⠀⠀⠀│             
-       │⠀⠀⠠⠴⠿⢯⠭⠿⠯⣭⣷⡾⠿⠿⠿⣿⢿⡿⡻⠿⡟⠛⢛⣛⠯⠭⠒⠒⠉⠉⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│             
-       │⠀⠀⠀⠀⠀⠀⠀⠀⣀⣀⣄⠀⠀⠀⢀⣀⡠⠤⠔⠒⠊⠉⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│             
-     0 │⠀⠀⢀⣀⣴⣶⣾⣿⣿⣿⣿⣿⣿⣿⣿⣿⣻⣷⣄⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⡀│             
+   6.9 │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣀⣠⣴⡮⠟⠀⠀│ sepal_width 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡀⠀⠀⠀⠀⣀⣀⣤⣴⣶⣿⣟⣯⣥⣔⣲⠊⠉│ petal_length
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣔⢾⣥⣤⣶⣿⣿⣿⣿⠿⠛⠛⠋⠉⠀⠀⠀⠀⠀⠀│ petal_width 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣀⣠⣤⣾⣿⣿⣿⣿⣿⣿⣿⣿⣛⣗⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│ species     
+       │⠀⠀⠀⠀⠀⠀⠀⠀⣀⣀⠤⠔⠒⣋⡻⠭⠛⣩⡿⣟⣷⣽⣫⣥⣒⣲⣭⣶⣒⣀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│             
+       │⠀⠀⠀⠀⠀⠀⠈⠉⠀⠀⠀⢀⣉⡟⣛⣿⣝⣻⣿⣿⣿⠿⢿⣿⡿⠿⣛⠤⠊⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│             
+       │⠀⠀⠀⠀⠀⠀⠀⢀⣠⣤⣿⣷⣿⣿⣿⣿⣿⠿⠿⠛⠋⠉⠁⣀⠔⠊⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣀⣠⢀⣠│             
+       │⠀⢀⣀⣭⣿⣿⣿⣿⣿⣿⣿⣿⣽⣖⣋⣙⣀⣀⣤⣤⣤⣔⣮⣤⣄⣀⣀⣤⣤⣔⣶⣾⡳⠮⠝⠓⢊⢽⠋⠀│             
+       │⠒⢷⠿⠿⢛⠟⠛⠙⠑⠚⠉⠀⠲⣶⣿⣿⣶⣿⣷⣿⣿⣷⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣷⣶⣶⣷⣾⠀⠀│             
+       │⠀⠸⡠⠔⠁⠀⢠⡤⣴⣶⣿⣿⠿⣿⣿⣿⢿⣿⣿⣿⣿⣿⣟⣟⣉⣉⣩⣛⣛⣭⣭⣥⣤⣤⣔⣒⣒⡚⠀⠀│             
+       │⠀⠀⠁⠀⠀⢀⡀⠨⢞⠊⢉⡠⠔⠉⠤⠴⢥⣴⣾⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣶⣷⣶⣶⣶⣶⣿⣿⡭⠤⠤│             
+       │⠀⣀⣀⣄⣤⣤⣽⣿⣿⣿⣿⣿⣿⡿⣿⣿⣽⣽⣯⣭⣿⣿⣿⣿⣿⣿⣿⣭⣭⣉⠛⠛⠝⠉⠀⠀⠀⠀⠀⠀│             
+       │⠤⠿⠿⡯⠽⠿⢭⣽⣶⡾⠿⠿⠿⣿⠿⣿⢟⠿⢻⠟⠛⣛⣛⠯⠭⠝⠒⠊⠉⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│             
+       │⠀⠀⠀⠀⠀⢀⣀⡠⣀⠀⠀⠀⢀⣀⡠⠤⠤⠒⠒⠉⠉⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│             
+     0 │⣀⣴⣶⣾⣿⣷⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣦⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀│             
       └────────────────────────────────────────┘             
-       4                                        8
+       4.3                                    7.9
                     sepal_length
--- a/test/fixtures/iris-scatter.txt
+++ b/test/fixtures/iris-scatter.txt
@@ -1,20 +1,20 @@
                     IRIS-SCATTER
       ┌────────────────────────────────────────┐             
-   6.9 │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠄⠃⠀⠀│ sepal_width 
-       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡀⠀⠀⠀⠀⠀⠀⠀⠀⡄⠂⠄⠀⠀⠄⠀⠁│ petal_length
-       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⠀⠀⡀⡀⠂⠀⡆⠁⠄⠈⠀⠂⠀⠀⠀⠀⠀⠀⠀│ petal_width 
-       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡀⡀⡀⠀⠂⡀⠃⡅⠀⠄⠁⡂⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│ species     
-       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠐⠀⠁⠀⠄⢕⠀⠄⡃⠀⠀⠀⡁⠄⠂⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀│             
-       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠁⠀⠀⠀⠀⠁⣊⠀⡃⠀⡀⠉⠀⠅⠂⠅⠙⠀⠂⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│             
-       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢠⠀⢅⠀⡄⡮⠀⠅⠇⠀⠒⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠄⠀⠄│             
-       │⠀⠀⠀⠀⠀⠨⠀⠠⠀⡀⣷⠀⠆⠀⠄⠊⠀⠂⠀⠀⠄⠀⠄⡄⠀⠀⠀⡀⠀⠀⠀⠀⠁⠀⠀⠀⠀⠀⠀⠀│             
-       │⠀⠀⠐⠀⠇⠘⠀⠑⠀⠂⠓⠀⠀⠀⠂⢰⠀⡆⡀⠃⢶⠀⡄⡄⡇⡳⠀⠂⡃⠃⠑⠀⠃⠄⡀⠀⠂⡂⠀⠀│             
