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;;; helm-ring.el --- kill-ring, mark-ring, and register browsers for helm. -*- lexical-binding: t -*-
;; Copyright (C) 2012 ~ 2016 Thierry Volpiatto <>
;; 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
;; 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 <>.
;;; Code:
(require 'cl-lib)
(require 'helm)
(require 'helm-utils)
(require 'helm-help)
(require 'helm-elisp)
(declare-function undo-tree-restore-state-from-register "ext:undo-tree.el" (register))
(defgroup helm-ring nil
"Ring related Applications and libraries for Helm."
:group 'helm)
(defcustom helm-kill-ring-threshold 3
"Minimum length of a candidate to be listed by `helm-source-kill-ring'."
:type 'integer
:group 'helm-ring)
(defcustom helm-kill-ring-max-lines-number 5
"Max number of lines displayed per candidate in kill-ring browser.
If nil or zero (disabled), don't truncate candidate, show all."
:type '(choice (const :tag "Disabled" nil)
(integer :tag "Max number of lines"))
:group 'helm-ring)
(defcustom helm-register-max-offset 160
"Max size of string register entries before truncating."
:group 'helm-ring
:type 'integer)
(defcustom helm-kill-ring-actions
'(("Yank" . helm-kill-ring-action)
("Delete" . (lambda (_candidate)
(cl-loop for cand in (helm-marked-candidates)
do (setq kill-ring
(delete cand kill-ring))))))
"List of actions for kill ring source."
:group 'helm-ring
:type '(alist :key-type string :value-type function))
;;; Kill ring
(defvar helm-kill-ring-map
(let ((map (make-sparse-keymap)))
(set-keymap-parent map helm-map)
(define-key map (kbd "M-y") 'helm-next-line)
(define-key map (kbd "M-u") 'helm-previous-line)
"Keymap for `helm-show-kill-ring'.")
(defvar helm-source-kill-ring
(helm-build-sync-source "Kill Ring"
:init (lambda () (helm-attrset 'last-command last-command))
:candidates #'helm-kill-ring-candidates
:filtered-candidate-transformer #'helm-kill-ring-transformer
:action 'helm-kill-ring-actions
:persistent-action (lambda (_candidate) (ignore))
:persistent-help "DoNothing"
:keymap helm-kill-ring-map
:migemo t
:multiline t)
"Source for browse and insert contents of kill-ring.")
(defun helm-kill-ring-candidates ()
(cl-loop for kill in (helm-fast-remove-dups kill-ring :test 'equal)
unless (or (< (length kill) helm-kill-ring-threshold)
(string-match "\\`[\n[:blank:]]+\\'" kill))
collect kill))
(defun helm-kill-ring-transformer (candidates _source)
"Display only the `helm-kill-ring-max-lines-number' lines of candidate."
(cl-loop for i in candidates
when (get-text-property 0 'read-only i)
do (set-text-properties 0 (length i) '(read-only nil) i)
for nlines = (with-temp-buffer (insert i) (count-lines (point-min) (point-max)))
if (and helm-kill-ring-max-lines-number
(> nlines helm-kill-ring-max-lines-number))
collect (cons
(insert i)
(goto-char (point-min))
(forward-line helm-kill-ring-max-lines-number)
"[...]")) i)
else collect i))
(defun helm-kill-ring-action (str)
"Insert STR in `kill-ring' and set STR to the head.
If this action is executed just after `yank',
replace with STR as yanked string."
(setq kill-ring (delete str kill-ring))
;; Adding a `delete-selection' property
;; to `helm-kill-ring-action' is not working
;; because `this-command' will be `helm-maybe-exit-minibuffer',
;; so use this workaround (Issue #1520).
(when (and (region-active-p) delete-selection-mode)
(delete-region (region-beginning) (region-end)))
(if (not (eq (helm-attr 'last-command helm-source-kill-ring) 'yank))
(insert-for-yank str)
;; from `yank-pop'
(let ((inhibit-read-only t)
(before (< (point) (mark t))))
(if before
(funcall (or yank-undo-function 'delete-region) (point) (mark t))
(funcall (or yank-undo-function 'delete-region) (mark t) (point)))
(setq yank-undo-function nil)
(set-marker (mark-marker) (point) helm-current-buffer)
(insert-for-yank str)
;; Set the window start back where it was in the yank command,
;; if possible.
(set-window-start (selected-window) yank-window-start t)
(when before
;; This is like exchange-point-and-mark, but doesn't activate the mark.
;; It is cleaner to avoid activation, even though the command
;; loop would deactivate the mark because we inserted text.
(goto-char (prog1 (mark t)
(set-marker (mark-marker) (point) helm-current-buffer))))))
(kill-new str)))
;;;; <Mark ring>
;; DO NOT use these sources with other sources use
;; the commands `helm-mark-ring', `helm-global-mark-ring' or
;; `helm-all-mark-rings' instead.
(defun helm-mark-ring-line-string-at-pos (pos)
"Return line string at position POS."
