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Annotation of 43BSD/contrib/emacs/lisp/lisp.el, revision 1.1

1.1     ! root        1: ;; Lisp editing commands for Emacs
        !             2: ;; Copyright (C) 1985 Richard M. Stallman.
        !             3: 
        !             4: ;; This file is part of GNU Emacs.
        !             5: 
        !             6: ;; GNU Emacs is distributed in the hope that it will be useful,
        !             7: ;; but WITHOUT ANY WARRANTY.  No author or distributor
        !             8: ;; accepts responsibility to anyone for the consequences of using it
        !             9: ;; or for whether it serves any particular purpose or works at all,
        !            10: ;; unless he says so in writing.  Refer to the GNU Emacs General Public
        !            11: ;; License for full details.
        !            12: 
        !            13: ;; Everyone is granted permission to copy, modify and redistribute
        !            14: ;; GNU Emacs, but only under the conditions described in the
        !            15: ;; GNU Emacs General Public License.   A copy of this license is
        !            16: ;; supposed to have been given to you along with GNU Emacs so you
        !            17: ;; can know your rights and responsibilities.  It should be in a
        !            18: ;; file named COPYING.  Among other things, the copyright notice
        !            19: ;; and this notice must be preserved on all copies.
        !            20: 
        !            21: 
        !            22: (defun forward-sexp (&optional arg)
        !            23:   "Move forward across one balanced expression.
        !            24: With argument, do this that many times."
        !            25:   (interactive "p")
        !            26:   (or arg (setq arg 1))
        !            27:   (goto-char (or (scan-sexps (point) arg) (buffer-end arg)))
        !            28:   (if (< arg 0) (backward-prefix-chars)))
        !            29: 
        !            30: (defun backward-sexp (&optional arg)
        !            31:   "Move backward across one balanced expression.
        !            32: With argument, do this that many times."
        !            33:   (interactive "p")
        !            34:   (or arg (setq arg 1))
        !            35:   (forward-sexp (- arg)))
        !            36: 
        !            37: (defun mark-sexp (arg)
        !            38:   "Set mark ARG sexps from point."
        !            39:   (interactive "p")
        !            40:   (push-mark
        !            41:     (save-excursion
        !            42:       (forward-sexp arg)
        !            43:       (point))))
        !            44: 
        !            45: (defun forward-list (&optional arg)
        !            46:   "Move forward across one balanced group of parentheses.
        !            47: With argument, do this that many times."
        !            48:   (interactive "p")
        !            49:   (or arg (setq arg 1))
        !            50:   (goto-char (or (scan-lists (point) arg 0) (buffer-end arg))))
        !            51: 
        !            52: (defun backward-list (&optional arg)
        !            53:   "Move backward across one balanced group of parentheses.
        !            54: With argument, do this that many times."
        !            55:   (interactive "p")
        !            56:   (or arg (setq arg 1))
        !            57:   (forward-list (- arg)))
        !            58: 
        !            59: (defun down-list (arg)
        !            60:   "Move forward down one level of parentheses.
        !            61: With argument, do this that many times.
        !            62: A negative argument means move backward but still go down a level."
        !            63:   (interactive "p")
        !            64:   (let ((inc (if (> arg 0) 1 -1)))
        !            65:     (while (/= arg 0)
        !            66:       (goto-char (or (scan-lists (point) inc -1) (buffer-end arg)))
        !            67:       (setq arg (- arg inc)))))
        !            68: 
        !            69: (defun backward-up-list (arg)
        !            70:   "Move backward out of one level of parentheses.
        !            71: With argument, do this that many times.
        !            72: A negative argument means move forward but still to a less deep spot."
        !            73:   (interactive "p")
        !            74:   (up-list (- arg)))
        !            75: 
        !            76: (defun up-list (arg) 
        !            77:   "Move forward out of one level of parentheses.
        !            78: With argument, do this that many times.
        !            79: A negative argument means move backward but still to a less deep spot."
        !            80:   (interactive "p")
        !            81:   (let ((inc (if (> arg 0) 1 -1)))
        !            82:     (while (/= arg 0)
        !            83:       (goto-char (or (scan-lists (point) inc 1) (buffer-end arg)))
        !            84:       (setq arg (- arg inc)))))
        !            85: 
        !            86: (defun kill-sexp (arg)
        !            87:   "Kill the syntactic expression following the cursor.
