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tumme.el 0.4.6 - code included


From: Mathias Dahl
Subject: tumme.el 0.4.6 - code included
Date: 21 May 2005 14:45:36 +0200
User-agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.3

 As tumme.el is rapidly growing, some people seems to have
trouble getting it via News. Therefore I will make two
postings, one containing only the link to EmacsWiki, where
the latest version can always be found, and one with the
full code included.

If this is a bad idea, please let me know in a private
e-mail.

Latest changes:

   Version 0.4.6, 2005-05-21
   
   * Changed `tumme-thumb-name' to always use ".jpg" as file extension
   for thumbnail files, instead of using the extension from the
   original file's name. This was a very easy way to open up for
   allowing browsing of all image file types that Emacs support,
   assuming ImageMagick supports it too.
   
   * Fixed bug in `tumme-create-thumb' `tumme-rotate-thumbnail' and
   `tumme-display-image' by adding quotes around the file names. The
   conversion failed if the file name, or path, contained a
   space. Also expanded the file name, as convert (or is it bash?)
   does not work as expected for paths like "~/.tumme...".
   
   * Fixed another "space bug" :) in `tumme-display-external'.
   
   * In call to convert, added "jpeg:" in front of the output file
   name, so that all generated files becomes JPEG files. For now, only
   useful if `tumme-temp-image-file' does not end in .jpg.

Enjoy, and happy tumming!

/Mathias

;;; tumme.el --- use dired to browse your images as
    thumbnails, and more

;; Copyright (C) 2005 Mathias Dahl

;; Version: 0.4.6
;; Keywords: images, thumbnails, dired
;; Author: Mathias Dahl <address@hidden>
;; Maintainer: Mathias Dahl
;; URL: http://www.emacswiki.org/cgi-bin/wiki/Tumme

;; This file is not part of GNU Emacs.

;; This 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 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; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.

;;; Commentary:

