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+;; geiser-image.el -- support for image display
+
+;; Copyright (c) 2012 Jose Antonio Ortega Ruiz
+
+;; This program is free software; you can redistribute it and/or
+;; modify it under the terms of the Modified BSD License. You should
+;; have received a copy of the license along with this program. If
+;; not, see <http://www.xfree86.org/3.3.6/COPYRIGHT2.html#5>.
+
+;; Author: Jose Antonio Ortega Ruiz <jao@gnu.org>
+;; Start date: Sun Sep 02, 2012 00:00
+
+
+
+(require 'geiser-custom)
+(require 'geiser-base)
+
+
+;;; Customization:
+
+(defgroup geiser-image nil
+ "Options for image displaying."
+ :group 'geiser)
+
+
+(geiser-custom--defcustom geiser-system-image-viewer "display"
+ "Which system image viewer program to invoke upon M-x
+`geiser-view-last-image'."
+ :type 'string
+ :group 'geiser-image)
+
+(geiser-custom--defcustom geiser-image-cache-keep-last 10
+ "How many images to keep in geiser's image cache."
+ :type 'integer
+ :group 'geiser-image)
+
+(geiser-custom--defcustom geiser-image-cache-dir nil
+ ;; Currently, this variable is updated, if needed, by racket during
+ ;; initialization. If/when we add image support for other
+ ;; implementations, we'll have to work with implementation-specific
+ ;; caches.
+ "Directory where generated images are stored. If nil, the
+system wide tmp dir will be used."
+ :type 'path
+ :group 'geiser-image)
+
+
+
+(defun geiser-image--list-cache ()
+ "List all the images in the image cache."
+ (and geiser-image-cache-dir
+ (file-directory-p geiser-image-cache-dir)
+ (let ((files (directory-files-and-attributes
+ geiser-image-cache-dir t "geiser-img-[0-9]*.png")))
+ (mapcar 'car
+ (sort files (lambda (a b)
+ (< (float-time (nth 6 a))
+ (float-time (nth 6 b)))))))))
+
+(defun geiser-image--clean-cache ()
+ "Clean all except for the last `geiser-image-cache-keep-last'
+images in `geiser-image-cache-dir'."
+ (interactive)
+ (dolist (f (butlast (geiser-image--list-cache) geiser-image-cache-keep-last))
+ (delete-file f)))
+
+(defun geiser-image--replace-images (inline-images-p)
+ "Replace all image patterns with actual images"
+ (with-silent-modifications
+ (save-excursion
+ (goto-char (point-min))
+ (while (re-search-forward "#<Image: \\([-+./_0-9a-zA-Z]+\\)>" nil t)
+ ;; can't pass a filename to create-image because emacs might
+ ;; not display it before it gets deleted (race condition)
+ (let* ((file (match-string 1))
+ (begin (match-beginning 0))
+ (end (match-end 0)))
+ (delete-region begin end)
+ (if (and inline-images-p (display-images-p))
+ (put-image (create-image file) begin "[image]")
+ (progn
+ (goto-char begin)
+ (insert "[image] ; use M-x geiser-view-last-image to view")))
+ (setq geiser-image-cache-dir (file-name-directory file))
+ (geiser-image--clean-cache))))))
+
+(defun geiser-view-last-image (n)
+ "Open the last displayed image in the system's image viewer.
+
+With prefix arg, open the N-th last shown image in the system's
+image viewer."
+ (interactive "p")
+ (let ((images (reverse (geiser-image--list-cache))))
+ (if (>= (length images) n)
+ (start-process "Geiser image view"
+ nil
+ geiser-system-image-viewer
+ (nth (- n 1) images))
+ (error "There aren't %d recent images" n))))
+
+
+(provide 'geiser-image)