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#!/usr/bin/env python
"""
Pandoc filter to process raw latex tikz environments into images.
Assumes that pdflatex is in the path, and that the standalone
package is available. Also assumes that ImageMagick's convert
is in the path. Images are put in the tikz-images directory.
"""
import hashlib
import re
import os
import sys
import shutil
from pandoc import toJSONFilter
from subprocess import Popen, PIPE, call
from tempfile import mkdtemp
imagedir = "tikz-images"
def sha1(x):
return hashlib.sha1(x).hexdigest()
def tikz2image(tikz, filetype, outfile):
tmpdir = mkdtemp()
olddir = os.getcwd()
os.chdir(tmpdir)
f = open('tikz.tex', 'w')
f.write("""\\documentclass{standalone}
\\usepackage{tikz}
\\begin{document}
""")
f.write(tikz)
f.write("\n\\end{document}\n")
f.close()
p = call(["pdflatex", 'tikz.tex'], stdout=sys.stderr)
os.chdir(olddir)
if filetype == 'pdf':
shutil.copyfile(tmpdir + '/tikz.pdf', outfile + '.pdf')
else:
call(["convert", tmpdir + '/tikz.pdf', outfile + '.' + filetype])
shutil.rmtree(tmpdir)
def tikz(key, value, format):
if key == 'RawBlock':
[fmt, code] = value
if fmt == "latex" and re.match("\\\\begin{tikzpicture}", code):
outfile = imagedir + '/' + sha1(code)
if format == "html":
filetype = "png"
elif format == "latex":
filetype = "pdf"
else:
filetype = "png"
src = outfile + '.' + filetype
if not os.path.isfile(src):
try:
os.mkdir(imagedir)
sys.stderr.write('Created directory ' + imagedir + '\n')
except OSError:
pass
tikz2image(code, filetype, outfile)
sys.stderr.write('Created image ' + src + '\n')
return {'Para': [{'Image': [[], [src,""]]}]}
if __name__ == "__main__":
toJSONFilter(tikz)
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