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+;;; dash-functional.el --- Collection of useful combinators for Emacs Lisp  -*- lexical-binding: t -*-
+
+;; Copyright (C) 2013-2014 Free Software Foundation, Inc.
+
+;; Authors: Matus Goljer <matus.goljer@gmail.com>
+;;          Magnar Sveen <magnars@gmail.com>
+;; Version: 1.2.0
+;; Package-Version: 20180107.1618
+;; Package-Requires: ((dash "2.0.0") (emacs "24"))
+;; Keywords: lisp functions combinators
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; Collection of useful combinators for Emacs Lisp
+;;
+;; See documentation on https://github.com/magnars/dash.el#functions
+
+;;; Code:
+
+(require 'dash)
+
+(defun -partial (fn &rest args)
+  "Takes a function FN and fewer than the normal arguments to FN,
+and returns a fn that takes a variable number of additional ARGS.
+When called, the returned function calls FN with ARGS first and
+then additional args."
+  (apply 'apply-partially fn args))
+
+(defun -rpartial (fn &rest args)
+  "Takes a function FN and fewer than the normal arguments to FN,
+and returns a fn that takes a variable number of additional ARGS.
+When called, the returned function calls FN with the additional
+args first and then ARGS."
+  (lambda (&rest args-before) (apply fn (append args-before args))))
+
+(defun -juxt (&rest fns)
+  "Takes a list of functions and returns a fn that is the
+juxtaposition of those fns. The returned fn takes a variable
+number of args, and returns a list containing the result of
+applying each fn to the args (left-to-right)."
+  (lambda (&rest args) (mapcar (lambda (x) (apply x args)) fns)))
+
+(defun -compose (&rest fns)
+  "Takes a list of functions and returns a fn that is the
+composition of those fns. The returned fn takes a variable
+number of arguments, and returns the result of applying
+each fn to the result of applying the previous fn to
+the arguments (right-to-left)."
+  (lambda (&rest args)
+    (car (-reduce-r-from (lambda (fn xs) (list (apply fn xs)))
+                         args fns))))
+
+(defun -applify (fn)
+  "Changes an n-arity function FN to a 1-arity function that
+expects a list with n items as arguments"
+  (apply-partially 'apply fn))
+
+(defun -on (operator transformer)
+  "Return a function of two arguments that first applies
+TRANSFORMER to each of them and then applies OPERATOR on the
+results (in the same order).
+
+In types: (b -> b -> c) -> (a -> b) -> a -> a -> c"
+  (lambda (x y) (funcall operator (funcall transformer x) (funcall transformer y))))
+
+(defun -flip (func)
+  "Swap the order of arguments for binary function FUNC.
+
+In types: (a -> b -> c) -> b -> a -> c"
+  (lambda (x y) (funcall func y x)))
+
+(defun -const (c)
+  "Return a function that returns C ignoring any additional arguments.
+
+In types: a -> b -> a"
+  (lambda (&rest _) c))
+
+(defmacro -cut (&rest params)
+  "Take n-ary function and n arguments and specialize some of them.
+Arguments denoted by <> will be left unspecialized.
+
+See SRFI-26 for detailed description."
+  (let* ((i 0)
+         (args (mapcar (lambda (_) (setq i (1+ i)) (make-symbol (format "D%d" i)))
+                       (-filter (-partial 'eq '<>) params))))
+    `(lambda ,args
+       ,(let ((body (--map (if (eq it '<>) (pop args) it) params)))
+          (if (eq (car params) '<>)
+              (cons 'funcall body)
+            body)))))
+
+(defun -not (pred)
+  "Take a unary predicate PRED and return a unary predicate
+that returns t if PRED returns nil and nil if PRED returns
+non-nil."
+  (lambda (x) (not (funcall pred x))))
+
+(defun -orfn (&rest preds)
+  "Take list of unary predicates PREDS and return a unary
+predicate with argument x that returns non-nil if at least one of
+the PREDS returns non-nil on x.
+
+In types: [a -> Bool] -> a -> Bool"
+  (lambda (x) (-any? (-cut funcall <> x) preds)))
+
+(defun -andfn (&rest preds)
+  "Take list of unary predicates PREDS and return a unary
+predicate with argument x that returns non-nil if all of the
+PREDS returns non-nil on x.