-       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⡄⠠⠀⠁⠀⠀⡮⠀⠆⡃⠀⠑⠀⠀⡅⠁⠀⠀⡄⠀⠀⠀⠀⠄⠀⠀⠀⠀⠂⠀⠀│             
-       │⠀⠀⠀⠀⠀⠁⠀⢀⠀⠀⢅⠀⠀⠀⠀⠡⠀⠄⡀⠀⠁⠀⠁⡁⡃⠅⠀⠃⠃⠃⠐⠀⠀⠀⡀⠀⠂⠅⠀⠄│             
-       │⠀⠀⠀⠀⡀⢠⠀⢤⠀⡆⣴⠀⡤⠀⠆⡠⠀⠆⠀⠅⢍⠀⠅⠅⠅⢅⠀⡇⡀⠄⡀⠀⠅⠁⠀⠀⠀⠀⠀⠀│             
-       │⠀⠀⠠⠀⠁⢁⠀⠁⠀⡀⡣⠀⠀⠀⠁⡯⠀⡃⡂⠀⡘⠀⠁⠁⠁⠈⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│             
-       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢄⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│             
-     0 │⠀⠀⢀⠀⡄⣲⠀⣴⠀⡄⣿⠀⣤⠀⡅⣄⠀⡃⡄⡀⣀⠀⡀⡀⡀⣀⠀⡀⡀⡀⣀⠀⡀⡀⡀⠀⡀⡀⠀⡀│             
+   6.9 │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠠⠘⠀⠀│ sepal_width 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡄⠂⠄⠀⠀⠠⠀⠈│ petal_length
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⠀⠀⡀⡀⠂⠀⢰⠈⠠⠀⠀⠁⠂⠀⠀⠀⠀⠀⠀⠀│ petal_width 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⢀⢀⠀⠀⠂⡀⠃⡅⠀⠠⠈⢐⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│ species     
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠂⠈⠀⠠⠨⢐⠀⠄⡃⠀⠀⠀⢈⠠⠐⢀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│             
+       │⠀⠀⠀⠀⠀⠀⠈⠀⠀⠀⠀⠀⠁⡂⡁⢘⠀⢀⠈⠈⠀⠅⠂⠅⠁⠘⠐⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│             
+       │⠀⠀⠀⠀⠀⠀⠀⠀⢠⠀⠅⡀⡄⡆⠅⠨⠸⠀⠐⠐⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠠⠀⠠│             
+       │⠀⠀⠀⠅⠀⠠⢀⢸⢰⠀⠆⠀⠄⠂⠁⠐⠀⠀⠠⠀⠀⠄⡄⠀⠀⠀⢀⠀⠀⠀⠀⠀⠁⠀⠀⠀⠀⠀⠀⠀│             
+       │⠂⠇⠀⠃⠁⠐⠐⠘⠐⠀⠀⠀⠂⠀⡆⢰⢀⠘⠰⢰⠀⡄⡄⡇⡃⠰⠐⢘⠘⠈⠀⠂⠃⠄⡀⠀⠐⢐⠀⠀│             
+       │⠀⠀⠀⠀⠀⠀⢠⠀⠠⠀⠁⠀⠀⡆⠅⠰⢘⠀⠈⠐⠀⠀⡅⠁⠀⠀⢠⠀⠀⠀⠀⠀⠄⠀⠀⠀⠀⠐⠀⠀│             
+       │⠀⠀⠁⠀⠀⢀⠀⠨⢀⠀⠀⠀⠀⠁⠄⠠⢀⠀⠈⠀⠀⠁⡁⡃⠅⠀⠘⠘⠘⠀⠀⠂⠀⠀⡀⠀⠐⠨⠀⠠│             
+       │⠀⡀⠀⡄⠄⢠⢰⢠⢰⠀⡄⠄⠆⡀⠄⠰⠀⠨⠨⢈⠀⠅⠅⠅⠅⢀⢸⢀⠠⢀⠀⠀⠅⠁⠀⠀⠀⠀⠀⠀│             
+       │⠄⠁⠁⡀⠁⠀⢀⢘⠠⠀⠀⠀⠁⡇⠅⢘⢐⠀⢀⠘⠀⠁⠁⠁⠀⠈⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│             
+       │⠀⠀⠀⠀⠀⠀⠀⠠⢀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│             
+     0 │⡀⡄⡂⡆⡄⢰⢠⢸⢸⠀⡄⡄⡅⡄⡀⢘⢠⢀⢀⢀⠀⡀⡀⡀⡀⢀⢀⢀⢀⢀⠀⡀⡀⡀⡀⠀⢀⢀⠀⢀│             
       └────────────────────────────────────────┘             
-       4                                        8
+       4.3                                    7.9
                     sepal_length
--- a/test/fixtures/iris_utf16.csv
+++ b/test/fixtures/iris_utf16.csv
--- a/test/fixtures/simple-boxplot.txt
+++ b/test/fixtures/simple-boxplot.txt
@@ -0,0 +1,6 @@
+     ┌                                        ┐ 
+      ╷       ┌──────────┬──────────┐        ╷  
+   1  ├───────┤          │          ├────────┤  
+      ╵       └──────────┴──────────┘        ╵  
+     └                                        ┘ 
+     -50                 0                   50
--- a/test/fixtures/simple-histogram.txt
+++ b/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
--- a/test/fixtures/simple-lineplot-height-17.txt
+++ b/test/fixtures/simple-lineplot-height-17.txt
@@ -0,0 +1,20 @@
+       ┌────────────────────────────────────────┐ 
+    50 │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡄⠀⠀⠀⠀⠀⠀⠀⢸│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸⡇⠀⠀⠀⠀⠀⠀⠀⡇│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡆⠀⠀⠀⠀⠀⠀⠀⡸⢸⠀⠀⠀⠀⠀⠀⠀⡇│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸⢸⠀⠀⠀⠀⠀⠀⠀⡇⠸⡀⠀⠀⠀⠀⠀⢸⠀│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢠⢣⠀⠀⠀⠀⠀⠀⠀⡇⠘⡄⠀⠀⠀⠀⠀⢰⠁⠀⡇⠀⠀⠀⠀⠀⡸⠀│ 
+       │⠀⠀⠀⠀⡀⠀⠀⠀⠀⠀⠀⠀⡎⠘⡄⠀⠀⠀⠀⠀⢰⠁⠀⢇⠀⠀⠀⠀⠀⡸⠀⠀⢣⠀⠀⠀⠀⠀⡇⠀│ 
+       │⠀⠀⢀⠜⠘⡄⠀⠀⠀⠀⠀⢸⠀⠀⢱⠀⠀⠀⠀⠀⡜⠀⠀⢸⠀⠀⠀⠀⠀⡇⠀⠀⢸⠀⠀⠀⠀⢀⠇⠀│ 
