Hi there, I'm a C++/Python refugee, new to D.
clang-format seems to do a pretty good job with both of these.
Comments seem to be intact unless they're too long, then
they're wrapped. It seems to wrap at a space or other
non-identifier character. Same thing with expressions that are
too long.
I would love such a tool for D, especially based on the ideas of
clang-format. I first heard about clang-format from a talk by
Google's Chandler Carruth: the way he said it, the LLVM guys
looked at what their C++ programmers wasted the most time on, and
it turned out to be whitespace, surprisingly enough. So they
implemented was is essentially LaTeX for source code (optimal
placement of spaces and line breaks using Djikstra's algorithm,
the works). And he said it changed the way he codes, and at that
point I had to go get it, and I 100% agree with him: it's awesome
to have.
It works with Vim, Emacs, Visual Studio, Sublime, etc., because
it provides a simple Python wrapper to the executable that
anything can call any time to format any code. It works with
C/C++, Objective-C, and Javascript; when I discovered it could do
JavaScript, my use of that language rose substantially (could be
coincidence :).
Reading some of the discussion here about whether to integrate it
into the compiler, etc., makes me realize that one of the nice
things about clang-format is real-time interactivity, i.e., I can
type-type-type code quickly and without bothering with
whitespace, just getting the idea out of my head and into the
editor, then when I reach a breathing space I can hit a keycombo,
and my editor reformats the block I just typed. I find that the
hits to my flow are much smaller than having to do this manually,
and I think that's what Carruth meant when he said it changed his
coding.
Another nice thing about it is that it's fully parameterized (how
many spaces, whether to indent this, what penalty to assign that,
etc., example at [1]). It can search the current and parent
directories for a .clang-format file with those parameters. It
can also generate stock .clang-format files conforming to various
coding styles, viz., LLVM, Google, Mozilla, WebKit, & Chromium. I
throw this into my Git repos; happiness ensues.
Hope this helps outline the paths others have taken!
[1] Example Javascript .clang-format file:
https://github.com/fasiha/kanjiwild/blob/gh-pages/.clang-format
