Enable workflow_dispatch for test

csv  is not part of the default gems since Ruby 3.4.0

.github/FUNDING.yml

@@ -1,2 +1 @@
 ko_fi: kojix2
-patreon: kojix2

.github/workflows/ci.yml

@@ -1,18 +1,17 @@
 name: test
-on: [push, pull_request]
+on: [push, pull_request, workflow_dispatch]
 jobs:
   build:
     name: ${{ matrix.os }} Ruby ${{ matrix.ruby }}
     runs-on: ${{ matrix.os }}-latest
     strategy:
       matrix:
-        os:   ['ubuntu', 'macos']
+        os: ["ubuntu", "macos"]
-        ruby: [ '2.5', '2.6', '2.7' ]
+        ruby: ["2.6", "2.7", "3.0", "3.1", "3.2", "3.3", "3.4"]
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
-      - uses: actions/setup-ruby@v1
+      - uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby }}
-      - run: gem install bundler
+          bundler-cache: true
-      - run: bundle install
       - run: bundle exec rake test

.github/workflows/doc.yml

@@ -0,0 +1,23 @@
+name: doc
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ruby
+      - name: Generate document
+        run: gem install -N yard && yard doc
+      - name: Publish Documentation on GitHub Pages
+        uses: peaceiris/actions-gh-pages@v4
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./doc

Gemfile

@@ -4,3 +4,9 @@ source 'https://rubygems.org'
 
 # Specify your gem's dependencies in youplot.gemspec
 gemspec
+
+group :test do
+  gem 'rake'
+  gem 'simplecov'
+  gem 'test-unit'
+end

README.md

@@ -1,24 +1,46 @@
-![Logo](https://user-images.githubusercontent.com/5798442/102004318-ec89d280-3d52-11eb-8608-d890b42593f1.png)
+<div align="center">
+  <img src="logo.svg">
+  <hr>
+  <a href="https://github.com/red-data-tools/YouPlot/actions/workflows/ci.yml"><img alt="Build Status" src="https://github.com/red-data-tools/YouPlot/workflows/test/badge.svg"></a>
+  <a href="https://rubygems.org/gems/youplot/"><img alt="Gem Version" src="https://badge.fury.io/rb/youplot.svg"></a>
+  <a href="https://zenodo.org/badge/latestdoi/283230219"><img alt="DOI" src="https://zenodo.org/badge/283230219.svg"></a>
+  <a href="https://rubydoc.info/gems/youplot/"><img alt="Docs Stable" src="https://img.shields.io/badge/docs-stable-blue.svg"></a>
+  <a href="LICENSE.txt"><img alt="The MIT License" src="https://img.shields.io/badge/license-MIT-blue.svg"></a>
   
-![Build Status](https://github.com/kojix2/youplot/workflows/test/badge.svg)
+  YouPlot is a command line tool that draws plots on the terminal.
-[![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)
-
-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)
+</div>
 
 ## Installation
 
+```
+brew install youplot
+```
+
 ```
 gem install youplot
 ```
 
+```
+nix shell nixpkgs#youplot
+```
+
+```
+guix install youplot
+```
+
+```
+conda install -c conda-forge ruby
+conda install -c conda-forge compilers
+gem install youplot
+```
+
 ## Quick Start
 
-`cat data.tsv | uplot <command> [options]`
+<img alt="barplot" src="https://user-images.githubusercontent.com/5798442/101999903-d36a2d00-3d24-11eb-9361-b89116f44122.png" width=160> <img alt="histogram" src="https://user-images.githubusercontent.com/5798442/101999820-21cafc00-3d24-11eb-86db-e410d19b07df.png" width=160> <img alt="scatter" src="https://user-images.githubusercontent.com/5798442/101999827-27284680-3d24-11eb-9903-551857eaa69c.png" width=160> <img alt="density" src="https://user-images.githubusercontent.com/5798442/101999828-2abbcd80-3d24-11eb-902c-2f44266fa6ae.png" width=160> <img alt="boxplot" src="https://user-images.githubusercontent.com/5798442/101999830-2e4f5480-3d24-11eb-8891-728c18bf5b35.png" width=160>
+
+`uplot <command> [options] <data.tsv>`
 
 ### barplot
 
@@ -29,7 +51,16 @@ 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>
+
+
+
+```sh
+# For offline user: Sorts files in a directory by size and shows a bar graph.
+ls -l | awk '{print $9, $5}' | sort -nk 2 | uplot bar -d ' '
+```
 
 ### histogram
 
@@ -37,10 +68,13 @@ curl -sL https://git.io/ISLANDScsv \
 echo -e "from numpy import random;" \
         "n = random.randn(10000);"  \
         "print('\\\n'.join(str(i) for i in n))" \
-| python \
+| python3 \
 | 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 +84,17 @@ 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>
+
+```sh
+# For offline users: Calculates sin values (0-2*pi) and plots a sine wave.
+python3 -c '
+from math import sin, pi
+data = "\n".join(f"{i*pi/50}\t{sin(i*pi/50)}" for i in range(101))
+print(data)' | uplot line
+```
 
 ### scatter
 
@@ -60,7 +104,15 @@ 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>
+
+
+```sh
+# For offline users
+cat test/fixtures/iris.csv | cut -f1-4 -d, | uplot scatter -H -d, -t IRIS
+```
 
 ### density
 
@@ -70,7 +122,14 @@ 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>
+
+```sh
+# For offline users
+cat test/fixtures/iris.csv | cut -f1-4 -d, | uplot density -H -d, -t IRIS
+```
 
 ### boxplot
 
@@ -80,61 +139,61 @@ 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>
+
+```sh
+# For offline users
+cat test/fixtures/iris.csv | cut -f1-4 -d, | uplot boxplot -H -d, -t IRIS
+```
 
 ### 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.
+Count processes by user ID.
 
-* https://www.gencodegenes.org/human/
+```sh
+ps aux | awk '{print $1}' | uplot count
+```
+
+Count the number of chromosomes where genes are located. 
 
 ```sh
 cat gencode.v35.annotation.gff3 \
-| grep -v '#' | grep 'gene' | cut -f1 | \
+| grep -v '#' | grep 'gene' | cut -f1 \
- uplot count -t "The number of human gene annotations per chromosome"  -c blue
+| 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>
+
+* [GENCODE - Human Release](https://www.gencodegenes.org/human/)
 
 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 \
-|sort | uniq -c | sort -nrk2 | awk '{print $2,$1}' \
+| sort | uniq -c | sort -nrk1 \
-| uplot bar -d ' ' -t "The number of human gene annotations per chromosome"  -c blue
+| uplot bar --fmt yx -d ' ' -t "The number of human gene annotations per chromosome"  -c blue
 ```
 
 ## Usage
 
-### Why YouPlot?
+### Commands
-
-Wouldn't it be a bit of 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.
 
-|                                   |                                                |
+| Command                                        | Description                       |
-|-----------------------------------|------------------------------------------------|
+|------------------------------------------------|-----------------------------------|
-| Reads data from standard input    | `cat data.tsv \| uplot <command> [options]`    |
+| `cat data.tsv \| uplot <command> [options]`    | Take input from stdin             |
-| Reads data from files             | `uplot <command> [options] data.tsv ...`       |
+| `uplot <command> [options] data.tsv ...`       | Take input from files             |
-| Outputs data from stdin to stdout | `pipeline1 \| uplot <command> -O \| pipeline2` |
+| `pipeline1 \| uplot <command> -O \| pipeline2` | Outputs data from stdin to stdout |
 
-### Where to output the plot?
+### Subcommands
 
-By default, the plot is output to *standard error output*. 
+The following sub-commands are available.
-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.
-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                           |
 |-----------|-------|----------------------------------------|
@@ -145,55 +204,116 @@ The following sub-commands are available
 | scatter   | s     | draw a scatter plot                    |
 | density   | d     | draw a density plot                    |
 | boxplot   | box   | draw a horizontal boxplot              |
+|           |       |                                        |
+| count     | c     | draw a barplot based on the number of occurrences (slow) |
+|           |       |                                        |
+| colors    | color | show the list of available colors      |
 
-See Quick Start for `count`.
+### Output the plot
 
-| command   | short | how it works                                             |
+* `-o`
-|-----------|-------|----------------------------------------------------------|
+  * By default, the plot is output to **standard error output**.
-| count     | c     |  draw a baplot based on the number of occurrences (slow) |
+  * If you want to output to standard output, Use hyphen ` -o -` or no argument `uplot s -o | `.
 
-### How to view detailed command line options
+### Output the input data
 
-Use `--help` to print command-specific options.
+* `-O`
+  * By default, the input data is not shown anywhere.
+  * If you want to pass the input data directly to the standard output, Use hyphen `-O -` or no argument `uplot s -O |`.
+  * This is useful when passing data to a subsequent pipeline.
 
