[erlang-questions] Pretty printing records

Ulf Wiger <>
Thu Nov 20 21:58:56 CET 2008


But I believe the catch-all should be:

pretty_print(_, _) ->
    no.


BR,
Ulf W

2008/11/20 Vance Shipley <>:
> On Thu, Nov 20, 2008 at 05:44:26PM +0100, Ulf Wiger wrote:
> }  You can use the same function as the shell, namely:
> }
> }  io_lib_pretty:print(Term, RecDefFun)
>
> That is indeed what I was looking for.  The result is a deep
> list which when printed using the '~s' control sequence in
> io:fwrite/2 (or in my case ct:log/2) gets output nicely.
>
>     ct:log("Foo = ~s", [pretty_print(Foo)])
>
> }  The RecDefFun can be somewhat generalized through use of
> }  the exprecs parse transform.
>
> I just used a local fun with the records I was interested in
> seeing:
>
>     pretty_print(Record) ->
>          io_lib_pretty:print(Record, fun pretty_print/2).
>
>     pretty_print(foo, N) ->
>          N = record_info(size, foo) - 1,
>          record_info(fields, foo);
>     pretty_print(bar, N) ->
>          N = record_info(size, bar) - 1,
>          record_info(fields, bar);
>     pretty_print(_, _) ->
>          [].
>
> Thanks,
>
>        -Vance
>



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