[NTG-context] Re: Using structureuservariables before the heading
denis.ma...@unibe.ch schrieb am 12.09.2023 um 23:32:
You need a box to get the author on a separate line.
% \define[2]\ChapterCommand
% {\vbox
% {\structureuservariable{author}
% \blank
% #1\space#2}}
\starttexdefinition protected ChapterCommand #1#2
\vbox\bgroup
\structureuservariable{author}
\blank
#1\space#2
\egroup
\stoptexdefinition
Thank you so much, Wolfgang!
Why do you need protected here? I’ve realized that \protected\def also
helps a bit, but, of course, paragraph breaks are ignored there as well…
You probably haven't noticed it yet but unlike the other predefined
layouts for sections you don't have to write "alternative=command" to
use the layout which is passed to the command key.
To make this work ConTeXt has to check whether the argument of the
command key is empty or not but this is problematic when you pass
commands with arguments.
When you try to example below you can see that the first definition of
\Mycommand fails because \edef\CheckMycommand tries to expand its
argument which causes problems because \Mycommand tries to read the
following argument. To solve this problem you can use the \protected
modifier when you create \Mycommand.
\starttext
\def\Mycommand#1{#1}% fails
%\protected\def\Mycommand#1{#1}% works
\edef\CheckMycommand{\Mycommand}
\ifempty\CheckMycommand
\tex{Mycommand} is empty
\else
\tex{Mycommand} has content
\fi
\stoptext
If just found the following in the lowlevel-macros manual:
«Traditional TEX has three prefixes that can be used with macros:
\global, \outer and \long. The last two are no-op's in LuaMetaTEX and if
you want to know what they do (did) you can look it up in the TEXbook.»
So, \long is gone, but why is that? Is there a new mechanism that serves
the same purpose? Other than using a vbox, I mean…
The purpose of the \long modifier is to specify whether the argument of
a command can or cannot contain multiple paragraph (either by an empty
line or with \par). This was needed by TeX in the early days where
memory was limited but not on the current machines.
For a very long time ConTeXt made each command definition long by
default (i.e. \def\...{...} behaved the same way as \long\def\...{...})
and as a result \long was dropped.
\def\CommandA#1{#1}
\long\def\CommandB#1{#1}
\starttext
\CommandA{xxx}% works
\CommandA{xxx
yyy}% fails because you have a empty line in the argument
\CommandA{xxx\par yyy}%fails because you have \par in the argument
\CommandB{xxx\par yyy}% works because \CommandB is \long
\stoptext
Wolfgang
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[NTG-context] Re: Using structureuservariables before the heading
You can find some examples in the wiki to do something similar: https://wiki.contextgarden.net/Generate_Authorlist_from_Head_Content Also you can use setups instead of macro definitions, and create spaces with \space, \par, etc: https://wiki.contextgarden.net/Setups -- Andrés Conrado Montoya Andi Kú andresconr...@gmail.com http://sesentaycuatro.com http://messier87.com http://chiquitico.org Los fines no justifican los medios, porque la medida verdadera de nuestro carácter está dada por los medios que estamos dispuestos a utilizar, no por los fines que proclamamos. “You develop an instant global consciousness, a people orientation, an intense dissatisfaction with the state of the world, and a compulsion to do something about it. From out there on the moon, international politics look so petty. You want to grab a politician by the scruff of the neck and drag him a quarter of a million miles out and say, ‘Look at that, you son of a bitch.’” — Apollo 14 astronaut Edgar Mitchell ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / https://www.ntg.nl/mailman/listinfo/ntg-context webpage : https://www.pragma-ade.nl / http://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : https://contextgarden.net ___
[NTG-context] Re: Using structureuservariables before the heading
Von: Wolfgang Schuster
Gesendet: Dienstag, 12. September 2023 23:16
An: Maier, Denis Christian (UB)
Cc: ntg-context@ntg.nl
Betreff: Re: [NTG-context] Using structureuservariables before the heading
denis.ma...@unibe.ch<mailto:denis.ma...@unibe.ch> schrieb am 12.09.2023 um
21:38:
Von: Wolfgang Schuster
<mailto:wolfgang.schuster.li...@gmail.com>
Gesendet: Dienstag, 12. September 2023 21:30
An: Maier, Denis Christian (UB)
<mailto:denis.ma...@unibe.ch>
Cc: ntg-context@ntg.nl<mailto:ntg-context@ntg.nl>
Betreff: Re: [NTG-context] Using structureuservariables before the heading
denis.ma...@unibe.ch<mailto:denis.ma...@unibe.ch> schrieb am 12.09.2023 um
21:24:
Von: Wolfgang Schuster
<mailto:wolfgang.schuster.li...@gmail.com>
Gesendet: Dienstag, 12. September 2023 20:41
An: mailing list for ConTeXt users
<mailto:ntg-context@ntg.nl>; Maier, Denis Christian (UB)
<mailto:denis.ma...@unibe.ch>
Betreff: Re: [NTG-context] Using structureuservariables before the heading
denis.ma...@unibe.ch<mailto:denis.ma...@unibe.ch> schrieb am 12.09.2023 um
17:47:
Hi,
is it possible to access a structureuservariable before the heading's title ?
