Re: [Haskell-cafe] How can I use ghci more wisely?

You might like to know about this option for ghci -interactive-print I tested it with data-pprint though and it didn't work because it returns an IO Doc instead of IO () (I assume). But if you wrote a function that used that, returned the right type, cabal installed it and put it in your .ghci, you would have your pprinting by default whenever you use ghci. On Wed, Jul 24, 2013 at 7:33 AM, Jun Inoue wrote:

The data-pprint package's pprint function might give you a quick fix. For example:

Prelude> :m Data.PPrint Prelude Data.PPrint> pprint [1..] [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, …, ……] Prelude Data.PPrint> let long_computation = long_computation Prelude Data.PPrint> pprint [1, long_computation, 3] [1, ⊥₁, 3] ⊥₁: timeout at 0%

It's a bit of a hassle to have to type "pprint" all the time though, and it doesn't give you a way to show the data without printing to the terminal in the IO monad.

On Wed, Jul 24, 2013 at 4:30 AM, yi lu wrote:

...

I am wondering how can I ask ghci to show an infinite list wisely. When I type

fst ([1..],[1..10])

The result is what as you may guess

1,2,3,4,...(continues to show, cut now)

How could I may ghci show

[1..]

this wise way not the long long long list itself?

Yi

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-- Jun Inoue

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