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;;; rdebug-locring.el --- Ruby debugger location ring
;; Copyright (C) 2008, 2009 Rocky Bernstein (
;; Copyright (C) 2008 Anders Lindgren
;; $Id: rdebug-locring.el 917 2009-03-31 09:49:37Z rockyb $
;; This program 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 2, or (at your option)
;; any later version.
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Commentary:
;; This file manages a ring of (recently stopped) positions to allow
;; the programmer to move back and forth between them.
;;; Code:
(defvar rdebug-source-location-ring nil
"Ring of the last `rdebug-source-location-ring-size' positions we've stopped aft.")
(defvar rdebug-source-location-ring-index -1
"Position in `rdebug-source-location-ring' of where we are.")
(defun rdebug-locring-add (frame location-history-ring)
"Add FRAME to LOCATION-HISTORY-RING if we are on the top frame and have a frame to add."
;; Switching frames shouldn't save a new ring
;; position. Also make sure no position is different.
;; Perhaps duplicates should be controlled by an option.
(unless (and (not (ring-empty-p location-history-ring))
(equal (ring-ref location-history-ring
(ring-length location-history-ring)) frame))
(ring-insert-at-beginning location-history-ring frame)))
(defun rdebug-locring-clear ()
"Clear out all source locations in `Go to the source location of the first stopping point."
(setq rdebug-source-location-ring-index -1)
(while (not (ring-empty-p rdebug-source-location-ring))
(ring-remove rdebug-source-location-ring)))
(defun rdebug-locring-goto (ring-position)
"Go the source position RING-POSITION in the stopping history."
(interactive "NSource location ring position (0 is oldest): ")
(with-current-buffer gud-comint-buffer
(setq rdebug-source-location-ring-index ring-position)
(let* ((frame (ring-ref rdebug-source-location-ring ring-position))
(file (car frame))
(line (cdr frame)))
(when file
(rdebug-display-line file line)
(message (format "%d %s:%d" rdebug-source-location-ring-index
file line))))))
(defun rdebug-locring-newer ()
"Cycle through source location stopping history to get the next newer (more recently visited) location."
(with-current-buffer gud-comint-buffer
(if (equal (+ 1 rdebug-source-location-ring-index)
(ring-length rdebug-source-location-ring))
(message "At newest - Will set to wrap to oldest.")
(setq rdebug-source-location-ring-index -1))
;; else
(if (> rdebug-source-location-ring-index
(ring-length rdebug-source-location-ring))
;; else
(ring-plus1 rdebug-source-location-ring-index
(ring-length rdebug-source-location-ring)))))))
(defun rdebug-locring-newest ()
"Go to the source location of the first stopping point."
(rdebug-locring-goto (- (ring-length rdebug-source-location-ring) 1)))
(defun rdebug-locring-older ()
"Cycle through source location stopping history to get the next older (least recently visited) location."
(with-current-buffer gud-comint-buffer
(if (equal rdebug-source-location-ring-index 0)
(message "At oldest - Will set to wrap to newest.")
(setq rdebug-source-location-ring-index
(+ 1 (ring-length rdebug-source-location-ring))))
;; else
(if (or (not rdebug-source-location-ring-index)
(< rdebug-source-location-ring-index 0))
;; else
(ring-minus1 rdebug-source-location-ring-index
(ring-length rdebug-source-location-ring)))))))
(defun rdebug-locring-oldest ()
"Go to the oldest source position location."
(ring-ref rdebug-source-location-ring 0))
(provide 'rdebug-locring)
;;; Local variables:
;;; eval:(put 'rdebug-debug-enter 'lisp-indent-hook 1)
;;; End:
;;; rdebug-locring.el ends here