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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
import subprocess
from pandocfilters import toJSONFilter, Para, Image
from pandocfilters import get_filename4code, get_caption, get_extension
kinds = {
'plantuml': {
'tag': 'plantuml',
'argv': lambda src, dest: [
'plantuml', '-tsvg', '-o', '.', src,
],
'ext': '.uml',
'prefix': b'@startuml\n',
'suffix': b'\n@enduml\n',
},
'dot': {
'tag': 'dot',
'argv': lambda src, dest: [
'dot', '-Tsvg', '-o', dest, src, '-Nfontname=Bitstream Charter',
'-Nfontsize=10',
],
'ext': '.dot',
'prefix': b'digraph foo {\n',
'suffix': b'}\n',
},
'roadmap': {
'tag': 'roadmap',
'argv': lambda src, dest: [
'roadmap-to-svg', src, dest,
],
'ext': '.dot',
'prefix': b'',
'suffix': b'',
},
}
def process_to_svg(kind, ident, classes, keyvals, code, format_):
caption, typef, keyvals = get_caption(keyvals)
filename = get_filename4code(kind['tag'], code)
filetype = get_extension(format_, "png", html="svg", latex="svg")
src = filename + kind['ext']
dest = filename + '.' + filetype
if not os.path.isfile(dest):
txt = code.encode(sys.getfilesystemencoding())
txt = kind['prefix'] + txt + kind['suffix']
with open(src, "wb") as f:
f.write(txt)
func = kind['argv']
argv = func(src, dest)
subprocess.check_call(argv)
sys.stderr.write('Created image ' + dest + '\n')
return Para([Image([ident, [], keyvals], caption, [dest, typef])])
def combo(key, value, format_, _):
if key == 'CodeBlock':
[[ident, classes, keyvals], code] = value
for tag, kind in kinds.items():
if tag in classes:
return process_to_svg(
kind, ident, classes, keyvals, code, format_)
def main():
toJSONFilter(combo)
if __name__ == "__main__":
main()
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