+       │⠤⢤⠮⠤⠤⠼⡤⠤⠤⠤⢤⠧⠤⠤⠬⡦⠤⠤⠤⢤⠧⠤⠤⠬⡦⠤⠤⠤⢴⠥⠤⠤⠬⡦⠤⠤⠤⢼⠤⠤│ 
+       │⡰⠁⠀⠀⠀⠀⠱⡀⠀⠀⡜⠀⠀⠀⠀⢱⠀⠀⠀⡸⠀⠀⠀⠀⢣⠀⠀⠀⡸⠀⠀⠀⠀⢇⠀⠀⠀⡸⠀⠀│ 
+       │⠁⠀⠀⠀⠀⠀⠀⢣⠀⢰⠁⠀⠀⠀⠀⠈⡆⠀⢀⠇⠀⠀⠀⠀⠸⡀⠀⠀⡇⠀⠀⠀⠀⢸⠀⠀⠀⡇⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⢣⠇⠀⠀⠀⠀⠀⠀⢱⠀⢸⠀⠀⠀⠀⠀⠀⡇⠀⢰⠁⠀⠀⠀⠀⠘⡄⠀⢠⠃⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⡆⡇⠀⠀⠀⠀⠀⠀⢱⠀⡸⠀⠀⠀⠀⠀⠀⡇⠀⢸⠀⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠸⠀⠀⠀⠀⠀⠀⠀⠘⡄⡇⠀⠀⠀⠀⠀⠀⢱⠀⡜⠀⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢷⠁⠀⠀⠀⠀⠀⠀⢸⠀⡇⠀⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠘⠀⠀⠀⠀⠀⠀⠀⠀⣧⠃⠀⠀⠀│ 
+   -50 │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢿⠀⠀⠀⠀│ 
+       └────────────────────────────────────────┘ 
+       1                                       10
--- a/test/fixtures/simple-lineplot-margin-17.txt
+++ b/test/fixtures/simple-lineplot-margin-17.txt
@@ -0,0 +1,18 @@
+                     ┌────────────────────────────────────────┐ 
+                  50 │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸│ 
+                     │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡄⠀⠀⠀⠀⠀⠀⠀⡸│ 
+                     │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸⢇⠀⠀⠀⠀⠀⠀⠀⡇│ 
+                     │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢠⢇⠀⠀⠀⠀⠀⠀⠀⡎⢸⠀⠀⠀⠀⠀⠀⢠⠃│ 
+                     │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡄⠀⠀⠀⠀⠀⠀⠀⡜⢸⠀⠀⠀⠀⠀⠀⢠⠃⠈⡆⠀⠀⠀⠀⠀⢸⠀│ 
+                     │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡸⠸⡀⠀⠀⠀⠀⠀⢠⠃⠀⡇⠀⠀⠀⠀⠀⢸⠀⠀⢇⠀⠀⠀⠀⠀⡎⠀│ 
+                     │⠀⠀⠀⡠⠳⡀⠀⠀⠀⠀⠀⢠⠃⠀⢣⠀⠀⠀⠀⠀⡜⠀⠀⢱⠀⠀⠀⠀⠀⡇⠀⠀⢸⠀⠀⠀⠀⠀⡇⠀│ 
+                     │⠤⢤⠼⠤⠤⠵⡤⠤⠤⠤⢤⠧⠤⠤⠼⡤⠤⠤⠤⢤⠧⠤⠤⠬⡦⠤⠤⠤⢴⠥⠤⠤⠬⡦⠤⠤⠤⢼⠤⠤│ 
+                     │⡠⠃⠀⠀⠀⠀⠱⡀⠀⠀⡜⠀⠀⠀⠀⢱⠀⠀⠀⡸⠀⠀⠀⠀⢣⠀⠀⠀⡸⠀⠀⠀⠀⡇⠀⠀⠀⡜⠀⠀│ 
+                     │⠁⠀⠀⠀⠀⠀⠀⠱⡀⡰⠁⠀⠀⠀⠀⠀⡇⠀⢀⠇⠀⠀⠀⠀⠸⡀⠀⠀⡇⠀⠀⠀⠀⢸⠀⠀⠀⡇⠀⠀│ 
+                     │⠀⠀⠀⠀⠀⠀⠀⠀⠱⠃⠀⠀⠀⠀⠀⠀⠸⡀⡸⠀⠀⠀⠀⠀⠀⢇⠀⢸⠀⠀⠀⠀⠀⠘⡄⠀⢰⠁⠀⠀│ 
+                     │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢇⠇⠀⠀⠀⠀⠀⠀⢸⠀⡎⠀⠀⠀⠀⠀⠀⡇⠀⢸⠀⠀⠀│ 
+                     │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⠀⠀⠀⠀⠀⠀⠀⠀⣇⠇⠀⠀⠀⠀⠀⠀⢸⠀⡇⠀⠀⠀│ 
+                     │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠹⠀⠀⠀⠀⠀⠀⠀⠘⣄⠇⠀⠀⠀│ 
+                 -50 │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣿⠀⠀⠀⠀│ 
+                     └────────────────────────────────────────┘ 
+                     1                                       10
--- a/test/fixtures/simple-lineplot-padding-17.txt
+++ b/test/fixtures/simple-lineplot-padding-17.txt
@@ -0,0 +1,18 @@
+                       ┌────────────────────────────────────────┐                 
+    50                 │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸│                 
+                       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡄⠀⠀⠀⠀⠀⠀⠀⡸│                 
+                       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸⢇⠀⠀⠀⠀⠀⠀⠀⡇│                 
+                       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢠⢇⠀⠀⠀⠀⠀⠀⠀⡎⢸⠀⠀⠀⠀⠀⠀⢠⠃│                 
+                       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡄⠀⠀⠀⠀⠀⠀⠀⡜⢸⠀⠀⠀⠀⠀⠀⢠⠃⠈⡆⠀⠀⠀⠀⠀⢸⠀│                 
+                       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡸⠸⡀⠀⠀⠀⠀⠀⢠⠃⠀⡇⠀⠀⠀⠀⠀⢸⠀⠀⢇⠀⠀⠀⠀⠀⡎⠀│                 
