# This is to allow the use of sagetex package 
# (http://www.ctan.org/tex-archive/macros/latex/contrib/sagetex)
# with latexmk.  Sagetex outputs a file with the extension .sage.
# This file is to be processed by sage software (http://sagemath.org) 
# to make a file with extension .sout.  This file is then read in by
# sagetex during a later run of (pdf)latex.
#
# This can be done by normal custom dependency.  However the .sage
# contains unimportant information about line numbers for error
# reporting. It is useful not to rerun sage if this is the only
# information that has changed in the .sage file.  So the
# hash_calc_ignore_pattern variable is used to configure latexmk to
# ignore this lines when computing whether the .sage file has
# changed. 


add_cus_dep('sage', 'sout', 0, 'makesout');
$hash_calc_ignore_pattern{'sage'} = '^( _st_.goboom|print .SageT)';
sub makesout {
   system("sage '$_[0].sage'");
}