+
+In types: [a -> Bool] -> a -> Bool"
+  (lambda (x) (-all? (-cut funcall <> x) preds)))
+
+(defun -iteratefn (fn n)
+  "Return a function FN composed N times with itself.
+
+FN is a unary function.  If you need to use a function of higher
+arity, use `-applify' first to turn it into a unary function.
+
+With n = 0, this acts as identity function.
+
+In types: (a -> a) -> Int -> a -> a.
+
+This function satisfies the following law:
+
+  (funcall (-iteratefn fn n) init) = (-last-item (-iterate fn init (1+ n)))."
+  (lambda (x) (--dotimes n (setq x (funcall fn x))) x))
+
+(defun -counter (&optional beg end inc)
+  "Return a closure that counts from BEG to END, with increment INC.
+
+The closure will return the next value in the counting sequence
+each time it is called, and nil after END is reached. BEG
+defaults to 0, INC defaults to 1, and if END is nil, the counter
+will increment indefinitely.
+
+The closure accepts any number of arguments, which are discarded."
+  (let ((inc (or inc 1))
+        (n (or beg 0)))
+    (lambda (&rest _)
+      (when (or (not end) (< n end))
+        (prog1 n
+          (setq n (+ n inc)))))))
+
+(defvar -fixfn-max-iterations 1000
+  "The default maximum number of iterations performed by `-fixfn'
+  unless otherwise specified.")
+
+(defun -fixfn (fn &optional equal-test halt-test)
+  "Return a function that computes the (least) fixpoint of FN.
+
+FN must be a unary function. The returned lambda takes a single
+argument, X, the initial value for the fixpoint iteration. The
+iteration halts when either of the following conditions is satisified:
+
+ 1. Iteration converges to the fixpoint, with equality being
+    tested using EQUAL-TEST. If EQUAL-TEST is not specified,
+    `equal' is used. For functions over the floating point
+    numbers, it may be necessary to provide an appropriate
+    appoximate comparsion test.
+
+ 2. HALT-TEST returns a non-nil value. HALT-TEST defaults to a
+    simple counter that returns t after `-fixfn-max-iterations',
+    to guard against infinite iteration. Otherwise, HALT-TEST
+    must be a function that accepts a single argument, the
+    current value of X, and returns non-nil as long as iteration
+    should continue. In this way, a more sophisticated
+    convergence test may be supplied by the caller.
+
+The return value of the lambda is either the fixpoint or, if
+iteration halted before converging, a cons with car `halted' and
+cdr the final output from HALT-TEST.
+
+In types: (a -> a) -> a -> a."
+  (let ((eqfn   (or equal-test 'equal))
+    (haltfn (or halt-test
+            (-not
+              (-counter 0 -fixfn-max-iterations)))))
+    (lambda (x)
+      (let ((re (funcall fn x))
+        (halt? (funcall haltfn x)))
+    (while (and (not halt?) (not (funcall eqfn x re)))
+      (setq x     re
+        re    (funcall fn re)
+        halt? (funcall haltfn re)))
+    (if halt? (cons 'halted halt?)
+      re)))))
+
+(defun -prodfn (&rest fns)
+  "Take a list of n functions and return a function that takes a
+list of length n, applying i-th function to i-th element of the
+input list.  Returns a list of length n.
+
+In types (for n=2): ((a -> b), (c -> d)) -> (a, c) -> (b, d)
+
+This function satisfies the following laws:
+
+  (-compose (-prodfn f g ...) (-prodfn f\\=' g\\=' ...)) = (-prodfn (-compose f f\\=') (-compose g g\\=') ...)
+  (-prodfn f g ...) = (-juxt (-compose f (-partial \\='nth 0)) (-compose g (-partial \\='nth 1)) ...)
+  (-compose (-prodfn f g ...) (-juxt f\\=' g\\=' ...)) = (-juxt (-compose f f\\=') (-compose g g\\=') ...)
+  (-compose (-partial \\='nth n) (-prod f1 f2 ...)) = (-compose fn (-partial \\='nth n))"
+  (lambda (x) (-zip-with 'funcall fns x)))
+
+(provide 'dash-functional)
+
+;;; dash-functional.el ends here