How to not gobble space after a command

How to not gobble space after a command

[Matthijs Kooijman]

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Hi all,

I'm working with a few custom macros to simplify typing a bit, like:

\def\VHDL{\small{VHDL}}

However, when I use this macro in text, like \VHDL this, it gobbles the space
after it. I've seen some references that say to solve this by writing \VHDL{}
instead, but that is of course very unpretty. I've tried to put all kinds of
stuff ({}, \mbox{}, \obeyedspace, etc.) inside the \VHDL macro, but it seems
the space is already gone there, so that didn't work. (Note that just putting
a space inside the macro won't work, for cases where I use \VHDL, like this)

It seems that latex has an xspace package that does some guesswork about
whether a space is required, but it looks mightily scary. Does ConTeXt provide
for any way to solve this problem in a nice way? Or is this just so
fundamental in TeX that there is no real solution?

Gr.

Matthijs

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Re: How to not gobble space after a command

[luigi scarso]

On Fri, Nov 20, 2009 at 11:23 AM, Matthijs Kooijman <matthijs@stdin.nl> wrote:
> Hi all,
>
> I'm working with a few custom macros to simplify typing a bit, like:
>
> \def\VHDL{\small{VHDL}}
>
> However, when I use this macro in text, like \VHDL this, it gobbles the space
> after it. I've seen some references that say to solve this by writing \VHDL{}
> instead, but that is of course very unpretty. I've tried to put all kinds of
> stuff ({}, \mbox{}, \obeyedspace, etc.) inside the \VHDL macro, but it seems
> the space is already gone there, so that didn't work. (Note that just putting
> a space inside the macro won't work, for cases where I use \VHDL, like this)
>
> It seems that latex has an xspace package that does some guesswork about
> whether a space is required, but it looks mightily scary. Does ConTeXt provide
> for any way to solve this problem in a nice way? Or is this just so
> fundamental in TeX that there is no real solution?

I don't know the answer.

But I remember that a similar question time ago
trigged to me to know more about \futurelet
and I consider it a real gain for my own personal macro.

Maybe can be the same for you.

-- 
luigi
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Re: How to not gobble space after a command

[Taco Hoekwater]

luigi scarso wrote:
> On Fri, Nov 20, 2009 at 11:23 AM, Matthijs Kooijman <matthijs@stdin.nl> wrote:
>> Hi all,
>>
>> I'm working with a few custom macros to simplify typing a bit, like:
>>
>> \def\VHDL{\small{VHDL}}
>>
>> However, when I use this macro in text, like \VHDL this, it gobbles the space
>> after it. I've seen some references that say to solve this by writing \VHDL{}
>> instead, but that is of course very unpretty. I've tried to put all kinds of
>> stuff ({}, \mbox{}, \obeyedspace, etc.) inside the \VHDL macro, but it seems
>> the space is already gone there, so that didn't work. (Note that just putting
>> a space inside the macro won't work, for cases where I use \VHDL, like this)

\autoinsertnextspace is the context version of \xspace (could be mkii
only)




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Re: How to not gobble space after a command

[Matthijs Kooijman]

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> \autoinsertnextspace is the context version of \xspace (could be mkii
> only)
Woah, that works (in MkIV). Thanks!

Gr.

Matthijs

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Re: How to not gobble space after a command

[luigi scarso]

On Fri, Nov 20, 2009 at 11:41 AM, Matthijs Kooijman <matthijs@stdin.nl> wrote:
>> \autoinsertnextspace is the context version of \xspace (could be mkii
>> only)
> Woah, that works (in MkIV). Thanks!

hm , some problem here
# context --version
MTXrun | main context file: context.tex
MTXrun | current version: 2009.11.10 13:30



%%% test.tex
\starttext
\tracingall \autoinsertnextspace\tracingnone
A
\stoptext

#context test

{undefined}
! Undefined control sequence.
l.2 \tracingall \autoinsertnextspace
                                    \tracingnone




# grep autoinsertnextspace *
spac-gen.mkii:%D \setupsorting[logo][next=\autoinsertnextspace] \logo[TEX]{\TeX}
spac-gen.mkii:\def\autoinsertnextspace{\futurelet\nexttoken\doautoinsertnextspace}
spac-gen.mkii:\def\doautoinsertnextspace % slightly extended version
of a user supplied macro
strc-not.mkii:      \c!next=\autoinsertnextspace, % new, experimental
with startnotes
strc-not.mkiv:   \c!next=\autoinsertnextspace, % new, experimental
with startnotes

(note the \futurelet primitive)

-- 
luigi
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Re: How to not gobble space after a command

[Matthijs Kooijman]

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Hi Luigi,

> hm , some problem here
> # context --version
> MTXrun | main context file: context.tex
> MTXrun | current version: 2009.11.10 13:30

Your example works fine for me on an older beta:

  $ context --version
  MTXrun | main context file: /usr/share/texmf/tex/context/base/context.tex
  MTXrun | current version: 2009.10.28 19:27

I'd upgrade to see if it breaks as well, but I have a document to ship today,
so perhaps after that :-p

Gr.