-`uplot hist --help`
+### Header
+
+* `-H`
+  * If input data contains a header line, you need to specify the `-H` option.
+
+### Delimiter
+
+* `-d`
+  * You do not need to use `-d` option for tab-delimited text since the default value is tab.
+  * To specify a blank space, you can use `uplot bar -d ' ' data.txt`. 
+
+### Real-time data
+
+* `-p` `--progress`
+  * Experimental progressive mode is currently under development.
+  * `ruby -e 'loop{puts rand(100)}' | uplot line --progress`
+
+### Show detailed options for subcommands
+
+* `--help`
+  * The `--help` option will show more detailed options for each subcommand.
+  * `uplot hist --help`
+
+### Set columns as x-axis or y-axis
+
+* YouPlot treats the first column as the X axis and the second column as the Y axis. When working with multiple series, the first column is the X axis, the second column is series Y1, the third column is series Y2, 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. 
+
+* `--fmt`
+  * `--fmt xyy` `--fmt xyxy` `--fmt yx` options give you a few more choices. See `youplot <command> --help` for more details. 
+  * The fmt option may be renamed in the future. 
+  * The `-x` and `-y` options might be used to specify columns in the future.
+
+* Use `awk '{print $2, $1}'` to swap columns. Use `paste` to concatenate series.
+
+### Categorical data
+
+* With GNU datamash, you can manage to handle categorized data. 
+  * `cat test/fixtures/iris.csv | sed '/^$/d' | datamash --header-in --output-delimiter=: -t, -g5 collapse 3,4 | cut -f2-3 -d: | sed 's/:/\n/g' | uplot s -d, -T --fmt xyxy`
+  * This is not so easy...
+
+### Time series
+
+* Not yet supported.
+
+### YouPlot Configuration (youplotrc)
+
+You can specify default options in a configuration file in YAML format. For more information, enter the following command.
 
 ```
-Usage: uplot histogram [options] <in.tsv>
+uplot --config
-
-Options for histogram:
-        --symbol VAL         character to be used to plot the bars
-        --closed VAL
-    -n, --nbins VAL          approximate number of bins
-
-Options:
-...
 ```
 
-### How to view the list of available colors?
+## Tools that are useful to use with YouPlot
 
-```sh
+* [csvtk](https://github.com/shenwei356/csvtk)
-uplot colors
+* [GNU datamash](https://www.gnu.org/software/datamash/)
-```
+* [awk](https://www.gnu.org/software/gawk/)
+* [xsv](https://github.com/BurntSushi/xsv)
 
 ## Contributing
 
-* [Report bugs](https://github.com/kojix2/youplot/issues)
+YouPlot is a library under development, so even small improvements like typofix are welcome!
-* Fix bugs and [submit pull requests](https://github.com/kojix2/youplot/pulls)
+Please feel free to send us your pull requests.
-* Write, clarify, or fix documentation
-* Suggest or add new features
 
+* [Report bugs](https://github.com/red-data-tools/YouPlot/issues)
+* Fix bugs and [submit pull requests](https://github.com/red-data-tools/YouPlot/pulls)
+* Write, clarify, or fix documentation
+  * English corrections by native speakers are welcome.
+* Suggest or add new features
+* Make a donation
 
 ### Development
 
 ```sh
-git clone https://github.com/your_name/GR.rb # Clone the Git repo
+# fork the main repository by clicking the Fork button. 
-cd GR.rb
+git clone https://github.com/your_name/YouPlot
 bundle install             # Install the gem dependencies
 bundle exec rake test      # Run the test
 bundle exec rake install   # Installation from source code
+bundle exec exe/uplot      # Run youplot (Try out the edited code)
 ```
 
+    Do you need commit rights to my repository?
+    Do you want to get admin rights and take over the project?
+    If so, please feel free to contact us.
+
+### Acknowledgements
+
+* [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

@@ -1,9 +1,22 @@
 # frozen_string_literal: true
 
-require 'unicode_plot'
+require_relative 'youplot/version'
-require 'youplot/version'
+require_relative 'youplot/dsv'
-require 'youplot/dsv_reader'
+require_relative 'youplot/parameters'
-require 'youplot/command'
+require_relative 'youplot/command'
 
 module YouPlot
+  # @run_as_executable = true / false
+  # YouPlot behaves slightly differently when run as a command line tool
+  # and when run as a script (e.g. for testing). In the event of an error,
+  # when run as a command line tool, YouPlot will display a short error message
+  # and exit abnormally. When run as a script, it will just raise an error.
+  @run_as_executable = false
+  class << self
+    attr_accessor :run_as_executable
+
+    def run_as_executable?
+      @run_as_executable
+    end
+  end
 end

lib/youplot/backends/processing.rb

@@ -6,18 +6,30 @@ module YouPlot
     module Processing
       module_function
 
-      def count_values(arr)
+      def count_values(arr, tally: true, reverse: false)
         # tally was added in Ruby 2.7
-        if Enumerable.method_defined? :tally
+        result = \
+          if tally && Enumerable.method_defined?(:tally)
             arr.tally
           else
-          # https://github.com/marcandre/backports
+            # value_counts Enumerable::Statistics
-          arr.each_with_object(Hash.new(0)) { |item, res| res[item] += 1 }
+            arr.value_counts(dropna: false)
-             .tap { |h| h.default = nil }
           end
-          .sort { |a, b| a[1] <=> b[1] }
+
-          .reverse
+        # sorting
-          .transpose
+        result = result.sort do |a, b|
+          # compare values
+          r = b[1] <=> a[1]
+          # If the values are the same, compare by name
+          r = a[0] <=> b[0] if r.zero?
+          r
+        end
+
+        # --reverse option
+        result.reverse! if reverse
+
+        # prepare for barplot
+        result.transpose
       end
     end
   end

lib/youplot/backends/unicode_plot.rb

@@ -1,20 +1,46 @@
 # frozen_string_literal: true
 
+# UnicodePlot - Plot your data by Unicode characters
+# https://github.com/red-data-tools/unicode_plot.rb
+
 require_relative 'processing'
 require 'unicode_plot'
 
+# If the line color is specified as a number, the program will display an error
+# message to the user and exit. Remove this patch when UnicodePlot is improved.
+
+module UnicodePlot
+  class << self
+    alias lineplot_original lineplot
+    def lineplot(*args, **kw)
+      if kw[:color].is_a? Numeric
+        warn <<~EOS
+          YouPlot: Line colors cannot be specified by numerical values.
+
+          For more information, please see the following issue.
+          https://github.com/red-data-tools/unicode_plot.rb/issues/34
+        EOS
+        YouPlot.run_as_executable ? exit(1) : raise(Error)
+      end
+      lineplot_original(*args, **kw)
+    end
+  end
+end
+
 module YouPlot
   # plotting functions.
   module Backends
-    module UnicodePlotBackend
+    module UnicodePlot
+      class Error < StandardError; end
+
       module_function
 
-      def barplot(data, params, fmt = nil, count: false)
+      def barplot(data, params, fmt = nil, count: false, reverse: false)
         headers = data.headers
         series = data.series
         # `uplot count`
         if count
-          series = Processing.count_values(series[0])
+          series = Processing.count_values(series[0], reverse: reverse)
           params.title = headers[0] if headers
         end
         if series.size == 1
@@ -37,7 +63,7 @@ module YouPlot
           labels = series[x_col]
           values = series[y_col].map(&:to_f)
         end
-        UnicodePlot.barplot(labels, values, **params.to_hc)
+        ::UnicodePlot.barplot(labels, values, **params.to_hc)
       end
 
       def histogram(data, params)
@@ -45,7 +71,7 @@ module YouPlot
         series = data.series
         params.title ||= data.headers[0] if headers
         values = series[0].map(&:to_f)
-        UnicodePlot.histogram(values, **params.to_hc)
+        ::UnicodePlot.histogram(values, **params.to_hc)
       end
 
       def line(data, params, fmt = nil)
@@ -55,7 +81,7 @@ module YouPlot
           # If there is only one series, it is assumed to be sequential data.
           params.ylabel ||= headers[0] if headers
           y = series[0].map(&:to_f)
-          UnicodePlot.lineplot(y, **params.to_hc)
+          ::UnicodePlot.lineplot(y, **params.to_hc)
         else
           # If there are 2 or more series...
           if fmt == 'yx'
@@ -73,7 +99,7 @@ module YouPlot
           end
           x = series[x_col].map(&:to_f)
           y = series[y_col].map(&:to_f)
-          UnicodePlot.lineplot(x, y, **params.to_hc)
+          ::UnicodePlot.lineplot(x, y, **params.to_hc)
         end
       end
 
