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302 lines
10 KiB
EmacsLisp
302 lines
10 KiB
EmacsLisp
;;; lisp.el --- Lisp editing commands for Emacs
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;; Copyright (C) 1985, 1986, 1994 Free Software Foundation, Inc.
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;; Maintainer: FSF
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;; Keywords: lisp, languages
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to
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;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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;;; Commentary:
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;; Lisp editing commands to go with Lisp major mode.
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;;; Code:
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;; Note that this variable is used by non-lisp modes too.
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(defvar defun-prompt-regexp nil
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"*Non-nil => regexp to ignore, before the character that starts a defun.
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This is only necessary if the opening paren or brace is not in column 0.
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See `beginning-of-defun'.")
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(make-variable-buffer-local 'defun-prompt-regexp)
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(defvar parens-require-spaces t
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"Non-nil => `insert-parentheses' should insert whitespace as needed.")
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(defun forward-sexp (&optional arg)
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"Move forward across one balanced expression (sexp).
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With argument, do it that many times. Negative arg -N means
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move backward across N balanced expressions."
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(interactive "p")
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(or arg (setq arg 1))
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(goto-char (or (scan-sexps (point) arg) (buffer-end arg)))
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(if (< arg 0) (backward-prefix-chars)))
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(defun backward-sexp (&optional arg)
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"Move backward across one balanced expression (sexp).
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With argument, do it that many times. Negative arg -N means
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move forward across N balanced expressions."
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(interactive "p")
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(or arg (setq arg 1))
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(forward-sexp (- arg)))
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(defun mark-sexp (arg)
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"Set mark ARG sexps from point.
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The place mark goes is the same place \\[forward-sexp] would
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move to with the same argument."
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(interactive "p")
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(push-mark
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(save-excursion
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(forward-sexp arg)
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(point))
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nil t))
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(defun forward-list (&optional arg)
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"Move forward across one balanced group of parentheses.
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With argument, do it that many times.
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Negative arg -N means move backward across N groups of parentheses."
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(interactive "p")
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(or arg (setq arg 1))
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(goto-char (or (scan-lists (point) arg 0) (buffer-end arg))))
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(defun backward-list (&optional arg)
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"Move backward across one balanced group of parentheses.
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With argument, do it that many times.
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Negative arg -N means move forward across N groups of parentheses."
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(interactive "p")
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(or arg (setq arg 1))
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(forward-list (- arg)))
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(defun down-list (arg)
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"Move forward down one level of parentheses.
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With argument, do this that many times.
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A negative argument means move backward but still go down a level.
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In Lisp programs, an argument is required."
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(interactive "p")
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(let ((inc (if (> arg 0) 1 -1)))
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(while (/= arg 0)
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(goto-char (or (scan-lists (point) inc -1) (buffer-end arg)))
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(setq arg (- arg inc)))))
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(defun backward-up-list (arg)
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"Move backward out of one level of parentheses.
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With argument, do this that many times.
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A negative argument means move forward but still to a less deep spot.
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In Lisp programs, an argument is required."
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(interactive "p")
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(up-list (- arg)))
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(defun up-list (arg)
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"Move forward out of one level of parentheses.
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With argument, do this that many times.
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A negative argument means move backward but still to a less deep spot.
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In Lisp programs, an argument is required."
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(interactive "p")
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(let ((inc (if (> arg 0) 1 -1)))
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(while (/= arg 0)
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(goto-char (or (scan-lists (point) inc 1) (buffer-end arg)))
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(setq arg (- arg inc)))))
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(defun kill-sexp (arg)
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"Kill the sexp (balanced expression) following the cursor.
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With argument, kill that many sexps after the cursor.
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Negative arg -N means kill N sexps before the cursor."
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(interactive "p")
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(let ((opoint (point)))
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(forward-sexp arg)
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(kill-region opoint (point))))
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(defun backward-kill-sexp (arg)
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"Kill the sexp (balanced expression) preceding the cursor.
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With argument, kill that many sexps before the cursor.
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Negative arg -N means kill N sexps after the cursor."
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(interactive "p")
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(kill-sexp (- arg)))
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(defun beginning-of-defun (&optional arg)
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"Move backward to the beginning of a defun.
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With argument, do it that many times. Negative arg -N
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means move forward to Nth following beginning of defun.
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Returns t unless search stops due to beginning or end of buffer.
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Normally a defun starts when there is an char with open-parenthesis
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syntax at the beginning of a line. If `defun-prompt-regexp' is
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non-nil, then a string which matches that regexp may precede the
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open-parenthesis, and point ends up at the beginning of the line."
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(interactive "p")
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(and (beginning-of-defun-raw arg)
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(progn (beginning-of-line) t)))
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(defun beginning-of-defun-raw (&optional arg)
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"Move point to the character that starts a defun.
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This is identical to beginning-of-defun, except that point does not move
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to the beginning of the line when `defun-prompt-regexp' is non-nil."
