[erlang-questions] Erlang term to ASCII

Brandon Clark <>
Fri Feb 7 23:18:28 CET 2014


Bob wins the moral victory.  Loïc wins the stuffed animal.  :-)



On Fri, Feb 7, 2014 at 11:25 AM, Loïc Hoguin <> wrote:

> Str = io_lib:format("~9999999999999999999999999p", [Data])
>
> Yep.
>
>
> On 02/07/2014 07:17 PM, Brandon Clark wrote:
>
>> I have 2 production systems, one Erlang and one not, both maintaining
>> copies of a large, deeply-nested Erlang data structure.  I need to set
>> up a monitoring script to confirm that both systems are holding
>> identical copies of the data structure.
>>
>> The non-Erlang system is holding an ASCII rendering of the data
>> structure.  Computing an MD5 sum of this string is easy.  If I can get
>> the Erlang system to convert its data structure to a string, I can have
>> it compute an MD5 sum as well and the monitoring is simply a matter of
>> comparing hashes.
>>
>> I'm stuck on the process of converting the Erlang term to a string.
>>
>> Str = io_lib:format("~p", [Data])
>>
>> gives me what I want, except that it includes newlines and indentation
>> that I can't expect the non-Erlang system to have.
>>
>> Str = io_lib:format("~w", [Data])
>>
>> eliminates the newlines and indentation but renders the textual
>> components of Data as lists of integers, guaranteeing the result won't
>> match the non-Erlang system.
>>
>> So the question is, how do I get a "~p"-style rendering of an
>> arbitrarily-large Erlang term /without/ newlines and indentation?
>>
>> Thank you!
>>
>> ~Brandon Clark
>>
>>
>>
>> _______________________________________________
>> erlang-questions mailing list
>> 
>> http://erlang.org/mailman/listinfo/erlang-questions
>>
>>
> --
> Loïc Hoguin
> http://ninenines.eu
>
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