[slime-devel] [patch] a way to specify custom Emacs indentation right in the Lisp source

[Michael Livshin]

hi all,

I find that sometimes the usual Slime way of determining macro
indentation based on the position of the &BODY parameter in the
argument list is not quite enough.

for example: if the body of a certain macro is really a list of
function bindings, then one would like those bindings to be indented
properly.  as it happens, Emacs (or rather
common-lisp-indent-function) can be told exactly how to do that, but
this information cannot be expressed by the macro argument list alone.

the attached patch adds a way to define and access custom indentation
specifications like this:

<example>
(defmacro my-macro (name (&rest args) &body function-bindings)
  ...)

#+swank
(setf (swank:emacs-indentation 'my-macro)
      '(6 4 (&whole 2 &rest (&whole 1 &lambda &body))))
</example>

[ which won't work exactly as written, of course, because unfortunately
  Swank does not push anything onto *FEATURES*... ]

thanks,
--m

    * swank.lisp (*emacs-indentation*): New hash table, used to hold
    custom indentation specs.
    (emacs-indentation): Accessor for the above.
    (symbol-indentation): Use it.

    * slime.el (slime-clean-indent-spec): New function, removes CL
    package prefixes from symbols sent from Lisp.
    (slime-handle-indentation-update): Use it.

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