Matthijs

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Re: How to not gobble space after a command

[Alan BRASLAU]

On Friday 20 November 2009 11:41:16 Matthijs Kooijman wrote:
> > \autoinsertnextspace is the context version of \xspace (could be mkii
> > only)
> 
> Woah, that works (in MkIV). Thanks!

*Everywhere* the authors use \CONTEXT\ and \TeX\ followed by
an escaped space. (Is this space [sometimes] unbreakable?)

In my own texts, I often use {\TeX} as I find this not (too)
ugly. Also, I tend to make less mistakes with this method
(since it is very easy to forget the trailing backslash).

If \autoinsertnextspace is the right solution, perhaps this
could be included in the standard definitions in cont-log.tex.

Alan
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Re: How to not gobble space after a command

[luigi scarso]

On Fri, Nov 20, 2009 at 12:00 PM, Matthijs Kooijman <matthijs@stdin.nl> wrote:
> Hi Luigi,
>
>> hm , some problem here
>> # context --version
>> MTXrun | main context file: context.tex
>> MTXrun | current version: 2009.11.10 13:30
>
> Your example works fine for me on an older beta:
>
>  $ context --version
>  MTXrun | main context file: /usr/share/texmf/tex/context/base/context.tex
>  MTXrun | current version: 2009.10.28 19:27
>
> I'd upgrade to see if it breaks as well, but I have a document to ship today,
> so perhaps after that :-p
Ok
(we all together cross the finger with you now :-) )

-- 
luigi
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Re: How to not gobble space after a command

[Matthijs Kooijman]

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Hi Luigi,

> >> hm , some problem here
> >> # context --version
> >> MTXrun | main context file: context.tex
> >> MTXrun | current version: 2009.11.10 13:30
> >
> > Your example works fine for me on an older beta:
> >
> >  $ context --version
> >  MTXrun | main context file: /usr/share/texmf/tex/context/base/context.tex
> >  MTXrun | current version: 2009.10.28 19:27

I've just tried on a somewhat newer context which I found lying around, which
does not give the error you gave (so it does know the \autoinsertnextspace
command), but it doesn't work properly either (it never inserts a space
AFAICT).

matthijs@xanthe:~$ context --version
MTXrun | main context file: /usr/share/texmf/tex/context/base/context.tex
MTXrun | current version: 2009.11.24 10:13

I'll have another go with the newest version soon.

Gr.

Matthijs

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Re: How to not gobble space after a command

[luigi scarso]

On Mon, Nov 30, 2009 at 9:53 PM, Matthijs Kooijman <matthijs@stdin.nl> wrote:
> Hi Luigi,
>
>> >> hm , some problem here
>> >> # context --version
>> >> MTXrun | main context file: context.tex
>> >> MTXrun | current version: 2009.11.10 13:30
>> >
>> > Your example works fine for me on an older beta:
>> >
>> >  $ context --version
>> >  MTXrun | main context file: /usr/share/texmf/tex/context/base/context.tex
>> >  MTXrun | current version: 2009.10.28 19:27
>
> I've just tried on a somewhat newer context which I found lying around, which
> does not give the error you gave (so it does know the \autoinsertnextspace
> command), but it doesn't work properly either (it never inserts a space
> AFAICT).
>
> matthijs@xanthe:~$ context --version
> MTXrun | main context file: /usr/share/texmf/tex/context/base/context.tex
> MTXrun | current version: 2009.11.24 10:13
>
> I'll have another go with the newest version soon.
>
> Gr.
>
> Matthijs
>
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> ___________________________________________________________________________________
> 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
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> ___________________________________________________________________________________
>
>
%%% test.tex
\starttext
\autoinsertnextspace
A
\stoptext

#context test.tex

! Undefined control sequence.
l.3 \autoinsertnextspace


# context --version
MTXrun | main context file:
/opt/luatex/minimals-beta/tex/texmf-context/tex/context/base/context.tex
MTXrun | current version: 2009.11.27 21:24

# luatex --version
This is LuaTeX, Version beta-0.46.0-2009112820

It works with texexec
#texexec test.tex

...
Output written on test-matt.pdf (1 page, 15725 bytes).