+                       │⠀⠀⠀⡠⠳⡀⠀⠀⠀⠀⠀⢠⠃⠀⢣⠀⠀⠀⠀⠀⡜⠀⠀⢱⠀⠀⠀⠀⠀⡇⠀⠀⢸⠀⠀⠀⠀⠀⡇⠀│                 
+                       │⠤⢤⠼⠤⠤⠵⡤⠤⠤⠤⢤⠧⠤⠤⠼⡤⠤⠤⠤⢤⠧⠤⠤⠬⡦⠤⠤⠤⢴⠥⠤⠤⠬⡦⠤⠤⠤⢼⠤⠤│                 
+                       │⡠⠃⠀⠀⠀⠀⠱⡀⠀⠀⡜⠀⠀⠀⠀⢱⠀⠀⠀⡸⠀⠀⠀⠀⢣⠀⠀⠀⡸⠀⠀⠀⠀⡇⠀⠀⠀⡜⠀⠀│                 
+                       │⠁⠀⠀⠀⠀⠀⠀⠱⡀⡰⠁⠀⠀⠀⠀⠀⡇⠀⢀⠇⠀⠀⠀⠀⠸⡀⠀⠀⡇⠀⠀⠀⠀⢸⠀⠀⠀⡇⠀⠀│                 
+                       │⠀⠀⠀⠀⠀⠀⠀⠀⠱⠃⠀⠀⠀⠀⠀⠀⠸⡀⡸⠀⠀⠀⠀⠀⠀⢇⠀⢸⠀⠀⠀⠀⠀⠘⡄⠀⢰⠁⠀⠀│                 
+                       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢇⠇⠀⠀⠀⠀⠀⠀⢸⠀⡎⠀⠀⠀⠀⠀⠀⡇⠀⢸⠀⠀⠀│                 
+                       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⠀⠀⠀⠀⠀⠀⠀⠀⣇⠇⠀⠀⠀⠀⠀⠀⢸⠀⡇⠀⠀⠀│                 
+                       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠹⠀⠀⠀⠀⠀⠀⠀⠘⣄⠇⠀⠀⠀│                 
+   -50                 │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣿⠀⠀⠀⠀│                 
+                       └────────────────────────────────────────┘                 
+                       1                                       10
--- a/test/fixtures/simple-lineplot-width-17.txt
+++ b/test/fixtures/simple-lineplot-width-17.txt
@@ -0,0 +1,18 @@
+       ┌─────────────────┐ 
+    50 │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡄⠀⠀⢸│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡇⠀⠀⢸│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⣧⠀⠀⢸⢣⠀⠀⢸│ 
+       │⠀⠀⠀⠀⠀⢠⠀⠀⠀⣿⠀⠀⢸⢸⠀⠀⡇│ 
+       │⠀⠀⠀⠀⠀⣾⠀⠀⢰⢹⠀⠀⢸⢸⠀⠀⡇│ 
+       │⠀⡸⡄⠀⢀⠇⡇⠀⢸⠈⡆⠀⡎⢸⠀⠀⡇│ 
+       │⢤⠧⢧⠤⢼⠤⡧⠤⡼⠤⡧⠤⡧⠬⡦⠤⡧│ 
+       │⡎⠀⠸⡀⡎⠀⢸⠀⡇⠀⡇⠀⡇⠀⡇⢸⠀│ 
+       │⠁⠀⠀⡇⡇⠀⢸⠀⡇⠀⢸⢠⠃⠀⡇⢸⠀│ 
+       │⠀⠀⠀⠸⠀⠀⠀⣿⠀⠀⢸⢸⠀⠀⢇⢸⠀│ 
+       │⠀⠀⠀⠀⠀⠀⠀⣿⠀⠀⠸⣸⠀⠀⢸⢸⠀│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠈⠀⠀⠀⡟⠀⠀⢸⡇⠀│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠇⠀⠀⢸⡇⠀│ 
+   -50 │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⡇⠀│ 
+       └─────────────────┘ 
+       1                10
--- a/test/fixtures/simple-lineplot-xlabel.txt
+++ b/test/fixtures/simple-lineplot-xlabel.txt
@@ -0,0 +1,19 @@
+       ┌────────────────────────────────────────┐ 
+    50 │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡄⠀⠀⠀⠀⠀⠀⠀⡸│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸⢇⠀⠀⠀⠀⠀⠀⠀⡇│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢠⢇⠀⠀⠀⠀⠀⠀⠀⡎⢸⠀⠀⠀⠀⠀⠀⢠⠃│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡄⠀⠀⠀⠀⠀⠀⠀⡜⢸⠀⠀⠀⠀⠀⠀⢠⠃⠈⡆⠀⠀⠀⠀⠀⢸⠀│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡸⠸⡀⠀⠀⠀⠀⠀⢠⠃⠀⡇⠀⠀⠀⠀⠀⢸⠀⠀⢇⠀⠀⠀⠀⠀⡎⠀│ 
+       │⠀⠀⠀⡠⠳⡀⠀⠀⠀⠀⠀⢠⠃⠀⢣⠀⠀⠀⠀⠀⡜⠀⠀⢱⠀⠀⠀⠀⠀⡇⠀⠀⢸⠀⠀⠀⠀⠀⡇⠀│ 
+       │⠤⢤⠼⠤⠤⠵⡤⠤⠤⠤⢤⠧⠤⠤⠼⡤⠤⠤⠤⢤⠧⠤⠤⠬⡦⠤⠤⠤⢴⠥⠤⠤⠬⡦⠤⠤⠤⢼⠤⠤│ 
+       │⡠⠃⠀⠀⠀⠀⠱⡀⠀⠀⡜⠀⠀⠀⠀⢱⠀⠀⠀⡸⠀⠀⠀⠀⢣⠀⠀⠀⡸⠀⠀⠀⠀⡇⠀⠀⠀⡜⠀⠀│ 
+       │⠁⠀⠀⠀⠀⠀⠀⠱⡀⡰⠁⠀⠀⠀⠀⠀⡇⠀⢀⠇⠀⠀⠀⠀⠸⡀⠀⠀⡇⠀⠀⠀⠀⢸⠀⠀⠀⡇⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠱⠃⠀⠀⠀⠀⠀⠀⠸⡀⡸⠀⠀⠀⠀⠀⠀⢇⠀⢸⠀⠀⠀⠀⠀⠘⡄⠀⢰⠁⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢇⠇⠀⠀⠀⠀⠀⠀⢸⠀⡎⠀⠀⠀⠀⠀⠀⡇⠀⢸⠀⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⠀⠀⠀⠀⠀⠀⠀⠀⣇⠇⠀⠀⠀⠀⠀⠀⢸⠀⡇⠀⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠹⠀⠀⠀⠀⠀⠀⠀⠘⣄⠇⠀⠀⠀│ 
+   -50 │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣿⠀⠀⠀⠀│ 
+       └────────────────────────────────────────┘ 
+       1                                       10
+                        X-LABEL
--- a/test/fixtures/simple-lineplot-ylabel.txt
+++ b/test/fixtures/simple-lineplot-ylabel.txt
@@ -0,0 +1,18 @@
