Ronn-NG

Ronn-NG is a new, currently-maintained fork of the defunct original Ronn project.

Ronn builds manuals. It converts simple, human readable textfiles to roff for terminal display, and also to HTML for the web.

The source format includes all of Markdown but has a more rigid structure and syntax extensions for features commonly found in manpages (definition lists, link notation, etc.). The ronn-format(7) man page defines the format in detail.

The *.ronn files found in the man/ directory show off a wide range of ronn capabilities:

ronn(1) command – source file, roff output
ronn-format(7) file format – source file, roff output

As an alternative, you might want to check out pandoc which can also convert markdown into roff manual pages.

Installation

Install with Homebrew on macOS:

brew tap apjanke/ronn-ng
brew install ronn-ng

Install with gem anywhere that supports it:

gem install ronn-ng

See INSTALLING.md for details on other systems and installation methods.

Examples

Build roff and HTML output files for one or more input files:

$ ronn man/ronn.5.ronn
roff: man/ronn.5
html: man/ronn.5.html

Generate only a standalone HTML version of one or more files:

$ ronn --html man/markdown.5.ronn
html: man/markdown.5.html

Build roff versions of all ronn files in a directory:

$ ronn --roff man/*.ronn

View a ronn file as if it were a manpage without building intermediate files:

$ ronn --man man/markdown.5.ronn

View roff output with man(1):

$ man man/ronn.5

The ronn(1) man page includes comprehensive documentation on ronn command line options.

Background

Some think Unix man pages are a poor and outdated form of documentation. Ronn-NG disagrees:

Manpages follow a well defined structure that's immediately familiar. This gives developers a starting point when documenting new tools, libraries, and formats.
Manpages get to the point. Because they're written in an inverted style, with a SYNOPSIS section followed by additional detail, prose and references to other sources of information, manpages provide the best of both cheat sheet and reference style documentation.
Historically, manpages use an extremely — unbelievably — limited set of text formatting capabilities. You get a couple of headings, lists, bold, underline and no more. This is a feature.
Although two levels of section hierarchy are technically supported, most manpages use only a single level. Unwieldy document hierarchies complicate otherwise good documentation. Remember that Feynman covered all of physics — heavenly bodies through QED — with only two levels of document hierarchy (The Feynman Lectures on Physics, 1970).
The classical terminal manpage display is typographically well thought out. Big bold section headings, justified monospace text, nicely indented paragraphs, intelligently aligned definition lists, and an informational header and footer.
Manpages have a simple referencing syntax; e.g., sh(1), fork(2), markdown(7). HTML versions can use this to generate links between pages.

Unfortunately, figuring out how to create a manpage is a fairly tedious process. The roff/mandoc/mdoc macro languages are highly extensible, fractured between multiple dialects, and include a bunch of device-specific stuff irrelevant to modern publishing tools. Ronn aims to solve that problem.

Requirements

Ronn-NG requires Ruby 2.4 or newer.

Ruby 3.x support is a work in progress as of Ronn-NG 0.10.1 (December 2022).

If you are installing Ronn-NG as a standalone program (the usual way to use it), it includes all its Ruby libraries, and has no other dependencies. If you are using Ronn-NG as a gem or other library, it requires gems as listed in ronn-ng.gemspec.

Project Management

The project home page is at https://github.com/apjanke/ronn-ng. Bug reports, feature requests, and patch submissions are welcome.

Ronn-NG was forked from the original Ronn project in 2018 after Ronn development had been defunct for a couple years, and Andrew wanted some bugs fixed.