;; BACKGROUND
;; ==========
;;
;;  I needed a program to browse, organize and tag my pictures. I got
;; tired of the old gallery program I used as it did not allow
;; multi-file operations easily. Also, it put things out of my
;; control. Image viewing programs I tested did not allow multi-file
;; operations or did not do what I wanted it to.
;;
;;  So, I got the idea to use the wonderful functionality of emacs and
;; `dired' to do it. It would allow me to do almost anything I wanted,
;; which is basically just to browse all my pictures in an easy way,
;; letting me manipulate and tag them in various ways. `dired' already
;; provide all the file handling and navigation facilities; I only
;; needed to add some functions to display the images.
;;
;;  I briefly tried out thumbs.el, and although it seemed more
;; powerful than this package, it did not work the way I wanted to. It
;; was too slow to created thumbnails of all files in a directory (I
;; currently keep all my 2000+ images in the same directory) and
;; browsing the thumbnail buffer was slow too. tumme.el will not
;; create thumbnails until they are needed and the browsing is done
;; quickly and easily in dired. I copied a great deal of ideas and
;; code from there though... :)
;;
;;  About the name: tumme means thumb in Swedish and it is used for
;; working with thumbnails, so... :)
;;
;;  `tumme' stores the thumbnail files in `tumme-dir' using the file
;; name format ORIGNAME.thumb.ORIGEXT. For example
;; ~/.tumme/myimage01.thumb.jpg. The "database" is for now just a
;; plain text file with the following format:
;;
;; file-name-non-directory;comment:comment-text;tag1;tag2;tag3;...;tagN
;;
;;
;; PREREQUISITES
;; =============
;;
;; * The ImageMagick package. Currently, `convert' and `mogrify' are
;; used. Find it here: http://www.imagemagick.org
;;
;; * For `tumme-get-exif-file-name' and
;; `tumme-copy-with-exif-file-name' to work, the command line tool
;; `exif' is needed. It can be found here:
;; http://sourceforge.net/projects/libexif/.
;;
;; * For tumme to work well, all images should have unique names. This
;; is because each thumbnail file name is generated using the original
;; image file's base file name, and all thumbnail files are stored in
;; the same directory. Also, due to the way the database is designed,
;; unique image file names is a must. This might change, but not any
;; time soon... If image names are not unique, tumme will probably not
;; crash or anything, but there will be a mismatch when looking at
;; thumbnails and tags for one of two images with the same file name
;; will also be seen on the other (to be more exact, only one instance
;; of that file name will be in the database). You have been warned!
;;
;;  This scheme works well for me, I keep all my digital photos
;; (2000+) in the same folder, copying them there from my digital
;; camera's mounted memory card using `tumme-copy-with-exif-file-name'
;; which makes them unique. Read the documentation for that function
;; for more information.
;;
;;
;; USAGE
;; =====
;;
;; First, do M-x tumme-dired-folder RET. This will setup a useful
;; window configuration for you.
;;
;; Next, do M-x tumme-setup-dired-keybindings RET, which will set up
;; keybindings and a menu name Tumme in dired mode.
;;
;; Start of viewing thumbnails by doing C-S-n and C-S-p to go up and
;; down in the dired buffer while at the same time displaying a
;; thumbnail image.
;;
;; Next, try `tumme-display-thumbs' (C-td). If no file is marked, one
;; thumbnail will show up in the *tumme* buffer. If one or more files
;; are marked, all of them will be displayed.
;;
;; Pressing TAB will switch to the window containing the *tumme*
;; buffer. In there you can move between thumbnail images and display
;; a semi-sized version in an Emacs buffer (RET), or the original
;; image in an external viewer (C-RET). By pressing SPC or DEL you
;; will navigate back and fort while at the same time displaying each
;; image in Emacs. You can also navigate using arrow keys. Comment a
;; file by pressing "c". Press TAB to get back to dired.
;;
;; While in dired mode, you can tag and comment files, you can tell
;; `tumme' to mark files with a certain tag (using a regexp) etc.
;;
;; The easiest way to see the available commands is to use the Tumme
;; menus added in tumme-mode and dired-mode.
;;
;;
;; LIMITATIONS
;; ===========
;;
;; * Only tested on GNU Emacs 21.3.2 under Mandrake Linux. I have got
;; reports that `insert-image' does not work on XEmacs. I will
;; probably never try to fix that, sorry. This project was mostly
;; aimed at fixing my own itch, and I am not interested in installing
;; and using XEmacs.
;;
;; * In order to work well, `tumme' require that all your images have
;; unique names. The reason is the way thumbnail file names are
;; generated. I will probably not fix this problem as my images all
;; have unique names.
;;
;; * Supports all image formats that Emacs and convert supports, but
;; the thumbnails are hard-coded to JPEG format.
;;
;; * WARNING: The "database" format used might be changed so keep a
;; backup of `tumme-db-file' when testing new versions.
;;
;;
;; CHANGE HISTORY
;; ==============
;;
;; Version 0.1, 2005-04-16
;;
;; * First release, only browsing support for now.
;;
;; Version 0.2, 2005-04-21
;;
;; * Changed calls to dired-filename-at-point to dired-get-filename
;;
;; Version 0.3, 2005-04-25
;;
;;   Quite a lot of changes:
;;
;; * Added basic image tagging support. No commands that make use of
;;   it yet.
;;
;; * Added text properties for the thumbnail images to be able to
;;   track where they came from originally. Used in `tumme-mode'.
;;
;; * Added `tumme-mode' to be used when navigating the thumbnail
;;   buffer.  Currently, there are commands to mark, unmark, flag and
;;   jump to the original file in associated dired buffer.
;;
;; * When moving around in the thumbnail buffer (in `tumme-mode'), the
;;   user can turn on tracking of the movements and let them be
;;   mirrored in the associated dired buffer.
;;
;; * In this version I have been looking at some ideas in thumbs.el,
;;   for example the image margin and relief and the `thumbs-mode'
;;   which I copied and made the `tumme-mode' from.
;;
;; Version 0.4, 2005-05-02
;;
;; * Renamed the functions that are to be used in `tumme-mode' in the
;;   thumbnail buffer.
;;
