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/usr/lib/python2.7/dist-packages/sagenb/notebook/sagetex.py is in python-sagenb 1.0.1+ds1-2.

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# -*- coding: utf-8 -*
import os

from .notebook_object import notebook

def sagetex(filename, gen=True, **kwds):
    """
    Turn a latex document into an interactive notebook server.

    THIS IS ONLY A PROOF-of-CONCEPT.

    EXAMPLES::

        sage: sagetex('foo.tex')        # not tested
        [pops up web browser with live version of foo.tex.]
    """
    if not os.path.exists(filename):
        raise IOError("No such file: '%s'" % filename)

    if not filename.endswith('.tex'):
        raise ValueError("File must be a latex file (end in .tex): '%s'" % filename)
    if not '\\document' in open(filename).read():
        raise ValueError("File must be a latex file (contain \\document...): '%s'" % filename)
    
    if gen:
        os.system('latex2html -no_images %s'%filename)

    base = os.path.splitext(os.path.split(filename)[1])[0]
    absp = os.path.abspath(filename)
    path = os.path.splitext(absp)[0]

    for F in os.listdir(base):
        fn = os.path.join(base, F)
        if not fn.endswith('.html'):
            continue
        r = open(fn).read()
        r = r.replace('<PRE>', '<div class="verbatim"><pre>')
        r = r.replace('</PRE>', '</pre></div>')
        open(fn,'w').write(r)

    notebook(sagetex_path=path, start_path="/sagetex/index.html", **kwds)