view docs/tutorial/mypandocfilters/graphviz-file.py @ 3534:cd4db75413a2 stable

previous: fix behavior on obsolete cset when topic is involved (issue5708)

This patch fixes the behavior of `hg previous` when done on an obsolete
changeset having a successor of different topic.

The underlying code is bit messed up, I wanted to split the topic handling to
topic extension but I have postponed it to next bug.

#!/usr/bin/env python

"""
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, get_value

def graphviz(key, value, format, _):
    if key == 'CodeBlock':
        [[ident, classes, keyvals], file] = value
        if "graphviz-file" in classes:
            caption, typef, keyvals = get_caption(keyvals)
            prog, keyvals = get_value(keyvals, u"prog", u"dot")
            filetype = get_extension(format, "svg", html="svg", latex="pdf")
            with open(file) as f:
                code = f.read()
            dest = get_filename4code("graphviz", code, filetype)

            if not os.path.isfile(dest):
                g = pygraphviz.AGraph(string=code)
                g.layout()
                g.draw(dest, prog=prog)
                sys.stderr.write('Created image ' + dest + '\n')

            return Para([Image([ident, ['graphviz'], keyvals], caption, [dest, typef])])

if __name__ == "__main__":
    toJSONFilter(graphviz)