Copyright © 2013 Bart Massey

XXX This package is deprecated as of 2013-09-18. The good news is that it is deprecated because it is expected to replace Text.Printf in GHC 7.8. So feel free to try it out from here, but expect to use it from there in the very near future.

This is a filled-out Haskell Text.Printf implementation enhanced to allow extending printf to new datatypes. It was originally inspired by my need for such a thing, and by finding this two-message email-list thread from May 2006 in which John Meacham and Simon Marlow suggest an implementation.

The tests are not here. Rather, they are on Github in the package printf-tests. This is because they grew into an elaborate project of their own, and are intended to work with multiple and multilingual implementations of printf().

This implementation has been enhanced to allow most of the formatting syntax of C printf(3). Text.Printf.Extensible.printf passes all of the applicable tests that glibc printf does: approximately 350 tests currently. Text.Printf.printf, on the other hand, currently fails about 150 of these tests.

This module is intended to be a 100% backward-compatible superceding implementation of Text.Printf. I hope that it will eventually replace the current Text.Printf in the GHC libraries.

This work is reasonably well-documented in Haddock, and is under a 3-clause BSD license as per Lennart Augustsson's original implementation of Text.Printf, from which most of the code was taken, and much was heavily modified.