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