Yeah, browsing static code won't show you every aspect of the dynamic runtime context for that code, but that doesn't seem like a fair comparison given we're just talking about a skin for gitweb. Perhaps I don't understand what you're getting at?
(let expander
(fn (f var name body)
`(let ,var (,f ,name)
(after (do ,@body) (close ,var))))
Unindented here. Is the above given its own division? But it wouldn't make much sense to group this by itself, since it's used privately by other functions.
(mac w/infile (var name . body)
" Opens the given file `name' for input, assigning the stream to `var'.
The stream is automatically closed on exit from the `body'.
See also [[w/outfile]] [[w/instring]] [[w/stdin]] [[w/socket]] "
(expander 'infile var name body))
Again, unindented at this point. However, it shares some code with other functions after it.
(mac w/outfile (var name . body)
" Opens the given file `name' for output, assigning the stream to `var'.
The stream is automatically closed on exit from the `body'.
See also [[w/infile]] [[w/appendfile]] [[w/outstring]] [[w/stdout]] "
(expander 'outfile var name body))
... etc.
Of course, we could just define a definition as being divided by unindented non-empty lines ^^.
While we're nitpicking, a set of unindented lines should get grouped together as well. No point having a bunch of single-line separators.
And if using indentation seems too hackish, just balance parens, curlies, etc. And separate by lines containing level-1 brackets. Almost as easy to do, and just as language-agnostic.