-- 
luigi
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Re: How to not gobble space after a command

[Matthijs Kooijman]

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Hi Luigi,

forget my last post. I was in a hurry last week and put a

  \def\autoinsertnextspace{}

in my document just to get it compiling on context 2009.11.24. If I remove
that, it stops working with "texexec --lua" (as well as just "context") with
the same undefined control sequence error. It still works with just "texexec"
(e.g., with MkII).

So, it works for me with 2009.10.28, and gives errors with 2009.11.24. There
is no version where it silently fails, that was my own fault :-)

Actually, it does in fact seem the macro has completely disappeared. With the
old version:

  /usr/share/texmf/tex/context/base$ grep def.autoinsertnextspace *
  spac-gen.mkii:\def\autoinsertnextspace{\futurelet\nexttoken\doautoinsertnextspace}
  spac-hor.mkiv:\def\autoinsertnextspace{\futurelet\nexttoken\doautoinsertnextspace}

With the new version:

  /usr/share/texmf/tex/context/base$ grep def.autoinsertnextspace *
  spac-gen.mkii:\def\autoinsertnextspace{\futurelet\nexttoken\doautoinsertnextspace}

The comment in the old version does say:

  %D This is a dangerous feature because it makes the \TEX\ source
  %D less portable, i.e. any parser now needs to apply exactly the
  %D same algorithm when it wants to interpret the source. We
  %D strongly recommend not to mention this feature in manuals! It's
  %D provided for users who are hooked to such a mechanism.

So perhaps this is removed intentionally? Perhaps Hans can comment?

Gr.

Matthijs

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Re: How to not gobble space after a command

[Hans Hagen]

Matthijs Kooijman wrote:
> Hi Luigi,
> 
> forget my last post. I was in a hurry last week and put a
> 
>   \def\autoinsertnextspace{}
> 
> in my document just to get it compiling on context 2009.11.24. If I remove
> that, it stops working with "texexec --lua" (as well as just "context") with
> the same undefined control sequence error. It still works with just "texexec"
> (e.g., with MkII).
> 
> So, it works for me with 2009.10.28, and gives errors with 2009.11.24. There
> is no version where it silently fails, that was my own fault :-)
> 
> Actually, it does in fact seem the macro has completely disappeared. With the
> old version:
> 
>   /usr/share/texmf/tex/context/base$ grep def.autoinsertnextspace *
>   spac-gen.mkii:\def\autoinsertnextspace{\futurelet\nexttoken\doautoinsertnextspace}
>   spac-hor.mkiv:\def\autoinsertnextspace{\futurelet\nexttoken\doautoinsertnextspace}
> 
> With the new version:
> 
>   /usr/share/texmf/tex/context/base$ grep def.autoinsertnextspace *
>   spac-gen.mkii:\def\autoinsertnextspace{\futurelet\nexttoken\doautoinsertnextspace}
> 
> The comment in the old version does say:
> 
>   %D This is a dangerous feature because it makes the \TEX\ source
>   %D less portable, i.e. any parser now needs to apply exactly the
>   %D same algorithm when it wants to interpret the source. We
>   %D strongly recommend not to mention this feature in manuals! It's
>   %D provided for users who are hooked to such a mechanism.
> 
> So perhaps this is removed intentionally? Perhaps Hans can comment?

indeed, it's a kind of hack and if we need something like that i'll make 
a better version some day ... configureable and using unicode char 
properties

i'll remove the call in mkiv

Hans


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               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
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Re: How to not gobble space after a command

[luigi scarso]

On Tue, Dec 1, 2009 at 12:14 AM, Hans Hagen <pragma@wxs.nl> wrote:
> indeed, it's a kind of hack and if we need something like that i'll make a
> better version some day ... configureable and using unicode char properties
>
> i'll remove the call in mkiv
There is no
\autoinsertnextspace
in mkiv


-- 
luigi
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Re: How to not gobble space after a command

[Hans Hagen]

luigi scarso wrote:
> On Tue, Dec 1, 2009 at 12:14 AM, Hans Hagen <pragma@wxs.nl> wrote:
>> indeed, it's a kind of hack and if we need something like that i'll make a
>> better version some day ... configureable and using unicode char properties
>>
>> i'll remove the call in mkiv
> There is no
> \autoinsertnextspace
> in mkiv

there was a

   \c!next=\autoinsertnextspace


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                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
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                                              | www.pragma-pod.nl
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Re: How to not gobble space after a command

[luigi scarso]

On Tue, Dec 1, 2009 at 12:42 AM, Hans Hagen <pragma@wxs.nl> wrote:
> there was a
>
>  \c!next=\autoinsertnextspace
Ah ok , now I have seen it
it's in strc-not.mkiv .
-- 
luigi
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