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;;; echistory.el --- Electric Command History Mode -*- lexical-binding: t -*-
;; Copyright (C) 1985, 2001-2025 Free Software Foundation, Inc.
;; Author: K. Shane Hartman
;; Maintainer: emacs-devel@gnu.org
;; This file is part of GNU Emacs.
;; GNU Emacs 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.
;; GNU Emacs 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. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;;; Code:
(require 'electric) ; command loop
(require 'chistory) ; history lister
;; Dynamically bound in electric-command-history
(defvar electric-history-in-progress)
;;;###autoload
(defun Electric-command-history-redo-expression (&optional noconfirm)
"Edit current history line in minibuffer and execute result.
With prefix arg NOCONFIRM, execute current line as-is without editing."
(interactive "P")
(let (todo)
(with-current-buffer "*Command History*"
(beginning-of-line)
(setq todo (read (current-buffer)))
(if (boundp 'electric-history-in-progress)
(if todo (throw 'electric-history-quit (list noconfirm todo)))))))
(defvar electric-history-map
(let ((map (make-sparse-keymap)))
(define-key map [t] #'Electric-history-undefined)
(define-key map "\e" (make-sparse-keymap))
(define-key map [?\e t] #'Electric-history-undefined)
(define-key map "\C-u" #'universal-argument)
(define-key map " " #'Electric-command-history-redo-expression)
(define-key map "!" #'Electric-command-history-redo-expression)
(define-key map "\e\C-d" #'down-list)
(define-key map "\e\C-u" #'backward-up-list)
(define-key map "\e\C-b" #'backward-sexp)
(define-key map "\e\C-f" #'forward-sexp)
(define-key map "\e\C-a" #'beginning-of-defun)
(define-key map "\e\C-e" #'end-of-defun)
(define-key map "\e\C-n" #'forward-list)
(define-key map "\e\C-p" #'backward-list)
(define-key map "q" #'Electric-history-quit)
(define-key map "\C-c" nil)
(define-key map "\C-c\C-c" #'Electric-history-quit)
(define-key map "\C-]" #'Electric-history-quit)
(define-key map "\C-z" #'suspend-frame)
(define-key map (char-to-string help-char) #'Helper-help)
(define-key map "?" #'Helper-describe-bindings)
(define-key map "\e>" #'end-of-buffer)
(define-key map "\e<" #'beginning-of-buffer)
(define-key map "\n" #'next-line)
(define-key map "\r" #'next-line)
(define-key map "\177" #'previous-line)
(define-key map "\C-n" #'next-line)
(define-key map "\C-p" #'previous-line)
(define-key map "\ev" #'scroll-down)
(define-key map "\C-v" #'scroll-up)
(define-key map [home] #'beginning-of-buffer)
(define-key map [down] #'next-line)
(define-key map [up] #'previous-line)
(define-key map [prior] #'scroll-down)
(define-key map [next] #'scroll-up)
(define-key map "\C-l" #'recenter)
(define-key map "\e\C-v" #'scroll-other-window)
map)
"Keymap for Electric Command History mode.")
(defvar electric-command-history-hook nil
"If non-nil, its value is called by `electric-command-history'.")
(defvar Helper-return-blurb) ; from helper.el
(defun electric-command-history ()
"\\<electric-history-map>Major mode for examining and redoing commands from `command-history'.
This pops up a window with the Command History listing.
The number of command listed is controlled by `list-command-history-max'.
The command history is filtered by `list-command-history-filter' if non-nil.
Combines typeout Command History list window with menu like selection
of an expression from the history for re-evaluation in the *original* buffer.
The history displayed is filtered by `list-command-history-filter' if non-nil.
Like Emacs-Lisp mode except that characters do not insert themselves and
Tab and Linefeed do not indent. Instead these commands are provided:
\\{electric-history-map}
Calls the value of `electric-command-history-hook' if that is non-nil.
The Command History listing is recomputed each time this mode is invoked."
(interactive)
(let ((electric-history-in-progress t)
(old-buffer (current-buffer))
(todo))
(unwind-protect
(setq todo
(catch 'electric-history-quit
(save-window-excursion
(save-window-excursion
(list-command-history)
(set-buffer "*Command History*")
(setq major-mode 'electric-command-history)
(setq mode-name "Electric History")
(use-local-map electric-history-map))
(Electric-pop-up-window "*Command History*")
(run-hooks 'electric-command-history-hook)
(if (eobp)
(progn (ding)
(message "No command history.")
(throw 'electric-history-quit nil))
(let ((Helper-return-blurb "return to History"))
(Electric-command-loop 'electric-history-quit
"->" t))))))
(set-buffer "*Command History*")
(command-history-mode)
(bury-buffer (current-buffer)))
(if (consp todo)
(progn (set-buffer old-buffer)
(if (car todo)
(apply (car (car (cdr todo))) (cdr (car (cdr todo))))
(edit-and-eval-command "Redo: " (car (cdr todo))))))))
(defun Electric-history-undefined ()
(interactive)
(ding)
(message "%s" (substitute-command-keys "Type \\[Helper-help] for help, \
\\[Helper-describe-bindings] for commands, \\[Electric-history-quit] to quit, \
\\[Electric-command-history-redo-expression] to execute"))
(sit-for 4))
(defun Electric-history-quit ()
"Quit Electric Command History, restoring previous window configuration."
(interactive)
(if (boundp 'electric-history-in-progress)
(progn (message "")
(throw 'electric-history-quit nil))))
(provide 'echistory)
;;; echistory.el ends here
|
