Re: Possible to use format/2 to print a table with right-justified columns?

[emacstheviking]

rpad(S, W, Chr, Out) :-

    length(S, L),

    Pad is W - L,

    format_to_codes(Out, '~*c~s', [Pad, Chr, S]).

Works for me!

:)
Sean

On 21 August 2014 13:56, emacstheviking <address@hidden> wrote:

Forgot to add that I would write a small predicate to then calculate the length of the string from the padding and actually make the number of spaces ensure right justification blah blah yadda yadda but I am sure you got that anyway!

:)

Perhaps I should do it for myself anyway!

On 21 August 2014 13:53, emacstheviking <address@hidden> wrote:

Best I managed was this:

yes

| ?- format('~*c~s',[10,32,"Hello"]).

format('~*c~s',[10,32,"Hello"]).

          Hello

yes

| ?- format('~*c~s',[20,32,"Hello"]).

format('~*c~s',[20,32,"Hello"]).

                    Hello

VALUE would be replaced with whatever you want to print at that point, probably another format specifier. By using * you can alter the width and the 'c' (with 32) allows spaces to be used as the pad.

Thanks,

Sean.

On 21 August 2014 12:19, Paulo Moura <address@hidden> wrote:

Hi,

Is it possible to use GNU Prolog format/2 predicate to print a table with right-justified columns? The original Quintus Prolog implementation of this predicate provide format control sequences to set and align with tab stops but this seems to not be implemented in GNU Prolog. Is there any alternative usage of the format/2 predicate that I'm missing?

Cheers,

Paulo

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Paulo Moura
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