On 11/13/20 10:47 AM, G. Branden Robinson wrote:
> At 2020-11-13T10:00:20+0100, Michael Kerrisk (man-pages) wrote:
>> But in the "-branden" version I see
>>
>> [[
>> .RS 6n
>> ]]
>
> Yes.
>
>> If I understand correctly, then that number is calculated based on the
>> ".IP * 2" that precedes it.
>
> Yes.
>
>> That doesn't seem good (since, maybe at some point, one might want to
>> change the .IP yo say ".IP 1) 3", and then one has to fix the .RS
>> lines. Am I missing something?
>
> No. This is why I don't have a solution for you yet. The problem
> facing us is to set a code display (.EX/.EE) with the the following
> constraints.
>
> A. It must be indented from its context by a predictable amount
> irrespective of that context being an indented paragraph (.IP).
> B. Indented paragraphs must be free to use custom indentation amounts.
> C. The quantity of macro calls must be minimal. (Probably 2: one to
> commence the indenation and one to cancel it.)
> D. We want to use standard man(7) macros, not raw *roff requests.
> E. The solution should be portable to non-groff interpreters, ruling out
> computation of indentation using internal variables specific to
> groff's man(7) implementation to figure out the current indentation
> amount.
>
> So far I've only been able to come up with solutions if any one of (A),
> (B), or (C) is relaxed.
>
> Please correct me if I've overstated of any of these constraints, or
> omitted one.
That seems a fair summary. I might add the following *preferences*
for a solution as well:
(f) Solution can be applied consistently throughout the corpus.
(g) Don't inject too much unneeded white space in the rendered
output. (e.g. .TP/.RS/.RE forces a newline which may not
be desirable in all cases.
Our current solution relaxes constraint D (i.e., we use ".in").
It certainly looks like there's no way to solve the problem
without relaxing one of the constraint.
Thanks, as ever, for your input Branden.
Cheers,
Michael
--
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/