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(interactive "p")
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(and arg (< arg 0) (not (eobp)) (forward-char 1))
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(and (re-search-backward (if defun-prompt-regexp
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(concat "^\\s(\\|"
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"\\(" defun-prompt-regexp "\\)\\s(")
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"^\\s(")
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nil 'move (or arg 1))
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(progn (goto-char (1- (match-end 0)))) t))
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(defun buffer-end (arg)
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(if (> arg 0) (point-max) (point-min)))
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(defun end-of-defun (&optional arg)
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"Move forward to next end of defun. With argument, do it that many times.
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Negative argument -N means move back to Nth preceding end of defun.
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An end of a defun occurs right after the close-parenthesis that matches
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the open-parenthesis that starts a defun; see `beginning-of-defun'."
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(interactive "p")
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(if (or (null arg) (= arg 0)) (setq arg 1))
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(let ((first t))
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(while (and (> arg 0) (< (point) (point-max)))
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(let ((pos (point)) npos)
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(while (progn
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(if (and first
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(progn
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(end-of-line 1)
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(beginning-of-defun-raw 1)))
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nil
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(or (bobp) (forward-char -1))
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(beginning-of-defun-raw -1))
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(setq first nil)
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(forward-list 1)
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(skip-chars-forward " \t")
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(if (looking-at "\\s<\\|\n")
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(forward-line 1))
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(<= (point) pos))))
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(setq arg (1- arg)))
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(while (< arg 0)
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(let ((pos (point)))
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(beginning-of-defun-raw 1)
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(forward-sexp 1)
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(forward-line 1)
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(if (>= (point) pos)
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(if (beginning-of-defun-raw 2)
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(progn
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(forward-list 1)
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(skip-chars-forward " \t")
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(if (looking-at "\\s<\\|\n")
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(forward-line 1)))
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(goto-char (point-min)))))
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(setq arg (1+ arg)))))
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(defun mark-defun ()
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"Put mark at end of this defun, point at beginning.
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The defun marked is the one that contains point or follows point."
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(interactive)
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(push-mark (point))
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(end-of-defun)
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(push-mark (point) nil t)
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(beginning-of-defun)
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(re-search-backward "^\n" (- (point) 1) t))
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(defun insert-parentheses (arg)
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"Put parentheses around next ARG sexps. Leave point after open-paren.
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No argument is equivalent to zero: just insert `()' and leave point between.
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If `parens-require-spaces' is non-nil, this command also inserts a space
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before and after, depending on the surrounding characters."
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(interactive "P")
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(if arg (setq arg (prefix-numeric-value arg))
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(setq arg 0))
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(or (eq arg 0) (skip-chars-forward " \t"))
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(and parens-require-spaces
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(not (bobp))
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(memq (char-syntax (preceding-char)) '(?w ?_ ?\) ))
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(insert " "))
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(insert ?\()
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(save-excursion
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(or (eq arg 0) (forward-sexp arg))
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(insert ?\))
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(and parens-require-spaces
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(not (eobp))
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(memq (char-syntax (following-char)) '(?w ?_ ?\( ))
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(insert " "))))
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(defun move-past-close-and-reindent ()
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"Move past next `)', delete indentation before it, then indent after it."
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(interactive)
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(up-list 1)
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(forward-char -1)
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(while (save-excursion ; this is my contribution
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(let ((before-paren (point)))
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(back-to-indentation)
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(= (point) before-paren)))
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(delete-indentation))
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(forward-char 1)
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(newline-and-indent))
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(defun lisp-complete-symbol ()
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"Perform completion on Lisp symbol preceding point.
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Compare that symbol against the known Lisp symbols.
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The context determines which symbols are considered.
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If the symbol starts just after an open-parenthesis, only symbols
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with function definitions are considered. Otherwise, all symbols with
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function definitions, values or properties are considered."
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(interactive)
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(let* ((end (point))
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(buffer-syntax (syntax-table))
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(beg (unwind-protect
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(save-excursion
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(set-syntax-table emacs-lisp-mode-syntax-table)
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(backward-sexp 1)
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(while (= (char-syntax (following-char)) ?\')
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(forward-char 1))
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(point))
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(set-syntax-table buffer-syntax)))
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(pattern (buffer-substring beg end))
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(predicate
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(if (eq (char-after (1- beg)) ?\()
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'fboundp
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(function (lambda (sym)
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(or (boundp sym) (fboundp sym)
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(symbol-plist sym))))))
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(completion (try-completion pattern obarray predicate)))
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(cond ((eq completion t))
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((null completion)
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(message "Can't find completion for \"%s\"" pattern)
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(ding))
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((not (string= pattern completion))
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(delete-region beg end)
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(insert completion))
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(t
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(message "Making completion list...")
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(let ((list (all-completions pattern obarray predicate))
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(completion-fixup-function
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(function (lambda () (if (save-excursion
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(goto-char (max (point-min) (- (point) 4)))
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(looking-at " <f>"))
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(forward-char -4))))))
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(or (eq predicate 'fboundp)
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(let (new)
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(while list
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(setq new (cons (if (fboundp (intern (car list)))
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(list (car list) " <f>")
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(car list))
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new))
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(setq list (cdr list)))
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(setq list (nreverse new))))
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(with-output-to-temp-buffer "*Completions*"
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(display-completion-list list)))
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(message "Making completion list...%s" "done")))))
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;;; lisp.el ends here
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