(goto-char pos)
(forward-line 0)
(let ((line (car (split-string (thing-at-point 'line) "[\n\r]"))))
(if (string= "" line)
(defun helm-mark-ring-get-candidates ()
(cl-loop with marks = (if (mark t) (cons (mark-marker) mark-ring) mark-ring)
for i in marks
with max-line-number = (line-number-at-pos (point-max))
with width = (length (number-to-string max-line-number))
for m = (format (concat "%" (number-to-string width) "d: %s")
(line-number-at-pos i)
(helm-mark-ring-line-string-at-pos i))
unless (and recip (member m recip))
collect m into recip
finally return recip)))
(defvar helm-source-mark-ring
(helm-build-sync-source "mark-ring"
:candidates #'helm-mark-ring-get-candidates
:action '(("Goto line"
. (lambda (candidate)
(helm-goto-line (string-to-number candidate)))))
:persistent-action (lambda (candidate)
(helm-goto-line (string-to-number candidate))
:persistent-help "Show this line"))
;;; Global-mark-ring
(defvar helm-source-global-mark-ring
(helm-build-sync-source "global-mark-ring"
:candidates #'helm-global-mark-ring-get-candidates
:action '(("Goto line"
. (lambda (candidate)
(let ((items (split-string candidate ":")))
(switch-to-buffer (cl-second items))
(helm-goto-line (string-to-number (car items)))))))
:persistent-action (lambda (candidate)
(let ((items (split-string candidate ":")))
(switch-to-buffer (cl-second items))
(helm-goto-line (string-to-number (car items)))
:persistent-help "Show this line"))
(defun helm-global-mark-ring-format-buffer (marker)
(with-current-buffer (marker-buffer marker)
(goto-char marker)
(forward-line 0)
(let ((line (pcase (thing-at-point 'line)
((and line (pred stringp)
(guard (not (string-match-p "\\`\n?\\'" line))))
(car (split-string line "[\n\r]")))
(_ "<EMPTY LINE>"))))
(format "%7d:%s: %s"
(line-number-at-pos) (marker-buffer marker) line))))
(defun helm-global-mark-ring-get-candidates ()
(let ((marks global-mark-ring))
(when marks
(cl-loop for i in marks
for mb = (marker-buffer i)
for gm = (unless (or (string-match "^ " (format "%s" mb))
(null mb))
(helm-global-mark-ring-format-buffer i))
when (and gm (not (member gm recip)))
collect gm into recip
finally return recip))))
(defun helm--push-mark (&optional location nomsg activate)
"[Internal] Don't use directly, use instead `helm-push-mark-mode'."
(unless (null (mark t))
(setq mark-ring (cons (copy-marker (mark-marker)) mark-ring))
(when (> (length mark-ring) mark-ring-max)
(move-marker (car (nthcdr mark-ring-max mark-ring)) nil)
(setcdr (nthcdr (1- mark-ring-max) mark-ring) nil)))
(set-marker (mark-marker) (or location (point)) (current-buffer))
;; Now push the mark on the global mark ring.
(setq global-mark-ring (cons (copy-marker (mark-marker))
;; Avoid having multiple entries
;; for same buffer in `global-mark-ring'.
(cl-loop with mb = (current-buffer)
for m in global-mark-ring
for nmb = (marker-buffer m)
unless (eq mb nmb)
collect m)))
(when (> (length global-mark-ring) global-mark-ring-max)
(move-marker (car (nthcdr global-mark-ring-max global-mark-ring)) nil)
(setcdr (nthcdr (1- global-mark-ring-max) global-mark-ring) nil))
(or nomsg executing-kbd-macro (> (minibuffer-depth) 0)
(message "Mark set"))
(when (or activate (not transient-mark-mode))
(set-mark (mark t)))
(defadvice push-mark (around helm-push-mark-mode)
(helm--push-mark location nomsg activate))
(define-minor-mode helm-push-mark-mode
"Provide an improved version of `push-mark'.
Modify the behavior of `push-mark' to update
the `global-mark-ring' after each new visit."
:group 'helm-ring
:global t
(if helm-push-mark-mode
(if (fboundp 'advice-add)
(advice-add 'push-mark :override #'helm--push-mark)
(ad-activate 'push-mark))
(if (fboundp 'advice-remove)
(advice-remove 'push-mark #'helm--push-mark)
(ad-deactivate 'push-mark))))
;;;; <Register>
;;; Insert from register
(defvar helm-source-register
(helm-build-sync-source "Registers"
:candidates #'helm-register-candidates
:action-transformer #'helm-register-action-transformer
:persistent-help ""
:multiline t
:action '(("Delete Register(s)" .
(lambda (_candidate)
(cl-loop for candidate in (helm-marked-candidates)
for register = (car candidate)
do (setq register-alist
(delq (assoc register register-alist)
"See (info \"(emacs)Registers\")")
(defun helm-register-candidates ()
"Collecting register contents and appropriate commands."
