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Lua library for conversion between markup formats

branch: master
README.markdown

Lunamark

Lunamark is a lua library and command-line program for conversion of markdown to other textual formats. Currently HTML, dzslides, Docbook, ConTeXt, LaTeX, and Groff man are the supported output formats, but it is easy to add new writers or modify existing ones. The markdown parser is written using a PEG grammar and can also be modified by the user.

The library is as portable as lua and has very good performance. It is roughly as fast as the author's own C library peg-markdown, two orders of magnitude faster than Markdown.pl, and three orders of magnitude faster than markdown.lua.

Links

Extensions

Lunamark's markdown parser currently supports a number of extensions (which can be turned on or off individually), including:

  • Smart typography (fancy quotes, dashes, ellipses)
  • Significant start numbers in ordered lists
  • Footnotes
  • Definition lists
  • Pandoc-style title blocks
  • Flexible metadata using lua declarations

See the lunamark(1) man page for a complete list.

It is very easy to extend the library by modifying the writers, adding new writers, and even modifying the markdown parser. Some simple examples are given in the API documentation.

Benchmarks

Generated with

PROG=$program make bench

This converts the input files from the original markdown test suite concatenated together 25 times.

     0.04s   sundown
     0.15s   discount
->   0.56s   lunamark + luajit
     0.80s   peg-markdown
->   0.97s   lunamark
     4.05s   PHP Markdown
     6.11s   pandoc
   113.13s   Markdown.pl
  2322.33s   markdown.lua

Installing

If you want a standalone version of lunamark that doesn't depend on lua or other lua modules being installed on your system, just do

make standalone

Your executable will be created in the standalone directory.

If you are a lua user, you will probably prefer to install lunamark using luarocks. You can install the latest development version this way:

git clone http://github.com/jgm/lunamark.git
cd lunamark
luarocks make

Released versions will be uploaded to the luarocks repository, so you should be able to install them using:

luarocks install lunamark

There may be a short delay between the release and the luarocks upload.

Using the library

Simple usage example:

local lunamark = require("lunamark")
local opts = { }
local writer = lunamark.writer.html.new(opts)
local parse = lunamark.reader.markdown.new(writer, opts)
print(parse("Here's my *text*"))

For more examples, see API documentation.

lunamark

The lunamark executable allows easy markdown conversion from the command line. For usage instructions, see the lunamark(1) man page.

lunadoc

Lunamark comes with a simple lua library documentation tool, lunadoc. For usage instructions, see the lunadoc(1) man page. lunadoc reads source files and parses specially marked markdown comment blocks. Here is an example of the result.

Tests

The source directory contains a large test suite in tests. This includes existing Markdown and PHP Markdown tests, plus more tests for lunamark-specific features and additional corner cases.

To run the tests, use bin/shtest.

bin/shtest --help            # get usage
bin/shtest                   # run all tests
bin/shtest indent            # run all tests matching "indent"
bin/shtest -p Markdown.pl -t # run all tests using Markdown.pl, and normalize using 'tidy'

Lunamark currently fails four of the PHP Markdown tests:

  • tests/PHP_Markdown/Quotes in attributes.test: The HTML is semantically equivalent; using the -t/--tidy option to bin/shtest makes the test pass.

  • tests/PHP_Markdown/Email auto links.test: The HTML is semantically equivalent. PHP markdown does entity obfuscation, and lunamark does not. This feature could be added easily enough, but the test would still fail, because the obfuscation involves randomness. Again, using the -t/--tidy option makes the test pass.

  • tests/PHP_Markdown/Ins & del.test: PHP markdown puts extra <p> tags around <ins>hello</ins>, while lunamark does not. It's hard to tell from the markdown spec which behavior is correct.

  • tests/PHP_Markdown/Emphasis.test: A bunch of corner cases with nested strong and emphasized text. These corner cases are left undecided by the markdown spec, so in my view the PHP test suite is not normative here; I think lunamark's behavior is perfectly reasonable, and I see no reason to change.

Authors

lunamark is released under the MIT license.

Most of the library is written by John MacFarlane. Hans Hagen made some major performance improvements. Khaled Hosny added the original ConTeXt writer.

The dzslides HTML, CSS, and javascript code is by Paul Rouget, released under the DWTFYWT Public License.

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