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;;; geiser-image.el --- Support for image display -*- lexical-binding: t; -*-
;; Copyright (c) 2012, 2015 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>.
;; Authors: Michael Wilber, Jose Antonio Ortega Ruiz <jao@gnu.org>
;; Start date: Sun Sep 02, 2012 00:00
;;; Code:
(require 'geiser-custom)
(require 'geiser-base)
(require 'geiser-impl)
;;; Customization:
(defgroup geiser-image nil
"Options for image displaying."
:group 'geiser)
(geiser-custom--defcustom geiser-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
"Default directory where generated images are stored.
If nil, then the system wide tmp dir will be used."
:type 'path
:group 'geiser-image)
(geiser-custom--defface image-button
'button geiser-image "image buttons in terminal buffers")
(geiser-impl--define-caller geiser-image--cache-dir image-cache-dir ()
"Directory where generated images are stored.
If this function returns nil, then no images are generated.")
(defun geiser-image--list-cache ()
"List all the images in the image cache."
(let ((cdir (geiser-image--cache-dir nil)))
(and cdir
(file-directory-p cdir)
(let ((files (directory-files-and-attributes cdir 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--display (file)
(start-process "Geiser image view" nil geiser-image-viewer file))
(defun geiser-image--button-action (button)
(let ((file (button-get button 'geiser-image-file)))
(when (file-exists-p file) (geiser-image--display file))))
(define-button-type 'geiser-image
'action 'geiser-image--button-action
'follow-link t)
(defun geiser-image--insert-button (file)
(insert-text-button "[image]"
:type 'geiser-image
'face 'geiser-font-lock-image-button
'geiser-image-file file
'help-echo "Click to display image"))
(defun geiser-image--replace-images (inline-images-p auto-p)
"Replace all image patterns with actual images"
(let ((seen 0))
(with-silent-modifications
(save-excursion
(goto-char (point-min))
(while (re-search-forward "\"?#<Image: \\([-+.\\\\/_:0-9a-zA-Z]+\\)>\"?"
nil t)
(setq seen (+ 1 seen))
(let* ((file (match-string 1))
(begin (match-beginning 0))
(end (match-end 0)))
(delete-region begin end)
(goto-char begin)
(if (and inline-images-p (display-images-p))
(insert-image (create-image file) "[image]")
(geiser-image--insert-button file)
(when auto-p (geiser-image--display file)))))))
seen))
(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)
(geiser-image--display (nth (- n 1) images))
(error "There aren't %d recent images" n))))
(provide 'geiser-image)
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