+               ┌────────────────────────────────────────┐ 
+            50 │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸│ 
+               │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡄⠀⠀⠀⠀⠀⠀⠀⡸│ 
+               │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸⢇⠀⠀⠀⠀⠀⠀⠀⡇│ 
+               │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢠⢇⠀⠀⠀⠀⠀⠀⠀⡎⢸⠀⠀⠀⠀⠀⠀⢠⠃│ 
+               │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡄⠀⠀⠀⠀⠀⠀⠀⡜⢸⠀⠀⠀⠀⠀⠀⢠⠃⠈⡆⠀⠀⠀⠀⠀⢸⠀│ 
+               │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡸⠸⡀⠀⠀⠀⠀⠀⢠⠃⠀⡇⠀⠀⠀⠀⠀⢸⠀⠀⢇⠀⠀⠀⠀⠀⡎⠀│ 
+               │⠀⠀⠀⡠⠳⡀⠀⠀⠀⠀⠀⢠⠃⠀⢣⠀⠀⠀⠀⠀⡜⠀⠀⢱⠀⠀⠀⠀⠀⡇⠀⠀⢸⠀⠀⠀⠀⠀⡇⠀│ 
+   Y-LABEL     │⠤⢤⠼⠤⠤⠵⡤⠤⠤⠤⢤⠧⠤⠤⠼⡤⠤⠤⠤⢤⠧⠤⠤⠬⡦⠤⠤⠤⢴⠥⠤⠤⠬⡦⠤⠤⠤⢼⠤⠤│ 
+               │⡠⠃⠀⠀⠀⠀⠱⡀⠀⠀⡜⠀⠀⠀⠀⢱⠀⠀⠀⡸⠀⠀⠀⠀⢣⠀⠀⠀⡸⠀⠀⠀⠀⡇⠀⠀⠀⡜⠀⠀│ 
+               │⠁⠀⠀⠀⠀⠀⠀⠱⡀⡰⠁⠀⠀⠀⠀⠀⡇⠀⢀⠇⠀⠀⠀⠀⠸⡀⠀⠀⡇⠀⠀⠀⠀⢸⠀⠀⠀⡇⠀⠀│ 
+               │⠀⠀⠀⠀⠀⠀⠀⠀⠱⠃⠀⠀⠀⠀⠀⠀⠸⡀⡸⠀⠀⠀⠀⠀⠀⢇⠀⢸⠀⠀⠀⠀⠀⠘⡄⠀⢰⠁⠀⠀│ 
+               │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢇⠇⠀⠀⠀⠀⠀⠀⢸⠀⡎⠀⠀⠀⠀⠀⠀⡇⠀⢸⠀⠀⠀│ 
+               │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⠀⠀⠀⠀⠀⠀⠀⠀⣇⠇⠀⠀⠀⠀⠀⠀⢸⠀⡇⠀⠀⠀│ 
+               │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠹⠀⠀⠀⠀⠀⠀⠀⠘⣄⠇⠀⠀⠀│ 
+           -50 │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣿⠀⠀⠀⠀│ 
+               └────────────────────────────────────────┘ 
+               1                                       10
--- a/test/fixtures/simple-lineplot.txt
+++ b/test/fixtures/simple-lineplot.txt
@@ -0,0 +1,18 @@
+       ┌────────────────────────────────────────┐ 
+    50 │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡄⠀⠀⠀⠀⠀⠀⠀⡸│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸⢇⠀⠀⠀⠀⠀⠀⠀⡇│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢠⢇⠀⠀⠀⠀⠀⠀⠀⡎⢸⠀⠀⠀⠀⠀⠀⢠⠃│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡄⠀⠀⠀⠀⠀⠀⠀⡜⢸⠀⠀⠀⠀⠀⠀⢠⠃⠈⡆⠀⠀⠀⠀⠀⢸⠀│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡸⠸⡀⠀⠀⠀⠀⠀⢠⠃⠀⡇⠀⠀⠀⠀⠀⢸⠀⠀⢇⠀⠀⠀⠀⠀⡎⠀│ 
+       │⠀⠀⠀⡠⠳⡀⠀⠀⠀⠀⠀⢠⠃⠀⢣⠀⠀⠀⠀⠀⡜⠀⠀⢱⠀⠀⠀⠀⠀⡇⠀⠀⢸⠀⠀⠀⠀⠀⡇⠀│ 
+       │⠤⢤⠼⠤⠤⠵⡤⠤⠤⠤⢤⠧⠤⠤⠼⡤⠤⠤⠤⢤⠧⠤⠤⠬⡦⠤⠤⠤⢴⠥⠤⠤⠬⡦⠤⠤⠤⢼⠤⠤│ 
+       │⡠⠃⠀⠀⠀⠀⠱⡀⠀⠀⡜⠀⠀⠀⠀⢱⠀⠀⠀⡸⠀⠀⠀⠀⢣⠀⠀⠀⡸⠀⠀⠀⠀⡇⠀⠀⠀⡜⠀⠀│ 
+       │⠁⠀⠀⠀⠀⠀⠀⠱⡀⡰⠁⠀⠀⠀⠀⠀⡇⠀⢀⠇⠀⠀⠀⠀⠸⡀⠀⠀⡇⠀⠀⠀⠀⢸⠀⠀⠀⡇⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠱⠃⠀⠀⠀⠀⠀⠀⠸⡀⡸⠀⠀⠀⠀⠀⠀⢇⠀⢸⠀⠀⠀⠀⠀⠘⡄⠀⢰⠁⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢇⠇⠀⠀⠀⠀⠀⠀⢸⠀⡎⠀⠀⠀⠀⠀⠀⡇⠀⢸⠀⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⠀⠀⠀⠀⠀⠀⠀⠀⣇⠇⠀⠀⠀⠀⠀⠀⢸⠀⡇⠀⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠹⠀⠀⠀⠀⠀⠀⠀⠘⣄⠇⠀⠀⠀│ 
+   -50 │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣿⠀⠀⠀⠀│ 
+       └────────────────────────────────────────┘ 
+       1                                       10
--- a/test/fixtures/simple.tsv
+++ b/test/fixtures/simple.tsv
@@ -0,0 +1,10 @@
+-10
+10
+-20
+20
+-30
+30
+-40
+40
+-50
+50
--- a/test/fixtures/simpleT.tsv
+++ b/test/fixtures/simpleT.tsv
@@ -0,0 +1 @@
+-10	10	-20	20	-30	30	-40	40	-50	50
--- a/test/youplot/backends/processing_test.rb
+++ b/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
--- a/test/youplot/command_test.rb
+++ b/test/youplot/command_test.rb
@@ -1,102 +0,0 @@
-# frozen_string_literal: true
-
-require 'tempfile'
-require_relative '../test_helper'
-
-class YouPlotCommandTest < Test::Unit::TestCase
-  class << self
-    def startup
