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+;;; bind-key.el --- A simple way to manage personal keybindings
+
+;; Copyright (c) 2012-2017 John Wiegley
+
+;; Author: John Wiegley <johnw@newartisans.com>
+;; Maintainer: John Wiegley <johnw@newartisans.com>
+;; Created: 16 Jun 2012
+;; Modified: 29 Nov 2017
+;; Version: 2.4
+;; Package-Version: 20210210.1609
+;; Package-Commit: a7422fb8ab1baee19adb2717b5b47b9c3812a84c
+;; Keywords: keys keybinding config dotemacs
+;; URL: https://github.com/jwiegley/use-package
+
+;; 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, 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 gnu emacs; see the file copying.  if not, write to the
+;; free software foundation, inc., 59 temple place - suite 330,
+;; boston, ma 02111-1307, usa.
+
+;;; Commentary:
+
+;; If you have lots of keybindings set in your .emacs file, it can be hard to
+;; know which ones you haven't set yet, and which may now be overriding some
+;; new default in a new emacs version.  This module aims to solve that
+;; problem.
+;;
+;; Bind keys as follows in your .emacs:
+;;
+;;   (require 'bind-key)
+;;
+;;   (bind-key "C-c x" 'my-ctrl-c-x-command)
+;;
+;; If the keybinding argument is a vector, it is passed straight to
+;; `define-key', so remapping a key with `[remap COMMAND]' works as
+;; expected:
+;;
+;;   (bind-key [remap original-ctrl-c-x-command] 'my-ctrl-c-x-command)
+;;
+;; If you want the keybinding to override all minor modes that may also bind
+;; the same key, use the `bind-key*' form:
+;;
+;;   (bind-key* "<C-return>" 'other-window)
+;;
+;; If you want to rebind a key only in a particular keymap, use:
+;;
+;;   (bind-key "C-c x" 'my-ctrl-c-x-command some-other-mode-map)
+;;
+;; To unbind a key within a keymap (for example, to stop your favorite major
+;; mode from changing a binding that you don't want to override everywhere),
+;; use `unbind-key':
+;;
+;;   (unbind-key "C-c x" some-other-mode-map)
+;;
+;; To bind multiple keys at once, or set up a prefix map, a `bind-keys' macro
+;; is provided.  It accepts keyword arguments, please see its documentation
+;; for a detailed description.
+;;
+;; To add keys into a specific map, use :map argument
+;;
+;;    (bind-keys :map dired-mode-map
+;;               ("o" . dired-omit-mode)
+;;               ("a" . some-custom-dired-function))
+;;
+;; To set up a prefix map, use `:prefix-map' and `:prefix' arguments (both are
+;; required)
+;;
+;;    (bind-keys :prefix-map my-customize-prefix-map
+;;               :prefix "C-c c"
+;;               ("f" . customize-face)
+;;               ("v" . customize-variable))
+;;
+;; You can combine all the keywords together.  Additionally,
+;; `:prefix-docstring' can be specified to set documentation of created
+;; `:prefix-map' variable.
+;;
+;; To bind multiple keys in a `bind-key*' way (to be sure that your bindings
+;; will not be overridden by other modes), you may use `bind-keys*' macro:
+;;
+;;    (bind-keys*
+;;     ("C-o" . other-window)
+;;     ("C-M-n" . forward-page)
+;;     ("C-M-p" . backward-page))
+;;
+;; After Emacs loads, you can see a summary of all your personal keybindings
+;; currently in effect with this command:
+;;
+;;   M-x describe-personal-keybindings
+;;
+;; This display will tell you if you've overridden a default keybinding, and
+;; what the default was.  Also, it will tell you if the key was rebound after
+;; your binding it with `bind-key', and what it was rebound it to.
+
+;;; Code:
+
+(require 'cl-lib)
+(require 'easy-mmode)
+
+(defgroup bind-key nil
+  "A simple way to manage personal keybindings"
+  :group 'emacs)
+
+(defcustom bind-key-column-widths '(18 . 40)
+  "Width of columns in `describe-personal-keybindings'."
+  :type '(cons integer integer)
+  :group 'bind-key)
+
+(defcustom bind-key-segregation-regexp
+  "\\`\\(\\(C-[chx] \\|M-[gso] \\)\\([CM]-\\)?\\|.+-\\)"
+  "Regular expression used to divide key sets in the output from
+\\[describe-personal-keybindings]."
+  :type 'regexp
+  :group 'bind-key)
+
+(defcustom bind-key-describe-special-forms nil
+  "If non-nil, extract docstrings from lambdas, closures and keymaps if possible."
+  :type 'boolean
+  :group 'bind-key)
+
+;; Create override-global-mode to force key remappings
+
+(defvar override-global-map (make-keymap)
+  "override-global-mode keymap")
+
+(define-minor-mode override-global-mode
+  "A minor mode so that keymap settings override other modes."
