Enable workflow_dispatch for test

csv  is not part of the default gems since Ruby 3.4.0

.github/FUNDING.yml

@@ -1,2 +1 @@
-github: kojix2
 ko_fi: 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: [ '2.6', '2.7', '3.0' ]
+        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: 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

@@ -1,27 +1,46 @@
-<p align="center">
+<div align="center">
-  <img src="logo.svg" width="60%" height="60%" />
+  <img src="logo.svg">
-</7>
+  <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 Stable](https://img.shields.io/badge/docs-stable-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]` or
+<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>`
+
+`uplot <command> [options] <data.tsv>`
 
 ### barplot
 
@@ -36,13 +55,20 @@ curl -sL https://git.io/ISLANDScsv \
   <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
 
 ```sh
 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
 ```
 
@@ -62,6 +88,14 @@ curl -sL https://git.io/AirPassengers \
   <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
 
 ```sh
@@ -74,6 +108,12 @@ curl -sL https://git.io/IRIStsv \
   <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
 
 ```sh
@@ -86,6 +126,11 @@ curl -sL https://git.io/IRIStsv \
   <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
 
 ```sh
@@ -98,59 +143,55 @@ curl -sL https://git.io/IRIStsv \
   <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 it creates 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
 ```
 
 <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 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 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 output file or stream for the plot can be specified with the `-o` option.
-
-### Where to output the input data?
-
-By default, the input data is not shown anywhere.
-The `-O` option, with no arguments, outputs the input data directly to the standard output. This is useful when passing data to a subsequent pipeline.
-
-### What types of plots are available?
 
 The following sub-commands are available.
 
@@ -163,67 +204,95 @@ The following sub-commands are available.
 | scatter   | s     | draw a scatter plot                    |
 | density   | d     | draw a density plot                    |
 | boxplot   | box   | draw a horizontal boxplot              |
-
+|           |       |                                        |
-See Quick Start for `count`.
-
-| command   | short | how it works                                             |
-|-----------|-------|----------------------------------------------------------|
 | count     | c     | draw a barplot based on the number of occurrences (slow) |
+|           |       |                                        |
+| colors    | color | show the list of available colors      |
 
-### What if the header line is included?
+### Output the plot
 
-If your input data contains a header line, you need to specify the `-H` option.
+* `-o`
+  * By default, the plot is output to **standard error output**.
+  * If you want to output to standard output, Use hyphen ` -o -` or no argument `uplot s -o | `.
 
-### How to specify the delimiter?
+### Output the input data
 
-Use the `-d` option. To specify a blank space, you can use `uplot bar -d ' ' data.txt`. You do not need to use `-d` option for tab-delimited text since the default value is tab.
+* `-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.
 
-### Is there a way to specify a column as the x-axis or y-axis?
+### Header
 
-Not yet. In principle, YouPlot treats the first column as the X axis and the second column as the Y axis. When working with multiple series, the first row is the X axis, the second row is series 1, the third row is series 2, and so on. If you pass only one column of data for `line` and `bar`, YouPlot will automatically use a sequential number starting from 1 as the X-axis. The　`--fmt xyy`, `--fmt xyxy` and `--fmt yx` options give you a few more choices. See `youplot <command> --help` for more details. YouPlot has limited functionalities, but you can use shell scripts such as `awk '{print $2, $1}'` to swap lines.
+* `-H`
+  * If input data contains a header line, you need to specify the `-H` option.
 
-### How to plot real-time data?
+### Delimiter
 
-Experimental progressive mode is currently under development.
+* `-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`. 
 
-```sh
+### Real-time data
-ruby -e 'loop{puts rand(100)}' | uplot line --progress
-```
 
-### How to view detailed command line options?
+* `-p` `--progress`
+  * Experimental progressive mode is currently under development.
+  * `ruby -e 'loop{puts rand(100)}' | uplot line --progress`
 
-Use `--help` to print command-specific options.
+### Show detailed options for subcommands
 
-`uplot hist --help`
+* `--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         side of the intervals to be closed [left]
-    -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
 
-YouPlot is a library under development, so even small improvements like typofix are welcome! Please feel free to send us your pull requests.
+YouPlot is a library under development, so even small improvements like typofix are welcome!
+Please feel free to send us your pull requests.
 
