My program has a bug I want to see within GHCi:
$ ./my-program < ./my-data
Prelude.foldl1: empty list
I tried changing stdin
or getLine
in GHCi but it doesn't seem to affect the getLine
my program uses, even if I load afterwards:
$ ghci
Prelude> import System.IO
Prelude System.IO> getLine <- fmap hGetLine $ openFile "my-data" ReadMode
:l "my-program.hs"
:main
Do I need to rewrite all my IOs to take an explicit handle to be able to test them in GHCi?
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