+  t "")
+
+;; the keymaps in `emulation-mode-map-alists' take precedence over
+;; `minor-mode-map-alist'
+(add-to-list 'emulation-mode-map-alists
+             `((override-global-mode . ,override-global-map)))
+
+(defvar personal-keybindings nil
+  "List of bindings performed by `bind-key'.
+
+Elements have the form ((KEY . [MAP]) CMD ORIGINAL-CMD)")
+
+;;;###autoload
+(defmacro bind-key (key-name command &optional keymap predicate)
+  "Bind KEY-NAME to COMMAND in KEYMAP (`global-map' if not passed).
+
+KEY-NAME may be a vector, in which case it is passed straight to
+`define-key'. Or it may be a string to be interpreted as
+spelled-out keystrokes, e.g., \"C-c C-z\". See documentation of
+`edmacro-mode' for details.
+
+COMMAND must be an interactive function or lambda form.
+
+KEYMAP, if present, should be a keymap variable or symbol.
+For example:
+
+  (bind-key \"M-h\" #'some-interactive-function my-mode-map)
+
+  (bind-key \"M-h\" #'some-interactive-function 'my-mode-map)
+
+If PREDICATE is non-nil, it is a form evaluated to determine when
+a key should be bound. It must return non-nil in such cases.
+Emacs can evaluate this form at any time that it does redisplay
+or operates on menu data structures, so you should write it so it
+can safely be called at any time."
+  (let ((namevar (make-symbol "name"))
+        (keyvar (make-symbol "key"))
+        (kmapvar (make-symbol "kmap"))
+        (kdescvar (make-symbol "kdesc"))
+        (bindingvar (make-symbol "binding")))
+    `(let* ((,namevar ,key-name)
+            (,keyvar (if (vectorp ,namevar) ,namevar
+                       (read-kbd-macro ,namevar)))
+            (,kmapvar (or (if (and ,keymap (symbolp ,keymap))
+                              (symbol-value ,keymap) ,keymap)
+                          global-map))
+            (,kdescvar (cons (if (stringp ,namevar) ,namevar
+                               (key-description ,namevar))
+                             (if (symbolp ,keymap) ,keymap (quote ,keymap))))
+            (,bindingvar (lookup-key ,kmapvar ,keyvar)))
+       (let ((entry (assoc ,kdescvar personal-keybindings))
+             (details (list ,command
+                            (unless (numberp ,bindingvar)
+                              ,bindingvar))))
+         (if entry
+             (setcdr entry details)
+           (add-to-list 'personal-keybindings (cons ,kdescvar details))))
+       ,(if predicate
+            `(define-key ,kmapvar ,keyvar
+               '(menu-item "" nil :filter (lambda (&optional _)
+                                            (when ,predicate
+                                              ,command))))
+          `(define-key ,kmapvar ,keyvar ,command)))))
+
+;;;###autoload
+(defmacro unbind-key (key-name &optional keymap)
+  "Unbind the given KEY-NAME, within the KEYMAP (if specified).
+See `bind-key' for more details."
+  (let ((namevar (make-symbol "name"))
+        (kdescvar (make-symbol "kdesc")))
+    `(let* ((,namevar ,key-name)
+            (,kdescvar (cons (if (stringp ,namevar) ,namevar
+                               (key-description ,namevar))
+                             (if (symbolp ,keymap) ,keymap (quote ,keymap)))))
+       (bind-key--remove (if (vectorp ,namevar) ,namevar
+                           (read-kbd-macro ,namevar))
+                         (or (if (and ,keymap (symbolp ,keymap))
+                                 (symbol-value ,keymap) ,keymap)
+                             global-map))
+       (setq personal-keybindings
+             (cl-delete-if (lambda (k) (equal (car k) ,kdescvar))
+                           personal-keybindings))
+       nil)))
+
+(defun bind-key--remove (key keymap)
+  "Remove KEY from KEYMAP.
+
+In contrast to `define-key', this function removes the binding from the keymap."
+  (define-key keymap key nil)
+  ;; Split M-key in ESC key
+  (setq key (mapcan (lambda (k)
+                      (if (and (integerp k) (/= (logand k ?\M-\0) 0))
+                          (list ?\e (logxor k ?\M-\0))
+                        (list k)))
+                    key))
+  ;; Delete single keys directly
+  (if (= (length key) 1)
+      (delete key keymap)
+    ;; Lookup submap and delete key from there
+    (let* ((prefix (vconcat (butlast key)))
+           (submap (lookup-key keymap prefix)))
+      (unless (keymapp submap)
+        (error "Not a keymap for %s" key))
+      (when (symbolp submap)
+        (setq submap (symbol-function submap)))
+      (delete (last key) submap)
+      ;; Delete submap if it is empty
+      (when (= 1 (length submap))
+          (bind-key--remove prefix keymap)))))
+
+;;;###autoload
+(defmacro bind-key* (key-name command &optional predicate)
+  "Similar to `bind-key', but overrides any mode-specific bindings."
