This package provides Haskell bindings for <https://github.com/jgm/cmark libcmark>, the reference parser for <http://commonmark.org CommonMark>, a fully specified variant of Markdown. It includes sources for libcmark (0.19.0) and does not require prior installation of the C library. cmark provides the following advantages over existing Markdown libraries for Haskell: - Speed: Conversion speed is on par with the <https://hackage.haskell.org/package/sundown sundown> library. We were unable to measure precisely against <https://hackage.haskell.org/package/sundown sundown>, which raised a malloc error when compiled into our benchmark suite. Relative to other implementations: cmark was 82 times faster than <https://hackage.haskell.org/package/cheapskate cheapskate>, 59 times faster than <https://hackage.haskell.org/package/markdown markdown>, 105 times faster than <https://hackage.haskell.org/package/pandoc pandoc>, and 2.8 times faster than <https://hackage.haskell.org/package/discount discount>. - Memory footprint: Memory footprint is on par with <https://hackage.haskell.org/package/sundown sundown>. On one sample, the library uses a fourth the memory that <https://hackage.haskell.org/package/markdown markdown> uses, and less than a tenth the memory that <https://hackage.haskell.org/package/pandoc pandoc> uses. - Robustness: cmark can handle whatever is thrown at it, without the exponential blowups in parsing time one can sometimes get with other libraries. (The input @bench\/full-sample.md@, for example, causes both <https://hackage.haskell.org/package/pandoc pandoc> and <https://hackage.haskell.org/package/markdown markdown> to grind to a halt.) - Accuracy: cmark passes the CommonMark spec\'s suite of over 500 conformance tests. - Standardization: Since there is a spec and a comprehensive suite of tests, we can have a high degree of confidence that any two CommonMark implementations will behave the same. Thus, for example, one could use this library for server-side rendering and <https://github.com/jgm/commonmark.js commonmark.js> for client-side previewing. - Ease of installation: cmark is portable and has minimal dependencies. cmark does not provide Haskell versions of the whole <https://github.com/jgm/cmark libcmark> API, which is built around mutable @cmark_node@ objects. Instead, it provides functions for converting CommonMark to HTML (and other formats), and a function for converting CommonMark to a @Node@ tree that can be processed further using Haskell. A note on security: This library does not attempt to sanitize HTML output. We recommend using <https://hackage.haskell.org/package/xss-sanitize xss-sanitize> to filter the output. A note on stability: There is a good chance the API will change significantly after this early release.