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#!/usr/bin/env python3
"""
Pandoc filter to process code blocks with class "ditaa" into images.
Needs `ditaa.jar` from http://ditaa.sourceforge.net/.
"""
import os
import sys
import pprint
from subprocess import call
from pandocfilters import toJSONFilter, Para, Image, get_filename4code, get_caption, get_extension
def ditaa(key, value, format, _):
if key == 'CodeBlock':
[[ident, classes, keyvals], code] = value
if "ditaa" in classes:
caption, typef, keyvals = get_caption(keyvals)
filename = get_filename4code("ditaa", code)
filetype = get_extension(format, "png", html="svg", latex="eps")
src = filename + '.txt'
dest = filename + '.' + filetype
if not os.path.isfile(dest):
with open(src, "w") as f:
f.write(code)
call(["java", "-jar", "ditaa.jar", src])
pprint.pprint(['Created image ', dest, 'typef=', typef, 'ident=', ident, 'keyvals=', keyvals, 'caption=', caption], sys.stderr)
return Para([Image([ident, [], keyvals], caption, [dest, typef])])
if __name__ == "__main__":
toJSONFilter(ditaa)
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