Using the key does not seem to work.
There are ways but not in a general way because you try to access the values
before they are known to ConTeXt. To provide a proper solution you have
to tell what you're trying to achieve.
I'm just trying to output the author's name above a chapter heading. Do you
need more information?
You can create a custom header for the chapter page and show the value of the
author key
which works without problems because the header is added after to the finished
page
after the value is available.
Another option when the name should appear in the same space as the chapter
title
is a custom layout for the title.
Yes, I've tried that in the original MWE:
...
Here, I'm getting just before <3 Third>. So I guess this goes in
the right direction, but \define doesn't allow for blanks etc.
\starttexdefinition and \def on the other hand gave me erros.
You need a box to get the author on a separate line.
% \define[2]\ChapterCommand
% {\vbox
% {\structureuservariable{author}
% \blank
% #1\space#2}}
\starttexdefinition protected ChapterCommand #1#2
\vbox\bgroup
\structureuservariable{author}
\blank
#1\space#2
\egroup
\stoptexdefinition
Thank you so much, Wolfgang!
Why do you need protected here? I've realized that \protected\def also helps a
bit, but, of course, paragraph breaks are ignored there as well...
If just found the following in the lowlevel-macros manual:
So, \long is gone, but why is that? Is there a new mechanism that serves the
same purpose? Other than using a vbox, I mean...
Best,
Denis
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[NTG-context] Re: Using structureuservariables before the heading
denis.ma...@unibe.ch schrieb am 12.09.2023 um 21:38:
*Von:*Wolfgang Schuster
*Gesendet:* Dienstag, 12. September 2023 21:30
*An:* Maier, Denis Christian (UB)
*Cc:* ntg-context@ntg.nl
*Betreff:* Re: [NTG-context] Using structureuservariables before the
heading
denis.ma...@unibe.ch <mailto:denis.ma...@unibe.ch> schrieb am
12.09.2023 um 21:24:
*Von:*Wolfgang Schuster
<mailto:wolfgang.schuster.li...@gmail.com>
*Gesendet:* Dienstag, 12. September 2023 20:41
*An:* mailing list for ConTeXt users
<mailto:ntg-context@ntg.nl>; Maier, Denis Christian (UB)
<mailto:denis.ma...@unibe.ch>
*Betreff:* Re: [NTG-context] Using structureuservariables before
the heading
denis.ma...@unibe.ch <mailto:denis.ma...@unibe.ch> schrieb am
12.09.2023 um 17:47:
Hi,
is it possible to access a structureuservariable before the
heading’s title ?
Using the «before» key does not seem to work.
There are ways but not in a general way because you try to access
the values
before they are known to ConTeXt. To provide a proper solution you
have
to tell what you're trying to achieve.
I’m just trying to output the author’s name above a chapter
heading. Do you need more information?
You can create a custom header for the chapter page and show the value
of the author key
which works without problems because the header is added after to the
finished page
after the value is available.
Another option when the name should appear in the same space as the
chapter title
is a custom layout for the title.
Yes, I’ve tried that in the original MWE:
%%
\setuphead[chapter][
before={Before: \structureuservariable{author}\blank},
beforesection={Beforesection: \structureuservariable{author}\blank},
insidesection={Insidesection: \structureuservariable{author}\blank},
after={After: \structureuservariable{author}\blank},
]
\def\myChapterCommand#1#2{\structureuservariable{author}\space\blank}
\define[2]\myChapterCommand{\structureuservariable{author}\blank
#1\space#2}
%\def\myChapterCommand#1#2{\structureuservariable{author}\blank
#1\space#2} % does not work
% \starttexdefinition myChapterCommand #1 #2 % doesn't work either,
but at least blanks should work
% \structureuservariable{author}
% Test
% \blank
% #1\space#2
% \stoptexdefinition
\starttext
\myChapterCommand{1}{asdf}
\startchapter[title=First][author=First Author]
\input knuth
\stopchapter
\startchapter[title=Second][author=Second Author]
\input knuth
\stopchapter
\setuphead[chapter]
[
before=,after=,beforesection=,insidesection=,
command=\myChapterCommand,
]
\startchapter[title=Third][author={Third Author}]
\input knuth
\stopchapter
\stoptext
%%
Here, I’m getting «Third author» just before «3 Third». So I guess
this goes in the right direction, but \define doesn’t allow for blanks
etc. \starttexdefinition and \def on the other hand gave me erros.
