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+;; geiser-edit.el -- visiting source files
+
+;; Copyright (C) 2009 Jose Antonio Ortega Ruiz
+
+;; Author: Jose Antonio Ortega Ruiz <jao@gnu.org>
+;; Start date: Wed Feb 11, 2009 21:07
+
+;; This file 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.
+
+;; This file 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Comentary:
+
+;; Functions to access Scheme files and spots.
+
+;;; Code:
+
+(require 'geiser-completion)
+(require 'geiser-eval)
+(require 'geiser-base)
+
+(require 'etags)
+
+
+;;; Customization
+
+(defmacro geiser-edit--define-custom-visit (var group doc)
+  `(defcustom ,var nil
+     ,doc
+     :group ',group
+     :type '(choice (const :tag "Other window" window)
+                    (const :tag "Other frame" frame)
+                    (const :tag "Current window" nil))))
+
+(geiser-edit--define-custom-visit
+ geiser-edit-symbol-method geiser
+ "How the new buffer is opened when invoking \\[geiser-edit-symbol-at-point]")
+
+
+;;; Auxiliar functions:
+
+(defun geiser-edit--visit-file (file method)
+  (cond ((eq method 'window) (find-file-other-window file))
+        ((eq method 'frame) (find-file-other-frame file))
+        (t (find-file file))))
+
+(defsubst geiser-edit--location-file (loc)
+  (cdr (assoc 'file loc)))
+
+(defsubst geiser-edit--location-line (loc)
+  (cdr (assoc 'line loc)))
+
+(defconst geiser-edit--def-re
+  (regexp-opt '("define" "defmacro" "define-macro" "define-syntax")))
+
+(defsubst geiser-edit--def-re (symbol)
+  (format "(%s +(?%s" geiser-edit--def-re symbol))
+
+(defun geiser-edit--goto-line (symbol line)
+  (if (numberp line)
+      (goto-line line)
+    (goto-char (point-min))
+    (when (re-search-forward (geiser-edit--def-re symbol) nil t)
+      (beginning-of-line))))
+
+(defun geiser-edit--try-edit (symbol ret)
+  (let* ((loc (geiser-eval--retort-result ret))
+         (file (geiser-edit--location-file loc))
+         (line (geiser-edit--location-line loc)))
+    (unless file (error "Couldn't find edit location"))
+    (unless (file-readable-p file) (error "Couldn't open '%s' for read" file))
+    (geiser-edit--visit-file file geiser-edit-symbol-method)
+    (geiser-edit--goto-line symbol line)))
+
+
+;;; Commands:
+
+(defun geiser-edit-symbol ()
+  "Asks for a symbol to edit, with completion."
+  (interactive)
+  (let* ((symbol (geiser-completion--read-symbol "Edit symbol: "
+                                                nil
+                                                geiser-edit--symbol-history))
+         (cmd `(:gs ((:ge symbol-location) ',symbol))))
+    (geiser-edit--try-edit symbol (geiser-eval--send/wait cmd))))
+
+(defun geiser-edit-symbol-at-point (&optional arg)
+  "Opens a new window visiting the definition of the symbol at point.
+With prefix, asks for the symbol to edit."
+  (interactive "P")
+  (let* ((symbol (or (and (not arg) (symbol-at-point))
+                     (geiser-completion--read-symbol "Edit symbol: ")))
+         (cmd `(:gs ((:ge symbol-location) ',symbol)))
+         (marker (point-marker)))
+    (geiser-edit--try-edit symbol (geiser-eval--send/wait cmd))
+    (when marker (ring-insert find-tag-marker-ring marker))))
+
+(defun geiser-edit-pop-edit-symbol-stack ()
+  "Pop back to where \\[geiser-edit-symbol-at-point] was last invoked."
+  (interactive)
+  (condition-case nil
+      (pop-tag-mark)
+    (error "No previous location for find symbol invocation")))
+
+
+(provide 'geiser-edit)
+;;; geiser-edit.el ends here