Is there a default / official / standard Vim indentation file for TeX, or just best practices for TeX source indentation?

Question

If you see here, the author mentions an "official version" of an indentation script from Johannes Zellner. The link is broken and while there are traces of Zellner all over the interwebs, I can't find the script.

Maybe there is a more up to date, somehow "official" (e.g. endorsed by TUG or some community, such as this one!) script for TeX indentation in Vim? (Or more particularly, in Vim+Latex-Suite, not that that really should make a difference?)

If not, I'll probably customize Tanzler's script, in which case, my question becomes "what are the best practices for TeX source indentation"?

I'm inclined to do

First sentence of new paragraph
    continuation of first sentence.
    Second sentence of paragraph
        continuation of second sentence.
    Third sentence of paragraph
        continuation.
    \begin{environment}
        \item First item
                continuation of first item
        \item Second item
    \end{environment}

etc., but if there are established best practices for TeX source indentation, I will follow them instead.

EDIT: Screenshots illustrating @J.C.Salomon 's explanation.

My original way:

Suggested better way:

Answer 1

There are no real standards, but here are some tips I’ve found handy:

Don’t indent parts of a paragraph, but do break lines between sentences and after significant phrases within a sentence. As I posted at https://tex.stackexchange.com/a/64538/2966, this makes it easier for small edits to have small diffs. (You are using a VCS, aren’t you?) To exaggerate my own tendency toward long sentences (which benefit even more from this tip), here’s an example:

I tend toward long sentences with many dependent clauses,
and my rewrites often combine or split these,
so standard advice
about breaking lines at sentence boundaries
is not quite enough for me;
I’ve therefore gone beyond those tips,
all the way to writing my prose as if it were blank verse:
breaking lines at most punctuation points
and at other phrase boundaries.

For readability, indent the content of most environments. The small ones, at least; indenting everything between \begin{document} and \end{document} is rather pointless. Spaces or tabs, or the depth of the indent, are all up to you. Just stay consistent within a document.

(Expl3 code does have a more well-defined indentation style. If you’re playing with Expl3 code, you know what it looks like. Follow that style religiously, or your code will be unreadable.)