You need a box to get the author on a separate line.
% \define[2]\ChapterCommand
% {\vbox
% {\structureuservariable{author}
% \blank
% #1\space#2}}
\starttexdefinition protected ChapterCommand #1#2
\vbox\bgroup
\structureuservariable{author}
\blank
#1\space#2
\egroup
\stoptexdefinition
\setuphead
[chapter]
[command=\ChapterCommand]
\starttext
\startchapter[title=First][author=First Author]
\input knuth
\stopchapter
\startchapter[title=Second][author=Second Author]
\input knuth
\stopchapter
\startchapter[title=Third][author={Third Author}]
\input knuth
\stopchapter
\stoptext
Wolfgang
___
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[NTG-context] Re: Using structureuservariables before the heading
Von: Wolfgang Schuster
Gesendet: Dienstag, 12. September 2023 21:30
An: Maier, Denis Christian (UB)
Cc: ntg-context@ntg.nl
Betreff: Re: [NTG-context] Using structureuservariables before the heading
denis.ma...@unibe.ch<mailto:denis.ma...@unibe.ch> schrieb am 12.09.2023 um
21:24:
Von: Wolfgang Schuster
<mailto:wolfgang.schuster.li...@gmail.com>
Gesendet: Dienstag, 12. September 2023 20:41
An: mailing list for ConTeXt users
<mailto:ntg-context@ntg.nl>; Maier, Denis Christian (UB)
<mailto:denis.ma...@unibe.ch>
Betreff: Re: [NTG-context] Using structureuservariables before the heading
denis.ma...@unibe.ch<mailto:denis.ma...@unibe.ch> schrieb am 12.09.2023 um
17:47:
Hi,
is it possible to access a structureuservariable before the heading's title ?
Using the key does not seem to work.
There are ways but not in a general way because you try to access the values
before they are known to ConTeXt. To provide a proper solution you have
to tell what you're trying to achieve.
I'm just trying to output the author's name above a chapter heading. Do you
need more information?
You can create a custom header for the chapter page and show the value of the
author key
which works without problems because the header is added after to the finished
page
after the value is available.
Another option when the name should appear in the same space as the chapter
title
is a custom layout for the title.
Yes, I've tried that in the original MWE:
%%
\setuphead[chapter][
before={Before: \structureuservariable{author}\blank},
beforesection={Beforesection: \structureuservariable{author}\blank},
insidesection={Insidesection: \structureuservariable{author}\blank},
after={After: \structureuservariable{author}\blank},
]
\def\myChapterCommand#1#2{\structureuservariable{author}\space\blank}
\define[2]\myChapterCommand{\structureuservariable{author}\blank #1\space#2}
%\def\myChapterCommand#1#2{\structureuservariable{author}\blank #1\space#2} %
does not work
% \starttexdefinition myChapterCommand #1 #2 % doesn't work either, but at
least blanks should work
% \structureuservariable{author}
% Test
% \blank
% #1\space#2
% \stoptexdefinition
\starttext
\myChapterCommand{1}{asdf}
\startchapter[title=First][author=First Author]
\input knuth
\stopchapter
\startchapter[title=Second][author=Second Author]
\input knuth
\stopchapter
\setuphead[chapter]
[
before=,after=,beforesection=,insidesection=,
command=\myChapterCommand,
]
\startchapter[title=Third][author={Third Author}]
\input knuth
\stopchapter
\stoptext
%%
Here, I'm getting just before <3 Third>. So I guess this goes in
the right direction, but \define doesn't allow for blanks etc.
\starttexdefinition and \def on the other hand gave me erros.