@@ -90,27 +116,28 @@ 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)
+        plot = ::UnicodePlot.public_send(method1, series[0], series[1], **params.to_hc)
         2.upto(series.size - 1) do |i|
-          UnicodePlot.public_send(method2, plot, series[0], series[i], name: headers&.[](i))
+          ::UnicodePlot.public_send(method2, plot, series[0], series[i], name: headers&.[](i))
         end
         plot
       end
 
       def plot_xyxy(data, method1, params)
         headers = data.headers
-        series = data.series
+        series2 = data.series
+                      .map { |s| s.map(&:to_f) }
+                      .each_slice(2).to_a
         method2 = get_method2(method1)
-        series.map! { |s| s.map(&:to_f) }
-        series = series.each_slice(2).to_a
         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)
+        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))
+          ::UnicodePlot.public_send(method2, plot, xi, yi, name: headers&.[]((i + 1) * 2))
         end
         plot
       end
@@ -148,13 +175,13 @@ module YouPlot
         series = data.series
         headers ||= (1..series.size).map(&:to_s)
         series.map! { |s| s.map(&:to_f) }
-        UnicodePlot.boxplot(headers, series, **params.to_hc)
+        ::UnicodePlot.boxplot(headers, series, **params.to_hc)
       end
 
       def colors(color_names = false)
         # FIXME
         s = String.new
-        UnicodePlot::StyledPrinter::TEXT_COLORS.each do |k, v|
+        ::UnicodePlot::StyledPrinter::TEXT_COLORS.each do |k, v|
           s << v
           s << k.to_s
           unless color_names
@@ -174,19 +201,25 @@ module YouPlot
       def check_series_size(data, fmt)
         series = data.series
         if series.size == 1
-          warn 'youplot: There is only one series of input data. Please check the delimiter.'
+          warn <<~EOS
-          warn ''
+            YouPlot: There is only one series of input data. Please check the delimiter.
-          warn "  Headers: \e[35m#{data.headers.inspect}\e[0m"
+
-          warn "  The first item is: \e[35m\"#{series[0][0]}\"\e[0m"
+            Headers: \e[35m#{data.headers.inspect}\e[0m
-          warn "  The last item is : \e[35m\"#{series[0][-1]}\"\e[0m"
+            The first item is: \e[35m\"#{series[0][0]}\"\e[0m
-          exit 1
+            The last item is : \e[35m\"#{series[0][-1]}\"\e[0m
+          EOS
+          # NOTE: Error messages cannot be colored.
+          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 <<~EOS
-          warn ''
+            YouPlot: In the xyxy format, the number of series must be even.
-          warn "  Number of series: \e[35m#{series.size}\e[0m"
+
-          warn "  Headers: \e[35m#{data.headers.inspect}\e[0m"
+            Number of series: \e[35m#{series.size}\e[0m
-          exit 1
+            Headers: \e[35m#{data.headers.inspect}\e[0m
+          EOS
+          # NOTE: Error messages cannot be colored.
+          YouPlot.run_as_executable ? exit(1) : raise(Error)
         end
       end
     end

lib/youplot/command.rb

@@ -1,10 +1,10 @@
 # frozen_string_literal: true
 
-require_relative 'dsv_reader'
+require_relative 'dsv'
-require_relative 'command/parser'
+require_relative 'parser'
 
 # FIXME
-require_relative 'backends/unicode_plot_backend'
+require_relative 'backends/unicode_plot'
 
 module YouPlot
   Data = Struct.new(:headers, :series)
@@ -19,7 +19,12 @@ module YouPlot
       @command = nil
       @params  = nil
       @options = nil
-      @backend = YouPlot::Backends::UnicodePlotBackend
+      @backend = YouPlot::Backends::UnicodePlot
+    end
+
+    def run_as_executable
+      YouPlot.run_as_executable = true
+      run
     end
 
     def run
@@ -28,33 +33,123 @@ module YouPlot
       @options ||= parser.options
       @params  ||= parser.params
 
+      # color command
       if %i[colors color colours colour].include? @command
         plot = create_plot
         output_plot(plot)
+        return
+      end
+
+      # progressive mode
+      if options[:progressive]
+        stop = false
+        Signal.trap(:INT) { stop = true }
+
+        # make cursor invisible
+        options[:output].print "\e[?25l"
+
+        # mainloop
+        while (input = Kernel.gets)
+          n = main_progressive(input)
+          break if stop
+
+          options[:output].print "\e[#{n}F"
+        end
+
+        options[:output].print "\e[0J"
+        # make cursor visible
+        options[:output].print "\e[?25h"
+
+      # normal mode
       else
         # Sometimes the input file does not end with a newline code.
-        while (input = Kernel.gets(nil))
+        begin
-          main(input)
+          begin
+            input = Kernel.gets(nil)
+          rescue Errno::ENOENT => e
+            warn e.message
+            next
           end
+          main(input)
+        end until input
       end
     end
 
     private
 
     def main(input)
+      # Outputs input data to a file or stdout.
       output_data(input)
 
-      @data = read_dsv(input)
+      @data = parse_dsv(input)
 
+      # Debug mode, show parsed results
       pp @data if options[:debug]
 
+      # When run as a program instead of a library
+      if YouPlot.run_as_executable?
+        begin
           plot = create_plot
+        rescue ArgumentError => e
+          # Show only one line of error.
+          warn e.backtrace[0]
+          # Show error message in purple
+          warn "\e[35m#{e}\e[0m"
+          # Explicitly terminated with exit code: 1
+          exit 1
+        end
+
+      # When running YouPlot as a library (e.g. for testing)
+      else
+        plot = create_plot
+      end
+
       output_plot(plot)
     end
 
-    def read_dsv(input)
+    def main_progressive(input)
-      input = input.dup.force_encoding(options[:encoding]).encode('utf-8') if options[:encoding]
+      output_data(input)
-      DSVReader.input(input, options[:delimiter], options[:headers], options[:transpose])
+
+      # 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 = parse_dsv(@raw_data)
+
+      plot = create_plot
+      output_plot_progressive(plot)
+    end
+
+    def parse_dsv(input)
+      # If encoding is specified, convert to UTF-8
+      if options[:encoding]
+        input.force_encoding(options[:encoding])
+             .encode!('utf-8')
+      end
+
+      begin
+        data = DSV.parse(input, options[:delimiter], options[:headers], options[:transpose])
+      rescue CSV::MalformedCSVError => e
+        warn 'Failed to parse the text. '
+        warn 'Please try to set the correct character encoding with --encoding option.'
+        warn e.backtrace.grep(/youplot/).first
+        exit 1
+      rescue ArgumentError => e
+        warn 'Failed to parse the text. '
+        warn e.backtrace.grep(/youplot/).first
+        exit 1
+      end
+
+      data
     end
 
     def create_plot
@@ -62,12 +157,12 @@ module YouPlot
       when :bar, :barplot
         @backend.barplot(data, params, options[:fmt])
       when :count, :c
-        @backend.barplot(data, params, count: true)
+        @backend.barplot(data, params, count: true, reverse: options[:reverse])
       when :hist, :histogram
         @backend.histogram(data, params)
-      when :line, :lineplot
+      when :line, :lineplot, :l
         @backend.line(data, params, options[:fmt])
-      when :lines, :lineplots
+      when :lines, :lineplots, :ls
         @backend.lines(data, params, options[:fmt])
       when :scatter, :s
         @backend.scatter(data, params, options[:fmt])
@@ -85,7 +180,7 @@ module YouPlot
     def output_data(input)
       # Pass the input to subsequent pipelines
       case options[:pass]
-      when IO
+      when IO, StringIO
         options[:pass].print(input)
       else
         if options[:pass]
@@ -98,13 +193,36 @@ module YouPlot
 
     def output_plot(plot)
       case options[:output]
-      when IO
+      when IO, StringIO
         plot.render(options[:output])
-      else
+      when String, Tempfile
         File.open(options[:output], 'w') do |f|
           plot.render(f)
         end
       end
     end
+
+    def output_plot_progressive(plot)
+      case options[:output]
+      when IO, StringIO
+        # 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/cmd_options.rb

