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graphviz pandoc filter
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#!/usr/bin/env python | |
# from https://gist.github.com/j9ac9k/92ec73ced404a4629b0f6487275dab54/ | |
""" | |
Pandoc filter to process code blocks with class "graphviz" into | |
graphviz-generated images. | |
Needs pygraphviz | |
""" | |
import os | |
import sys | |
import pygraphviz | |
from pandocfilters import toJSONFilter, Para, Image, get_filename4code, get_caption, get_extension, RawBlock | |
def graphviz(key, value, format, _): | |
if key == 'CodeBlock': | |
[[ident, classes, keyvals], code] = value | |
if "graphviz" in classes: | |
caption, typef, keyvals = get_caption(keyvals) | |
if format == 'html': | |
g = pygraphviz.AGraph(string=code) | |
g.layout() | |
svg_string = g.draw(format='svg').decode() | |
svg_without_doctype = svg_string.split("\n", 3)[3] | |
return RawBlock("html", svg_without_doctype) | |
else: | |
filetype = get_extension(format, "png", html="png", latex="pdf") | |
dest = get_filename4code("graphviz", code, filetype) | |
if not os.path.isfile(dest): | |
g = pygraphviz.AGraph(string=code) | |
g.layout() | |
g.draw(dest) | |
sys.stderr.write('Created image ' + dest + '\n') | |
return Para([Image([ident, [], keyvals], caption, [dest, typef])]) | |
if __name__ == "__main__": | |
toJSONFilter(graphviz) |
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