-      @stdin  = $stdin.dup
-      @stderr = $stderr.dup
-    end
-
-    def shutdown
-      $stdin  = @stdin
-      $stderr = @stderr
-    end
-  end
-
-  def setup
-    $stdin = File.open(File.expand_path('../fixtures/iris.csv', __dir__), 'r')
-    @tmp_file = Tempfile.new
-    $stderr = @tmp_file
-  end
-
-  def teardown
-    @tmp_file.close
-  end
-
-  def fixture(fname)
-    File.read(File.expand_path("../fixtures/#{fname}", __dir__))
-  end
-
-  test :bar do
-    YouPlot::Command.new(['bar', '-H', '-d,', '-t', 'IRIS-BARPLOT']).run
-    assert_equal fixture('iris-barplot.txt'), @tmp_file.read
-  end
-
-  test :barplot do
-    YouPlot::Command.new(['barplot', '-H', '-d,', '-t', 'IRIS-BARPLOT']).run
-    assert_equal fixture('iris-barplot.txt'), @tmp_file.read
-  end
-
-  test :hist do
-    YouPlot::Command.new(['hist', '-H', '-d,', '-t', 'IRIS-HISTOGRAM']).run
-    assert_equal fixture('iris-histogram.txt'), @tmp_file.read
-  end
-
-  test :histogram do
-    YouPlot::Command.new(['histogram', '-H', '-d,', '-t', 'IRIS-HISTOGRAM']).run
-    assert_equal fixture('iris-histogram.txt'), @tmp_file.read
-  end
-
-  test :line do
-    YouPlot::Command.new(['line', '-H', '-d,', '-t', 'IRIS-LINEPLOT']).run
-    assert_equal fixture('iris-lineplot.txt'), @tmp_file.read
-  end
-
-  test :lineplot do
-    YouPlot::Command.new(['lineplot', '-H', '-d,', '-t', 'IRIS-LINEPLOT']).run
-    assert_equal fixture('iris-lineplot.txt'), @tmp_file.read
-  end
-
-  test :lines do
-    YouPlot::Command.new(['lines', '-H', '-d,', '-t', 'IRIS-LINEPLOTS']).run
-    assert_equal fixture('iris-lineplots.txt'), @tmp_file.read
-  end
-
-  test :lineplots do
-    YouPlot::Command.new(['lineplots', '-H', '-d,', '-t', 'IRIS-LINEPLOTS']).run
-    assert_equal fixture('iris-lineplots.txt'), @tmp_file.read
-  end
-
-  test :s do
-    YouPlot::Command.new(['s', '-H', '-d,', '-t', 'IRIS-SCATTER']).run
-    assert_equal fixture('iris-scatter.txt'), @tmp_file.read
-  end
-
-  test :scatter do
-    YouPlot::Command.new(['scatter', '-H', '-d,', '-t', 'IRIS-SCATTER']).run
-    assert_equal fixture('iris-scatter.txt'), @tmp_file.read
-  end
-
-  test :d do
-    YouPlot::Command.new(['d', '-H', '-d,', '-t', 'IRIS-DENSITY']).run
-    assert_equal fixture('iris-density.txt'), @tmp_file.read
-  end
-
-  test :density do
-    YouPlot::Command.new(['density', '-H', '-d,', '-t', 'IRIS-DENSITY']).run
-    assert_equal fixture('iris-density.txt'), @tmp_file.read
-  end
-
-  test :box do
-    YouPlot::Command.new(['box', '-H', '-d,', '-t', 'IRIS-BOXPLOT']).run
-    assert_equal fixture('iris-boxplot.txt'), @tmp_file.read
-  end
-
-  test :boxplot do
-    YouPlot::Command.new(['boxplot', '-H', '-d,', '-t', 'IRIS-BOXPLOT']).run
-    assert_equal fixture('iris-boxplot.txt'), @tmp_file.read
-  end
-end
--- a/test/youplot/dev_reader_test.rb
+++ b/test/youplot/dev_reader_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
--- a/test/youplot/iris_test.rb
+++ b/test/youplot/iris_test.rb
@@ -0,0 +1,156 @@
+# frozen_string_literal: true
+
+require 'tempfile'
+require_relative '../test_helper'
+
+class YouPlotIRISTest < 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/iris.csv', __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
