[9fans] plan9 ms .if h test

[pmarin.mail@gmail.com (pmarin)]

I found it.

from htmlroff(1):


"Conditional input

To make it easier to write input files that can be formatted by both
troff and htmlroff, htmlroff adds a new condition h which evaluates
true in .if and .ie requests. The t condition continues to evaluate
true, to accomodate input files trying to distinguish between troff
and nroff. To write a conditional matching troff alone, use ?.if !h
.if t?."

http://swtch.com/plan9port/man/man7/htmlroff.html

Cheers.
pmarin.


On Wed, Mar 30, 2011 at 7:12 PM, pmarin <pmarin.mail at gmail.com> wrote:
> Never mind: ".if c" is only using for built-ins.
>
> On Wed, Mar 30, 2011 at 6:55 PM, pmarin <pmarin.mail at gmail.com> wrote:
>> I searched where the register h is defined:
>>
>> % 9 grep -n '.nr h ' tmac.*
>>
>> tmac.cs:103: .nr h 6
>> tmac.cs:477: . ?nr h \\ne \}
>> tmac.mcs:208: .nr h 6
>> tmac.mcs:840: .nr h \\ne
>>
>> where h has the same meaning:
>> '''\" ? h - cover sheet basic distribution length
>>
>> Both tmac.cs and tmac.mcs load tmac.s in their inicialization so
>> probably h ?only have sense when tmac.cs or tmac.mcs are used.
>>
>> I think that if you are only using the ms macros then h is not
>> important because is not defined.
>>
>> Cheers.
>> pmarin.
>>
>>
>>
>>
>> On Wed, Mar 30, 2011 at 4:21 PM, Rudolf Sykora <rudolf.sykora at gmail.com> wrote:
>>> Hello 9fans,
>>>
>>> in the troff ms-definition file (in plan 9, p9p)
>>> /sys/lib/tmac/tmac.s
>>> I can find this structures
>>> .if h ...
>>> or
>>> .ie h ...
>>>
>>> I really can't find what this test means (the 'h'), I only know the
>>> o,e,t,n built-ins.
>>> Please, can anybody tell?
>>>
>>> [
>>> In p9p, it's e.g. on
>>> /opt/plan9/tmac/tmac.s:329 you have
>>> .ie h .ll \\n(LLu
>>> .el \{\
>>> ...
>>> ]
>>>
>>> Thank you very much!
>>> Ruda
>>>
>>>
>>
>