@@ -1,18 +0,0 @@
-# frozen_string_literal: true
-
-module YouPlot
-  class Command
-    CmdOptions = Struct.new(
-      :delimiter,
-      :transpose,
-      :headers,
-      :pass,
-      :output,
-      :fmt,
-      :encoding,
-      :color_names,
-      :debug,
-      keyword_init: true
-    )
-  end
-end

lib/youplot/command/parser.rb

@@ -1,286 +0,0 @@
-# frozen_string_literal: true
-
-require 'optparse'
-require_relative 'cmd_options'
-require_relative 'plot_params'
-
-module YouPlot
-  class Command
-    class Parser
-      attr_reader :command, :options, :params
-
-      def initialize
-        @command = nil
-
-        @options = CmdOptions.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 [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 [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|
-            @options[:delimiter] = v
-          end
-          opt.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|
-            @options[:transpose] = v
-          end
-          opt.on('-t', '--title VAL', 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|
-            params.xlabel = v
-          end
-          opt.on('-y', '--ylabel VAL', 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|
-            params.width = v
-          end
-          opt.on('-h', '--height VAL', 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|
-            params.border = v.to_sym
-          end
-          opt.on('-m', '--margin VAL', 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|
-            params.padding = v
-          end
-          opt.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|
-            params.labels = v
-          end
-          opt.on('--progress', TrueClass, 'progressive') do |v|
-            @options[:progressive] = v
-          end
-          opt.on('--encoding VAL', 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
-          end
-          opt.on('--debug', TrueClass, 'print preprocessed data') do |v|
-            @options[:debug] = v
-          end
-          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`.
-          
-          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
-
-              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
-
-                  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
-
-          # 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
-        end
-      end
-
-      def sub_parser
-        @sub_parser ||= create_default_parser do |parser|
-          parser.banner = <<~MSG
-
-            Usage: YouPlot #{command} [options] <in.tsv>
-
-            Options for #{command}:
-          MSG
-
-          case command
-
-          # If you type only `uplot` in the terminal.
-          when nil
-            warn main_parser.banner
-            warn "\n"
-            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}'"
-            exit 1
-          end
-        end
-      end
-
-      def parse_options(argv = ARGV)
-        begin
-          main_parser.order!(argv)
-        rescue OptionParser::ParseError => e
-          warn "uplot: #{e.message}"
-          exit 1
-        end
-
-        @command = argv.shift&.to_sym
-
-        begin
-          sub_parser.parse!(argv)
-        rescue OptionParser::ParseError => e
-          warn "uplot: #{e.message}"
-          exit 1
-        end
-      end
-    end
-  end
-end

lib/youplot/command/plot_params.rb

@@ -1,37 +0,0 @@
-# frozen_string_literal: true
-
-module YouPlot
-  class Command
-    # UnicodePlot parameters.
-    # * Normally in a Ruby program, you might use hash for the parameter object.
-    # * Here, I use Struct for 2 safety reason.
-    # * The keys are static in Struct.
-    # * Struct does not conflict with keyword arguments. Hash dose.
-    PlotParams = Struct.new(
-      # Sort me!
-      :title,
-      :width,
-      :height,
-      :border,
-      :margin,
-      :padding,
-      :color,
-      :xlabel,
-      :ylabel,
-      :labels,
-      :symbol,
-      :xscale,
-      :nbins,
-      :closed,
-      :canvas,
-      :xlim,
-      :ylim,
-      :grid,
-      :name
-    ) do
-      def to_hc
-        to_h.compact
-      end
-    end
-  end
-end

lib/youplot/dsv.rb

@@ -0,0 +1,87 @@
+# frozen_string_literal: true
+
+require 'csv'
+
+module YouPlot
+  # Module to handle DSV (Delimiter-separated values) format.
+  # Extract header and series.
+  module DSV
+    module_function
+
+    def parse(input, delimiter, headers, transpose)
+      # Parse as CSV
+      arr = CSV.parse(input, col_sep: delimiter)
+
+      # Remove blank lines
+      arr.delete_if do |i|
+        i == [] or i.all?(&:nil?)
+      end
+
+      # get header
+      headers = get_headers(arr, headers, transpose)
+
+      # get series
+      series = get_series(arr, headers, transpose)
+
+      # Return if No header
+      return Data.new(headers, series) if headers.nil?
+
+      # Warn if header contains nil
+      warn "\e[35mHeaders contains nil in it.\e[0m" if headers.include?(nil)
+
+      # Warn if header contains ''
+      warn "\e[35mHeaders contains \"\" in it.\e[0m" if headers.include? ''
+
+      # Make sure the number of elements in the header matches the number of series.
+      h_size = headers.size
+      s_size = series.size
+
+      if h_size > s_size
+        warn "\e[35mThe number of headers is greater than the number of series.\e[0m"
+        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 if YouPlot.run_as_executable?
+      end
+
+      Data.new(headers, series) if h_size == s_size
+    end
+
+    # Transpose different sized ruby arrays
+    # https://stackoverflow.com/q/26016632
+    def transpose2(arr)
+      Array.new(arr.map(&:length).max) { |i| arr.map { |e| e[i] } }
+    end
+
+    def get_headers(arr, headers, transpose)
+      # header(-)
+      return nil unless headers
+
+      # header(+) trenspose(+)
+      return arr.map(&:first) if transpose
+
+      # header(+) transpose(-)
+      arr[0]
+    end
+
+    def get_series(arr, headers, transpose)
+      # header(-)
+      unless headers
+        return arr if transpose
+
+        return transpose2(arr)
+      end
+
+      # header(+) but no element in the series.
+      # TODO: should raise error?
+      return Array.new(arr[0].size, []) if arr.size == 1
+
+      # header(+) transpose(+)
+      return arr.map { |row| row[1..-1] } if transpose
+
+      # header(+) transpose(-)
+      transpose2(arr[1..-1])
+    end
+  end
+end

lib/youplot/dsv_reader.rb

@@ -1,73 +0,0 @@
-# frozen_string_literal: true
-
-require 'csv'
-
-module YouPlot
-  # Read and interpret Delimiter-separated values format file or stream.
-  module DSVReader
-    module_function
-
-    def input(input, delimiter, headers, transpose)
-      arr = parse_as_csv(input, delimiter)
-      headers = get_headers(arr, headers, transpose)
-      series = get_series(arr, headers, transpose)
-      if headers.nil?
-        Data.new(headers, series)
-      else
-        if headers.include?(nil)
-          warn "\e[35mHeaders contains nil in it.\e[0m"
-        elsif headers.include? ''
-          warn "\e[35mHeaders contains \"\" in it.\e[0m"
-        end
-        h_size = headers.size
-        s_size = series.size
-        if h_size == s_size
-          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
-        elsif h_size < s_size
-          warn "\e[35mThe number of headers is less than the number of series.\e[0m"
-          exit 1
-        end
-      end
-    end
-
-    def parse_as_csv(input, delimiter)
-      CSV.parse(input, col_sep: delimiter)
-         .delete_if do |i|
-           i == [] or i.all? nil
-         end
-    end
-
-    # Transpose different sized ruby arrays
-    # https://stackoverflow.com/q/26016632
-    def transpose2(arr)
-      Array.new(arr.map(&:length).max) { |i| arr.map { |e| e[i] } }
-    end
-
-    def get_headers(arr, headers, transpose)
-      if headers
-        if transpose
-          arr.map(&:first)
-        else
-          arr[0]
-        end
-      end
-    end
-
-    def get_series(arr, headers, transpose)
-      if transpose
-        if headers
-          arr.map { |row| row[1..-1] }
-        else
-          arr
-        end
-      elsif headers
-        transpose2(arr[1..-1])
-      else
-        transpose2(arr)
-      end
-    end
-  end
-end

lib/youplot/options.rb

@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+module YouPlot
+  # Command line options that are not Plot parameters
+  Options = Struct.new(
+    :delimiter,
+    :transpose,
+    :headers,
+    :pass,
+    :output,
+    :fmt,
+    :progressive,
+    :encoding,
+    :reverse,      # count
+    :color_names,  # color
+    :debug
+  )
+end

lib/youplot/parameters.rb

@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+module YouPlot
+  # UnicodePlot parameters.
+  # Why Struct, not Hash?
+  # * The keys are static in Struct.
+  # * Struct does not conflict with keyword arguments. Hash dose.
+  Parameters = Struct.new(
+    # Sort me!
+    :title,
+    :width,
+    :height,
+    :border,
+    :margin,
+    :padding,
+    :color,
+    :xlabel,
+    :ylabel,
+    :labels,
+    :symbol,
+    :xscale,
+    :nbins,
+    :closed,
+    :canvas,
+    :xlim,
+    :ylim,
+    :grid,
+    :name
+  ) do
+    def to_hc
+      to_h.compact
+    end
+  end
+end