+    YouPlot::Command.new(['bar', '-H', '-d,', '-t', 'IRIS-BARPLOT']).run
+    assert_equal fixture('iris-barplot.txt'), @stderr_file.read
+  end
+
+  test :barplot do
+    YouPlot::Command.new(['barplot', '-H', '-d,', '-t', 'IRIS-BARPLOT']).run
+    assert_equal fixture('iris-barplot.txt'), @stderr_file.read
+  end
+
+  test :hist do
+    YouPlot::Command.new(['hist', '-H', '-d,', '-t', 'IRIS-HISTOGRAM']).run
+    assert_equal fixture('iris-histogram.txt'), @stderr_file.read
+  end
+
+  test :histogram do
+    YouPlot::Command.new(['histogram', '-H', '-d,', '-t', 'IRIS-HISTOGRAM']).run
+    assert_equal fixture('iris-histogram.txt'), @stderr_file.read
+  end
+
+  test :line do
+    YouPlot::Command.new(['line', '-H', '-d,', '-t', 'IRIS-LINEPLOT']).run
+    assert_equal fixture('iris-lineplot.txt'), @stderr_file.read
+  end
+
+  test :lineplot do
+    YouPlot::Command.new(['lineplot', '-H', '-d,', '-t', 'IRIS-LINEPLOT']).run
+    assert_equal fixture('iris-lineplot.txt'), @stderr_file.read
+  end
+
+  test :lines do
+    YouPlot::Command.new(['lines', '-H', '-d,', '-t', 'IRIS-LINEPLOTS']).run
+    assert_equal fixture('iris-lineplots.txt'), @stderr_file.read
+  end
+
+  test :lineplots do
+    YouPlot::Command.new(['lineplots', '-H', '-d,', '-t', 'IRIS-LINEPLOTS']).run
+    assert_equal fixture('iris-lineplots.txt'), @stderr_file.read
+  end
+
+  test :s do
+    YouPlot::Command.new(['s', '-H', '-d,', '-t', 'IRIS-SCATTER']).run
+    assert_equal fixture('iris-scatter.txt'), @stderr_file.read
+  end
+
+  test :scatter do
+    YouPlot::Command.new(['scatter', '-H', '-d,', '-t', 'IRIS-SCATTER']).run
+    assert_equal fixture('iris-scatter.txt'), @stderr_file.read
+  end
+
+  test :d do
+    YouPlot::Command.new(['d', '-H', '-d,', '-t', 'IRIS-DENSITY']).run
+    assert_equal fixture('iris-density.txt'), @stderr_file.read
+  end
+
+  test :density do
+    YouPlot::Command.new(['density', '-H', '-d,', '-t', 'IRIS-DENSITY']).run
+    assert_equal fixture('iris-density.txt'), @stderr_file.read
+  end
+
+  test :box do
+    YouPlot::Command.new(['box', '-H', '-d,', '-t', 'IRIS-BOXPLOT']).run
+    assert_equal fixture('iris-boxplot.txt'), @stderr_file.read
+  end
+
+  test :boxplot do
+    YouPlot::Command.new(['boxplot', '-H', '-d,', '-t', 'IRIS-BOXPLOT']).run
+    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 fixture('iris.csv'), @stdout_file.read
+  end
+
+  %i[colors color colours colour].each do |cmd_name|
+    test cmd_name do
+      YouPlot::Command.new([cmd_name.to_s]).run
+      assert_equal fixture('colors.txt'), @stderr_file.read
+      assert_equal '', @stdout_file.read
+    end
+  end
+
+  test :colors_output_stdout do
+    YouPlot::Command.new(['colors', '-o']).run
+    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
--- a/test/youplot/simple_test.rb
+++ b/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
--- a/test/youplot_test.rb
+++ b/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
--- a/youplot.gemspec
+++ b/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.description   = <<~MSG
-    Create ASCII charts on the terminal with data from standard streams in the 
-    pipeline. 