-* [Report bugs](https://github.com/kojix2/youplot/issues)
+* [Report bugs](https://github.com/red-data-tools/YouPlot/issues)
-* Fix bugs and [submit pull requests](https://github.com/kojix2/youplot/pulls)
+* 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
 
@@ -233,11 +302,15 @@ 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
 
-* [Red Data Tools](https://github.com/red-data-tools) - Technical support
 * [sampo grafiikka](https://jypg.net/sampo_grafiikka) - Project logo creation
 * [yutaas](https://github.com/yutaas) - English proofreading
 

lib/youplot.rb

@@ -1,11 +1,17 @@
 # frozen_string_literal: true
 
-require 'unicode_plot'
+require_relative 'youplot/version'
-require 'youplot/version'
+require_relative 'youplot/dsv'
-require 'youplot/dsv'
+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
 
@@ -13,5 +19,4 @@ module YouPlot
       @run_as_executable
     end
   end
-  @run_as_executable = false
 end

lib/youplot/backends/processing.rb

@@ -6,18 +6,30 @@ module YouPlot
     module Processing
       module_function
 
-      def count_values(arr, tally: true)
+      def count_values(arr, tally: true, reverse: false)
         # tally was added in Ruby 2.7
+        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

@@ -1,22 +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
@@ -39,7 +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)
@@ -47,7 +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)
@@ -57,7 +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'
@@ -75,7 +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
 
@@ -94,27 +118,26 @@ module YouPlot
         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) }
-        series2 = series.each_slice(2).to_a
-        series = nil
         params.name ||= headers[0] if headers
         params.xlim ||= series2.map(&:first).flatten.minmax # why need?
         params.ylim ||= series2.map(&:last).flatten.minmax # why need?
         x1, y1 = series2.shift
-        plot = UnicodePlot.public_send(method1, x1, y1, **params.to_hc)
+        plot = ::UnicodePlot.public_send(method1, x1, y1, **params.to_hc)
         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
@@ -152,13 +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
@@ -179,7 +202,7 @@ module YouPlot
         series = data.series
         if series.size == 1
           warn <<~EOS
-            youplot: There is only one series of input data. Please check the delimiter.
+            YouPlot: There is only one series of input data. Please check the delimiter.
 
             Headers: \e[35m#{data.headers.inspect}\e[0m
             The first item is: \e[35m\"#{series[0][0]}\"\e[0m

lib/youplot/command.rb

@@ -1,10 +1,10 @@
 # frozen_string_literal: true
 
 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 +19,7 @@ module YouPlot
       @command = nil
       @params  = nil
       @options = nil
-      @backend = YouPlot::Backends::UnicodePlotBackend
+      @backend = YouPlot::Backends::UnicodePlot
     end
 
     def run_as_executable
@@ -33,49 +33,77 @@ module YouPlot
       @options ||= parser.options
       @params  ||= parser.params
 
+      # color command
       if %i[colors color colours colour].include? @command
         plot = create_plot
         output_plot(plot)
-      elsif options[:progressive]
+        return
+      end
+
+      # progressive mode
+      if options[:progressive]
         stop = false
         Signal.trap(:INT) { stop = true }
-        options[:output].print "\e[?25l" # make cursor invisible
+
+        # 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"
-        options[:output].print "\e[?25h" # make cursor visible
+        # 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
 
@@ -95,15 +123,33 @@ module YouPlot
       @raw_data << input
 
       # FIXME
-      @data = read_dsv(@raw_data)
+      @data = parse_dsv(@raw_data)
 
       plot = create_plot
       output_plot_progressive(plot)
     end
 
-    def read_dsv(input)
+    def parse_dsv(input)
-      input = input.dup.force_encoding(options[:encoding]).encode('utf-8') if options[:encoding]
+      # If encoding is specified, convert to UTF-8
-      DSV.parse(input, options[:delimiter], options[:headers], options[:transpose])
+      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
@@ -111,12 +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])
@@ -134,7 +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]
@@ -147,9 +193,9 @@ 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
@@ -158,7 +204,7 @@ module YouPlot
 
     def output_plot_progressive(plot)
       case options[:output]
-      when IO
+      when IO, StringIO
         # RefactorMe
         out = StringIO.new(String.new)
         def out.tty?

