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"""
sphinx.ext.imgconverter
~~~~~~~~~~~~~~~~~~~~~~~
Image converter extension for Sphinx
:copyright: Copyright 2007-2019 by the Sphinx team, see AUTHORS.
:license: BSD, see LICENSE for details.
"""
import subprocess
from subprocess import CalledProcessError, PIPE
from typing import Any, Dict
from sphinx.application import Sphinx
from sphinx.errors import ExtensionError
from sphinx.locale import __
from sphinx.transforms.post_transforms.images import ImageConverter
from sphinx.util import logging
logger = logging.getLogger(__name__)
class ImagemagickConverter(ImageConverter):
conversion_rules = [
('image/svg+xml', 'image/png'),
('image/gif', 'image/png'),
('application/pdf', 'image/png'),
]
def is_available(self) -> bool:
"""Confirms the converter is available or not."""
try:
args = [self.config.image_converter, '-version']
logger.debug('Invoking %r ...', args)
subprocess.run(args, stdout=PIPE, stderr=PIPE, check=True)
return True
except OSError:
logger.warning(__('convert command %r cannot be run.'
'check the image_converter setting'),
self.config.image_converter)
return False
except CalledProcessError as exc:
logger.warning(__('convert exited with error:\n'
'[stderr]\n%r\n[stdout]\n%r'),
exc.stderr, exc.stdout)
return False
def convert(self, _from: str, _to: str) -> bool:
"""Converts the image to expected one."""
try:
# append an index 0 to source filename to pick up the first frame
# (or first page) of image (ex. Animation GIF, PDF)
_from += '[0]'
args = ([self.config.image_converter] +
self.config.image_converter_args +
[_from, _to])
logger.debug('Invoking %r ...', args)
subprocess.run(args, stdout=PIPE, stderr=PIPE, check=True)
return True
except OSError:
logger.warning(__('convert command %r cannot be run.'
'check the image_converter setting'),
self.config.image_converter)
return False
except CalledProcessError as exc:
raise ExtensionError(__('convert exited with error:\n'
'[stderr]\n%r\n[stdout]\n%r') %
(exc.stderr, exc.stdout))
def setup(app: Sphinx) -> Dict[str, Any]:
app.add_post_transform(ImagemagickConverter)
app.add_config_value('image_converter', 'convert', 'env')
app.add_config_value('image_converter_args', [], 'env')
return {
'version': 'builtin',
'parallel_read_safe': True,
'parallel_write_safe': True,
}
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