Artur Malabarba <arturmalaba...@gmail.com> writes:
> Over at CIDER we're adding a feature where the author of a macro (or
> function) can specify how that macro should be indented by adding an :indent
> metadata to its definition. This way the editor (and other tools, like
> cljfmt) will know what's the proper way of indenting any macro (even those
> custom-defined) without having to hardcode a bajillion names.
One slight disadvantage with this approach is that the indentation can
change depending on the evaluation status of the code. Consider this set
of events inside emacs (I'll get back to Clojure -- it's a general
problem not Emacs specific).
- I open the file lentic.el
- I type M-x indent-buffer
Now, lentic.el depends on m-buffer.el which has some macros with
"declare" forms (the elisp equivalent to the metadata you are talking
off). And these are used in lentic.el.
But I haven't loaded m-buffer.el yet. So the declare forms are not
active, so the m-buffer macros indent according to normal rules. Now, I
do
- M-x eval-buffer
- M-x indent-buffer
This loads lentic.el which loads m-buffer.el including the macros. So,
now I get different indentation patterns. Solution in Emacs space: force
loading on m-buffer.el whenever lentic.el is *opened* rather than loaded.
Using metadata in Clojure the same situation will arise, but will be
somewhat worse. Indentation will be likely to behave differently
depending on whether the REPL is open and the evaluation status of any
macros. Given the slow start up time of the clojure REPL, this is
perhaps a more significant issue. The interesting question then is what
percentage of the time do Clojure developers work *without* a repl
active.
Just a thought.
Phil
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