lib/youplot/command/options.rb

@@ -1,19 +0,0 @@
-# frozen_string_literal: true
-
-module YouPlot
-  class Command
-    Options = Struct.new(
-      :delimiter,
-      :transpose,
-      :headers,
-      :pass,
-      :output,
-      :fmt,
-      :progressive,
-      :encoding,
-      :color_names,
-      :debug,
-      keyword_init: true
-    )
-  end
-end

lib/youplot/command/parser.rb

@@ -1,305 +0,0 @@
-# frozen_string_literal: true
-
-require 'optparse'
-require_relative 'options'
-require_relative 'plot_params'
-
-module YouPlot
-  class Command
-    class Parser
-      class Error < StandardError; end
-
-      attr_reader :command, :options, :params,
-                  :main_parser, :sub_parser
-
-      def initialize
-        @command = nil
-
-        @options = Options.new(
-          delimiter: "\t",
-          transpose: false,
-          headers: nil,
-          pass: false,
-          output: $stderr,
-          fmt: 'xyy',
-          progressive: false,
-          encoding: nil,
-          color_names: false,
-          debug: false
-        )
-
-        @params = PlotParams.new
-      end
-
-      def create_default_parser
-        OptionParser.new do |parser|
-          parser.program_name  = 'YouPlot'
-          parser.version       = YouPlot::VERSION
-          parser.summary_width = 24
-          parser.on_tail('') # Add a blank line at the end
-          parser.separator('')
-          parser.on('Common options:')
-          parser.on('-O', '--pass [FILE]', 'file to output input data to [stdout]',
-                    'for inserting YouPlot in the middle of Unix pipes') do |v|
-            options[:pass] = v || $stdout
-          end
-          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('-x', '--xlabel STR', String, 'print string on the bottom of the plot') do |v|
-            params.xlabel = v
-          end
-          parser.on('-y', '--ylabel STR', String, 'print string on the far left of the plot') do |v|
-            params.ylabel = v
-          end
-          parser.on('-w', '--width INT', Integer, '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::StyledPrinter.define_method(:color?){ |o| true }
-          end
-          parser.on('-M', '--monochrome', TrueClass, 'no colouring even if writing to a tty') do |v|
-            UnicodePlot::StyledPrinter.define_method(:color?){ |o| false }
-          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('--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_default_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
-
-        # Help for the main parser is simple.
-        # Simply show the banner above.
-        main_parser.on('--help', 'print sub-command help menu') do
-          puts main_parser.banner
-          puts
-          exit if YouPlot.run_as_executable?
-        end
-      end
-
-      def sub_parser_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
-        sub_parser.on_head('--canvas STR', String, 'type of canvas') do |v|
-          params.canvas = v.to_sym
-        end
-      end
-
-      def sub_parser_add_xlim
-        sub_parser.on_head('--xlim FLOAT,FLOAT', Array, 'plotting range for the x coordinate') do |v|
-          params.xlim = v
-        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
-        end
-      end
-
-      def sub_parser_add_grid
-        sub_parser.on_head('--[no-]grid', TrueClass, 'draws grid-lines at the origin') do |v|
-          params.grid = v
-        end
-      end
-
-      def create_sub_parser
