* Definition of lualetterbackslash
@ 2011-08-22 7:15 Aditya Mahajan
2011-08-22 8:06 ` Hans Hagen
0 siblings, 1 reply; 4+ messages in thread
From: Aditya Mahajan @ 2011-08-22 7:15 UTC (permalink / raw)
To: mailing list for ConTeXt users
Hi
Consider the following example:
\startluacode
print("lualetterbackslash:", [=[\\include]=])
\stopluacode
\def\lualetterbackslash{\letterbackslash}
\startluacode
print("letterbackslash:", [=[\\include]=])
\stopluacode
\bye
gives
lualetterbackslash: \\include
letterbackslash: \include
I find the second alternative better. Why is \lualetterbackslash defined
differently from \letterbackslash?
Aditya
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* Re: Definition of lualetterbackslash
2011-08-22 7:15 Definition of lualetterbackslash Aditya Mahajan
@ 2011-08-22 8:06 ` Hans Hagen
2011-08-22 8:49 ` Aditya Mahajan
0 siblings, 1 reply; 4+ messages in thread
From: Hans Hagen @ 2011-08-22 8:06 UTC (permalink / raw)
To: mailing list for ConTeXt users
On 22-8-2011 09:15, Aditya Mahajan wrote:
> Hi
>
> Consider the following example:
>
> \startluacode
> print("lualetterbackslash:", [=[\\include]=])
> \stopluacode
>
> \def\lualetterbackslash{\letterbackslash}
> \startluacode
> print("letterbackslash:", [=[\\include]=])
> \stopluacode
>
> \bye
>
> gives
>
> lualetterbackslash: \\include
> letterbackslash: \include
>
> I find the second alternative better. Why is \lualetterbackslash defined
> differently from \letterbackslash?
to avoid problems with \n, \t and such
btw, best use context.include then as it provides you better tracing
Hans
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Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
| www.pragma-pod.nl
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* Re: Definition of lualetterbackslash
2011-08-22 8:06 ` Hans Hagen
@ 2011-08-22 8:49 ` Aditya Mahajan
2011-08-22 9:13 ` Hans Hagen
0 siblings, 1 reply; 4+ messages in thread
From: Aditya Mahajan @ 2011-08-22 8:49 UTC (permalink / raw)
To: Hans Hagen; +Cc: mailing list for ConTeXt users
On Mon, 22 Aug 2011, Hans Hagen wrote:
> On 22-8-2011 09:15, Aditya Mahajan wrote:
>> Hi
>>
>> Consider the following example:
>>
>> \startluacode
>> print("lualetterbackslash:", [=[\\include]=])
>> \stopluacode
>>
>> \def\lualetterbackslash{\letterbackslash}
>> \startluacode
>> print("letterbackslash:", [=[\\include]=])
>> \stopluacode
>>
>> \bye
>>
>> gives
>>
>> lualetterbackslash: \\include
>> letterbackslash: \include
>>
>> I find the second alternative better. Why is \lualetterbackslash defined
>> differently from \letterbackslash?
>
> to avoid problems with \n, \t and such
Ah, I see.
> btw, best use context.include then as it provides you better tracing
Well, \include is a lilypond command that must be written to an external
file, something like this:
\startluacode
lilypond_preamble = [[
\\include "lilypond-book-preamble.py"
other settings that will be substituted at run-time
]]
buffers.assign("preamble", lilypond_preamble)
\stopluacode
\startbuffer[content]
content of lilypond file
\stopbuffer
\savebuffer[preamble,content][temp-file]
\bye
I'll probably just use
\appendtoks
\def\/{\letterbackslash}
\to\everyluacode
and then \/include. Other than using the magic single letter commands, I
don't see an easy way of getting a \ in a lua string inside luacode :(
- \noexpand\include fails unless I define \include
- \letterbackslash include gives "\ include"
- \letterbackslash{}include gives "\{}include"
Aditya
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* Re: Definition of lualetterbackslash
2011-08-22 8:49 ` Aditya Mahajan
@ 2011-08-22 9:13 ` Hans Hagen
0 siblings, 0 replies; 4+ messages in thread
From: Hans Hagen @ 2011-08-22 9:13 UTC (permalink / raw)
To: Aditya Mahajan; +Cc: mailing list for ConTeXt users
On 22-8-2011 10:49, Aditya Mahajan wrote:
> and then \/include. Other than using the magic single letter commands, I
> don't see an easy way of getting a \ in a lua string inside luacode :(
>
> - \noexpand\include fails unless I define \include
> - \letterbackslash include gives "\ include"
> - \letterbackslash{}include gives "\{}include"
you can also play with
\luaescapestring{...}
\detokenize{...}
or just
\string\include
-----------------------------------------------------------------
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | voip: 087 875 68 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
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archive : http://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___________________________________________________________________________________
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2011-08-22 8:06 ` Hans Hagen
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2011-08-22 9:13 ` Hans Hagen
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