Lazy load images

This commit is contained in:
Gabriel Augendre 2020-08-25 23:06:12 +02:00
parent 677d752873
commit 67105db5a9
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GPG key ID: 1E693F4CE4AEE7B4
2 changed files with 42 additions and 1 deletions

35
articles/markdown.py Normal file
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@ -0,0 +1,35 @@
from markdown import Markdown
from markdown.extensions import Extension
from markdown.inlinepatterns import (
IMAGE_LINK_RE,
IMAGE_REFERENCE_RE,
ImageInlineProcessor,
ImageReferenceInlineProcessor,
)
class LazyImageInlineProcessor(ImageInlineProcessor):
def handleMatch(self, m, data):
el, match_start, index = super().handleMatch(m, data)
el.set("loading", "lazy")
return el, match_start, index
class LazyImageReferenceInlineProcessor(ImageReferenceInlineProcessor):
def makeTag(self, href, title, text):
el = super().makeTag(href, title, text)
el.set("loading", "lazy")
return el
class LazyLoadingImageExtension(Extension):
def extendMarkdown(self, md: Markdown):
md.inlinePatterns.register(
LazyImageInlineProcessor(IMAGE_LINK_RE, md), "image_link", 150
)
md.inlinePatterns.register(
LazyImageReferenceInlineProcessor(IMAGE_REFERENCE_RE, md),
"image_reference",
140,
)
md.registerExtension(self)

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@ -11,6 +11,8 @@ from django.urls import reverse
from django.utils import timezone from django.utils import timezone
from markdown.extensions.codehilite import CodeHiliteExtension from markdown.extensions.codehilite import CodeHiliteExtension
from articles.markdown import LazyLoadingImageExtension
class User(AbstractUser): class User(AbstractUser):
pass pass
@ -79,7 +81,11 @@ class Article(AdminUrlMixin, models.Model):
def get_formatted_content(self): def get_formatted_content(self):
md = markdown.Markdown( md = markdown.Markdown(
extensions=["extra", CodeHiliteExtension(linenums=False)] extensions=[
"extra",
CodeHiliteExtension(linenums=False),
LazyLoadingImageExtension(),
]
) )
content = self.content content = self.content
content = re.sub(r"(\s)#(\w+)", r"\1\#\2", content) content = re.sub(r"(\s)#(\w+)", r"\1\#\2", content)