-        @sub_parser = create_default_parser
-        sub_parser.banner = \
-          <<~MSG
-
-            Usage: YouPlot #{command} [options] <in.tsv>
-
-            Options for #{command}:
-          MSG
-
-        case command
-
-        # If you type only `uplot` in the terminal.
-        when nil
-          warn main_parser.banner
-          warn "\n"
-          exit 1 if YouPlot.run_as_executable?
-
-        when :barplot, :bar
-          sub_parser_add_symbol
-          sub_parser.on_head('--fmt STR', String, 'xy : header is like x, y...', 'yx : header is like y, x...') do |v|
-            options[:fmt] = v
-          end
-          sub_parser_add_xscale
-
-        when :count, :c
-          sub_parser_add_symbol
-          sub_parser_add_xscale
-
-        when :histogram, :hist
-          sub_parser_add_symbol
-          sub_parser.on_head('--closed STR', String, 'side of the intervals to be closed [left]') do |v|
-            params.closed = v
-          end
-          sub_parser.on_head('-n', '--nbins INT', Numeric, 'approximate number of bins') do |v|
-            params.nbins = v
-          end
-
-        when :lineplot, :line
-          sub_parser_add_canvas
-          sub_parser_add_grid
-          sub_parser.on_head('--fmt STR', String, 'xy : header is like x, y...', 'yx : header is like y, x...') do |v|
-            options[:fmt] = v
-          end
-          sub_parser_add_ylim
-          sub_parser_add_xlim
-
-        when :lineplots, :lines
-          sub_parser_add_canvas
-          sub_parser_add_grid
-          sub_parser.on_head('--fmt STR', String, 'xyxy : header is like x1, y1, x2, y2, x3, y3...',
-                             'xyy  : header is like x, y1, y2, y2, y3...') do |v|
-            options[:fmt] = v
-          end
-          sub_parser_add_ylim
-          sub_parser_add_xlim
-
-        when :scatter, :s
-          sub_parser_add_canvas
-          sub_parser_add_grid
-          sub_parser.on_head('--fmt STR', String, 'xyxy : header is like x1, y1, x2, y2, x3, y3...',
-                             'xyy  : header is like x, y1, y2, y2, y3...') do |v|
-            options[:fmt] = v
-          end
-          sub_parser_add_ylim
-          sub_parser_add_xlim
-
-        when :density, :d
-          sub_parser_add_canvas
-          sub_parser_add_grid
-          sub_parser.on('--fmt STR', String, 'xyxy : header is like x1, y1, x2, y2, x3, y3...',
-                        'xyy  : header is like x, y1, y2, y2, y3...') do |v|
-            options[:fmt] = v
-          end
-          sub_parser_add_ylim
-          sub_parser_add_xlim
-
-        when :boxplot, :box
-          sub_parser_add_xlim
-
-        when :colors, :color, :colours, :colour
-          sub_parser.on_head('-n', '--names', 'show color names only', TrueClass) do |v|
-            options[:color_names] = v
-          end
-
-        else
-          error_message = "uplot: unrecognized command '#{command}'"
-          if YouPlot.run_as_executable?
-            warn error_message
-            exit 1
-          else
-            raise Error, error_message
-          end
-        end
-      end
-
-      def parse_options(argv = ARGV)
-        begin
-          create_main_parser.order!(argv)
-        rescue OptionParser::ParseError => e
-          warn "uplot: #{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 "uplot: #{e.message}"
-          exit 1 if YouPlot.run_as_executable?
-        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