Denis
___
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[NTG-context] Re: Using structureuservariables before the heading
denis.ma...@unibe.ch schrieb am 12.09.2023 um 21:24: *Von:*Wolfgang Schuster *Gesendet:* Dienstag, 12. September 2023 20:41 *An:* mailing list for ConTeXt users ; Maier, Denis Christian (UB) *Betreff:* Re: [NTG-context] Using structureuservariables before the heading denis.ma...@unibe.ch <mailto:denis.ma...@unibe.ch> schrieb am 12.09.2023 um 17:47: Hi, is it possible to access a structureuservariable before the heading’s title ? Using the «before» key does not seem to work. There are ways but not in a general way because you try to access the values before they are known to ConTeXt. To provide a proper solution you have to tell what you're trying to achieve. I’m just trying to output the author’s name above a chapter heading. Do you need more information? You can create a custom header for the chapter page and show the value of the author key which works without problems because the header is added after to the finished page after the value is available. Another option when the name should appear in the same space as the chapter title is a custom layout for the title. Wolfgang ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / https://www.ntg.nl/mailman/listinfo/ntg-context webpage : https://www.pragma-ade.nl / http://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : https://contextgarden.net ___
[NTG-context] Re: Using structureuservariables before the heading
Von: Wolfgang Schuster Gesendet: Dienstag, 12. September 2023 20:41 An: mailing list for ConTeXt users ; Maier, Denis Christian (UB) Betreff: Re: [NTG-context] Using structureuservariables before the heading denis.ma...@unibe.ch<mailto:denis.ma...@unibe.ch> schrieb am 12.09.2023 um 17:47: Hi, is it possible to access a structureuservariable before the heading's title ? Using the key does not seem to work. There are ways but not in a general way because you try to access the values before they are known to ConTeXt. To provide a proper solution you have to tell what you're trying to achieve. I'm just trying to output the author's name above a chapter heading. Do you need more information? Denis ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / https://www.ntg.nl/mailman/listinfo/ntg-context webpage : https://www.pragma-ade.nl / http://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : https://contextgarden.net ___
[NTG-context] Re: Using structureuservariables before the heading
denis.ma...@unibe.ch schrieb am 12.09.2023 um 17:47: Hi, is it possible to access a structureuservariable before the heading’s title ? Using the «before» key does not seem to work. There are ways but not in a general way because you try to access the values before they are known to ConTeXt. To provide a proper solution you have to tell what you're trying to achieve. Wolfgang ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / https://www.ntg.nl/mailman/listinfo/ntg-context webpage : https://www.pragma-ade.nl / http://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : https://contextgarden.net ___
[NTG-context] Re: Using structureuservariables before the heading
Ok, \starttexdefinition allows blanks, apparently just like setups.
But, it still fails exactly like the version with \def
\setuphead[chapter][
before={Before: \structureuservariable{author}\blank},
beforesection={Beforesection: \structureuservariable{author}\blank},
insidesection={Insidesection: \structureuservariable{author}\blank},
after={After: \structureuservariable{author}\blank},
]
\def\myChapterCommand#1#2{\structureuservariable{author}\space\blank}
\define[2]\myChapterCommand{\structureuservariable{author}\blank #1\space#2}
%\def\myChapterCommand#1#2{\structureuservariable{author}\blank #1\space#2} %
does not work
% \starttexdefinition myChapterCommand #1 #2 % doesn't work either, but at
least blanks should work
% \structureuservariable{author}
% Test
% \blank
% #1\space#2
% \stoptexdefinition
\starttext
\myChapterCommand{1}{asdf}
\startchapter[title=First][author=First Author]
\input knuth
\stopchapter
\startchapter[title=Second][author=Second Author]
\input knuth
\stopchapter
\setuphead[chapter]
[
before=,after=,beforesection=,insidesection=,
command=\myChapterCommand,
]
\startchapter[title=Third][author={Third Author}]
\input knuth
\stopchapter
\stoptext
Von: denis.ma...@unibe.ch
Gesendet: Dienstag, 12. September 2023 17:48
An: ntg-context@ntg.nl
Betreff: [NTG-context] Using structureuservariables before the heading
Hi,
is it possible to access a structureuservariable before the heading's title ?
Using the key does not seem to work.
As an aside, I've tried to use the < command > key to provide my own command,
but while \define works here (but ignores \blank), \def gives me an error.
Why is that?
How would you add blanks to a user-defined command?
Best,
Denis
\setuphead[chapter][
before={Before: \structureuservariable{author}\blank},
beforesection={Beforesection: \structureuservariable{author}\blank},
insidesection={Insidesection: \structureuservariable{author}\blank},
after={After: \structureuservariable{author}\blank},
]
\def\myChapterCommand#1#2{\structureuservariable{author}\space\blank}
\define[2]\myChapterCommand{\structureuservariable{author}\blank #1\space#2}
%\def\myChapterCommand#1#2{\structureuservariable{author}\blank #1\space#2} %
does not work
\starttext
\macro{1}{2}
\startchapter[title=First][author=First Author]
\input knuth
\stopchapter
\startchapter[title=Second][author=Second Author]
\input knuth
\stopchapter
\setuphead[chapter]
[
before=,after=,beforesection=,insidesection=,
command=\myChapterCommand,
]
\startchapter[title=Third][author=Third Author]
\input knuth
\stopchapter
\stoptext
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