Convert a Markdown document or text into a terminal friendly output.

TTY::Markdown provides a Markdown processing component for the TTY Toolkit.

Add this line to your application's Gemfile:

gem "tty-markdown"

And then execute:

$ bundle

Or install it yourself as:

$ gem install tty-markdown

• 1. Usage
  • 1.1 Header
  • 1.2 List
  • 1.3 Definition List
  • 1.4 Link
  • 1.5 Blockquote
  • 1.6 Code and Syntax Highlighting
  • 1.7 Table
  • 1.8 Horizontal Rule
  • 1.9 Footnotes
• 2. Options
  • 2.1 :mode
  • 2.2 :theme
  • 2.3 :width
  • 2.4 :symbols
  • 2.5 :indent
  • 2.6 :color
• 3. Command line tool

Using parse method, you can transform a Markdown string into a terminal formatted content:

parsed = TTY::Markdown.parse("# Hello")
puts parsed
# => "\e[36;1mHello\e[0m\n"

The parse_file allows you to transform a Markdown document into a terminal formatted output:

parsed = TTY::Markdown.parse_file('example.md')
puts parsed

Parsing the following Markdown headers:

TTY::Markdown
=============

**tty-markdown** converts markdown document into a terminal friendly output.

## Examples

### Nested list items

The terminal output looks like this:

Both numbered and unordered lists are supported. Given a Markdown:

- Item 1
  - Item 2
  - Item 3
    - Item 4
- Item 5

The parsed output looks like this:

Given a definition list:

Item 1
: This is the description for Item 1

Item 2
: This is the description for Item 2
: This is another description for Item 2

The parsed output looks like this:

A Markdown link:

[An inline-style link](https://ttytoolkit.org)

[An inline-style link with title](https://ttytoolkit.org "TTY Toolkit Homepage")

The link text will be rendered with the link next to it:

Given a Markdown quote:

> Blockquotes are very handy in email to emulate reply text.
> This line is part of the same quote.
> *Oh*, you can put **Markdown** into a blockquote.

The rendered output looks like this:

The parser can highlight syntax of many programming languages.

Given a Markdown codeblock with a language specification:

```ruby
class Greeter
  def hello(name)
    puts "Hello #{name}"
  end
end
```

The terminal output will look like this:

You can transform tables which understand the Markdown alignment.

For example, given the following table:

| Tables   |      Are      |  Cool |
|----------|:-------------:|------:|
| col 1 is |  left-aligned | $1600 |
| col 2 is |    centered   |   $12 |
| col 3 is | right-aligned |    $1 |

Then the terminal output will look like this:

You can specify a horizontal rule in Markdown:

***

and then transform it:

parsed = TTY::Markdown.parse(markdown_string)

puts parsed will output:

You can create footnote references:

It is not down on any map[^foo]; true places[^bar] never are.

[^foo]: A diagrammatic representation of an area of land or sea.
[^bar]: A particular position, point, or area in space; a location.

All footnotes will be displayed with a sequential number and rendered in the terminal like this:

By default the 256 color scheme is used to render code block elements.

Use the :mode keyword to specify the maximum number of colors, for example, to be 16 ANSI colors:

TTY::Markdown.parse(markdown_string, mode: 16)

This feature may be handy when working in terminals with limited color support.

By default, TTY::Markdown detects terminal color mode and adjusts output automatically.

Use the :theme keyword to change specific Markdown element styles.

For example, to override styles for the link and list elements do:

TTY::Markdown.parse(markdown_string, theme: {link: :magenta, list: %i[magenta bold]})

Here's a complete list of element names with corresponding styles:

Read the pastel documentation for all supported styles.

Use the :width keyword to control the maximum width of the output:

TTY::Markdown.parse(markdown_string, width: 80)

By default the terminal screen width is used.

By default, formatted output includes various Unicode symbols. Use the :symbols keyword to switch to an ASCII set and/or override individual symbols.

TTY::Markdown.parse(markdown_string, symbols: :ascii)
TTY::Markdown.parse(markdown_string, symbols: {base: :ascii})
TTY::Markdown.parse(markdown_string, symbols: {override: {bullet: "x"}})

Here's a complete list of symbol names with corresponding ASCII and Unicode characters:

By default, any content apart from the main h1 header is indented with 2 spaces. Use the :indent keyword to provide custom indent or no indent at all:

TTY::Markdown.parse(markdown_string, indent: 0)

Use the :color keyword to control when to apply coloring to various document elements. Valid values are :always, :auto or :never. The default :auto value automatically detects whether to color the output or not.

For example, to always color content regardless of terminal support:

TTY::Markdown.parse(markdown_string, color: :always)

Install the tty-markdown-cli to use the tty-markdown executable in the terminal:

$ tty-markdown README.md

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

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

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

Everyone interacting in the TTY::Markdown project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.

Copyright (c) 2018 Piotr Murach. See LICENSE.txt for further details.