@@ -3,41 +3,49 @@
 require 'csv'
 
 module YouPlot
-  # Read and interpret Delimiter-separated values format file or stream.
+  # Module to handle DSV (Delimiter-separated values) format.
+  # Extract header and series.
   module DSV
     module_function
 
     def parse(input, delimiter, headers, transpose)
-      arr = parse_as_csv(input, delimiter)
+      # Parse as CSV
-      headers = get_headers(arr, headers, transpose)
+      arr = CSV.parse(input, col_sep: delimiter)
-      series = get_series(arr, headers, transpose)
+
-      if headers.nil?
+      # Remove blank lines
-        Data.new(headers, series)
+      arr.delete_if do |i|
-      else
+        i == [] or i.all?(&:nil?)
-        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
+
+      # 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
+
-          Data.new(headers, series)
+      if h_size > s_size
-        elsif 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
-      end
-    end
 
-    def parse_as_csv(input, delimiter)
+      Data.new(headers, series) if h_size == s_size
-      CSV.parse(input, col_sep: delimiter)
-         .delete_if do |i|
-           i == [] or i.all? nil
-         end
     end
 
     # Transpose different sized ruby arrays
@@ -47,31 +55,33 @@ module YouPlot
     end
 
     def get_headers(arr, headers, transpose)
-      if headers
+      # header(-)
-        if transpose
+      return nil unless headers
-          arr.map(&:first)
+
-        else
+      # header(+) trenspose(+)
+      return arr.map(&:first) if transpose
+
+      # header(+) transpose(-)
       arr[0]
     end
-      end
-    end
 
     def get_series(arr, headers, transpose)
-      if headers
+      # header(-)
-        if arr.size > 1
+      unless headers
-          if transpose
+        return arr if transpose
-            arr.map { |row| row[1..-1] }
+
-          else
+        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
-        else
-          Array.new(arr[0].size, [])
-        end
-      elsif transpose
-        arr
-      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 = '0.3.5'
+  VERSION = '0.4.6'
 end

test/fixtures/iris-count.txt

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

@@ -2,7 +2,7 @@
 
 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]))

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/iris_test.rb

@@ -28,25 +28,23 @@ class YouPlotIRISTest < 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 YouPlotIRISTest < 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 YouPlotIRISTest < 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 YouPlotIRISTest < 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 YouPlotIRISTest < 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 +116,25 @@ class YouPlotIRISTest < Test::Unit::TestCase
     assert_equal fixture('iris-boxplot.txt'), @stderr_file.read
   end
 
-  # test :c do
+  test :box do
-  #   YouPlot::Command.new(['count', '-H', '-d,']).run
+    YouPlot::Command.new(['box', '-H', '-d,', '-t', 'IRIS-BOXPLOT']).run
-  #   assert_equal fixture('iris-count.txt'), @stderr_file.read
+    assert_equal fixture('iris-boxplot.txt'), @stderr_file.read
-  # end
+  end
 
-  # test :count do
+  # Yeah, lineplot/lineplots don't make sense too.
-  #   YouPlot::Command.new(['c', '-H', '-d,']).run
+  # Just checking the behavior.
-  #   assert_equal fixture('iris-count.txt'), @stderr_file.read
+
-  # end
+  test :c do
+    YouPlot::Command.new(['count', '-H', '-d,']).run
+    assert_equal fixture('iris-count.txt'), @stderr_file.read
+  end
+
+  test :count do
+    YouPlot::Command.new(['c', '-H', '-d,']).run
+    assert_equal fixture('iris-count.txt'), @stderr_file.read
+  end
+
+  # Output options.
 
   test :plot_output_stdout do
     YouPlot::Command.new(['bar', '-o', '-H', '-d,', '-t', 'IRIS-BARPLOT']).run
@@ -141,7 +163,7 @@ class YouPlotIRISTest < Test::Unit::TestCase
   end
 
   test :unrecognized_command do
-    assert_raise(YouPlot::Command::Parser::Error) do
+    assert_raise(YouPlot::Parser::Error) do
       YouPlot::Command.new(['abracadabra', '--hadley', '--wickham']).run
     end
     assert_equal '', @stderr_file.read

test/youplot/simple_test.rb

@@ -28,22 +28,31 @@ class YouPlotSimpleTest < Test::Unit::TestCase
 
   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 :barplot do
+  test :histogram do
-    assert_raise(ArgumentError) do
+    YouPlot::Command.new(['histogram']).run
-      YouPlot::Command.new(['barplot']).run
+    assert_equal fixture('simple-histogram.txt'), @stderr_file.read
-    end
   end
 
   test :hist do
@@ -51,9 +60,9 @@ class YouPlotSimpleTest < Test::Unit::TestCase
     assert_equal fixture('simple-histogram.txt'), @stderr_file.read
   end
 
-  test :histogram do
+  test :lineplot do
-    YouPlot::Command.new(['histogram']).run
+    YouPlot::Command.new(['lineplot']).run
-    assert_equal fixture('simple-histogram.txt'), @stderr_file.read
+    assert_equal fixture('simple-lineplot.txt'), @stderr_file.read
   end
 
   test :line do
@@ -61,50 +70,40 @@ class YouPlotSimpleTest < Test::Unit::TestCase
     assert_equal fixture('simple-lineplot.txt'), @stderr_file.read
   end
 
