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premailer.py - Transform CSS into line style attributes with lxml.html
style text, premailer, css, style, lxml, test_premailer, emails, newsletter
11th of July 2009
By blogging about it I can pretty much guarantee that someone will comment and say "Hey, why didn't you use the pypi/alreadyexists package which does the same thing but better". I couldn't find one after a quick search and I felt the hacker mood creeping up on my begging me to (re)invent it.
premailer.py takes a HTML page, finds all CSS blocks and transforms these into style attributes. For example, from this:
<head>
<title>Test</title>
<style>
h1, h2 { color:red; }
strong {
text-decoration:none
}
</style>
</head>
<body>
<h1>Hi!</h1>
<p><strong>Yes!</strong></p>
</body>
</html>
You get this:
<head>
<title>Test</title>
</head>
<body>
<h1 style="color:red">Hi!</h1>
<p><strong style="text-decoration:none">Yes!</strong></p>
</body>
</html>
Why is this useful? When you're writing HTML emails. Like this newsletter app that I'm working on.
I just wrote it late yesterday and it needs lots of work to impress but for the moment it works for me. If I take the time to tidy it up properly I'll turn it into a package. Assuming there isn't one already :)
UPDATE
No available on github.com and as a PyPi package
Comment
I've been looking for something like this to use as a PyBlosxom plugin to inline styles in the RSS feed. And when I say "looking", I mean "posting a question and waiting for lazyweb to come up with an answer". So, thanks ;-)
What is the licence of your code?
No licence yet but I'm guessing something very forgiving. I've made a much improved version but haven't uploaded it yet.
I guess I'll stick it on pypi
funny I have done the same a few weeks ago. I'll compare with your module if there is anything I can add.
XIST includes a function for doing this. An online version of the CSS inliner is available from http://lltools.appspot.com/CSSInliner.html