On 27.07.08, Steve Litt wrote:
> On Sunday 27 July 2008 17:09, Steve Litt wrote:
> > ...
> > if I create and use two LyX styles, Code1 and Code2, each of them
> > with CopyStyle LyX-Code, then on conversion to PDF I get the following
> > error message:
> >
> > LaXeX Error: Command \lyxcode already defined
> >
> > I can use all Code1, or all Code2, or all LyX-Code, but if I have any two
> > of them in the document, I get an error like described above.
...
> > Is there a simple way I can use CopyStyle with LyX-Code and not get this
> > error?
Yes. Overwrite the Preamble definiton by defining a replacement (maybe
empty) in your copy.
> I found a fix I can use locally, and a fix that could be made with the LyX
> distribution. Let me start with the latter...
> LyX-Code is defined in lyxdir/layouts/lyxmacros.inc thusly:
> Style LyX-Code
...
> Preamble
...
> EndPreamble
...
> End
> Notice that the LaTeX environment, lyxcode, is defined within the LyX
> environment definition, so if LyX-Code is mentioned twice, \lyxcode is
> defined twice, which is an error.
No.
If you use LyX-Code n times (with n = 1, ..., \infty) in your
document, exactly one Preamble code is inserted in the latex preamble.
Iy you do not use LyX-Code (i.e. n=0), the Preamble latex code is not
used.
> To fix the problem, the developers could remove everything from Preamble to
> EndPreamble in the LyX-Code definition, and put it after the "Format 4" and
> before any LyX style definitions.
In this case, every document that used this layout will have the \lyxcode
definition in the latex preamble. As most documents do not use LyX-Code,
this is not desired.
> It's nice and modular to put the LaTeX definition inside the LyX
> definition, but doing so greatly reduces the value of CopyStyle, so I'd
> recommend against it.
It also produces cleaner LaTeX sources, so I want it to stay.
All you have to remember is that the Styles that define their own
preamble need special care when copied with CopyStyle (i.e. a new
Preamble definition).
> In other words, I copied and pasted \lyxcode to \litt_lyxcode within my
> layout file, and copied and pasted LyX-Code (minus the
> Preamble/EndPreamble section) to litt_LyX-Code within my layout file,
> and then did CopyStyle on litt_LyX-Code. It worked perfectly!
If you need the lyxcode definition in several Styles, you can:
1. Copy the Preamble section from the original LyXCode to your layout
file (as general Preamble code).
2. Redefine LyXCode:
Style LyXCode
Preamble
EndPreamble
3. Copy the redefined one, e.g.
Style MyLyXCode
CopyStyle LyXCode
LatexName \mycode
Preamble
\newcommand{\mycode}{Hi world!\\ \lyxcode}
EndPreamble
End
This is Untested, but you should get the general idea!
Günter