-  MSG
+  spec.summary       = 'A command line tool for Unicode Plotting'
+  spec.description   = 'A command line tool for Unicode Plotting'
  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'
Author	SHA1	Message	Date
kojix2	e3374c825e	v0.3.4	2021-01-21 00:02:30 +09:00
kojix2	c8bdafe9a2	Add encoding test	2021-01-20 23:54:54 +09:00
kojix2	161c85045f	-p option changes the meaning from padding to progress	2021-01-20 23:39:17 +09:00
kojix2	3121c43b14	Add some tests	2021-01-20 23:34:14 +09:00
kojix2	c4e6c7ac8c	Add some tests	2021-01-20 23:10:10 +09:00
kojix2	edf8849d6a	Add test run_as_executable	2021-01-20 22:30:04 +09:00
kojix2	2e4666f9b4	Improved simple test	2021-01-20 22:21:37 +09:00
kojix2	3bbcea165f	Improved error message in barplot	2021-01-20 21:44:08 +09:00
kojix2	3b34ca0e27	Fix a bug	2021-01-20 19:14:58 +09:00
kojix2	abba3e1678	omit count (mac tally)	2021-01-20 00:58:14 +09:00
kojix2	991cf90267	Add test for unrecognized command	2021-01-20 00:57:56 +09:00
kojix2	8db1306e07	Do not exit when using as a library	2021-01-20 00:07:23 +09:00
kojix2	62cc6ba364	Fix style	2021-01-19 23:05:17 +09:00
kojix2	10e096d7c9	Add test count_values_non_tally	2021-01-19 22:37:15 +09:00
kojix2	fbfcf80d25	Add iris-count test	2021-01-19 22:36:36 +09:00
kojix2	8c4011d368	Leave a plot in the terminal on exit.	2021-01-19 20:05:36 +09:00
kojix2	ea4c2a5c70	Hide the cursor in progressive mode	2021-01-19 20:04:29 +09:00
kojix2	c74d54623d	Fix option in line	2021-01-19 19:35:31 +09:00
kojix2	b8e7f5af88	Rubocop auto correct	2021-01-19 19:26:41 +09:00
kojix2	a8ce96888e	Fix xlim and ylim	2021-01-19 19:23:44 +09:00
kojix2	c9513e463f	Add grid to parser	2021-01-19 19:04:08 +09:00
kojix2	b2f2c16c59	Fix style	2021-01-19 18:09:09 +09:00
kojix2	93195713e6	Refactoring of sub_parser	2021-01-19 17:34:18 +09:00
kojix2	2e7a7c8851	Fix canvas option	2021-01-19 16:16:21 +09:00
kojix2	8d6d9158f2	Fix options desc	2021-01-19 16:16:03 +09:00
kojix2	774fa88872	Fix indentation again	2021-01-19 16:00:29 +09:00
kojix2	001434a507	Improved the description of option value types	2021-01-19 15:49:16 +09:00
kojix2	08b946fb7e	Fix typo	2021-01-19 15:48:25 +09:00
kojix2	9fcb647aa5	Improve hist closed options desc	2021-01-19 15:14:57 +09:00
kojix2	68101d31cb	Fix indentation in the here document	2021-01-19 14:56:28 +09:00
kojix2	dbbff1dc3a	Improve bar xscale option	2021-01-19 14:55:28 +09:00
kojix2	e8923dc876	Add acknowledgements to README.md	2021-01-13 18:41:18 +09:00
kojix2	7edbe6f41b	Fix gemspec	2021-01-02 00:30:24 +09:00
kojix2	61168a6223	v0.3.3	2021-01-02 00:27:08 +09:00
kojix2	00b8aee572	Centered the images in the README	2021-01-01 23:06:10 +09:00
kojix2	e760ae504b	Add new logo under improvement (#13 ) * Add the new logo being created Created by sampo grafiikka thanks!!!	2021-01-01 22:54:01 +09:00
kojix2	fae4248d1f	Corrected English text Fixed by @yutaas. Thanks!!! Co-authored-by: Yuta Asano <YutaAsano1986@gmail.com>	2020-12-28 15:05:06 +09:00
kojix2	73b7693915	Fix CI	2020-12-26 22:27:33 +09:00
kojix2	7f3e430cc9	Add Ruby 3.0 to CI	2020-12-26 22:10:49 +09:00
kojix2	1b525f1335	Support headers in progressive mode	2020-12-21 21:43:31 +09:00
kojix2	6d707533a0	Allow DSV to accept single line header	2020-12-21 21:29:39 +09:00
kojix2	60fb611160	Improved progressive mode	2020-12-21 20:51:52 +09:00
kojix2	f0861bcac4	Add experimental progressive mode	2020-12-21 17:09:47 +09:00
kojix2	1669024325	Update README.md	2020-12-21 17:07:22 +09:00
kojix2	9a7f066f3b	Rename input to parse	2020-12-21 16:09:37 +09:00
kojix2	f0c5e631f7	Rename CmdOptions to Options	2020-12-21 14:39:22 +09:00
kojix2	fd7b755c79	Rename DSVReader to DSV	2020-12-21 14:31:54 +09:00
kojix2	d6e1840e58	Update README.md	2020-12-21 08:02:12 +09:00
kojix2	59b81606f5	Fix a typo	2020-12-19 20:26:24 +09:00
kojix2	b5a88e10a2	Update README.md * Mention that English corrections are welcome.	2020-12-19 18:46:01 +09:00
kojix2	6335386762	Update README.md * Fix typo * head line * delimiter	2020-12-19 18:42:04 +09:00
kojix2	887b9d3c53	Update README.md * Write about `--fmt` option	2020-12-19 18:33:37 +09:00
kojix2	eb317e2bb5	v0.3.2	2020-12-17 12:42:00 +09:00
kojix2	edd081562e	Fix color command	2020-12-17 12:38:32 +09:00
kojix2	cc076d5cfe	Fix README.md	2020-12-17 11:43:59 +09:00
kojix2	6f5b73887d	Update README.md	2020-12-16 18:48:34 +09:00
kojix2	e18344cc13	Update README.md	2020-12-16 18:47:55 +09:00
kojix2	ae1e7ba44e	Update README.md	2020-12-16 18:18:29 +09:00
kojix2	4f78920915	Update README.md	2020-12-16 17:40:50 +09:00
kojix2	115ff6623d	Update READMED.md	2020-12-16 16:51:07 +09:00
kojix2	1b666038bb	Changes the default value to stdout if no argument is specified with the `-o` option #9	2020-12-16 12:51:16 +09:00
kojix2	b368dc44b4	Add zenodo badge	2020-12-15 14:31:32 +09:00
kojix2	9581cf730a	Fix style	2020-12-14 22:15:45 +09:00
kojix2	566cee883a	Refactored comand class	2020-12-14 22:02:18 +09:00
kojix2	0aa6de0de5	Added CmdOptions struct	2020-12-14 15:54:54 +09:00
kojix2	5d1a4fdf3c	Rename params -> plot_params	2020-12-14 15:02:32 +09:00
kojix2	a5cdc94bb0	Fix order	2020-12-13 23:46:36 +09:00
kojix2	f2b7b94a09	Add logo to README (#7 )	2020-12-13 15:03:01 +09:00
kojix2	1d92ab8e2d	Update screenshots in README	2020-12-13 09:52:53 +09:00
kojix2	98e294fae9	Add new IRIS.tsv for REDAME	2020-12-13 07:53:55 +09:00
kojix2	0af084916e	Improved README	2020-12-13 00:50:03 +09:00
kojix2	dee53a003c	Add iris_readme.tsv	2020-12-12 22:10:34 +09:00