I'm building a site for a friend for free, and am trying to work out a good way for her to be able to easily make updates. I haven't used any CMSs before. I was browsing the web today looking at some, and they all seem way too complicated for what I'm after.

Basically, all I want is a really simple CMS that pulls together HTML snippets in particular subdirectories, and wraps them in header/footer HTML and inserts them into a template page in the appropriate section.

I'm imagining a site layout something like this:

/
/index.php
/blog_template.php
/news_template.php
/blog/
/blog/header.php
/blog/footer.php
/blog/my-first-blog.html
/blog/blogs-rule.html
/blog/...

Say index.php contains div#blog. PHP would wrap each /blog/*.html file in /blog/header.php and blog/footer.php, and insert them into the div#blog as div#blog([0-9]*).

I haven't been able to find anything this basic, and am one step away from throwing something together myself, but I'm a bit short on time at the moment and figured I'd post here first. Has anyone come across something like this?

I don't want any DB, extensions, user accounts, installation, config, updates... just a simple file based solution.

Thanks :)

Forgot to mention - needs to be FOSS and run on Linux!