        !            88: With argument, kill that many expressions after (or before) the cursor."
        !            89:   (interactive "p")
        !            90:   (let ((opoint (point)))
        !            91:     (forward-sexp arg)
        !            92:     (kill-region opoint (point))))
        !            93: 
        !            94: (defun backward-kill-sexp (arg)
        !            95:   "Kill the syntactic expression preceding the cursor.
        !            96: With argument, kill that many expressions before (or after) the cursor."
        !            97:   (interactive "p")
        !            98:   (kill-sexp (- arg)))
        !            99: 
        !           100: (defun beginning-of-defun (&optional arg)
        !           101:   "Move backward to next beginning-of-defun.
        !           102: With argument, do this that many times.
        !           103: Returns t unless search stops due to end of buffer."
        !           104:   (interactive "p")
        !           105:   (and arg (< arg 0) (forward-char 1))
        !           106:   (and (re-search-backward "^\\s(" nil 'move (or arg 1))
        !           107:        (progn (beginning-of-line) t)))
        !           108: 
        !           109: (defun buffer-end (arg)
        !           110:   (if (> arg 0) (point-max) (point-min)))
        !           111: 
        !           112: (defun end-of-defun (&optional arg)
        !           113:   "Move forward to next end of defun.
        !           114: An end of a defun is found by moving forward from the beginning of one."
        !           115:   (interactive "p")
        !           116:   (if (or (null arg) (= arg 0)) (setq arg 1))
        !           117:   (let ((first t))
        !           118:     (while (and (> arg 0) (< (point) (point-max)))
        !           119:       (let ((pos (point)) npos)
        !           120:        (while (progn
        !           121:                (if (and first
        !           122:                         (progn
        !           123:                          (forward-char 1)
        !           124:                          (beginning-of-defun 1)))
        !           125:                    nil
        !           126:                  (or (bobp) (forward-char -1))
        !           127:                  (beginning-of-defun -1))
        !           128:                (setq first nil)
        !           129:                (forward-list 1)
        !           130:                (skip-chars-forward " \t")
        !           131:                (if (looking-at "[;\n]")
        !           132:                    (forward-line 1))
        !           133:                (<= (point) pos))))
        !           134:       (setq arg (1- arg)))
        !           135:     (while (< arg 0)
        !           136:       (let ((pos (point)))
        !           137:        (beginning-of-defun 1)
        !           138:        (forward-sexp 1)
        !           139:        (goto-char (scan-buffer (point) 1 ?\n))
        !           140:        (if (>= (point) pos)
        !           141:            (if (beginning-of-defun 2)
        !           142:                (progn
        !           143:                 (forward-list 1)
        !           144:                 (skip-chars-forward " \t")
        !           145:                 (if (looking-at "[;\n]")
        !           146:                     (forward-line 1)))
        !           147:              (goto-char (point-min)))))
        !           148:       (setq arg (1+ arg)))))
        !           149: 
        !           150: (defun mark-defun ()
        !           151:   "Put mark at end of defun, point at beginning."
        !           152:   (interactive)
        !           153:   (push-mark (point))
        !           154:   (end-of-defun)
        !           155:   (push-mark (point))
        !           156:   (beginning-of-defun)
        !           157:   (re-search-backward "^\n" (- (point) 1) t))
        !           158: 
        !           159: (defun insert-parentheses (arg)
        !           160:   "Put parentheses around next ARG sexps.  Leave point after open-paren.
        !           161: No argument is equivalent to zero: just insert () and leave point between."
        !           162:   (interactive "P")
        !           163:   (insert ?\()
        !           164:   (save-excursion
        !           165:     (if arg
        !           166:        (forward-sexp (prefix-numeric-value arg)))
        !           167:     (insert ?\))))
        !           168: 
        !           169: (defun move-past-close-and-reindent ()
        !           170:   "Move past next ), delete indentation before it, then indent after it."
        !           171:   (interactive)
        !           172:   (up-list 1)
        !           173:   (forward-char -1)
        !           174:   (while (save-excursion               ; this is my contribution
        !           175:           (let ((before-paren (point)))
        !           176:             (back-to-indentation)
        !           177:             (= (point) before-paren)))
        !           178:     (delete-indentation))
        !           179:   (forward-char 1)
        !           180:   (newline-and-indent))

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