Pandoc filter to create PDF files from SVG

pandoc-svg.py

#! /usr/bin/env python
"""
Pandoc filter to convert svg files to pdf as suggested at:
https://github.com/jgm/pandoc/issues/265#issuecomment-27317316
"""

__author__ = "Jerome Robert"

import mimetypes
import subprocess
import os
import sys
from pandocfilters import toJSONFilter, Str, Para, Image

fmt_to_option = {
    "latex": ("--export-pdf","pdf"),
    "beamer": ("--export-pdf","pdf"),
    #use PNG because EMF and WMF break transparency
    "docx": ("--export-png", "png"),
    #because of IE
    "html": ("--export-png", "png")
}

def svg_to_any(key, value, fmt, meta):
    if key == 'Image':
       if len(value) == 2:
           # before pandoc 1.16
           alt, [src, title] = value
           attrs = None
       else:
           attrs, alt, [src, title] = value
       mimet,_ = mimetypes.guess_type(src)
       option = fmt_to_option.get(fmt)
       if mimet == 'image/svg+xml' and option:
           base_name,_ = os.path.splitext(src)
           eps_name = base_name + "." + option[1]
           try:
               mtime = os.path.getmtime(eps_name)
           except OSError:
               mtime = -1
           if mtime < os.path.getmtime(src):
               cmd_line = ['inkscape', option[0], eps_name, src]
               sys.stderr.write("Running %s\n" % " ".join(cmd_line))
               subprocess.call(cmd_line, stdout=sys.stderr.fileno())
           if attrs:
               return Image(attrs, alt, [eps_name, title])
           else:
               return Image(alt, [eps_name, title])

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

           if re.match('https?\://',src):
               bsnm = urllib.unquote(os.path.basename(srcm).encode('utf8'))
               bsnm = re.sub('[^a-zA-Z0-9\.]','',bsnm)
               src,h = urllib.urlretrieve(src,bsnm)
               base_name,_ = os.path.splitext(bsnm)
               eps_name = base_name + "." + option[1]
           else:
               base_name, _ = os.path.splitext(src)
               eps_name = os.path.realpath(base_name + "." + option[1])
               src = os.path.realpath(src)

one further adjustment. Inkscape crashes on macos ** (inkscape-bin:91102): WARNING **: Can't open file: image.svg (doesn't exist), caused by some weird sh wrapper around inkscape, that sets some weird working directory. Using os.realpath() fixes that

For the new Inkscape 1.0 on Catalina --export-filename has superseded --export-pdf

fmt_to_option = {
    "latex": ("--export-filename","pdf"),
    "beamer": ("--export-filename","pdf"),
    #use PNG because EMF and WMF break transparency
    "docx": ("--export-png", "png"),
    #because of IE
    "html": ("--export-png", "png")
}

--export-filename should now be used in place of both --export-pdf and --export-png.

fmt_to_option = {
    "latex": ("--export-filename","pdf"),
    "beamer": ("--export-filename","pdf"),
    #use PNG because EMF and WMF break transparency
    "docx": ("--export-filename", "png"),
    #because of IE
    "html": ("--export-filename", "png")
}