forked from colonelpanic/dotfiles
Add a version of compose for named functions
This version is interesting because it works with macros
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@ -468,6 +468,21 @@ Here is a unary version which avoids all the calls to imalison:make-list
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'arg
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`(funcall ,(car funcs) (imalison:compose-helper-unary ,(cdr funcs)))))
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#+END_SRC
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Here is a version that will support macros and requires unary functions after the first one
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#+BEGIN_SRC emacs-lisp
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(defmacro imalison:compose-named-functions (arguments &rest funcs)
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"Build a new function with NAME that is the composition of FUNCS."
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`(lambda ,arguments
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(imalison:compose-named-functions-helper ,funcs ,arguments)))
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(defmacro imalison:compose-named-functions-helper (funcs arguments)
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"Builds funcalls of FUNCS applied to the arg."
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(if (equal (length funcs) 1)
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`(,(car funcs) ,@arguments)
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`(,(car funcs)
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(imalison:compose-named-functions-helper ,(cdr funcs) ,arguments))))
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#+END_SRC
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** prefix-alternatives
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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.
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#+BEGIN_SRC emacs-lisp
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