;; * The mark, unmark and flag commands in `tumme-mode' now also moves
;;   to next thumbnail, like how dired normally works.
;;
;; * Added `tumme-mode-line-up', `tumme-display-thumbs-append' and
;;   `tumme-mode-delete-char'.
;;
;; * Each thumbnail's tags is now displayed when navigating among the
;;   thumbnails in the thumbnail buffer.
;;
;; * Added simple slideshow functionality.
;;
;; Version 0.4.1, 2005-05-05
;;
;; * Fixed bug in `tumme-flag-thumb-original-file'
;;
;; * Added commands to display original image in external viewer
;;   (`tumme-display-external') and in a Emacs buffer
;;   (`tumme-display-image').
;;
;; * Minor code clean-up
;;
;; * Renamed some functions back again...
;;
;; * Added rotation of thumbnail images (90 degrees left and right)
;;
;; Version 0.4.2, 2005-05-06
;;
;; * Removed need for `tumme-display-image-size' in
;;   `tumme-display-image'. Now, the maximum image size that fits in
;;   *tumme-display* is calculated automatically. Introduced two
;;   correction variables, `tumme-display-window-width-correction' and
;;   `tumme-display-window-height-correction' to be used to correct
;;   width and height depending on width and height of window
;;   decorations, fringes etc. This works really well!
;;
;; Version 0.4.3, 2005-05-07
;;
;; * Added menus to `dired-mode' and `tumme-mode'
;;
;; * Added `tumme-mark-and-display-next'
;;
;; * Added `tumme-jump-thumbnail-buffer'
;;
;; * Bound TAB in `dired-mode-map' and `tumme-mode-map' to
;;   `tumme-jump-thumbnail-buffer' and
;;   `tumme-jump-original-dired-buffer', respectively.
;;
;; * Changed `tumme-display-image' to be more general. Now, it can be
;;   used from both thumbnail buffer and dired buffer by calling
;;   `tumme-display-thumbnail-original-image' and
;;   `tumme-display-dired-image', respectively.
;;
;; Version 0.4.4, 2005-05-10
;;
;; * Added `tumme-get-exif-file-name' and
;; `tumme-copy-with-exif-file-name'. These commands might not be
;; useful for all people because they are very specific. See the
;; documentation for each function for more information.
;;
;; * Added `tumme-display-next-thumbnail-original' and
;; `tumme-display-previous-thumbnail-original' to be used for easy
;; image browsing in thumbnail buffer.
;;
;; * Added support for comments. New function
;; `tumme-comment-thumbnail' added, to be used in thumbnail buffer.
;;
;; * Added `tumme-mark-tagged-files'. Use it in dired buffer to mark
;; tagged files.
;;
;; * Added `mouse-face' property `highlight' for mouse highlighting
;; and had to add a space between each thumbnail to avoid whole rows
;; to be highlighted.  Doing this meant that I had to update
;; `tumme-line-up' too...
;;
;; * Added `tumme-mouse-display-image'. Use mouse-2 to display image
;; thumbnail when is highlighted.
;;
;; * As suggested by Ehud Karni on gnu.emacs.help, changed
;; `tumme-window-DIMENSION-pixels' to use `frame-char-DIMENSION'
;; instead of `frame-pixel-DIMENSION'. Feels better
;;
;; * Corrected a bug in `tumme-window-height-pixels'. I did not know
;; that the mode-line consumed one line. Also, after experimenting, it
;; seems that the only correction needed for the image display width
;; is one single pixel. I left the corection variables in there, just
;; in case someone has a system that differs.
;;
;; Version 0.4.5, 2005-05-19
;;
;; * Added `tumme-line-up-dynamic' that calculates the number of
;; thumbnails that will fit in the thumbnail buffer's window and
;; `tumme-line-up-interactive' that asks the user.
;;
;; * Changed `tumme-display-thumbs' to call one of the `tumme-line-up'
;; functions instead of doing the line-up itself.
;;
;; * Finally! Added experimental gallery creation. See customizable
;; variables `tumme-gallery-dir', `tumme-gallery-image-root-url' and
;; `tumme-gallery-thumb-image-root-url' and new command
;; `tumme-gallery-generate'. Not beatiful, but it works quite
;; well. Probably needs some CSS-stuff in it eventually. Also, I'm not
;; sure this is the way I want to generate my image galleries in the
;; future. After all, static pages cannot do what dynamic pages using
;; PHP et al can do. Serves like a proof-of-concept of the tagging
;; though.
;;
;; * Added option to hide images with certain tags. See
;; `tumme-gallery-hidden-tags'.
;;
;; * Added `tumme-tag-thumbnail' for tagging files from thumbnail
;; buffer.
;;
;; * Added `tumme-tag-remove' and `tumme-tag-thumbnail-remove' so that
;; you can remove tags. Sorry if I have kept you waiting for
;; this... :)
;;
;; * Added option `tumme-append-when-browsing' and new command
;; `tumme-toggle-append-browsing'.
;;
;; Version 0.4.6, 2005-05-21
;;
;; * Changed `tumme-thumb-name' to always use ".jpg" as file extension
;; for thumbnail files, instead of using the extension from the
;; original file's name. This was a very easy way to open up for
;; allowing browsing of all image file types that Emacs support,
;; assuming ImageMagick supports it too.
;;
;; * Fixed bug in `tumme-create-thumb' `tumme-rotate-thumbnail' and
;; `tumme-display-image' by adding quotes around the file names. The
;; conversion failed if the file name, or path, contained a
;; space. Also expanded the file name, as convert (or is it bash?)
;; does not work as expected for paths like "~/.tumme...".
;;
;; * Fixed another "space bug" :) in `tumme-display-external'.
;;
;; * In call to convert, added "jpeg:" in front of the output file
;; name, so that all generated files becomes JPEG files. For now, only
;; useful if `tumme-temp-image-file' does not end in .jpg.
;;
;;
;; TODO
;; ====
;;
;; * Find some way of toggling on and off really nice keybindings in
;; dired (for example, using C-n or <down> instead of C-S-n).
;;
;; * Commands to create simple HTML-albums, where the images will be
;; browsable per tag, date file name etc.
;;
;; UPDATE: Simle generation of tag pages finished, date-browsing yet
;; to be added. Also, at least add class-tags and some way to include
;; CSS from a configurable file.
;;
;; * Some sort of EXIF support using an external EXIF tool.
;;
;; * Rewrite `tumme-modify-mark-on-thumb-original-file' to be less
;; ugly.
;;
;; * In some way keep track of buffers and windows and stuff so that
;; it works as the user expects.
;;
;; * Lossless rotate of JPEG files using JpegTRAN. Note to myself:
;; JpegTRAN destroys EXIF data!
;;
;; * Support other formats than JPEG
;;
;; * More/better documentation
;;

