Data.Format

Documentation

fmt :: QuasiQuoter

Quasi Quoter for format strings. Examples:

Examples:

>>> let answer = 42 in [fmt|What is the answer to universe, life and everything? It's $answer!|]
"What is the answer to universe, life and everything? It's 42!"

>>> let toggle = True in [fmt|The toggle is switched ${if toggle then ("on" :: Text) else "off"}|]
"The toggle is switched on"

>>> let timeDelta = 60 in [fmt|Request latency: ${timeDelta}ms|]
"Request latency: 60ms"

fmtConcat :: [Text] -> Text

This is just specialized mconcat, reexported under a specialized name in order to avoid namespace clashes.

class Format a where

Type class which needs to be implemented by types that should be usable for format string interpolation. For most types the this class is simply implemented in terms of show. But for human-readable strings (e.g. String, Text), the format representation is simply the string itself, not its show-image (which adds quotation characters).

Minimal complete definition

formatText

Methods

formatText :: a -> Text

Instances

Format Bool

Methods

formatText :: Bool -> Text

Format Double

Methods

formatText :: Double -> Text

Format Float

Methods

formatText :: Float -> Text

Format Int

Methods

formatText :: Int -> Text

Format Integer

Methods

formatText :: Integer -> Text

Format String

Methods

formatText :: String -> Text

Format SomeException

Methods

formatText :: SomeException -> Text

Format Text

Methods

formatText :: Text -> Text

Format Text

Methods

formatText :: Text -> Text