[PyFeyn] pyfeyn-0.3.3 and PyX-0.12.1

[Georg von Hippel]

Dear Andrey,

thanks for the patch -- we have been aware of this issue for a while, and 
an official patch exists, but hasn't been made public yet; the problem we 
had was to make sure that pyfeyn works with both older and newer versions 
of PyX, so there have to be some workarounds for the _arrowhead() issue. 
Version 0.3.4 will be up on HEPforge soon.

Thanks for using PyFeyn, and best regards,

    Georg

-- 
============================================================================

  Dr. Georg von Hippel
  Institut für Kernphysik                 Phone:  +49 6131 39-22933
  Johannes Gutenberg-Universität Mainz    Fax:    +49 6131 39-22964
  Johann-Joachim-Becher-Weg 45            Email:  hippel at kph.uni-mainz.de
  55099 Mainz, Germany

============================================================================


On Tue, 25 Feb 2014, Andrey G. Grozin wrote:

> Hello,
>
> There are problems in pyfeyn with recent versions of PyX.
>
> 1. In __init__.py: there is no pyx.pykpathsea.kpse_tex_format
> Indeed, the string kpse_tex_format is present in PyX sources just once, in 
> pykpathsea.c, and this line is commented out. I don't know the meaning of the 
> second argument of pyx.pykpathsea.find_file, so, I had to do 
> pyx.text.defaulttexrunner.preamble(r"\usepackage{hepnames}") unconditionally.
>
> 2. pyx.deco._arrowhead must have 7 arguments, only 6 are provided in deco.py. 
> Again, I don't know the meaning of all these arguments. I made a guess that 
> the missing 6-th arg can be self.constriction (because the argument name in 
> _arrowhead is constriction); test scripts work, and arrows seem to be OK.
>
> So, I made a Gentoo package (ebuild) with the attached patch. The 
> pyfeyn-0.3.3 package depends on PyX (currently 0.12.1) and texlive-science 
> (this package contains hepnames). Now committed to the Gentoo repository.
>
> What about porting to python-3 and, correspondingly, using PyX-0.13? Are 
> there such plans? Probably, this should not be very difficult...
>
> Thank you for the package,
> Andrey Grozin,
> theoretical physicist and Gentoo developer