;;; Code:

(defgroup tumme nil
  "Use dired to browse your images as thumbnails, and more."
  :prefix "tumme-"
  :group 'files)

(defcustom tumme-dir "~/.tumme/"
  "*Directory where thumbnail images for are stored."
  :type 'string
  :group 'tumme)

(defcustom tumme-db-file "~/.tumme/.tumme_db"
  "*Database file where file names and their associated tags are stored."
  :type 'string
  :group 'tumme)

(defcustom tumme-temp-image-file "~/.tumme/.tumme_temp"
  "*Name of temporary image file used by `tumme-display-image'"
  :type 'string
  :group 'tumme)

(defcustom tumme-gallery-dir "~/.tumme/.tumme_gallery"
  "*Directory to store generated gallery html pages. This path needs
to be \"shared\" to the public so that it can access the index.html
page that tumme creates."
  :type 'string
  :group 'tumme)

(defcustom tumme-gallery-image-root-url
"http://your.own.server/tummepics";
  "*URL where the full size images are to be found. Note that this
path has to be configured in your web server. Tumme expects to find
pictures in this directory."
  :type 'string
  :group 'tumme)

(defcustom tumme-gallery-thumb-image-root-url
"http://your.own.server/tummethumbs";
  "*URL where the thumbnail images are to be found. Note that this
path has to be configured in your web server. Tumme expects to find
pictures in this directory."
  :type 'string
  :group 'tumme)

(defcustom tumme-gallery-hidden-tags
  (list "private" "hidden" "pending")
  "*List of \"hidden\" tags.  Used by `tumme-gallery-generate' to
leave out \"hidden\" images."
  :type '(repeat string)
  :group 'tumme)

