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Add option to lazyload images

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This commit is contained in:
Knoch 2020-06-10 17:12:49 +02:00
parent a355060d91
commit 4860306bb6
2 changed files with 28 additions and 7 deletions
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13
helper.py
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@ -1,6 +1,7 @@
import os import os
import stat import stat
import yaml import yaml
import re
# Calls a YAML parser for the given relative path inside the presentation root # Calls a YAML parser for the given relative path inside the presentation root
# directory. Returns a dictionary with the YAML content. # directory. Returns a dictionary with the YAML content.
@ -29,4 +30,14 @@ def insert_metadata(content, root, lang):
# Retrieve the modification time for a given file. # Retrieve the modification time for a given file.
def get_modification_time(path): def get_modification_time(path):
return os.stat(path)[stat.ST_MTIME] return os.stat(path)[stat.ST_MTIME]
# Replace the "src" attribute on images by "data-src".
# Should be done after caching because fragments#defragmentize requires
# valid XHTML and data-src causes problems with that.
# Also: Toggling lazyload is easier this way.
def add_lazyload(source, lazyload_images):
if lazyload_images:
return re.sub(r'<img(.*)src=', r'<img\1data-src=', source)
else:
return source

22
main.py
View File

@ -10,28 +10,38 @@ import helper
# Compiles a presentation in the given language from the given directory and # Compiles a presentation in the given language from the given directory and
# stores it in a corresponding slides.lang.html file inside the same directory. # stores it in a corresponding slides.lang.html file inside the same directory.
def compile(root, language='en', force_recompile=False):
def compile(root, language='en', force_recompile=False, lazyload_images=False):
wrapper = open(os.path.join(root, 'layouts/root.html'), 'r').read() wrapper = open(os.path.join(root, 'layouts/root.html'), 'r').read()
compiled_chapters = chapters.compile_chapters(root, language, force_recompile) compiled_chapters = chapters.compile_chapters(root, language, force_recompile)
wrapper = wrapper.replace('@slides', compiled_chapters) wrapper = wrapper.replace('@slides', compiled_chapters)
wrapper = helper.insert_metadata(wrapper, root, language) wrapper = helper.insert_metadata(wrapper, root, language)
wrapper = fragments.defragmentize(wrapper) wrapper = fragments.defragmentize(wrapper)
wrapper = helper.add_lazyload(wrapper, lazyload_images)
with open(os.path.join(root, 'slides.' + language + '.html'), 'w+') as output: with open(os.path.join(root, 'slides.' + language + '.html'), 'w+') as output:
output.write(wrapper) output.write(wrapper)
print('done') print('done')
if __name__ == '__main__': if __name__ == '__main__':
parser = argparse.ArgumentParser() parser = argparse.ArgumentParser()
parser.add_argument("rootdirectory", help="your project's root directory") parser.add_argument("rootdirectory", help="your project's root directory")
parser.add_argument("-l", "--language", default="all", help="the presentation language (default: all)") parser.add_argument("-l", "--language", default="all",
parser.add_argument("-f", "--force-recompile", action='store_true', help="recompiling the entire presentation without caches") help="the presentation language (default: all)")
parser.add_argument("-f", "--force-recompile", action='store_true',
help="recompile the entire presentation without caches")
parser.add_argument("-i", "--lazyload-images", action='store_true',
help="replace all images' src attributes by data-src for image lazyloading")
args = parser.parse_args() args = parser.parse_args()
force_recompile = False or args.force_recompile force_recompile = False or args.force_recompile
lazyload_images = False or args.lazyload_images
if args.language == "all": if args.language == "all":
for language in helper.get_available_languages(args.rootdirectory): for language in helper.get_available_languages(args.rootdirectory):
compile(args.rootdirectory, language=language, force_recompile=force_recompile) compile(args.rootdirectory, language=language,
force_recompile=force_recompile, lazyload_images=lazyload_images)
else: else:
compile(args.rootdirectory, language=args.language, force_recompile=force_recompile) compile(args.rootdirectory, language=args.language,
force_recompile=force_recompile, lazyload_images=lazyload_images)