preprocess: a multi-language preprocessor
There are millions of templating systems out there (most of them developed for the web). This isn’t one of those, though it does share some basics: a markup syntax for templates that are processed to give resultant text output. The main difference with preprocess.py is that its syntax is hidden in comments (whatever the syntax for comments maybe in the target filetype) so that the file can still have valid syntax. A comparison with the C preprocessor is more apt.