+  `(bind-key ,key-name ,command override-global-map ,predicate))
+
+(defun bind-keys-form (args keymap)
+  "Bind multiple keys at once.
+
+Accepts keyword arguments:
+:map MAP               - a keymap into which the keybindings should be
+                         added
+:prefix KEY            - prefix key for these bindings
+:prefix-map MAP        - name of the prefix map that should be created
+                         for these bindings
+:prefix-docstring STR  - docstring for the prefix-map variable
+:menu-name NAME        - optional menu string for prefix map
+:filter FORM           - optional form to determine when bindings apply
+
+The rest of the arguments are conses of keybinding string and a
+function symbol (unquoted)."
+  (let (map
+        doc
+        prefix-map
+        prefix
+        filter
+        menu-name
+        pkg)
+
+    ;; Process any initial keyword arguments
+    (let ((cont t))
+      (while (and cont args)
+        (if (cond ((and (eq :map (car args))
+                        (not prefix-map))
+                   (setq map (cadr args)))
+                  ((eq :prefix-docstring (car args))
+                   (setq doc (cadr args)))
+                  ((and (eq :prefix-map (car args))
+                        (not (memq map '(global-map
+                                         override-global-map))))
+                   (setq prefix-map (cadr args)))
+                  ((eq :prefix (car args))
+                   (setq prefix (cadr args)))
+                  ((eq :filter (car args))
+                   (setq filter (cadr args)) t)
+                  ((eq :menu-name (car args))
+                   (setq menu-name (cadr args)))
+                  ((eq :package (car args))
+                   (setq pkg (cadr args))))
+            (setq args (cddr args))
+          (setq cont nil))))
+
+    (when (or (and prefix-map (not prefix))
+              (and prefix (not prefix-map)))
+      (error "Both :prefix-map and :prefix must be supplied"))
+
+    (when (and menu-name (not prefix))
+      (error "If :menu-name is supplied, :prefix must be too"))
+
+    (unless map (setq map keymap))
+
+    ;; Process key binding arguments
+    (let (first next)
+      (while args
+        (if (keywordp (car args))
+            (progn
+              (setq next args)
+              (setq args nil))
+          (if first
+              (nconc first (list (car args)))
+            (setq first (list (car args))))
+          (setq args (cdr args))))
+
+      (cl-flet
+          ((wrap (map bindings)
+                 (if (and map pkg (not (memq map '(global-map
+                                                   override-global-map))))
+                     `((if (boundp ',map)
+                           ,(macroexp-progn bindings)
+                         (eval-after-load
+                             ,(if (symbolp pkg) `',pkg pkg)
+                           ',(macroexp-progn bindings))))
+                   bindings)))
+
+        (append
+         (when prefix-map
+           `((defvar ,prefix-map)
+             ,@(when doc `((put ',prefix-map 'variable-documentation ,doc)))
+             ,@(if menu-name
+                   `((define-prefix-command ',prefix-map nil ,menu-name))
+                 `((define-prefix-command ',prefix-map)))
+             ,@(if (and map (not (eq map 'global-map)))
+                   (wrap map `((bind-key ,prefix ',prefix-map ,map ,filter)))
+                 `((bind-key ,prefix ',prefix-map nil ,filter)))))
+         (wrap map
+               (cl-mapcan
+                (lambda (form)
+                  (let ((fun (and (cdr form) (list 'function (cdr form)))))
+                    (if prefix-map
+                        `((bind-key ,(car form) ,fun ,prefix-map ,filter))
+                      (if (and map (not (eq map 'global-map)))
+                          `((bind-key ,(car form) ,fun ,map ,filter))
+                        `((bind-key ,(car form) ,fun nil ,filter))))))
+                first))
+         (when next
+           (bind-keys-form (if pkg
+                               (cons :package (cons pkg next))
+                             next) map)))))))
+
+;;;###autoload
+(defmacro bind-keys (&rest args)
+  "Bind multiple keys at once.
+
+Accepts keyword arguments:
+:map MAP               - a keymap into which the keybindings should be
+                         added
+:prefix KEY            - prefix key for these bindings
+:prefix-map MAP        - name of the prefix map that should be created
+                         for these bindings
+:prefix-docstring STR  - docstring for the prefix-map variable
+:menu-name NAME        - optional menu string for prefix map
+:filter FORM           - optional form to determine when bindings apply
+
+The rest of the arguments are conses of keybinding string and a
+function symbol (unquoted)."
