lisp/calc/calc-trail.el

   1 ;;; calc-trail.el --- functions for manipulating the Calc "trail"
   2
   3 ;; Copyright (C) 1990, 1991, 1992, 1993, 2001, 2002, 2003, 2004,
   4 ;;   2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
   5
   6 ;; Author: David Gillespie <daveg@synaptics.com>
   7 ;; Maintainer: Jay Belanger <jay.p.belanger@gmail.com>
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software: you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation, either version 3 of the License, or
  14 ;; (at your option) any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  23
  24 ;;; Commentary:
  25
  26 ;;; Code:
  27
  28 ;; This file is autoloaded from calc-ext.el.
  29
  30 (require 'calc-ext)
  31 (require 'calc-macs)
  32
  33 ;;; Trail commands.
  34
  35 (defun calc-trail-in ()
  36   (interactive)
  37   (let ((win (get-buffer-window (calc-trail-display t))))
  38     (and win (select-window win))))
  39
  40 (defun calc-trail-out ()
  41   (interactive)
  42   (calc-select-buffer)
  43   (let ((win (get-buffer-window (current-buffer))))
  44     (if win
  45         (progn
  46           (select-window win)
  47           (calc-align-stack-window))
  48       (calc))))
  49
  50 (defun calc-trail-next (n)
  51   (interactive "p")
  52   (calc-with-trail-buffer
  53    (forward-line n)
  54    (calc-trail-here)))
  55
  56 (defun calc-trail-previous (n)
  57   (interactive "p")
  58   (calc-with-trail-buffer
  59    (forward-line (- n))
  60    (calc-trail-here)))
  61
  62 (defun calc-trail-first (n)
  63   (interactive "p")
  64   (calc-with-trail-buffer
  65    (goto-char (point-min))
  66    (forward-line n)
  67    (calc-trail-here)))
  68
  69 (defun calc-trail-last (n)
  70   (interactive "p")
  71   (calc-with-trail-buffer
  72    (goto-char (point-max))
  73    (forward-line (- n))
  74    (calc-trail-here)))
  75
  76 (defun calc-trail-scroll-left (n)
  77   (interactive "P")
  78   (let ((curwin (selected-window)))
  79     (calc-with-trail-buffer
  80      (unwind-protect
  81          (progn
  82            (select-window (get-buffer-window (current-buffer)))
  83            (calc-scroll-left n))
  84        (select-window curwin)))))
  85
  86 (defun calc-trail-scroll-right (n)
  87   (interactive "P")
  88   (let ((curwin (selected-window)))
  89     (calc-with-trail-buffer
  90      (unwind-protect
  91          (progn
  92            (select-window (get-buffer-window (current-buffer)))
  93            (calc-scroll-right n))
  94        (select-window curwin)))))
  95
  96 (defun calc-trail-forward (n)
  97   (interactive "p")
  98   (calc-with-trail-buffer
  99    (forward-line (* n (1- (window-height))))
 100    (calc-trail-here)))
 101
 102 (defun calc-trail-backward (n)
 103   (interactive "p")
 104   (calc-with-trail-buffer
 105    (forward-line (- (* n (1- (window-height)))))
 106    (calc-trail-here)))
 107
 108 (defun calc-trail-isearch-forward ()
 109   (interactive)
 110   (calc-with-trail-buffer
 111    (save-window-excursion
 112      (select-window (get-buffer-window (current-buffer)))
 113      (let ((search-exit-char ?\r))
 114        (isearch-forward)))
 115    (calc-trail-here)))
 116
 117 (defun calc-trail-isearch-backward ()
 118   (interactive)
 119   (calc-with-trail-buffer
 120    (save-window-excursion
 121      (select-window (get-buffer-window (current-buffer)))
 122      (let ((search-exit-char ?\r))
 123        (isearch-backward)))
 124    (calc-trail-here)))
 125
 126 (defun calc-trail-yank (arg)
 127   (interactive "P")
 128   (calc-wrapper
 129    (or arg (calc-set-command-flag 'hold-trail))
 130    (calc-enter-result 0 "yank"
 131                       (calc-with-trail-buffer
 132                        (if arg
 133                            (forward-line (- (prefix-numeric-value arg))))
 134                        (if (or (looking-at "Emacs Calc")
 135                                (looking-at "----")
 136                                (looking-at " ? ? ?[^ \n]* *$")
 137                                (looking-at "..?.?$"))
 138                            (error "Can't yank that line"))
 139                        (if (looking-at ".*, \\.\\.\\., ")
 140                            (error "Can't yank (vector was abbreviated)"))
 141                        (forward-char 4)
 142                        (search-forward " ")
 143                        (let* ((next (save-excursion (forward-line 1) (point)))
 144                               (str (buffer-substring (point) (1- next)))
 145                               (val (with-current-buffer save-buf
 146                                      (math-read-plain-expr str))))
 147                          (if (eq (car-safe val) 'error)
 148                              (error "Can't yank that line: %s" (nth 2 val))
 149                            val))))))
 150
 151 (defun calc-trail-marker (str)
 152   (interactive "sText to insert in trail: ")
 153   (calc-with-trail-buffer
 154    (forward-line 1)
 155    (let ((buffer-read-only nil))
 156      (insert "---- " str "\n"))
 157    (forward-line -1)
 158    (calc-trail-here)))
 159
 160 (defun calc-trail-kill (n)
 161   (interactive "p")
 162   (calc-with-trail-buffer
 163    (let ((buffer-read-only nil))
 164      (save-restriction
 165        (narrow-to-region   ; don't delete "Emacs Trail" header
 166         (save-excursion
 167           (goto-char (point-min))
 168           (forward-line 1)
 169           (point))
 170         (point-max))
 171        (kill-line n)))
 172    (calc-trail-here)))
 173
 174 (provide 'calc-trail)
 175
 176 ;; arch-tag: 59b76655-d882-4aab-a3ee-b83870e530d0
 177 ;;; calc-trail.el ends here