Andy mentioned files, but yes, in a pipe this is true. Still, it's not
true on the REPL; I can't think of an obvious use case there, and if
there is one then having the programmer work around something like
*interactive-print-length* would be reasonable.
Note that we are talking about an infinite data structure here, not an
infinite loop. As a specific example, say we wanted to produce a
/dev/random like command, you would not achieve this by printing an
infinite random list because you'd get a "(" a the beginning which was
never closed. You'd loop. So, this would not be affected by a limit on
the size of a single data structure.
Gary Trakhman <[email protected]> writes:
> It's possible for an infinite print to be just fine, it's a streaming API
> after all, consider invoking a clojure program in the middle of some unix
> pipes.
>
>
> On Tue, Apr 1, 2014 at 12:58 PM, Phillip Lord
> <[email protected]>wrote:
>
>>
>> Of course, in this circumstances, infinitely long lists are not going to
>> behave well either.
>>
>> But, it seems to me, that this is (or should be) independent of
>> interactive use in the REPL. The current behaviour is never nice.
>> Probably, there needs to be a *interactive-print-length* var or
>> equivalent.
>>
>> Andy Fingerhut <[email protected]> writes:
>>
>> > One argument for default value of *print-length* being nil: Plenty of
>> > people print Clojure data structures to files and later read them back
>> in.
>> > The data would be corrupted if *print-length* was a too-small numeric
>> value
>> > for your particular data. It might not be obvious until much later that
>> > you have lost data.
>> >
>> > Andy
>> >
>> >
>> > On Tue, Apr 1, 2014 at 9:00 AM, Andreas Liljeqvist <[email protected]>
>> wrote:
>> >
>> >> Is there any good reason for not providing a default value for
>> >> *print-length*?
>> >> I think that if you *really* want to print a list containing 100K items,
>> >> you would have to set *print-length*.
>> >>
>> >> Basically it seems less harmful to set it to a nice value by
>> default(42?)
>> >> than possible locking up the REPL.
>> >>
>> >>
>> >> On Tue, Apr 1, 2014 at 2:49 AM, Gary Trakhman <[email protected]
>> >wrote:
>> >>
>> >>> http://clojuredocs.org/clojure_core/clojure.core/*print-length*
>> >>>
>> >>>
>> >>> On Mon, Mar 31, 2014 at 8:49 PM, Christopher Howard <
>> [email protected]
>> >>> > wrote:
>> >>>
>> >>>> Is there some kind of "safe" function for printing representations of
>> >>>> lazy, infinite data structures? I'm finding I like using them inside
>> >>>> other data structures here and there. However, when I go to play
>> >>>> around with things in the REPL, sooner or later my workflow is
>> >>>> interrupted by 3 million characters streaming across the console.
>> >>>>
>> >>>> I don't imagine there would be any way for the REPL to detect that a
>> >>>> lazy sequence was infinite. However, if it would simply refuse to
>> >>>> evaluate lazy sequence (say, represent them by some special
>> identifier)
>> >>>> that
>> >>>> would be good enough for me.
>> >>>>
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>> --
>> Phillip Lord, Phone: +44 (0) 191 222 7827
>> Lecturer in Bioinformatics, Email:
>> [email protected]
>> School of Computing Science,
>> http://homepages.cs.ncl.ac.uk/phillip.lord
>> Room 914 Claremont Tower, skype: russet_apples
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>> NE1 7RU
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Phillip Lord, Phone: +44 (0) 191 222 7827
Lecturer in Bioinformatics, Email: [email protected]
School of Computing Science,
http://homepages.cs.ncl.ac.uk/phillip.lord
Room 914 Claremont Tower, skype: russet_apples
Newcastle University, twitter: phillord
NE1 7RU
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