Kor(Knights Of Round) is a pluggable table data converter.

+----------+    +-----+    +----------+
|   csv    | => |     | => |   csv    |
+----------+    |     |    +----------+
+----------+    |     |    +----------+
|   tsv    | => | kor | => |   tsv    |
+----------+    |     |    +----------+
+----------+    |     |    +----------+
| markdown | => |     | => | markdown |
+----------+    +-----+    +----------+

$ cat table.csv
from \ to,markdown,csv,tsv
markdown,ok,ok,ok
csv,ok,ok,ok
tsv,ok,ok,ok

$ kor csv markdown < table.csv
| from \ to | markdown | csv | tsv |
| --- | --- | --- | --- |
| markdown | ok | ok | ok |
| csv | ok | ok | ok |
| tsv | ok | ok | ok |

$ kor csv tsv < table.csv
from \ to	markdown	csv	tsv
markdown	ok	ok	ok
csv	ok	ok	ok
tsv	ok	ok	ok

$ kor csv csv < table.csv
from \ to,markdown,csv,tsv
markdown,ok,ok,ok
csv,ok,ok,ok
tsv,ok,ok,ok

Kor have command line interface.

Input from stdin and output to stdout.

$ kor
kor [option] [input-plugin] [input-option] [output-plugin] [output-option]
example:
  $ kor --sync csv markdown --strip

Input plugin name. If you set name that require "kor/input/name" And call Kor::Input::Name.new By default, you can use csv,tsv,markdown.

input-plugin have distinctive option. Should be start - and join key and value with = like --key=value.

Output plugin name. If you set name that require "kor/output/name" And call Kor::Output::Name.new By default, you can use csv,tsv,markdown.

output-plugin have distinctive option. Should be start - and join key and value with = like --key=value.

Kor have plugin system.

You can extend input and output support format.

Embed format is that input csv,tsv,markdown and output csv,tsv,markdown

Plugin just only write class of Ruby.

And input and output run sequential processing like this.

out_obj.head(in_obj.head)
while body = in_obj.gets
  out_obj.puts(body)
end
out_obj.finish

• https://github.com/ksss/kor-input-json
• https://github.com/ksss/kor-output-json
• https://github.com/ksss/kor-input-ltsv
• https://github.com/ksss/kor-output-ltsv
• https://github.com/ksss/kor-input-yaml
• https://github.com/ksss/kor-output-yaml

Input plugin read data by I/O and make data of keys and values.

keys read by head method.

values read by gets method.

gets method should be designed to read only one line.

This is an example for Coron separated values table.

module Kor
  module Input
    class Coronsv < Base
      # head method should be return Array of key name
      def head
        # io is input IO object (default $stdin)
        io.gets.split(':').map(&:strip)
      end

      # gets method should be return Array of values or nil
      # Stop read loop when return nil
      def gets
        if line = io.gets
          line.chomp.split(':').map(&:strip)
        else
          nil
        end
      end
    end
  end
end

Output plugin write data to I/O from input keys and values.

keys write by head method.

values write by puts method.

puts method should be designed to write only one line.

This is and example for Coron separated values table.

module Kor
  module Output
    class Coronsv < Base
      # You can set cli option.
      # $ kor [input-plugin] coronsv --hello=world
      # Hello, world
      def parse(opt)
        opt.on("--hello") do |arg|
          io.puts "Hello, #{arg}"
        end
      end

      # At first, run `head` method with `keys`
      # keys is object of returned by input-plugin `head` method.
      # `head` should be print output string to I/O.
      def head(keys)
        # `io` is output I/O object (default $stdout)
        io.puts keys.join(':')
      end

      # `puts` method each call by input-plugin `gets`.
      # values is object of returned by input-plugin `gets` method.
      # `puts` should be print output string to I/O
      def puts(values)
        io.puts values.join(':')
      end
    end
  end
end

But in most cases separated values table can make from sed command like this

$ kor markdown csv < table.md | sed 's/,/:/g'
from \ to:markdown:csv:tsv
markdown:ok:ok:ok
csv:ok:ok:ok
tsv:ok:ok:ok

Add this line to your application's Gemfile:

gem 'kor'

And then execute:

$ bundle

Or install it yourself as:

$ gem install kor

Bug reports and pull requests are welcome on GitHub at https://github.com/ksss/kor. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

The gem is available as open source under the terms of the MIT License.