forked from varia/varia.website
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123 lines
4.8 KiB
123 lines
4.8 KiB
"""
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Better Figures & Images
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------------------------
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This plugin:
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- Adds a style="width: ???px; height: auto;" to each image in the content
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- Also adds the width of the contained image to any parent div.figures.
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- If RESPONSIVE_IMAGES == True, also adds style="max-width: 100%;"
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- Corrects alt text: if alt == image filename, set alt = ''
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TODO: Need to add a test.py for this plugin.
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"""
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from __future__ import unicode_literals
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from os import path, access, R_OK
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import os
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from pelican import signals
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from bs4 import BeautifulSoup
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from PIL import Image
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import pysvg.parser
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import logging
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logger = logging.getLogger(__name__)
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def content_object_init(instance):
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if instance._content is not None:
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content = instance._content
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soup = BeautifulSoup(content, 'html.parser')
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for img in soup(['img', 'object']):
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logger.debug('Better Fig. PATH: %s', instance.settings['PATH'])
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if img.name == 'img':
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logger.debug('Better Fig. img.src: %s', img['src'])
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img_path, img_filename = path.split(img['src'])
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else:
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logger.debug('Better Fig. img.data: %s', img['data'])
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img_path, img_filename = path.split(img['data'])
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logger.debug('Better Fig. img_path: %s', img_path)
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logger.debug('Better Fig. img_fname: %s', img_filename)
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# Pelican 3.5+ supports {attach} macro for auto copy, in this use case the content does not exist in output
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# due to the fact it has not been copied, hence we take it from the source (same as current document)
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if img_filename.startswith('{attach}'):
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img_path = os.path.dirname(instance.source_path)
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img_filename = img_filename[8:]
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src = os.path.join(img_path, img_filename)
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else:
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# Strip off {filename}, |filename| or /static
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if img_path.startswith(('{filename}', '|filename|')):
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img_path = img_path[10:]
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elif img_path.startswith('/static'):
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img_path = img_path[7:]
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elif img_path.startswith('data:image'):
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# Image is encoded in-line (not a file).
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continue
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else:
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logger.warning('Better Fig. Error: img_path should start with either {filename}, |filename| or /static')
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# search src path list
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# 1. Build the source image filename from PATH
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# 2. Build the source image filename from STATIC_PATHS
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# if img_path start with '/', remove it.
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img_path = os.path.sep.join([el for el in img_path.split("/") if len(el) > 0])
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# style: {filename}/static/foo/bar.png
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src = os.path.join(instance.settings['PATH'], img_path, img_filename)
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src_candidates = [src]
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# style: {filename}../static/foo/bar.png
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src_candidates += [os.path.join(instance.settings['PATH'], static_path, img_path, img_filename) for static_path in instance.settings['STATIC_PATHS']]
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src_candidates = [f for f in src_candidates if path.isfile(f) and access(f, R_OK)]
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if not src_candidates:
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logger.error('Better Fig. Error: image not found: %s', src)
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logger.debug('Better Fig. Skip src: %s', img_path + '/' + img_filename)
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continue
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src = src_candidates[0]
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logger.debug('Better Fig. src: %s', src)
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# Open the source image and query dimensions; build style string
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try:
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if img.name == 'img':
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im = Image.open(src)
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extra_style = 'width: {}px; height: auto;'.format(im.size[0])
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else:
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svg = pysvg.parser.parse(src)
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extra_style = 'width: {}px; height: auto;'.format(svg.get_width())
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except IOError as e:
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logger.debug('Better Fig. Failed to open: %s', src)
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extra_style = 'width: 100%; height: auto;'
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if 'RESPONSIVE_IMAGES' in instance.settings and instance.settings['RESPONSIVE_IMAGES']:
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extra_style += ' max-width: 100%;'
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if img.get('style'):
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img['style'] += extra_style
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else:
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img['style'] = extra_style
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if img.name == 'img':
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if img['alt'] == img['src']:
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img['alt'] = ''
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fig = img.find_parent('div', 'figure')
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if fig:
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if fig.get('style'):
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fig['style'] += extra_style
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else:
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fig['style'] = extra_style
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instance._content = soup.decode()
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def register():
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signals.content_object_init.connect(content_object_init)
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