[NTG-context] Test whether variable has been set
Hi, How can test whether a variable has been set? I couldn't find any reference to this in the wiki? TIA, Elliot ___ 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 : https://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] Test whether variable has been set
Hi Elliot,
Elliot Clifton schrieb:
Hi,
How can test whether a variable has been set? I couldn't find any
reference to this in the wiki?
What do you mean by set?
I use
\doifnothing{\getvariable{foo}{bar}}
{foo:bar contains nothing.\par}%
\doifsomething{\getvariable{foo}{bar}}
{foo:bar contains something.\par}%
\doifelsenothing{\getvariable{foo}{bar}}
{foo:bar contains nothing.\par}
{foo:bar contains something.\par}%
to test, if a defined(!) variable contains something.
If you want to test if a variable is defined, you can use
\doifnotvariable{foo}{bar}
{foo:bar is undefined.\par}%
\doifvariable{foo}{bar}
{foo:bar is defined.\par}%
\doifelsevariable{foo}{bar}
{foo:bar is defined.\par}
{foo:bar is undefined.\par}%
Never used these macros, as I always define default values for my variables.
HTH, Peter
TIA,
Elliot
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Re: [NTG-context] Test whether variable has been set
Hi Peter, Thanks for your reply. I think I may have misunderstood the variable section on the wiki. I been using \setvariable to both declare and assign variables from my component files. When I should have been declaring them in the environment file first, right? \setvariable[namespace][key=DefaultValue], right? So how do I test for a (Default)Value? Sorry, I'm just beginning TeX programming I don't understand how to do this. Elliot ___ 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 : https://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] Test whether variable has been set
On Sun, 27 May 2007, Elliot Clifton wrote:
Hi Peter,
Thanks for your reply. I think I may have misunderstood the variable
section on the wiki. I been using \setvariable to both declare and
assign variables from my component files. When I should have been
declaring them in the environment file first, right?
\setvariable[namespace][key=DefaultValue], right? So how do I test for
a (Default)Value?
Sorry, I'm just beginning TeX programming I don't understand how to do this.
Elliot,
You can use \doif{\getvalue{set}{var}}{value} for simple string
comparisons. See http://wiki.contextgarden.net/System_Macros for basic
flow control features of ConTeXt.
It may also be possble to see if variables have changed using setups
http://wiki.contextgarden.net/Inside_ConTeXt#Using_setups_for_namespaces
but I have never personally used that.
Aditya
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Re: [NTG-context] Reverse itemize
Aditya Mahajan wrote: Hi, Is it possible to have a reverse key for itemize, so that \startitemize[n,reverse] \item one \item two \item three \stopitemize gives 3. one 2. two 1. three I thought that this should be easier than random items, but I can not figure how random key works. random collects the items, and only works with \startitem \stopitem, you need a change somewhere else, i'll send you a patch offlist for testing Hans -- - Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com | www.pragma-pod.nl - ___ 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 : https://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] Test whether variable has been set
Aditya Mahajan wrote:
On Sun, 27 May 2007, Elliot Clifton wrote:
Hi Peter,
Thanks for your reply. I think I may have misunderstood the variable
section on the wiki. I been using \setvariable to both declare and
assign variables from my component files. When I should have been
declaring them in the environment file first, right?
\setvariable[namespace][key=DefaultValue], right? So how do I test for
a (Default)Value?
Sorry, I'm just beginning TeX programming I don't understand how to do this.
Elliot,
You can use \doif{\getvalue{set}{var}}{value} for simple string
comparisons. See http://wiki.contextgarden.net/System_Macros for basic
flow control features of ConTeXt.
It may also be possble to see if variables have changed using setups
http://wiki.contextgarden.net/Inside_ConTeXt#Using_setups_for_namespaces
but I have never personally used that.
these test if the variable has been set (defined test):
\doifelsevariable#1#2
\doifvariable#1#2
\doifnotvariable#1#2
(is not the same as test for empty)
there is also:
\getvariabledefault#1#2#3
with #3 being a default value for when undefined
Hans
--
-
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com
| www.pragma-pod.nl
-
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Re: [NTG-context] Scite folding
Hi, On Sun, 27 May 2007 11:18:48 -0600, soft_sharesoft_share@126.com wrote: Dear all, Just come across this thread. The TeX folding feature in NotePad++ was adapted by me and originally the adaptations was made in SciTE. As I am not a ConTeXt user, I am not aware of the structure of sectioning commands in ConTeXt. Could anyone of you let me know of a minimum list of sectioning commands in ConTeXt so that I can modify the source code to make the TeX folding in SciTE and NotePad++ work also for ConTeXt documents? I could not get the Notepad++ source to compile, but then again, I am not a programmer;-) I'll zip the contents of my local notepad++ setup and send it to you [offlist], as well as some emails I sent to the notepad++ people. One more thing: we need to add an options for the .tex extension in notepad++'s Open-File dialog. I am extremely busy these days but will try to help! Best Idris -- Professor Idris Samawi Hamid Department of Philosophy Colorado State University Fort Collins, CO 80523 -- Using Opera's revolutionary e-mail client: http://www.opera.com/mail/ ___ 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 : https://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] Test whether variable has been set
Elliot Clifton schrieb:
Hi Peter,
Thanks for your reply. I think I may have misunderstood the variable
section on the wiki. I been using \setvariable to both declare and
assign variables from my component files. When I should have been
declaring them in the environment file first, right?
