Reader macros for easy function currying and composition.

curly

-*- org -*-

#+TITLE: Curly
#+AUTHOR: Maciej Pasternacki
#+EMAIL: maciej@pasternacki.net
#+TEXT: Common Lisp reader macros for easy function currying and composition.
#+OPTIONS: *:nil

* Description
  Curly is set of two reader macros for easy function currying and
  composition.  It was inspired by [[http://www.paulgraham.com/arc.html][Arc]]'s syntax for currying, using
  square brackets.  Curly creates anonymous functions (lambdas) with
  literal function composition instead of trying smarter approach
  (like using (REDUCE #'FUNCALL ...)) so that the compiler is able to
  do more optimizations.

  ASDF system definition is included in curly.asd file.

  Latest version of Curly can be obtained on its GitHub page:
  https://github.com/mpasternacki/curly

** Square bracket macro
   Square bracket macro does simple currying:

   :CURLY> '[foo]
   :(LAMBDA (#:G2705) (FOO #:G2705))
   :CURLY> '[foo bar]
   :(LAMBDA (#:G2706) (FOO BAR #:G2706))
   :CURLY> '[foo bar baz]
   :(LAMBDA (#:G2707) (FOO BAR BAZ #:G2707))

   By using symbol configured by CURLY:*BLANK-ARGUMENT* user can put
   anonymous function's parameter in desired place, not necessarily at
   end of argument list.  By default, blank argument is a single star,
   but it can be set e.g. to underscore to better match Arc:

   :CURLY> '[foo bar * baz]
   :(LAMBDA (#:G2709) (FOO BAR #:G2709 BAZ))
   :CURLY> '[foo * bar baz]
   :(LAMBDA (#:G2710) (FOO #:G2710 BAR BAZ))

   Curly interpretes blank argument only in argument position; blank
   argument in functional position is left untouched:

   :CURLY> '[* foo bar baz]
   :(LAMBDA (#:G2711) (* FOO BAR BAZ #:G2711))
   :CURLY> '[* foo * baz]
   :(LAMBDA (#:G2712) (* FOO #:G2712 BAZ))

** Curly bracket macro
   Curly bracket does function composition, which may be coupled with
   currying.  Let's start from simple composition:

   :CURLY> '{foo bar}
   :(LAMBDA (#:G2714) (FOO (BAR #:G2714)))
   :CURLY> '{foo bar baz}
   :(LAMBDA (#:G2715) (FOO (BAR (BAZ #:G2715))))
   :CURLY> '{foo bar baz quux}
   :(LAMBDA (#:G2716) (FOO (BAR (BAZ (QUUX #:G2716)))))

   And so on, and so on.  When instead of a function name there is a
   list within the braces, this means currying:

   :CURLY> '{foo (bar 23) baz quux}
   :(LAMBDA (#:G2721) (FOO (BAR 23 (BAZ (QUUX #:G2721)))))
   :CURLY> '{foo (bar 16) (baz 23 42) quux}
   :(LAMBDA (#:G2723) (FOO (BAR 16 (BAZ 23 42 (QUUX #:G2723)))))

   Of course, when currying within braces, blank argument can be used
   as well:

   :CURLY> '{foo (bar 16) (baz 23 * 42) quux}
   :(LAMBDA (#:G2724) (FOO (BAR 16 (BAZ 23 (QUUX #:G2724) 42))))
   :CURLY> '{foo (bar 16) (baz * 23 42) quux}
   :(LAMBDA (#:G2725) (FOO (BAR 16 (BAZ (QUUX #:G2725) 23 42)))

* Reference
  All Curly functions, macros and variables are exported from package
  CURLY.

** *BLANK-ARGUMENT*
   Variable: specifies symbol that is used to indicate blank argument
   for currying.  Default value is '*.

** CURLY-READER stream character
   Function: reader macro function for curly braces (composition).

** SQUARE-READER stream character
   Function: reader macro function for square braces (currying).

** MAKE-CURLY-READTABLE &optional (original-readtable *readtable*)
   Function: returns modified copy of ORIGINAL-READTABLE that has
   Curly reader macros turned on.

** ENABLE-CURLY-SYNTAX
   Macro: enable curly syntax for current file.

** DISABLE-CURLY-SYNTAX
   Macro: disable curly syntax for current file.

   Warning: Calling DISABLE-CURLY-SYNTAX when curly syntax is not
   enabled can give funny results.  Also, reading multiple files using
   ENABLE-CURLY-SYNTAX and DISABLE-CURLY-SYNTAX in different threads
   can invoke a disaster.  ENABLE-CURLY-SYNTAX itself is safe.

* Testing
  Unit tests are included in tests.lisp file.  To run test, you need
  FiveAM testing framework along with required Arnesi library from
  [[http://common-lisp.net/project/bese/]].

  To run the tests, simply load curly with ASDF, and then type into
  REPL:
  : (asdf:operate 'asdf:test-op :curly)


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