(defcustom tumme-thumb-size 100
  "Size of thumbnails, in pixels"
  :type 'integer
  :group 'tumme)

(defcustom tumme-thumb-relief 2
  "*Size of button-like border around thumbnails."
  :type 'integer
  :group 'tumme)

(defcustom tumme-thumb-margin 2
  "*Size of the margin around thumbnails.
This is where you see the cursor."
  :type 'integer
  :group 'tumme)

(defcustom tumme-line-up-method 'dynamic
  "*Default method for line-up of thumbnails in thumbnail buffer. Used
by `tumme-display-thumbs' and other functions that needs to line-up
thumbnails. Dynamic means to use the available width of the window
containing the thumbnail buffer, Fixed means to use
`tumme-thumbs-per-row', Interactive is for asking the user, and No
line-up means that no automatic line-up will be done."
  :type '(choice :tag "Default line-up method"
                 (const :tag "Dynamic" dynamic)
                 (const :tag "Fixed" fixed)
                 (const :tag "Interactive" interactive)
                 (const :tag "No line-up" none))
  :group 'tumme)

(defcustom tumme-thumbs-per-row 3
  "*Number of thumbnails to display per row in thumb buffer."
  :type 'integer
  :group 'tumme)

(defcustom tumme-display-window-width-correction 1
  "*Number to be used to correct image display window height if the
default (1) does not work (i.e. if the image does not completely fit)"
  :type 'integer
  :group 'tumme)

(defcustom tumme-display-window-height-correction 0
  "*Number to be used to correct image display window height if the
default (0) does not work (i.e. if the image does not completely fit)"
  :type 'integer
  :group 'tumme)

(defcustom tumme-track-movement nil
  "The current state of the tracking and mirroring. For more
information, see the documentation for
`tumme-track-movement-in-dired'"
  :type 'boolean
  :group 'tumme)

(defcustom tumme-append-when-browsing nil
  "If non-nil, using `tumme-next-line-and-display' and
`tumme-previous-line-and-display' will leave a trail of thumbnail
images in the thumbnail buffer. If you enable this and want to clean
the thumbnail buffer because it is filled with too many thumbmnails,
just do C-t ., `tumme-display-thumb' to display only the image at
point. This value can be toggled using
`tumme-toggle-append-browsing'."
  :type 'boolean
  :group 'tumme)

(defcustom tumme-dired-disp-props t
  "If non-nil, display properties for dired file when using
`tumme-next-line-and-display', `tumme-previous-line-and-display' and
`tumme-mark-and-display-next'. If the database file is large, this can
slow down browsing and you might want to turn it off."
  :type 'boolean
  :group 'tumme)

(defcustom tumme-external-viewer "qiv -t"
  "*Name of external viewer, including parameters, to use when
displaying original image from `tumme-mode'"
  :type 'string
  :group 'tumme)

(defcustom tumme-main-image-directory "~/pics"
  "*Name of main image directory, if any. Used by
`tumme-copy-with-exif-file-name'."
  :type 'string
  :group 'tumme)

(defun tumme-ins-img (file original-file-name
                           associated-dired-buffer)
  "Insert thumbnail image."
  (let ((i `(image :type ,'jpeg
                   :file ,file
                   :relief ,tumme-thumb-relief
                   :margin ,tumme-thumb-margin)))
    (setq beg (point))
    (insert-image i)
    (setq end (point))
    (add-text-properties
     beg end
     (list 'tumme-thumbnail t
           'original-file-name original-file-name
           'associated-dired-buffer associated-dired-buffer
           'tags (tumme-list-tags original-file-name)
           'mouse-face 'highlight
           'comment (tumme-get-comment original-file-name)))))

(defun tumme-thumb-name (file)
  "Return thumbnail file name for FILE. Always use jpg as file
extension."
  (format "%s%s.thumb.jpg"
          (expand-file-name tumme-dir)
          (file-name-sans-extension (file-name-nondirectory file))))

