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+;;; ivy-helpers.el --- More interfaces to ivy -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; Package-Requires: ((emacs "24.3"))
+
+;;; Commentary:
+;; Hopefully to improve my workflows.
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'tuple)
+(require 'string)
+(require 'cl-lib)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(cl-defun ivy-helpers-kv (prompt kv f)
+  "PROMPT users with the keys in KV and return its corresponding value.
+
+Apply key and value from KV to F."
+  (ivy-read
+   prompt
+   kv
+   :require-match t
+   :action (lambda (entry)
+             (funcall f (car entry) (cdr entry)))))
+
+(defun ivy-helpers-do-run-external-command (cmd)
+  "Execute the specified CMD and notify the user when it finishes."
+  (message "Starting %s..." cmd)
+  (set-process-sentinel
+   (start-process-shell-command cmd nil cmd)
+   (lambda (process event)
+     (when (string= event "finished\n")
+       (message "%s process finished." process)))))
+
+(defun ivy-helpers-list-external-commands ()
+  "Create a list of all external commands available on $PATH."
+  (cl-loop
+   for dir in (split-string (getenv "PATH") path-separator)
+   when (and (file-exists-p dir) (file-accessible-directory-p dir))
+   for lsdir = (cl-loop for i in (directory-files dir t)
+                        for bn = (file-name-nondirectory i)
+                        when (and (not (s-contains? "-wrapped" i))
+                                  (not (member bn completions))
+                                  (not (file-directory-p i))
+                                  (file-executable-p i))
+                        collect bn)
+   append lsdir into completions
+   finally return (sort completions 'string-lessp)))
+
+(defun ivy-helpers-run-external-command ()
+  "Prompts the user with a list of all installed applications to launch."
+  (interactive)
+  (let ((external-commands-list (ivy-helpers-list-external-commands)))
+    (ivy-read "Command:" external-commands-list
+              :require-match t
+              :action #'ivy-helpers-do-run-external-command)))
+
+;;; Code:
+(provide 'ivy-helpers)
+;;; ivy-helpers.el ends here