lib/youplot/parser.rb

@@ -0,0 +1,410 @@
+# frozen_string_literal: true
+
+require 'optparse'
+require_relative 'options'
+
+module YouPlot
+  # Class for parsing command line options
+  class Parser
+    class Error < StandardError; end
+
+    attr_reader :command, :options, :params,
+                :main_parser, :sub_parser,
+                :config_file, :config
+
+    def initialize
+      @command = nil
+
+      @options = Options.new(
+        "\t",    # elimiter:
+        false,   # transpose:
+        nil,     # headers:
+        false,   # pass:
+        $stderr, # output:
+        'xyy',   # fmt:
+        false,   # progressive:
+        nil,     # encoding:
+        false,   # color_names:
+        false    # debug:
+      )
+
+      @params = Parameters.new
+    end
+
+    def apply_config_file
+      return if !config_file && find_config_file.nil?
+
+      read_config_file
+      configure
+    end
+
+    def config_file_candidate_paths
+      # keep the order of the paths
+      paths = []
+      paths << ENV['MYYOUPLOTRC'] if ENV['MYYOUPLOTRC']
+      paths << '.youplot.yml'
+      paths << '.youplotrc'
+      if ENV['HOME']
+        paths << File.join(ENV['HOME'], '.youplotrc')
+        paths << File.join(ENV['HOME'], '.youplot.yml')
+        paths << File.join(ENV['HOME'], '.config', 'youplot', 'youplotrc')
+        paths << File.join(ENV['HOME'], '.config', 'youplot', 'youplot.yml')
+      end
+      paths
+    end
+
+    def find_config_file
+      config_file_candidate_paths.each do |file|
+        path = File.expand_path(file)
+        next unless File.exist?(path)
+
+        @config_file = path
+        ENV['MYYOUPLOTRC'] = path
+        return @config_file
+      end
+      nil
+    end
+
+    def read_config_file
+      require 'yaml'
+      @config = YAML.load_file(config_file)
+    end
+
+    def configure
+      option_members = @options.members
+      param_members = @params.members
+      # It would be more useful to be able to configure by plot type
+      config.each do |k, v|
+        k = k.to_sym
+        if option_members.include?(k)
+          @options[k] ||= v
+        elsif param_members.include?(k)
+          @params[k] ||= v
+        else
+          raise Error, "Unknown option/param in config file: #{k}"
+        end
+      end
+    end
+
+    def create_base_parser
+      OptionParser.new do |parser|
+        parser.program_name  = 'YouPlot'
+        parser.version       = YouPlot::VERSION
+        parser.summary_width = 23
+        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
+        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
+        parser.on('-d', '--delimiter DELIM', String, 'use DELIM instead of [TAB] for field delimiter') do |v|
+          options[:delimiter] = v
+        end
+        parser.on('-H', '--headers', TrueClass, 'specify that the input has header row') do |v|
+          options[:headers] = v
+        end
+        parser.on('-T', '--transpose', TrueClass, 'transpose the axes of the input data') do |v|
+          options[:transpose] = v
+        end
+        parser.on('-t', '--title STR', String, 'print string on the top of plot') do |v|
+          params.title = v
+        end
+        parser.on('--xlabel STR', String, 'print string on the bottom of the plot') do |v|
+          params.xlabel = v
+        end
+        parser.on('--ylabel STR', String, 'print string on the far left of the plot') do |v|
+          params.ylabel = v
+        end
+        parser.on('-w', '--width INT', Numeric, 'number of characters per row') do |v|
+          params.width = v
+        end
+        parser.on('-h', '--height INT', Numeric, 'number of rows') do |v|
+          params.height = v
+        end
+        border_options = UnicodePlot::BORDER_MAP.keys.join(', ')
+        parser.on('-b', '--border STR', String, 'specify the style of the bounding box', "(#{border_options})") do |v|
+          params.border = v.to_sym
+        end
+        parser.on('-m', '--margin INT', Numeric, 'number of spaces to the left of the plot') do |v|
+          params.margin = v
+        end
+        parser.on('--padding INT', Numeric, 'space of the left and right of the plot') do |v|
+          params.padding = v
+        end
+        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
+        parser.on('--[no-]labels', TrueClass, 'hide the labels') do |v|
+          params.labels = v
+        end
+        parser.on('-p', '--progress', TrueClass, 'progressive mode [experimental]') do |v|
+          options[:progressive] = v
+        end
+        parser.on('-C', '--color-output', TrueClass, 'colorize even if writing to a pipe') do |_v|
+          UnicodePlot::IOContext.define_method(:color?) { true } # FIXME
+        end
+        parser.on('-M', '--monochrome', TrueClass, 'no colouring even if writing to a tty') do |_v|
+          UnicodePlot::IOContext.define_method(:color?) { false } # FIXME
+        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.
+        parser.on('--help', 'print sub-command help menu') do
+          puts parser.help
+          exit if YouPlot.run_as_executable?
+        end
+        parser.on('--config FILE', 'specify a config file') do |v|
+          @config_file = v
+        end
+        parser.on('--debug', TrueClass, 'print preprocessed data') do |v|
+          options[:debug] = v
+        end
+        # yield opt if block_given?
+      end
+    end
+
+    def create_main_parser
+      @main_parser = create_base_parser
+      main_parser.banner = \
+        <<~MSG
+
+          Program: YouPlot (Tools for plotting on the terminal)
+          Version: #{YouPlot::VERSION} (using UnicodePlot #{UnicodePlot::VERSION})
+          Source:  https://github.com/red-data-tools/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
+              count      c             draw a barplot based on the number of
+                                       occurrences (slow)
+              colors     color         show the list of available colors
+
+          General options:
+              --config                 print config file info
+              --help                   print command specific help menu
+              --version                print the version of YouPlot
+        MSG
+
+      # Help for the main parser is simple.
+      # Simply show the banner above.
+      main_parser.on('--help', 'print sub-command help menu') do
+        show_main_help
+      end
+
+      main_parser.on('--config', 'show config file info') do
+        show_config_info
+      end
+    end
+
+    def show_main_help(out = $stdout)
+      out.puts main_parser.banner
+      out.puts
+      exit if YouPlot.run_as_executable?
+    end
+
+    def show_config_info
+      if ENV['MYYOUPLOTRC']
+        puts "config file : #{ENV['MYYOUPLOTRC']}"
+        puts config.inspect
+      else
+        puts <<~EOS
+          Configuration file not found.
+          It should be a YAML file, like this example:
+            width : 40
+            height : 20
+          By default, YouPlot will look for the configuration file in these locations:
+          #{config_file_candidate_paths.map { |s| '  ' + s }.join("\n")}
+          If you have the file elsewhere, you can specify its location with the `MYYOUPLOTRC` environment variable.
+        EOS
+      end
+      exit if YouPlot.run_as_executable?
+    end
+
+    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.to_sym
+      end
+    end
+
+    def sub_parser_add_canvas
+      canvas_types = UnicodePlot::Canvas::CANVAS_CLASS_MAP.keys.join(', ')
+      sub_parser.on_head('--canvas STR', String, 'type of canvas', "(#{canvas_types})") 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.map(&:to_f)
+      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.map(&:to_f)
+      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 sub_parser_add_fmt_xyxy
+      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
+    end
+
+    def sub_parser_add_fmt_yx
+      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
+    end
+
+    def create_sub_parser
+      @sub_parser = create_base_parser
+      sub_parser.banner = \
+        <<~MSG
+
+          Usage: YouPlot #{command} [options] <in.tsv>
+
+          Options for #{command}:
+        MSG
+
+      case command
+
+      # If you type only `uplot` in the terminal.
+      # Output help to standard error output.
+      when nil
+        show_main_help($stderr)
+
+      # Output help to standard output.
+      when :help
+        show_main_help
+
+      when :barplot, :bar
+        sub_parser_add_symbol
+        sub_parser_add_fmt_yx
+        sub_parser_add_xscale
+
+      when :count, :c
+        sub_parser.on_head('-r', '--reverse', TrueClass, 'reverse the result of comparisons') do |v|
+          options.reverse = v
+        end
+        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, :l
+        sub_parser_add_canvas
+        sub_parser_add_grid
+        sub_parser_add_fmt_yx
+        sub_parser_add_ylim
+        sub_parser_add_xlim
+
+      when :lineplots, :lines, :ls
+        sub_parser_add_canvas
+        sub_parser_add_grid
+        sub_parser_add_fmt_xyxy
+        sub_parser_add_ylim
+        sub_parser_add_xlim
+
+      when :scatter, :s
+        sub_parser_add_canvas
+        sub_parser_add_grid
+        sub_parser_add_fmt_xyxy
+        sub_parser_add_ylim
+        sub_parser_add_xlim
+
+      when :density, :d
+        sub_parser_add_canvas
+        sub_parser_add_grid
+        sub_parser_add_fmt_xyxy
+        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', TrueClass, 'show color names only') do |v|
+          options[:color_names] = v
+        end
+
+      # Currently it simply displays the configuration file,
+      # but in the future this may be changed to open a text editor like Vim
+      # to edit the configuration file.
+      when :config
+        show_config_info
+
+      else
+        error_message = "YouPlot: unrecognized command '#{command}'"
+        raise Error, error_message unless YouPlot.run_as_executable?
+
+        warn error_message
+        exit 1
+
+      end
+    end
+
+    def parse_options(argv = ARGV)
+      begin
+        create_main_parser.order!(argv)
+      rescue OptionParser::ParseError => e
+        warn "YouPlot: #{e.message}"
+        exit 1 if YouPlot.run_as_executable?
+      end
+
+      @command = argv.shift&.to_sym
+
+      begin
+        create_sub_parser&.parse!(argv)
+      rescue OptionParser::ParseError => e
+        warn "YouPlot: #{e.message}"
+        exit 1 if YouPlot.run_as_executable?
+      end
+
+      begin
+        apply_config_file
+      rescue StandardError => e
+        warn "YouPlot: #{e.message}"
+        exit 1 if YouPlot.run_as_executable?
+      end
+    end
+  end
+end

lib/youplot/version.rb

@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module YouPlot
-  VERSION = '0.3.2'
+  VERSION = '0.4.6'
 end