(cl-loop for (char . val) in register-alist
for key = (single-key-description char)
for string-actions =
((numberp val)
(list (int-to-string val)
((markerp val)
(let ((buf (marker-buffer val)))
(if (null buf)
(list "a marker in no buffer")
(list (concat
"a buffer position:"
(buffer-name buf)
", position "
(int-to-string (marker-position val)))
((and (consp val) (window-configuration-p (car val)))
(list "window configuration."
((and (vectorp val)
(fboundp 'undo-tree-register-data-p)
(undo-tree-register-data-p (elt val 1)))
"Undo-tree entry."
((or (and (vectorp val) (eq 'registerv (aref val 0)))
(and (consp val) (frame-configuration-p (car val))))
(list "frame configuration."
((and (consp val) (eq (car val) 'file))
(list (concat "file:"
(prin1-to-string (cdr val))
((and (consp val) (eq (car val) 'file-query))
(list (concat "file:a file-query reference: file "
(car (cdr val))
", position "
(int-to-string (car (cdr (cdr val))))
((consp val)
(let ((lines (format "%4d" (length val))))
(list (format "%s: %s\n" lines
(mapconcat 'identity (list (car val))
"^J") (- (window-width) 15)))
((stringp val)
;; without properties
(concat (substring-no-properties
val 0 (min (length val) helm-register-max-offset))
(if (> (length val) helm-register-max-offset)
"[...]" ""))
unless (null string-actions) ; Fix Issue #1107.
collect (cons (format "Register %3s:\n %s" key (car string-actions))
(cons char (cdr string-actions)))))
(defun helm-register-action-transformer (actions register-and-functions)
"Decide actions by the contents of register."
(cl-loop with transformer-actions = nil
with func-actions =
"Insert Register" .
(lambda (c) (insert-register (car c))))
"Jump to Register" .
(lambda (c) (jump-to-register (car c))))
"Append Region to Register" .
(lambda (c) (append-to-register
(car c) (region-beginning) (region-end))))
"Prepend Region to Register" .
(lambda (c) (prepend-to-register
(car c) (region-beginning) (region-end))))
"Increment Prefix Arg to Register" .
(lambda (c) (increment-register
helm-current-prefix-arg (car c))))
"Restore Undo-tree register" .
(lambda (c) (and (fboundp 'undo-tree-restore-state-from-register)
(undo-tree-restore-state-from-register (car c))))))
for func in (cdr register-and-functions)
for cell = (assq func func-actions)
when cell
do (push (cdr cell) transformer-actions)
finally return (append (nreverse transformer-actions) actions)))
(defun helm-mark-ring ()
"Preconfigured `helm' for `helm-source-mark-ring'."
(helm :sources 'helm-source-mark-ring
:resume 'noresume
:buffer "*helm mark*"))
(defun helm-global-mark-ring ()
"Preconfigured `helm' for `helm-source-global-mark-ring'."
(helm :sources 'helm-source-global-mark-ring
:resume 'noresume
:buffer "*helm global mark*"))
(defun helm-all-mark-rings ()
"Preconfigured `helm' for `helm-source-global-mark-ring' and \
(helm :sources '(helm-source-mark-ring
:resume 'noresume
:buffer "*helm mark ring*"))
(defun helm-register ()
"Preconfigured `helm' for Emacs registers."
(helm :sources 'helm-source-register
:resume 'noresume
:buffer "*helm register*"))
(defun helm-show-kill-ring ()
"Preconfigured `helm' for `kill-ring'.
It is drop-in replacement of `yank-pop'.
First call open the kill-ring browser, next calls move to next line."
(let ((enable-recursive-minibuffers t))
(helm :sources helm-source-kill-ring
:buffer "*helm kill ring*"
:resume 'noresume
:allow-nest t)))
(defun helm-execute-kmacro ()
"Preconfigured helm for keyboard macros.
Define your macros with `f3' and `f4'.
See (info \"(emacs) Keyboard Macros\") for detailed infos.
This command is useful when used with persistent action."
(helm :sources
(helm-build-sync-source "Kmacro"
:candidates (lambda ()
(cons (kmacro-ring-head)
:test 'equal))
:multiline t
(lambda (candidates)
(cl-loop for c in candidates collect
(propertize (help-key-description (car c) nil)
'helm-realvalue c)))
:persistent-help "Execute kmacro"
:help-message 'helm-kmacro-help-message
"Execute kmacro (`C-u <n>' to execute <n> times)"
(lambda (candidate)
;; Move candidate on top of list for next use.
(setq kmacro-ring (delete candidate kmacro-ring))
(kmacro-split-ring-element candidate)
candidate helm-current-prefix-arg))))
:buffer "*helm kmacro*"))
(provide 'helm-ring)
;; Local Variables:
;; byte-compile-warnings: (not cl-functions obsolete)
;; coding: utf-8
;; indent-tabs-mode: nil
;; End:
;;; helm-ring.el ends here
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