+  (macroexp-progn (bind-keys-form args nil)))
+
+;;;###autoload
+(defmacro bind-keys* (&rest args)
+  (macroexp-progn (bind-keys-form args 'override-global-map)))
+
+(defun get-binding-description (elem)
+  (cond
+   ((listp elem)
+    (cond
+     ((memq (car elem) '(lambda function))
+      (if (and bind-key-describe-special-forms
+               (stringp (nth 2 elem)))
+          (nth 2 elem)
+        "#<lambda>"))
+     ((eq 'closure (car elem))
+      (if (and bind-key-describe-special-forms
+               (stringp (nth 3 elem)))
+          (nth 3 elem)
+        "#<closure>"))
+     ((eq 'keymap (car elem))
+      "#<keymap>")
+     (t
+      elem)))
+   ;; must be a symbol, non-symbol keymap case covered above
+   ((and bind-key-describe-special-forms (keymapp elem))
+    (let ((doc (get elem 'variable-documentation)))
+      (if (stringp doc) doc elem)))
+   ((symbolp elem)
+    elem)
+   (t
+    "#<byte-compiled lambda>")))
+
+(defun compare-keybindings (l r)
+  (let* ((regex bind-key-segregation-regexp)
+         (lgroup (and (string-match regex (caar l))
+                      (match-string 0 (caar l))))
+         (rgroup (and (string-match regex (caar r))
+                      (match-string 0 (caar r))))
+         (lkeymap (cdar l))
+         (rkeymap (cdar r)))
+    (cond
+     ((and (null lkeymap) rkeymap)
+      (cons t t))
+     ((and lkeymap (null rkeymap))
+      (cons nil t))
+     ((and lkeymap rkeymap
+           (not (string= (symbol-name lkeymap) (symbol-name rkeymap))))
+      (cons (string< (symbol-name lkeymap) (symbol-name rkeymap)) t))
+     ((and (null lgroup) rgroup)
+      (cons t t))
+     ((and lgroup (null rgroup))
+      (cons nil t))
+     ((and lgroup rgroup)
+      (if (string= lgroup rgroup)
+          (cons (string< (caar l) (caar r)) nil)
+        (cons (string< lgroup rgroup) t)))
+     (t
+      (cons (string< (caar l) (caar r)) nil)))))
+
+;;;###autoload
+(defun describe-personal-keybindings ()
+  "Display all the personal keybindings defined by `bind-key'."
+  (interactive)
+  (with-output-to-temp-buffer "*Personal Keybindings*"
+    (princ (format (concat "Key name%s Command%s Comments\n%s %s "
+                           "---------------------\n")
+                   (make-string (- (car bind-key-column-widths) 9) ? )
+                   (make-string (- (cdr bind-key-column-widths) 8) ? )
+                   (make-string (1- (car bind-key-column-widths)) ?-)
+                   (make-string (1- (cdr bind-key-column-widths)) ?-)))
+    (let (last-binding)
+      (dolist (binding
+               (setq personal-keybindings
+                     (sort personal-keybindings
+                           (lambda (l r)
+                             (car (compare-keybindings l r))))))
+
+        (if (not (eq (cdar last-binding) (cdar binding)))
+            (princ (format "\n\n%s: %s\n%s\n\n"
+                           (cdar binding) (caar binding)
+                           (make-string (+ 21 (car bind-key-column-widths)
+                                           (cdr bind-key-column-widths)) ?-)))
+          (if (and last-binding
+                   (cdr (compare-keybindings last-binding binding)))
+              (princ "\n")))
+
+        (let* ((key-name (caar binding))
+               (at-present (lookup-key (or (symbol-value (cdar binding))
+                                           (current-global-map))
+                                       (read-kbd-macro key-name)))
+               (command (nth 1 binding))
+               (was-command (nth 2 binding))
+               (command-desc (get-binding-description command))
+               (was-command-desc (and was-command
+                                      (get-binding-description was-command)))
+               (at-present-desc (get-binding-description at-present))
+               )
+          (let ((line
+                 (format
+                  (format "%%-%ds%%-%ds%%s\n" (car bind-key-column-widths)
+                          (cdr bind-key-column-widths))
+                  key-name (format "`%s\'" command-desc)
+                  (if (string= command-desc at-present-desc)
+                      (if (or (null was-command)
+                              (string= command-desc was-command-desc))
+                          ""
+                        (format "was `%s\'" was-command-desc))
+                    (format "[now: `%s\']" at-present)))))
+            (princ (if (string-match "[ \t]+\n" line)
+                       (replace-match "\n" t t line)
+                     line))))
+
+        (setq last-binding binding)))))
+
+(provide 'bind-key)
+
+;; Local Variables:
+;; outline-regexp: ";;;\\(;* [^\s\t\n]\\|###autoload\\)\\|("
+;; indent-tabs-mode: nil
+;; End:
+
+;;; bind-key.el ends here