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[PATCH] Clojure-like syntactic sugar for an anonymous function literal

From: Oleh
Subject: [PATCH] Clojure-like syntactic sugar for an anonymous function literal
Date: Wed, 21 Jan 2015 22:38:22 +0100

Hi all,

This is my first attempt of modifying the C source of Emacs.
The goal is to add a new reader syntax:

    #(foo bar) should translate to (short-lambda (foo bar))

This is in the same way that the `backquote' is working now:

    `(foo bar) translates to (backquote (foo bar))

The `short-lambda' macro is implemented here:

In the simplest form, i.e. one that does not allow multiple or
&rest-style arguments, it can look like this:

    (defmacro short-lambda (x)
      `(lambda (%) ,x))

Even in this simple form, it can sweeten up Elisp a lot:

    (mapc #(put % 'disabled nil)
          '(upcase-region downcase-region narrow-to-region))

With the (less trivial) linked `short-lambda', the following is

    (cl-mapcar #(concat %1 " are " %2)
               '("roses" "violets")
               '("red" "blue"))

Here's a snippet from `org-mode':

    (mapcar (lambda (x)
              (and (member (car x) matchers) (nth 1 x)))

Here's the sweetened code:

    (mapcar #(and (member (car %) matchers) (nth 1 %))

As far as I know, only #("foo" ...) literal is already taken, so #(Z,
where Z is anything but a " is up for grabs, reader-wise.

I hope that you don't view this patch as malarkey. Saving a few chars
while typing and reading is a big deal to a lot of people.  And the
way I see it, this implementation doesn't cost much.


Attachment: 0001-Modify-reader-.-is-short-lambda.patch
Description: Text Data

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