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

1.1     ! root        1: ;; Register 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: (defvar register-alist nil
        !            23:   "Alist of elements (NAME . CONTENTS), one for each Emacs register.
        !            24: NAME is a character (a number).  CONTENTS is a string, number,
        !            25: mark or list.  A list represents a rectangle; its elements are strings.")
        !            26: 
        !            27: (defun get-register (char)
        !            28:   "Return contents of Emacs register named CHAR, or nil if none."
        !            29:   (cdr (assq char register-alist)))
        !            30: 
        !            31: (defun set-register (char value)
        !            32:   "Set contents of Emacs register named CHAR to VALUE."
        !            33:   (let ((aelt (assq char register-alist)))
        !            34:     (if aelt
        !            35:        (setcdr aelt value)
        !            36:       (setq aelt (cons char value))
        !            37:       (setq register-alist (cons aelt register-alist)))))
        !            38: 
        !            39: (defun point-to-register (char)
        !            40:   "Store current location of point in a register.
        !            41: Argument is a character, naming the register."
        !            42:   (interactive "cPoint to register: ")
        !            43:   (set-register char (point-marker)))
        !            44: 
        !            45: (defun register-to-point (char)
        !            46:   "Move point to location stored in a register.
        !            47: Argument is a character, naming the register."
        !            48:   (interactive "cRegister to point: ")
        !            49:   (let ((val (get-register char)))
        !            50:     (if (markerp val)
        !            51:        (progn
        !            52:          (switch-to-buffer (marker-buffer val))
        !            53:          (goto-char val))
        !            54:       (error "Register doesn't contain a buffer position"))))
        !            55: 
        !            56: ;(defun number-to-register (arg char)
        !            57: ;  "Store a number in a register.
        !            58: ;Two args, NUMBER and REGISTER (a character, naming the register).
        !            59: ;If NUMBER is nil, digits in the buffer following point are read
        !            60: ;to get the number to store.
        !            61: ;Interactively, NUMBER is the prefix arg (none means nil)."
        !            62: ;  (interactive "P\ncNumber to register: ")
        !            63: ;  (set-register char 
        !            64: ;              (if arg
        !            65: ;                  (prefix-numeric-value arg)
        !            66: ;                (if (looking-at "[0-9][0-9]*")
        !            67: ;                    (save-excursion
        !            68: ;                     (save-restriction
        !            69: ;                      (narrow-to-region (point)
        !            70: ;                                        (progn (skip-chars-forward "0-9")
        !            71: ;                                               (point)))
        !            72: ;                      (goto-char (point-min))
        !            73: ;                      (read (current-buffer))))
        !            74: ;                  0))))
        !            75: 
        !            76: ;(defun increment-register (arg char)
        !            77: ;  "Add NUMBER to the contents of register REGISTER.
        !            78: ;Interactively, NUMBER is the prefix arg (none means nil)." 
        !            79: ;  (interactive "p\ncNumber to register: ")
        !            80: ;  (or (integerp (get-register char))
        !            81: ;      (error "Register does not contain a number"))
        !            82: ;  (set-register char (+ arg (get-register char))))
        !            83: 
        !            84: (defun view-register (char)
        !            85:   "Display what is contained in register named REGISTER.
        !            86: REGISTER is a character."
        !            87:   (interactive "cView register: ")
        !            88:   (let ((val (get-register char)))
        !            89:     (if (null val)
        !            90:        (message "Register %s is empty" (single-key-description char))
        !            91:       (with-output-to-temp-buffer "*Output*"
        !            92:        (princ "Register ")
        !            93:        (princ (single-key-description char))
        !            94:        (princ " contains ")
        !            95:        (if (integerp val)
        !            96:            (princ val)
        !            97:          (if (markerp val)
        !            98:              (progn
        !            99:                (princ "a buffer position:\nbuffer ")
        !           100:                (princ (buffer-name (marker-buffer val)))
        !           101:                (princ ", position ")
        !           102:                (princ (+ 0 val)))
        !           103:            (if (consp val)
        !           104:                (progn
        !           105:                  (princ "the rectangle:\n")
        !           106:                  (setq val (cdr val))
        !           107:                  (while val
        !           108:                    (princ (car val))
        !           109:                    (terpri)
        !           110:                    (setq val (cdr val))))
        !           111:              (princ "the string:\n")
        !           112:              (princ val))))))))
        !           113: 
        !           114: (defun insert-register (char &optional arg)
        !           115:   "Insert contents of register REG.  REG is a character.
        !           116: Normally puts point before and mark after the inserted text.
        !           117: If optional second arg is non-nil, puts mark before and point after.
        !           118: Interactively, second arg is non-nil if prefix arg is supplied."
        !           119:   (interactive "cInsert register: \nP")
        !           120:   (push-mark)
        !           121:   (let ((val (get-register char)))
        !           122:     (if (consp val)
        !           123:        (insert-rectangle val)
        !           124:       (if (stringp val)
        !           125:          (insert val)
        !           126:        (if (or (integerp val) (markerp val))
        !           127:            (princ (+ 0 val) (current-buffer))
        !           128:          (error "Register does not contain text")))))
        !           129:   (or arg (exchange-point-and-mark)))
        !           130: 
        !           131: (defun copy-to-register (char start end &optional delete-flag)
        !           132:   "Copy region into register REG.
        !           133: With prefix arg, delete as well.
        !           134: Called from program, takes four args:
        !           135: REG, START, END and DELETE-FLAG.
        !           136: START and END are buffer positions indicating what to copy."
        !           137:   (interactive "cCopy to register: \nr\nP")
        !           138:   (set-register char (buffer-substring start end))
        !           139:   (if delete-flag (delete-region start end)))
        !           140: 
        !           141: (defun append-to-register (char start end &optional delete-flag)
        !           142:   "Append region to text in register REG.
        !           143: With prefix arg, delete as well.
        !           144: Called from program, takes four args:
        !           145: REG, START, END and DELETE-FLAG.
        !           146: START and END are buffer positions indicating what to append."
        !           147:   (interactive "cAppend to register: \nr\nP")
        !           148:   (or (stringp (get-register char))
        !           149:       (error "Register does not contain text"))
        !           150:   (set-register char (concat (get-register char)
        !           151:                             (buffer-substring start end)))
        !           152:   (if delete-flag (delete-region start end)))
        !           153: 
        !           154: (defun prepend-to-register (char start end &optional delete-flag)
        !           155:   "Prepend region to text in register REG.
        !           156: With prefix arg, delete as well.
        !           157: Called from program, takes four args:
        !           158: REG, START, END and DELETE-FLAG.
        !           159: START and END are buffer positions indicating what to prepend."
        !           160:   (interactive "cPrepend to register: \nr\nP")
        !           161:   (or (stringp (get-register char))
        !           162:       (error "Register does not contain text"))
        !           163:   (set-register char (concat (buffer-substring start end)
        !           164:                             (get-register char)))
        !           165:   (if delete-flag (delete-region start end)))
        !           166: 
        !           167: (defun copy-rectangle-to-register (char start end &optional delete-flag)
        !           168:   "Copy rectangular region into register REG.
        !           169: With prefix arg, delete as well.
        !           170: Called from program, takes four args:
        !           171: REG, START, END and DELETE-FLAG.
        !           172: START and END are buffer positions giving two corners of rectangle."
        !           173:   (interactive "cCopy rectangle to register: \nr\nP")
        !           174:   (set-register char
        !           175:                (if delete-flag
        !           176:                    (delete-extract-rectangle start end)
        !           177:                  (extract-rectangle start end))))

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