I recently started a mini-review of various static site generators which is on github, and found that there were a lot of variations between existing solutions.
Some would force you to have a single "layout template" which was used to build your site, while others would allow you to layout/theme/style different sections with different templates.
Almost all static site generators have problems with handling symlinks. For example you might have http://example.com/Images be a symlink to "images" - to ease users memories.
Ultimately I chose to continue using my own templer tool on my main site, and many others, because it lets me do clever things with layouts, variables and similar. The plugin system also allowed me to handle "breadcrumbs" and similar things.
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