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;;; calc-trail.el --- functions for manipulating the Calc "trail"
;; Copyright (C) 1990-1993, 2001-2017 Free Software Foundation, Inc.
;; Author: David Gillespie <daveg@synaptics.com>
;; 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:
;; This file is autoloaded from calc-ext.el.
(require 'calc-ext)
(require 'calc-macs)
;;; Trail commands.
(defun calc-trail-in ()
(interactive)
(let ((win (get-buffer-window (calc-trail-display t))))
(and win (select-window win))))
(defun calc-trail-out ()
(interactive)
(calc-select-buffer)
(let ((win (get-buffer-window (current-buffer))))
(if win
(progn
(select-window win)
(calc-align-stack-window))
(calc))))
(defun calc-trail-next (n)
(interactive "p")
(calc-with-trail-buffer
(forward-line n)
(calc-trail-here)))
(defun calc-trail-previous (n)
(interactive "p")
(calc-with-trail-buffer
(forward-line (- n))
(calc-trail-here)))
(defun calc-trail-first (n)
(interactive "p")
(calc-with-trail-buffer
(goto-char (point-min))
(forward-line n)
(calc-trail-here)))
(defun calc-trail-last (n)
(interactive "p")
(calc-with-trail-buffer
(goto-char (point-max))
(forward-line (- n))
(calc-trail-here)))
(defun calc-trail-scroll-left (n)
(interactive "P")
(let ((curwin (selected-window)))
(calc-with-trail-buffer
(unwind-protect
(progn
(select-window (get-buffer-window (current-buffer)))
(calc-scroll-left n))
(select-window curwin)))))
(defun calc-trail-scroll-right (n)
(interactive "P")
(let ((curwin (selected-window)))
(calc-with-trail-buffer
(unwind-protect
(progn
(select-window (get-buffer-window (current-buffer)))
(calc-scroll-right n))
(select-window curwin)))))
(defun calc-trail-forward (n)
(interactive "p")
(calc-with-trail-buffer
(forward-line (* n (1- (window-height))))
(calc-trail-here)))
(defun calc-trail-backward (n)
(interactive "p")
(calc-with-trail-buffer
(forward-line (- (* n (1- (window-height)))))
(calc-trail-here)))
(defun calc-trail-isearch-forward ()
(interactive)
(calc-with-trail-buffer
(let ((win (get-buffer-window (current-buffer)))
pos)
(save-window-excursion
(select-window win)
(isearch-forward)
(setq pos (point)))
(goto-char pos)
(set-window-point win pos)
(calc-trail-here))))
(defun calc-trail-isearch-backward ()
(interactive)
(calc-with-trail-buffer
(let ((win (get-buffer-window (current-buffer)))
pos)
(save-window-excursion
(select-window win)
(isearch-backward)
(setq pos (point)))
(goto-char pos)
(set-window-point win pos)
(calc-trail-here))))
(defun calc-trail-yank (arg)
(interactive "P")
(calc-wrapper
(or arg (calc-set-command-flag 'hold-trail))
(calc-enter-result 0 "yank"
(calc-with-trail-buffer
(if arg
(forward-line (- (prefix-numeric-value arg))))
(if (or (looking-at "Emacs Calc")
(looking-at "----")
(looking-at " ? ? ?[^ \n]* *$")
(looking-at "..?.?$"))
(error "Can't yank that line"))
(if (looking-at ".*, \\.\\.\\., ")
(error "Can't yank (vector was abbreviated)"))
(forward-char 4)
(search-forward " ")
(let* ((next (save-excursion (forward-line 1) (point)))
(str (buffer-substring (point) (1- next)))
(val (with-current-buffer save-buf
(math-read-plain-expr str))))
(if (eq (car-safe val) 'error)
(error "Can't yank that line: %s" (nth 2 val))
val))))))
(defun calc-trail-marker (str)
(interactive "sText to insert in trail: ")
(calc-with-trail-buffer
(forward-line 1)
(let ((buffer-read-only nil))
(insert "---- " str "\n"))
(forward-line -1)
(calc-trail-here)))
(defun calc-trail-kill (n)
(interactive "p")
(calc-with-trail-buffer
(let ((buffer-read-only nil))
(save-restriction
(narrow-to-region ; don't delete "Emacs Trail" header
(save-excursion
(goto-char (point-min))
(forward-line 1)
(point))
(point-max))
(kill-line n)))
(calc-trail-here)))
(provide 'calc-trail)
;;; calc-trail.el ends here
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