logo.svg

@@ -0,0 +1,319 @@
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+     <g transform="translate(1232.8 422.93)">
+      <path d="m0 0-0.543 0.703 5.43 4.193 0.543-0.704z" fill="#0079b7"/>
+     </g>
+     <g transform="translate(1239.9 413.79)">
+      <path d="m0 0-0.543 0.703 5.43 4.192 0.543-0.703z" fill="#0079b7"/>
+     </g>
+     <g transform="translate(1225.2 432.78)">
+      <path d="m0 0-0.543 0.702 5.43 4.193 0.543-0.704z" fill="#0079b7"/>
+     </g>
+     <g transform="translate(1242.1 415.85)">
+      <path d="m0 0-4.191 5.43 0.703 0.543 4.191-5.43z" fill="#0079b7"/>
+     </g>
+     <g transform="translate(1229.5 432.12)">
+      <path d="m0 0-2.096 2.715 0.703 0.543 2.096-2.715z" fill="#0079b7"/>
+     </g>
+     <g transform="translate(1263.1 426.88)">
+      <path d="m0 0 6.573-8.515 4.727 3.649-6.573 8.514zm6.413-9.761-7.658 9.921 6.132 4.734 7.658-9.92z" fill="#0079b7"/>
+     </g>
+     <g transform="translate(1265.1 423.6)">
+      <path d="m0 0-0.543 0.702 5.429 4.192 0.543-0.704z" fill="#0079b7"/>
+     </g>
+     <g transform="translate(1272.1 414.47)">
+      <path d="m0 0-0.542 0.703 5.429 4.192 0.543-0.704z" fill="#0079b7"/>
+     </g>
+     <g transform="translate(1261.2 428.67)">
+      <path d="m0 0-0.543 0.703 5.43 4.192 0.543-0.704z" fill="#0079b7"/>
+     </g>
+     <g transform="translate(1274.3 416.52)">
+      <path d="m0 0-2.445 3.168 0.703 0.543 2.445-3.168z" fill="#0079b7"/>
+     </g>
+     <g transform="translate(1264.7 429.03)">
+      <path d="m0 0-1.302 1.685 0.703 0.543 1.301-1.686z" fill="#0079b7"/>
+     </g>
+     <g transform="translate(1240.8 434.62)">
+      <path d="m0 0 13.419-17.383 4.727 3.649-13.419 17.382zm13.259-18.629-14.504 18.789 6.133 4.735 14.504-18.79z" fill="#0079b7"/>
+     </g>
+     <g transform="translate(1250.8 420.93)">
+      <path d="m0 0-0.543 0.703 5.43 4.192 0.543-0.703z" fill="#0079b7"/>
+     </g>
+     <g transform="translate(1261.9 406.54)">
+      <path d="m0 0-0.543 0.703 5.43 4.192 0.543-0.703z" fill="#0079b7"/>
+     </g>
+     <g transform="translate(1238 437.43)">
+      <path d="m0 0-0.542 0.703 5.43 4.192 0.543-0.704z" fill="#0079b7"/>
+     </g>
+     <g transform="translate(1264.1 408.6)">
+      <path d="m0 0-7.612 9.861 0.702 0.543 7.612-9.861z" fill="#0079b7"/>
+     </g>
+     <g transform="translate(1242.3 436.77)">
+      <path d="m0 0-2.096 2.715 0.703 0.542 2.096-2.714z" fill="#0079b7"/>
+     </g>
+    </g>
+   </g>
+  </g>
+ </g>
+</svg>

test/fixtures/iris-count.txt

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

@@ -0,0 +1,12 @@
+       ┌                                        ┐ 
+   -10 ┤■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■ 1.0   
+   -20 ┤■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■ 1.0   
+   -30 ┤■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■ 1.0   
+   -40 ┤■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■ 1.0   
+   -50 ┤■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■ 1.0   
+    10 ┤■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■ 1.0   
+    20 ┤■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■ 1.0   
+    30 ┤■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■ 1.0   
+    40 ┤■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■ 1.0   
+    50 ┤■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■ 1.0   
+       └                                        ┘ 

test/fixtures/simple-histogram-symbol-@.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-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-border-barplot.txt

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

test/fixtures/simple-lineplot-border-corners.txt

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

test/fixtures/simple-lineplot-canvas-ascii.txt

@@ -0,0 +1,18 @@
+       ┌────────────────────────────────────────┐ 
+    50 │                                       |│ 
+       │                              .,       /│ 
+       │                              .\       /│ 
+       │                     .\       |\      .`│ 
+       │             ,       /\      ,`",     . │ 
+       │            /|.     .` .     /  \     | │ 
+       │   .\.     .` \     /  l     /  \     | │ 
+       │-----^r----^---r--------r--------r---|--│ 
+       │.`    \.  |    \   /    |   |    \   |  │ 
+       │`      \./      . .`    |.  |    \   |  │ 
+       │        \`      |./      . .     ", ,`  │ 
+       │                 \`      \ |      \ /   │ 
+       │                 "        |`      \ |   │ 
+       │                          /       ",`   │ 
+   -50 │                                   Y    │ 
+       └────────────────────────────────────────┘ 
+       1                                       10

test/fixtures/simple-lineplot-canvas-density.txt

@@ -0,0 +1,18 @@
+       ┌────────────────────────────────────────┐ 
+    50 │                                       ░│ 
+       │                               ░       ░│ 
+       │                              ░░       ░│ 
+       │                     ░▒       ░░      ░░│ 
+       │             ░       ░░       ░░░     ░ │ 
+       │            ░░      ░░ ░     ░  ░     ░ │ 
+       │   ░▒      ░░ ░     ░  ░     ░  ░     ░ │ 
+       │░░▒░░▒░░░░░▒░░░░░░░░▒░░░░░░░░░░░░░░░░▒░░│ 
+       │░░    ░   ░    ░   ░    ░   ░    ░   ░  │ 
+       │░      ░ ░░    ░░  ░    ░   ░    ░   ░  │ 
+       │        ▒░      ░ ░      ░ ░     ░░ ░░  │ 
+       │                 ░░      ░ ░      ░ ░   │ 
+       │                 ░        ░░      ░ ░   │ 
+       │                          ▓       ░░░   │ 
+   -50 │                                   █    │ 
+       └────────────────────────────────────────┘ 
+       1                                       10

test/fixtures/simple-lineplot-canvas-dot.txt

@@ -0,0 +1,18 @@
+       ┌────────────────────────────────────────┐ 
+    50 │                                       :│ 
+       │                               .       :│ 
+       │                              ::       :│ 
+       │                     .:       ::      .'│ 
+       │             .       ::       :'.     : │ 
+       │            ::      .' :     :  :     : │ 
+       │   .:      .' :     :  :     :  :     : │ 
+       │..:..:.....:..:.....:..:.....:..:....:..│ 
+       │.'    :   :    :   :    :   :    :   :  │ 
+       │'      : .'    '.  :    :   :    :   :  │ 
+       │        :'      : :      : :     '. .'  │ 
+       │                 ::      : :      : :   │ 
+       │                 '        ::      : :   │ 
+       │                          :       '.'   │ 
+   -50 │                                   :    │ 
+       └────────────────────────────────────────┘ 
+       1                                       10

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-no-grid.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-xlim--1-5-ylim--25-50.txt

@@ -0,0 +1,18 @@
+       ┌────────────────────────────────────────┐ 
+    50 │⠀⠀⠀⠀⠀⠀⢸⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⢸⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⢸⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⢸⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⢸⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⢸⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⢸⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢠⢳⠀⠀⠀⠀⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⢸⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⠇⠈⡆⠀⠀⠀⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⢸⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⠔⢣⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡎⠀⠀⠸⡀⠀⠀⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⢸⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡰⠁⠀⠀⢣⠀⠀⠀⠀⠀⠀⠀⠀⡜⠀⠀⠀⠀⢣⠀⠀⠀⠀│ 
+       │⠉⠉⠉⠉⠉⠉⢹⠉⠉⠉⠉⠉⠉⠉⠉⡩⠋⠉⠉⠉⠉⠉⠹⡉⠉⠉⠉⠉⠉⡹⠉⠉⠉⠉⠉⠉⡏⠉⠉⠉│ 
+       │⠀⠀⠀⠀⠀⠀⢸⠀⠀⠀⠀⠀⠀⢀⠜⠀⠀⠀⠀⠀⠀⠀⠀⠱⡀⠀⠀⠀⢰⠁⠀⠀⠀⠀⠀⠀⠸⡀⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⢸⠀⠀⠀⠀⠀⠀⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠑⡄⠀⢠⠃⠀⠀⠀⠀⠀⠀⠀⠀⢣⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⢸⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠘⣄⠇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⡆⠀│ 
+   -25 │⠀⠀⠀⠀⠀⠀⢸⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠸⡀│ 
+       └────────────────────────────────────────┘ 
+       -1                                       5