As long as you can garantee, that your variables are declared *before*
they are read, things are ok. But an environment or extra file is IMO
the cleanest way.
Reading an undefined variable results in the \empty token. This can be
problematic, if you expect a number; e.g.
\dimexpr\getvariable{foo}{width}\relax.
Anyway, it's no good idea to use something that is not defined.
So you have to
- define a variable, before you use it or
- use the \doifnotvariable,\doifvariable and \doifelsevariable macros
before you try to read a (maybe undefined) variable.
I can't say much about the second one. Search the ConTeXt sources to get
an idea.
The \doifnothing,\doifsomething and \doifelsenothing macros just test,
if the variable is empty or not.
A variable can be defined with an empty value (\setvariable[foo][bar=]).
I use this for automatic size calculations. If no default value is
given, then the size is calculated in my macro.
\setvariable[namespace][key=DefaultValue], right? So how do I test for
a (Default)Value?
\doifsamestring{\getvariable{foo}{bar}} {your_default_value}
{equal}%
\doifsamestringelse{\getvariable{foo}{bar}} {your_default_value}
{equal}
{unequal}%
probably not the fastest variant. If I remember it right, I had some
problems with \doif comparison (catcodes?).
Sorry, I'm just beginning TeX programming I don't understand how to do this.
No problem. If it's not in the WIKI, this is the place to ask.
Best, Peter
Elliot
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[NTG-context] Ruby version requirements
Hi all, I'm in the middle of putting together a native Mac OS X edition of ConTeXt Minimal ... for this I need to know which version of Ruby is minimally required by the latest ConTeXt release. (It wouldn't hurt though to know this for older ConTeXt versions, too ;-) Any help appreciated. Thanks, Oliver ___ 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 : https://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] Ruby version requirements
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[NTG-context] Problem with setuphead and textstyle or numberstyle
I'm trying out the chapter heading method used in In the Details in
chapter 7. I'm using exactly (I think) the code from the booklet
(except that instead of \BigText and \BigNumber I'm using
{\definedfont[Sans sa x]}.
The style parameter to \setuphead works but neither textstyle nor
numberstyle has any effect on the result.
I've included the code I'm using below and would be most grateful to
know what daft error I've made and can't spot.
Many thanks,
Tim Stone
=Code snippet below
\setuphead
[chapter]
[placehead=empty,
header=chapter,
style={\definedfont[SansText sa 3]}, %% This is the only one that is
working - if removed, reverts to normal sized Serif
textstyle={\definedfont[SansText sa 4]}, %% This isn't working - FIX ME
numberstyle={\definedfont[SansText sa 5]}] %% This isn't working -
FIX ME
\definetext
[chapter]
[header]
[\setups{chapter}]
[]
\startsetups chapter
\setups[chapter:title]
\setups[chapter:number]
\setups[chapter:finish]
\stopsetups
\definelayer
[chapter]
[width=\dimexpr(\makeupwidth+\cutspace),
height=\headerheight]
\startsetups chapter:title
\setlayerframed
[chapter]
[x=\dimexpr(\makeupwidth+\cutspace), location={left,bottom}]
[height=\headerheight,
foregroundcolor=white,
background=color,
backgroundcolor=darkblue,
frame=off,
offset=none,
align={right,lohi}]
{\hbox spread 0.5\cutspace
{\hss
\doiftextelse{\placeheadtext[chapter]}%
{\placeheadtext[chapter]}%
{\placeheadtext[title]}%
\hss} \space
\vskip .5cm}
\stopsetups
\startsetups chapter:number
\setlayerframed
[chapter]
[x=\dimexpr(\makeupwidth+\cutspace),
y=\vsize,
location={left,bottom}]
[width=\dimexpr(\cutspace-\rightmargindistance),
height=\dimexpr(\cutspace-\rightmargindistance),
foregroundcolor=blue,
background=color,
backgroundcolor=yellow,
frame=off,
offset=none,
align={middle,lohi}]
{\hbox to \hsize
{\hss
\doifmode{*bodypart}{
\placeheadnumber[chapter]
}%
\hss}
}
\stopsetups
\startsetups chapter:finish
\framed
[width=\makeupwidth,
height=\headerheight,
background=chapter,
frame=off]
{}
\stopsetups
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