|
|
"""Utility for calling pandoc"""
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Copyright (c) 2013 the IPython Development Team.
|
|
|
#
|
|
|
# Distributed under the terms of the Modified BSD License.
|
|
|
#
|
|
|
# The full license is in the file COPYING.txt, distributed with this software.
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Imports
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
from __future__ import print_function
|
|
|
|
|
|
# Stdlib imports
|
|
|
import subprocess
|
|
|
import re
|
|
|
import warnings
|
|
|
from io import TextIOWrapper, BytesIO
|
|
|
|
|
|
# IPython imports
|
|
|
from IPython.utils.py3compat import cast_bytes
|
|
|
|
|
|
from .exceptions import ConversionException
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Classes and functions
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
class PandocMissing(ConversionException):
|
|
|
"""Exception raised when Pandoc is missing. """
|
|
|
pass
|
|
|
|
|
|
minimal_version = "1.12.1"
|
|
|
|
|
|
def pandoc(source, fmt, to, extra_args=None, encoding='utf-8'):
|
|
|
"""Convert an input string in format `from` to format `to` via pandoc.
|
|
|
|
|
|
This function will raise an error if pandoc is not installed.
|
|
|
Any error messages generated by pandoc are printed to stderr.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
source : string
|
|
|
Input string, assumed to be valid format `from`.
|
|
|
fmt : string
|
|
|
The name of the input format (markdown, etc.)
|
|
|
to : string
|
|
|
The name of the output format (html, etc.)
|
|
|
|
|
|
Returns
|
|
|
-------
|
|
|
out : unicode
|
|
|
Output as returned by pandoc.
|
|
|
"""
|
|
|
command = ['pandoc', '-f', fmt, '-t', to]
|
|
|
if extra_args:
|
|
|
command.extend(extra_args)
|
|
|
try:
|
|
|
p = subprocess.Popen(command,
|
|
|
stdin=subprocess.PIPE, stdout=subprocess.PIPE
|
|
|
)
|
|
|
except OSError as e:
|
|
|
raise PandocMissing(
|
|
|
"The command '%s' returned an error: %s.\n" %(" ".join(command), e) +
|
|
|
"Please check that pandoc is installed:\n" +
|
|
|
"http://johnmacfarlane.net/pandoc/installing.html"
|
|
|
)
|
|
|
out, _ = p.communicate(cast_bytes(source, encoding))
|
|
|
out = TextIOWrapper(BytesIO(out), encoding, 'replace').read()
|
|
|
return out.rstrip('\n')
|
|
|
|
|
|
|
|
|
pv_re = re.compile(r'(\d{0,3}\.\d{0,3}\.\d{0,3})')
|
|
|
def get_pandoc_version():
|
|
|
out = subprocess.check_output(['pandoc', '--version'], universal_newlines=True)
|
|
|
return pv_re.search(out).group(0)
|
|
|
|
|
|
|
|
|
pandoc.version = get_pandoc_version()
|
|
|
|
|
|
def check_pandoc_version():
|
|
|
return pandoc.version >= minimal_version
|
|
|
|
|
|
if(not check_pandoc_version()):
|
|
|
warnings.warn( "You are using an old version of pandoc (%s)\n"%pandoc.version +
|
|
|
"Recommended version is %s.\nTry updating."%minimal_version +
|
|
|
"http://johnmacfarlane.net/pandoc/installing.html.\nContinuing with doubts...",
|
|
|
RuntimeWarning,
|
|
|
stacklevel=2)
|
|
|
|