test/fixtures/simple-lineplot-xlim--1-5.txt

@@ -0,0 +1,18 @@
+       ┌────────────────────────────────────────┐ 
+    50 │⠀⠀⠀⠀⠀⠀⢸⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⢸⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⢸⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⢸⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⢸⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣄⠀⠀⠀⠀⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⢸⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⠜⠈⡆⠀⠀⠀⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⢸⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⡠⠊⠣⡀⠀⠀⠀⠀⠀⠀⠀⠀⢀⠎⠀⠀⠘⡄⠀⠀⠀⠀│ 
+       │⠤⠤⠤⠤⠤⠤⢼⠤⠤⠤⠤⠤⠤⠤⠤⢤⠴⠥⠤⠤⠤⠵⢤⠤⠤⠤⠤⠤⠤⢤⠮⠤⠤⠤⠤⠼⡤⠤⠤⠤│ 
+       │⠀⠀⠀⠀⠀⠀⢸⠀⠀⠀⠀⠀⠀⢀⠔⠁⠀⠀⠀⠀⠀⠀⠈⠢⡀⠀⠀⠀⢠⠃⠀⠀⠀⠀⠀⠀⠱⡀⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⢸⠀⠀⠀⠀⠀⠀⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠑⢄⠀⢠⠃⠀⠀⠀⠀⠀⠀⠀⠀⢱⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⢸⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⠲⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢣⠀│ 
+       │⠀⠀⠀⠀⠀⠀⢸⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢣│ 
+       │⠀⠀⠀⠀⠀⠀⢸⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈│ 
+       │⠀⠀⠀⠀⠀⠀⢸⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│ 
+   -50 │⠀⠀⠀⠀⠀⠀⢸⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│ 
+       └────────────────────────────────────────┘ 
+       -1                                       5

test/fixtures/simple-lineplot-ylabel.txt

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

test/fixtures/simple-lineplot-ylim--25-50.txt

@@ -0,0 +1,18 @@
+       ┌────────────────────────────────────────┐ 
+    50 │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢠⡇⠀⠀⠀⠀⠀⠀⠀⡜│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸⢇⠀⠀⠀⠀⠀⠀⠀⡇│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⡇⠀⠀⠀⠀⠀⠀⠀⡎⢸⠀⠀⠀⠀⠀⠀⢀⠇│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸⢸⠀⠀⠀⠀⠀⠀⠀⡇⠸⡀⠀⠀⠀⠀⠀⢸⠀│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⢧⠀⠀⠀⠀⠀⠀⠀⡇⠘⡄⠀⠀⠀⠀⠀⢸⠀⠀⡇⠀⠀⠀⠀⠀⢸⠀│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡸⠸⡀⠀⠀⠀⠀⠀⢠⠃⠀⡇⠀⠀⠀⠀⠀⢸⠀⠀⢇⠀⠀⠀⠀⠀⡇⠀│ 
+       │⠀⠀⠀⢠⠳⡀⠀⠀⠀⠀⠀⢠⠃⠀⢇⠀⠀⠀⠀⠀⡸⠀⠀⢱⠀⠀⠀⠀⠀⡇⠀⠀⢸⠀⠀⠀⠀⠀⡇⠀│ 
+       │⠀⠀⡠⠃⠀⢣⠀⠀⠀⠀⠀⡜⠀⠀⢸⠀⠀⠀⠀⠀⡇⠀⠀⠸⡀⠀⠀⠀⢀⠇⠀⠀⠸⡀⠀⠀⠀⢰⠁⠀│ 
+       │⠉⡹⠉⠉⠉⠉⡏⠉⠉⠉⢹⠉⠉⠉⠉⡏⠉⠉⠉⢹⠉⠉⠉⠉⡏⠉⠉⠉⢹⠉⠉⠉⠉⡏⠉⠉⠉⢹⠉⠉│ 
+       │⡰⠁⠀⠀⠀⠀⠘⡄⠀⠀⡎⠀⠀⠀⠀⢸⠀⠀⠀⡜⠀⠀⠀⠀⢱⠀⠀⠀⡜⠀⠀⠀⠀⢇⠀⠀⠀⡜⠀⠀│ 
+       │⠁⠀⠀⠀⠀⠀⠀⢱⠀⢰⠁⠀⠀⠀⠀⠈⡆⠀⢀⠇⠀⠀⠀⠀⢸⠀⠀⠀⡇⠀⠀⠀⠀⢸⠀⠀⠀⡇⠀⠀│ 
+       │⠀⠀⠀⠀⠀⠀⠀⠀⢣⡇⠀⠀⠀⠀⠀⠀⢱⠀⢸⠀⠀⠀⠀⠀⠀⡇⠀⢰⠁⠀⠀⠀⠀⠸⡀⠀⢀⠇⠀⠀│ 
+   -25 │⠀⠀⠀⠀⠀⠀⠀⠀⠈⠀⠀⠀⠀⠀⠀⠀⠘⡄⡎⠀⠀⠀⠀⠀⠀⢣⠀⣸⠀⠀⠀⠀⠀⠀⡇⠀⢸⠀⠀⠀│ 
+       └────────────────────────────────────────┘ 
+       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/unicode_plot_test.rb

@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+require_relative 'test_helper'
+require 'unicode_plot'
+
+# Check the UnicodePlot constants that YouPlot depends on.
+# Prepare for UnicodePlot version upgrades.
+class UnicodePlotTest < Test::Unit::TestCase
+  test 'VERSION' do
+    assert UnicodePlot::VERSION
+  end
+
+  test 'BORDER_MAP' do
+    assert_instance_of Hash, UnicodePlot::BORDER_MAP
+  end
+
+  test 'PREDEFINED_TRANSFORM_FUNCTIONS' do
+    assert_instance_of Hash, UnicodePlot::ValueTransformer::PREDEFINED_TRANSFORM_FUNCTIONS
+  end
+end

test/youplot/backends/processing_test.rb

@@ -2,10 +2,16 @@
 
 require_relative '../../test_helper'
 
-class YouPlotCommandTest < Test::Unit::TestCase
+class ProcessingTest < Test::Unit::TestCase
   test :count_values do
     @m = YouPlot::Backends::Processing
     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/backends/unicode_plot_backend_test.rb

@@ -1,6 +0,0 @@
-# frozen_string_literal: true
-
-require_relative '../../test_helper'
-
-class YouPlotPlotTest < Test::Unit::TestCase
-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
@@ -28,25 +28,23 @@ class YouPlotCommandTest < Test::Unit::TestCase
 
   def teardown
     @stderr_file.close
+    @stdout_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
+  # barplot doesn't make sense, but just to make sure it works.
-    YouPlot::Command.new(['hist', '-H', '-d,', '-t', 'IRIS-HISTOGRAM']).run
+
-    assert_equal fixture('iris-histogram.txt'), @stderr_file.read
+  test :bar do
+    YouPlot::Command.new(['bar', '-H', '-d,', '-t', 'IRIS-BARPLOT']).run
+    assert_equal fixture('iris-barplot.txt'), @stderr_file.read
   end
 
   test :histogram do
@@ -54,19 +52,27 @@ class YouPlotCommandTest < Test::Unit::TestCase
     assert_equal fixture('iris-histogram.txt'), @stderr_file.read
   end
 
-  test :line do
+  test :hist do
-    YouPlot::Command.new(['line', '-H', '-d,', '-t', 'IRIS-LINEPLOT']).run
+    YouPlot::Command.new(['hist', '-H', '-d,', '-t', 'IRIS-HISTOGRAM']).run
-    assert_equal fixture('iris-lineplot.txt'), @stderr_file.read
+    assert_equal fixture('iris-histogram.txt'), @stderr_file.read
   end
 
+  # Yeah, lineplot/lineplots don't make sense too.
+
   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
+  test :line do
-    YouPlot::Command.new(['lines', '-H', '-d,', '-t', 'IRIS-LINEPLOTS']).run
+    YouPlot::Command.new(['line', '-H', '-d,', '-t', 'IRIS-LINEPLOT']).run
-    assert_equal fixture('iris-lineplots.txt'), @stderr_file.read
+    assert_equal fixture('iris-lineplot.txt'), @stderr_file.read
+  end
+
+  # l is an undocumented alias of lineplot.
+  test :l do
+    YouPlot::Command.new(['l', '-H', '-d,', '-t', 'IRIS-LINEPLOT']).run
+    assert_equal fixture('iris-lineplot.txt'), @stderr_file.read
   end
 
   test :lineplots do
@@ -74,9 +80,15 @@ class YouPlotCommandTest < Test::Unit::TestCase
     assert_equal fixture('iris-lineplots.txt'), @stderr_file.read
   end
 
