Re: [NTG-context] buffers (append)
Hi Alan,
>> > In addition to \startbuffer \stopbuffer
>> > it would be nice to have \startappendbuffer \stopappendbuffer.
>> >
>> > I see that the lua function buffer.append() exists but I have not
>> > worked-out how to add this functionality cleanly as conTeXt macros.
Here you go!
% We want to join appended pieces with a newline
% but '\n' is a bit rotten to pass inside \ctxlua
% so we simply prepare the appending function inside \startluacode, instead
\startluacode
userdata = userdata or { }
function userdata.addTempToBuffer(buffername)
buffers.append(
buffername,
'\n' .. buffers.getcontent('APPENDTEMP')
)
end
\stopluacode
\def\startappendbuffer[#1]%
{% 1: create a \stopappendbuffer that appends APPENDTEMP to the buffer #1
\def\stopappendbuffer%
{\ctxlua{userdata.addTempToBuffer('#1')}}
% 2: write the buffer to APPENDTEMP instead of overwriting buffer #1
% then addTempToBuffer will take care of the appending.
\dostartbuffer[APPENDTEMP][startappendbuffer][stopappendbuffer]}
%%% --- And here is an example --- %%%
%%% --- With my respects to Dorothy L. Sayers --- %%%
\setuplayout[backspace=6cm, leftmargin=5cm, width=11cm]
\showframe
\starttext
\startbuffer[x]
\inmargin{Harriet Vane}
Here then at home, by no more storms distrest,
Folding laborious hands we sit, wings furled;
Here in close perfume lies the rose-leaf curled,
Here the sun stands and knows not east nor west,
Here no tide runs; we have come, last and best,
>From the wide zone through dizzying circles hurled,
To that still centre where the spinning world
Sleeps on its axis, to the heart of rest.
\stopbuffer
\startlines
\getbuffer[x]
\stoplines
--
\startappendbuffer[x]
\inmargin{Lord Peter Wimsey}
Lay on thy whips, O Love, that we upright,
Poised on the perilous point, in no lax bed
May sleep, as tension at the verberant core
Of music sleeps; for, if thou spare to smite,
Staggering, we stoop, stooping, fall dumb and dead,
And, dying so, sleep our sweet sleep no more.
\stopappendbuffer
\startlines
\getbuffer[x]
\stoplines
--
\typebuffer[x]
\stoptext
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___
Re: [NTG-context] buffers (append)
On Mon, 14 Jan 2013 09:34:08 +0100 Wolfgang Schuster wrote: > > Am 14.01.2013 um 09:00 schrieb Alan BRASLAU : > > > Hello, > > > > In addition to \startbuffer \stopbuffer > > it would be nice to have \startappendbuffer \stopappendbuffer. > > > > I see that the lua function buffer.append() exists but I have not > > worked-out how to add this functionality cleanly as conTeXt macros. > > I imagine that this might be quite trivial for our TeX programming > > experts... (for once, a [useful?] suggestion that in the end will > > not entail many hours of work? :) > > > \startbuffer[a] > Line 1 > \stopbuffer > > \startbuffer[b] > Line 2 > \stopbuffer > > \starttext > > \startlines > \getbuffer[a,b] > \stoplines > > \stoptext > > Wolfgang Thank you Wolfgang, this is useful. However, it would still be helpful to be able to generically add to a buffer without having to rename a new one. Shouldn't be very difficult but I did not find that anything like this already exists. I often think this way when I teach, adding steps to an example while repeating the previous steps. \startbuffer[a] Line 1 \stopbuffer \getbuffer[a] \startaddtobuffer[a] Line 2 \stopaddtobuffer \getbuffer[a] Alan ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] buffers (append)
Am 14.01.2013 um 09:00 schrieb Alan BRASLAU : > Hello, > > In addition to \startbuffer \stopbuffer > it would be nice to have \startappendbuffer \stopappendbuffer. > > I see that the lua function buffer.append() exists but I have not > worked-out how to add this functionality cleanly as conTeXt macros. > I imagine that this might be quite trivial for our TeX programming > experts... (for once, a [useful?] suggestion that in the end will not > entail many hours of work? :) \startbuffer[a] Line 1 \stopbuffer \startbuffer[b] Line 2 \stopbuffer \starttext \startlines \getbuffer[a,b] \stoplines \stoptext Wolfgang ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
[NTG-context] buffers (append)
Hello, In addition to \startbuffer \stopbuffer it would be nice to have \startappendbuffer \stopappendbuffer. I see that the lua function buffer.append() exists but I have not worked-out how to add this functionality cleanly as conTeXt macros. I imagine that this might be quite trivial for our TeX programming experts... (for once, a [useful?] suggestion that in the end will not entail many hours of work? :) Alan ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
