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+;;; ivy-clipmenu.el --- Emacs client for clipmenu -*- lexical-binding: t -*-
+;; Author: William Carroll <wpcarro@gmail.com>
+
+;;; Commentary:
+;; Ivy integration with the clipboard manager, clipmenu.  Essentially, clipmenu
+;; turns your system clipboard into a list.
+;;
+;; To use this module, you must first install clipmenu and ensure that the
+;; clipmenud daemon is running.  Refer to the installation instructions at
+;; github.com/cdown/clipmenu for those details.
+;;
+;; This module intentionally does not define any keybindings since I'd prefer
+;; not to presume my users' preferences.  Personally, I use EXWM as my window
+;; manager, so I call `exwm-input-set-key' and map it to `ivy-clipmenu/copy'.
+;;
+;; Usually clipmenu integrates with rofi or dmenu.  This Emacs module integrates
+;; with ivy.  Launch this when you want to select a clip.
+;;
+;; Clipmenu itself supports a variety of environment variables that allow you to
+;; customize its behavior.  These variables are respected herein.  If you'd
+;; prefer to customize clipmenu's behavior from within Emacs, refer to the
+;; variables defined in this module.
+;;
+;; For more information:
+;; - See `clipmenu --help`.
+;; - Visit github.com/cdown/clipmenu.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'f)
+(require 's)
+(require 'dash)
+(require 'ivy)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Variables
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defgroup ivy-clipmenu nil
+  "Ivy integration for clipmenu."
+  :group 'ivy)
+
+(defcustom ivy-clipmenu/directory
+  (or (getenv "XDG_RUNTIME_DIR")
+      (getenv "TMPDIR")
+      "/tmp")
+  "Base directory for clipmenu's data."
+  :type 'string
+  :group 'ivy-clipmenu)
+
+(defconst ivy-clipmenu/executable-version 5
+   "The major version number for the clipmenu executable.")
+
+(defconst ivy-clipmenu/cache-directory
+  (f-join ivy-clipmenu/directory
+          (format "clipmenu.%s.%s"
+                  ivy-clipmenu/executable-version
+                  (getenv "USER")))
+  "Directory where the clips are stored.")
+
+(defconst ivy-clipmenu/cache-file-pattern
+  (f-join ivy-clipmenu/cache-directory "line_cache_*")
+  "Glob pattern matching the locations on disk for clipmenu's labels.")
+
+(defcustom ivy-clipmenu/history-length
+  (or (getenv "CM_HISTLENGTH") 25)
+  "Limit the number of clips in the history.
+This value defaults to 25.")
+
+(defvar ivy-clipmenu/history nil
+  "History for `ivy-clipmenu/copy'.")
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Functions
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun ivy-clipmenu/parse-content (x)
+  "Parse the label from the entry in clipmenu's line-cache."
+  (->> (s-split " " x)
+       (-drop 1)
+       (s-join " ")))
+
+(defun ivy-clipmenu/list-clips ()
+  "Return a list of the content of all of the clips."
+  (->> ivy-clipmenu/cache-file-pattern
+       f-glob
+       (-map (lambda (path)
+               (s-split "\n" (f-read path) t)))
+       -flatten
+       (-reject #'s-blank?)
+       (-sort #'string>)
+       (-map #'ivy-clipmenu/parse-content)
+       delete-dups
+       (-take ivy-clipmenu/history-length)))
+
+(defun ivy-clipmenu/checksum (content)
+  "Return the CRC checksum of CONTENT."
+  (s-trim-right
+   (with-temp-buffer
+     (call-process "/bin/bash" nil (current-buffer) nil "-c"
+                   (format "cksum <<<'%s'" content))
+     (buffer-string))))
+
+(defun ivy-clipmenu/line-to-content (line)
+  "Map the chosen LINE from the line cache its content from disk."
+  (->> line
+       ivy-clipmenu/checksum
+       (f-join ivy-clipmenu/cache-directory)
+       f-read))
+
+(defun ivy-clipmenu/do-copy (x)
+  "Copy string, X, to the system clipboard."
+  (kill-new x)
+  (message "[ivy-clipmenu.el] Copied!"))
+
+(defun ivy-clipmenu/copy ()
+  "Use `ivy-read' to select and copy a clip.
+It's recommended to bind this function to a globally available keymap."
+  (interactive)
+  (let ((ivy-sort-functions-alist nil))
+    (ivy-read "Clipmenu: "
+              (ivy-clipmenu/list-clips)
+              :history 'ivy-clipmenu/history
+              :action (lambda (line)
+                        (->> line
+                             ivy-clipmenu/line-to-content
+                             ivy-clipmenu/do-copy)))))
+
+(provide 'ivy-clipmenu)
+;;; ivy-clipmenu.el ends here