How can I get `ghci` to use my `show` function?

问题

Let's say you want to use your own show function (for example, let show = take 1000 . Prelude.show). How can you allow ghci to use that for printing instead of the built in show?

回答1:

You can define your own interactive print function e.g:

module BetterPrint
betterPrint a = putStrLn (take 1000 $ show a)

then start ghci as

ghci -interactive-print=BetterPrint.betterPrint

来源：https://stackoverflow.com/questions/35613612/how-can-i-get-ghci-to-use-my-show-function