Hi Laurent,
I think that pprint might be a good foundation for what you are doing,
but there are a couple of issues that need to be dealt with first.
First, pprint works directly on Clojure objects and not strings, so
the code will need to be read first.
Second, the Clojure reader is lossy - it strips comments, metadata
tags (#^{}) and expands forms like backquote and reader time
evaluation before passing you the result.
The first thing I would do is look at making a modified reader that
could read chunks of s-expression and pass back raw data. In a perfect
world, this reader would be much more resistant to syntax problems
(for example by "assuming" extra opening or closing brackets of
various types).
Then I would look at how I was going to attach the pprint to the
editor. In practice, I think you want the reformatting to be very
incremental, working on small chunks of code at a time, but you know
better than I.
Using the code dispatch in pretty printing should be pretty easy once
you have this infrastructure. You'll probably want to customize it a
little, but that's fairly straightforward. You'll also probably want
to "clean up" any syntax corrections you made. I might think about
adding metadata to the read structure and then using that in the
dispatch to skip writing open parens that weren't really there, for
instance.
I've been thinking about doing all this, but it's not at the top of my
list right now (working on a new contrib autodoc tool and making
pprint cleaner and faster plus my real job!). But I'm happy to discuss/
help in the short term.
HTH,
Tom
On Jun 30, 7:08 am, Laurent PETIT <laurent.pe...@gmail.com> wrote:
> Hi all,
>
> I want to add source code formatting / auto-indenting to the clojure
> plugin for eclipse.
>
> I had asked other IDE plugin creators, and it seems that they
> leveraged the specifics of their respective platforms to do so. So I
> have nothing substantial to "steal from them" not requiring a fair
> amount of rework :-)
>
> I'm now facing the following two paths :
>
> * try to leverage Eclipse's way of doing clojure source code
> formatting / auto-indenting and create yet another lib for doing that
> very specifically
>
> * try to do it in clojure so that it can also be used as a standalone
> command-line / whatever utility for mass source code reformatting ...
>
> So what is my question ? :-)
>
> Do you know if pprint lib now is (or will in a near future) be able to
> handle this use case : that is not only formatting clojure code
> returned by the reader, but also clojure code as string, and
> potentially broken code (and so it would have to preserve comments,
> literal metadata in the exact form they were written, etc.)
>
> Do you know whether there is another existing effort to do this in
> plain clojure, or at least sufficiently independtly from an existing
> IDE framework so that I can painlessly reuse it ?
>
> Thanks in advance,
>
> --
> Laurent
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