-  test :lineplot do
-    YouPlot::Command.new(['lineplot']).run
-    assert_equal fixture('simple-lineplot.txt'), @stderr_file.read
-  end
-
-  test :lines do
-    assert_raise(YouPlot::Backends::UnicodePlotBackend::Error) do
-      YouPlot::Command.new(['lines']).run
-    end
-  end
-
   test :lineplots do
-    assert_raise(YouPlot::Backends::UnicodePlotBackend::Error) do
+    assert_raise(YouPlot::Backends::UnicodePlot::Error) do
       YouPlot::Command.new(['lineplots']).run
     end
   end
 
-  test :s do
+  test :lines do
-    assert_raise(YouPlot::Backends::UnicodePlotBackend::Error) do
+    assert_raise(YouPlot::Backends::UnicodePlot::Error) do
-      YouPlot::Command.new(['s']).run
+      YouPlot::Command.new(['lines']).run
     end
   end
 
   test :scatter do
-    assert_raise(YouPlot::Backends::UnicodePlotBackend::Error) do
+    assert_raise(YouPlot::Backends::UnicodePlot::Error) do
       YouPlot::Command.new(['scatter']).run
     end
   end
 
-  test :d do
+  test :s do
-    assert_raise(YouPlot::Backends::UnicodePlotBackend::Error) do
+    assert_raise(YouPlot::Backends::UnicodePlot::Error) do
-      YouPlot::Command.new(['d']).run
+      YouPlot::Command.new(['s']).run
     end
   end
 
   test :density do
-    assert_raise(YouPlot::Backends::UnicodePlotBackend::Error) do
+    assert_raise(YouPlot::Backends::UnicodePlot::Error) do
       YouPlot::Command.new(['density']).run
     end
   end
 
-  test :box do
+  test :d do
-    YouPlot::Command.new(['box']).run
+    assert_raise(YouPlot::Backends::UnicodePlot::Error) do
-    assert_equal fixture('simple-boxplot.txt'), @stderr_file.read
+      YouPlot::Command.new(['d']).run
+    end
   end
 
   test :boxplot do
@@ -112,17 +111,20 @@ class YouPlotSimpleTest < Test::Unit::TestCase
     assert_equal fixture('simple-boxplot.txt'), @stderr_file.read
   end
 
-  # test :c do
+  test :box do
-  #   omit
+    YouPlot::Command.new(['box']).run
-  #   YouPlot::Command.new(['count', '-H', '-d,']).run
+    assert_equal fixture('simple-boxplot.txt'), @stderr_file.read
-  #   assert_equal fixture('iris-count.txt'), @stderr_file.read
+  end
-  # end
 
-  # test :count do
+  test :count do
-  #   omit
+    YouPlot::Command.new(['c']).run
-  #   YouPlot::Command.new(['c', '-H', '-d,']).run
+    assert_equal fixture('simple-count.txt'), @stderr_file.read
-  #   assert_equal fixture('iris-count.txt'), @stderr_file.read
+  end
-  # 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
@@ -153,21 +155,11 @@ class YouPlotSimpleTest < Test::Unit::TestCase
     assert_equal fixture('simple-lineplot-xlabel.txt'), @stderr_file.read
   end
 
-  test :line_x do
-    YouPlot::Command.new(['line', '-x', 'X-LABEL']).run
-    assert_equal fixture('simple-lineplot-xlabel.txt'), @stderr_file.read
-  end
-
   test :line_ylabel do
     YouPlot::Command.new(['line', '--ylabel', 'Y-LABEL']).run
     assert_equal fixture('simple-lineplot-ylabel.txt'), @stderr_file.read
   end
 
-  test :line_y do
-    YouPlot::Command.new(['line', '-y', 'Y-LABEL']).run
-    assert_equal fixture('simple-lineplot-ylabel.txt'), @stderr_file.read
-  end
-
   test :line_width do
     YouPlot::Command.new(['line', '--width', '17']).run
     assert_equal fixture('simple-lineplot-width-17.txt'), @stderr_file.read

youplot.gemspec

@@ -10,19 +10,15 @@ Gem::Specification.new do |spec|
 
   spec.summary       = 'A command line tool for Unicode Plotting'
   spec.description   = 'A command line tool for Unicode Plotting'
-  spec.homepage      = 'https://github.com/kojix2/youplot'
+  spec.homepage      = 'https://github.com/red-data-tools/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   = %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