-  test :s do
+  test :lines do
-    YouPlot::Command.new(['s', '-H', '-d,', '-t', 'IRIS-SCATTER']).run
+    YouPlot::Command.new(['lines', '-H', '-d,', '-t', 'IRIS-LINEPLOTS']).run
-    assert_equal fixture('iris-scatter.txt'), @stderr_file.read
+    assert_equal fixture('iris-lineplots.txt'), @stderr_file.read
+  end
+
+  # ls is an undocumented alias of lineplots.
+  test :ls do
+    YouPlot::Command.new(['lines', '-H', '-d,', '-t', 'IRIS-LINEPLOTS']).run
+    assert_equal fixture('iris-lineplots.txt'), @stderr_file.read
   end
 
   test :scatter do
@@ -84,9 +96,9 @@ class YouPlotCommandTest < Test::Unit::TestCase
     assert_equal fixture('iris-scatter.txt'), @stderr_file.read
   end
 
-  test :d do
+  test :s do
-    YouPlot::Command.new(['d', '-H', '-d,', '-t', 'IRIS-DENSITY']).run
+    YouPlot::Command.new(['s', '-H', '-d,', '-t', 'IRIS-SCATTER']).run
-    assert_equal fixture('iris-density.txt'), @stderr_file.read
+    assert_equal fixture('iris-scatter.txt'), @stderr_file.read
   end
 
   test :density do
@@ -94,9 +106,9 @@ class YouPlotCommandTest < Test::Unit::TestCase
     assert_equal fixture('iris-density.txt'), @stderr_file.read
   end
 
-  test :box do
+  test :d do
-    YouPlot::Command.new(['box', '-H', '-d,', '-t', 'IRIS-BOXPLOT']).run
+    YouPlot::Command.new(['d', '-H', '-d,', '-t', 'IRIS-DENSITY']).run
-    assert_equal fixture('iris-boxplot.txt'), @stderr_file.read
+    assert_equal fixture('iris-density.txt'), @stderr_file.read
   end
 
   test :boxplot do
@@ -104,15 +116,36 @@ class YouPlotCommandTest < Test::Unit::TestCase
     assert_equal fixture('iris-boxplot.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
+
+  # Yeah, lineplot/lineplots don't make sense too.
+  # Just checking the behavior.
+
+  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
+
+  # Output options.
+
   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 +161,18 @@ 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::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 +1,272 @@
+# 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
+    @stdout_file.close
+  end
+
+  def fixture(fname)
+    File.read(File.expand_path("../fixtures/#{fname}", __dir__))
+  end
+
+  # Single command
+  # The goal is to verify that the command works without any options.
+
+  test :barplot do
+    assert_raise(ArgumentError) do
+      YouPlot::Command.new(['barplot']).run
+    end
+  end
+
+  test :bar do
+    assert_raise(ArgumentError) do
+      YouPlot::Command.new(['bar']).run
+    end
+  end
+
+  test :histogram do
+    YouPlot::Command.new(['histogram']).run
+    assert_equal fixture('simple-histogram.txt'), @stderr_file.read
+  end
+
+  test :hist do
+    YouPlot::Command.new(['hist']).run
+    assert_equal fixture('simple-histogram.txt'), @stderr_file.read
+  end
+
+  test :lineplot do
+    YouPlot::Command.new(['lineplot']).run
+    assert_equal fixture('simple-lineplot.txt'), @stderr_file.read
+  end
+
+  test :line do
+    YouPlot::Command.new(['line']).run
+    assert_equal fixture('simple-lineplot.txt'), @stderr_file.read
+  end
+
+  test :lineplots do
+    assert_raise(YouPlot::Backends::UnicodePlot::Error) do
+      YouPlot::Command.new(['lineplots']).run
+    end
+  end
+
+  test :lines do
+    assert_raise(YouPlot::Backends::UnicodePlot::Error) do
+      YouPlot::Command.new(['lines']).run
+    end
+  end
+
+  test :scatter do
+    assert_raise(YouPlot::Backends::UnicodePlot::Error) do
+      YouPlot::Command.new(['scatter']).run
+    end
+  end
+
+  test :s do
+    assert_raise(YouPlot::Backends::UnicodePlot::Error) do
+      YouPlot::Command.new(['s']).run
+    end
+  end
+
+  test :density do
+    assert_raise(YouPlot::Backends::UnicodePlot::Error) do
+      YouPlot::Command.new(['density']).run
+    end
+  end
+
+  test :d do
+    assert_raise(YouPlot::Backends::UnicodePlot::Error) do
+      YouPlot::Command.new(['d']).run
+    end
+  end
+
+  test :boxplot do
+    YouPlot::Command.new(['boxplot']).run
+    assert_equal fixture('simple-boxplot.txt'), @stderr_file.read
+  end
+
+  test :box do
+    YouPlot::Command.new(['box']).run
+    assert_equal fixture('simple-boxplot.txt'), @stderr_file.read
+  end
+
+  test :count do
+    YouPlot::Command.new(['c']).run
+    assert_equal fixture('simple-count.txt'), @stderr_file.read
+  end
+
+  test :c do
+    YouPlot::Command.new(['count']).run
+    assert_equal fixture('simple-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_ylabel do
+    YouPlot::Command.new(['line', '--ylabel', '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', '-h', '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
+
+  test :line_border_corners do
+    YouPlot::Command.new(['line', '--border', 'corners']).run
+    assert_equal fixture('simple-lineplot-border-corners.txt'), @stderr_file.read
+  end
+
+  test :line_b_corners do
+    YouPlot::Command.new(['line', '-b', 'corners']).run
+    assert_equal fixture('simple-lineplot-border-corners.txt'), @stderr_file.read
+  end
+
+  test :line_border_barplot do
+    YouPlot::Command.new(['line', '--border', 'barplot']).run
+    assert_equal fixture('simple-lineplot-border-barplot.txt'), @stderr_file.read
+  end
+
+  test :line_b_barplot do
+    YouPlot::Command.new(['line', '-b', 'barplot']).run
+    assert_equal fixture('simple-lineplot-border-barplot.txt'), @stderr_file.read
+  end
+
+  test :line_canvas_ascii do
+    YouPlot::Command.new(['line', '--canvas', 'ascii']).run
+    assert_equal fixture('simple-lineplot-canvas-ascii.txt'), @stderr_file.read
+  end
+
+  test :line_canvas_braille do
+    YouPlot::Command.new(['line', '--canvas', 'braille']).run
+    assert_equal fixture('simple-lineplot.txt'), @stderr_file.read
+  end
+
+  test :line_canvas_density do
+    YouPlot::Command.new(['line', '--canvas', 'density']).run
+    assert_equal fixture('simple-lineplot-canvas-density.txt'), @stderr_file.read
+  end
+
+  test :line_canvas_dot do
+    YouPlot::Command.new(['line', '--canvas', 'dot']).run
+    assert_equal fixture('simple-lineplot-canvas-dot.txt'), @stderr_file.read
+  end
+
+  # test :line_canvas_block do
+  #   YouPlot::Command.new(['line', '--canvas', 'block']).run
+  #   assert_equal fixture('simple-lineplot-canvas-dot.txt'), @stderr_file.read
+  # end
+
+  test :hist_symbol_atmark do
+    YouPlot::Command.new(['hist', '--symbol', '@']).run
+    assert_equal fixture('simple-histogram-symbol-@.txt'), @stderr_file.read
+  end
+
+  test :line_xlim do
+    YouPlot::Command.new(['line', '--xlim', '-1,5']).run
+    assert_equal fixture('simple-lineplot-xlim--1-5.txt'), @stderr_file.read
+  end
+
+  test :line_ylim do
+    YouPlot::Command.new(['line', '--ylim', '-25,50']).run
+    assert_equal fixture('simple-lineplot-ylim--25-50.txt'), @stderr_file.read
+  end
+
+  test :line_xlim_and_ylim do
+    YouPlot::Command.new(['line', '--xlim', '-1,5', '--ylim', '-25,50']).run
+    assert_equal fixture('simple-lineplot-xlim--1-5-ylim--25-50.txt'), @stderr_file.read
+  end
+
+  test :line_grid do
+    YouPlot::Command.new(['line', '--grid']).run
+    assert_equal fixture('simple-lineplot.txt'), @stderr_file.read
+  end
+
+  test :line_no_grid do
+    YouPlot::Command.new(['line', '--no-grid']).run
+    assert_equal fixture('simple-lineplot-no-grid.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

@@ -8,24 +8,17 @@ 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 
+  spec.homepage      = 'https://github.com/red-data-tools/YouPlot'
-    pipeline. 
-  MSG
-  spec.homepage      = 'https://github.com/kojix2/youplot'
   spec.license       = 'MIT'
-  spec.required_ruby_version = Gem::Requirement.new('>= 2.4.0')
+  spec.required_ruby_version = Gem::Requirement.new('>= 2.5.0')
 
   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'
+  spec.add_dependency 'csv'
-  spec.add_development_dependency 'bundler'
+  spec.add_dependency 'unicode_plot', '>= 0.0.5'
-  spec.add_development_dependency 'rake'
-  spec.add_development_dependency 'rubocop'
-  spec.add_development_dependency 'simplecov'
-  spec.add_development_dependency 'test-unit'
 end