soostone/formattable

A business-quality formatting package with reified formats for multiple data types

formattable

A business-quality formatting package with reified formats for multiple data types

This package provides excellent support for formatting numbers including the following configurable features:

• units (thousands, millions, percent, etc)
• prefixes ($, £, etc)
• suffixes (%, ¢, etc)
• decimal separators
• thousands separators
• styles for fixed decimal notation, scientific notation, and SI prefixes
• specify precision as number of decimal places or sig figs
• different styles of negative numbers

Examples

• runFormat (intFmt { _nfStyle = SIStyle }) (225142.3 :: Double) == "225k"

See the test suite for more examples.

formattable's Issues

Release on hackage?

Could you please make one? The current one is from 2015 and pulls an old data-default-class.

behavior diverges from double-conversion

@ozataman Maybe you can weigh in here. I don't actually know what the correct behavior is here and my work on this project has been janitorial.

I've added a failing test here. If you check out with the stack branch and run stack test it should fail. This case was discovered by quickcheck. It looks like we used to depend on double-conversion but dropped the dep.

We added a quickcheck test that asserted that for all inputs we'd produce the same formatted number with our own code that we would if we used double-conversion's exponential formatter toExponential . fromMaybe (-1) and fixed formatter toFixed . fromMaybe (-1). However, it turns out double-conversion rounds up but we don't. Given the number 1.5069003e-316 we produce $1e-322% but double-conversion produces $2e-322%. I tried the exact same test but with 1.4069003e-316 and both synced up to $1e-322%, so it looks like rounding is going on. It isn't clear to me which library is right here.

Request for inclusion in stackage

https://www.stackage.org/lts-7.14/hoogle?q=formattable

enable travis

Just need the box ticket at https://travis-ci.org/profile/Soostone