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Add intermediate helper imalison:compose-2-argspec

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This macro is usefule when the first function supplied needs to use
special keywords etc.
This commit is contained in:
Ivan Malison 2016-06-22 14:17:59 -07:00
parent 60404e6f78
commit 656e33a64b
1 changed files with 14 additions and 6 deletions
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20
dotfiles/emacs.d/README.org
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@ -400,19 +400,27 @@ The packages in this section provide no functionality on their own, but provide
'arg
`(funcall ,(car funcs) (imalison:compose-helper-unary ,(cdr funcs)))))
#+END_SRC
**** Most performant version supports macros
**** A Version Supporting Macros
#+BEGIN_SRC emacs-lisp
(defmacro imalison:compose-named-functions (arguments &rest funcs)
(defmacro imalison:compose-2 (arguments &rest funcs)
(when (numberp arguments)
(setq arguments
(cl-loop for i from 97 to (+ arguments 96)
collect (intern (char-to-string i)))))
`(imalison:compose-2-argspec ,arguments ,arguments ,@funcs))
(defmacro imalison:compose-2-argspec
(arguments call-arguments &rest funcs)
"Build a new function with NAME that is the composition of FUNCS."
`(lambda ,arguments
(imalison:compose-named-functions-helper ,funcs ,arguments)))
(imalison:compose-2-helper ,funcs ,call-arguments)))
(defmacro imalison:compose-named-functions-helper (funcs arguments)
(defmacro imalison:compose-2-helper (funcs arguments)
"Builds funcalls of FUNCS applied to the arg."
(if (equal (length funcs) 1)
`(,(car funcs) ,@arguments)
`(,(car funcs)
(imalison:compose-named-functions-helper ,(cdr funcs) ,arguments))))
(imalison:compose-2-helper ,(cdr funcs) ,arguments))))
#+END_SRC
*** Prefix Alternatives
Prefix alternatives is a macro that builds a function that selects one of a collection of functions that are provided to the macro based on the value of the prefix argument.
@ -608,7 +616,7 @@ Get route information
#+BEGIN_SRC emacs-lisp
(defun imalison:muni-get-route-ids (route-name &optional direction)
(delete-dups
(mapcar (imalison:compose imalison:car-intern 'intern 'car)
(mapcar (imalison:compose-2 1 intern car)
(s-match-strings-all
"^\\([[:digit:]]\\{1,10\\}\\)"
(shell-command-to-string