(defun tumme-create-thumb (file)
  "Using the convert program, create thumbnail image for FILE and
place it in `tumme-dir'"
  (let* ((size (int-to-string tumme-thumb-size))
         (command
          (format
           (concat
            "convert -size %sx%s \"%s\" "
            " -resize %sx%s +profile \"*\" jpeg:\"%s\"")
           size size
           file
           size size
           (expand-file-name (tumme-thumb-name file)))))
    (if (file-exists-p tumme-dir)
        (if (not (file-directory-p tumme-dir))
            (error "%s exists but is not a directory!" tumme-dir))
      (make-directory tumme-dir))
    (shell-command command nil)))

(defun tumme-next-line-and-display ()
  "Move to next dired line and display thumbnail image"
  (interactive)
  (dired-next-line 1)
  (tumme-display-thumbs
   t (or tumme-append-when-browsing nil))
  (if tumme-dired-disp-props
      (tumme-dired-display-properties)))

(defun tumme-previous-line-and-display ()
  "Move to previous dired line and display thumbnail image"
  (interactive)
  (dired-previous-line 1)
  (tumme-display-thumbs
   t (or tumme-append-when-browsing nil))
  (if tumme-dired-disp-props
      (tumme-dired-display-properties)))

(defun tumme-toggle-append-browsing ()
  "Toggle `tumme-append-when-browsing'"
  (interactive)
  (setq tumme-append-when-browsing
        (not tumme-append-when-browsing))
  (message "Append browsing %s."
           (if tumme-append-when-browsing
               "on"
             "off")))

(defun tumme-mark-and-display-next ()
  "Mark current file, move to next dired line and display thumbnail
image"
  (interactive)
  (dired-mark 1)
  (tumme-display-thumbs t)
  (if tumme-dired-disp-props
      (tumme-dired-display-properties)))

(defun tumme-create-thumb-buffer ()
  "Create thumb buffer and set `tumme-mode'"
  (let ((buf (get-buffer-create "*tumme*")))
    (save-excursion
      (set-buffer buf)
      (setq buffer-read-only t)
      (if (not (eq major-mode 'tumme-mode))
          (tumme-mode)))
    buf))

(defun tumme-dired-folder ()
  "Convenience command that:

 - Opens dired in folder specified by the user
 - Splits windows in most useful (?) way
 - Set truncate-lines to t
"
  (interactive)
  (let ((buf (tumme-create-thumb-buffer))
        (buf2 (get-buffer-create "*tumme-display*")))
    (call-interactively 'dired)
    (split-window-horizontally)
    (setq truncate-lines t)
    (save-excursion
      (other-window 1)
      (switch-to-buffer buf)
      (split-window-vertically)
      (other-window 1)
      (switch-to-buffer buf2)
      (other-window -2))))

(defun tumme-display-thumbs (&optional arg append)
  "Display thumbnail images of all marked files in buffer *tumme*. If
a thumbnail image does not exist for a file, it is created on the
fly. With prefix arg, display only thumbnail for file at point (this
is useful if you have marked some files but want to show another
one).

Recommended usage is to split the current frame horizontally so that
you have the dired buffer in the left window and the *tumme* buffer in
the right window.
"
  (interactive "P")
  (let ((buf (tumme-create-thumb-buffer))
        curr-file thumb-name files count dired-buf beg)
    (if arg
        (setq files (list (dired-get-filename)))
      (setq files (dired-get-marked-files)))
    (setq dired-buf (current-buffer))
    (save-excursion
      (set-buffer buf)
      (setq inhibit-read-only t)
      (if (not append)
          (erase-buffer)
        (goto-char (point-max)))
      (mapcar
       (lambda (curr-file)
         (setq thumb-name (tumme-thumb-name curr-file))
         (if (not (file-exists-p thumb-name))
             (if (not (= 0 (tumme-create-thumb curr-file)))
                 (error "Thumb could not be created")))
         (tumme-ins-img thumb-name curr-file dired-buf))
       files)
      (setq inhibit-read-only nil)
      (cond ((eq 'dynamic tumme-line-up-method)
             (tumme-line-up-dynamic))
            ((eq 'fixed tumme-line-up-method)
             (tumme-line-up))
            ((eq 'interactive tumme-line-up-method)
             (tumme-line-up-interactive))
            ((eq 'none tumme-line-up-method)
             nil)
            (t
             (tumme-line-up-dynamic))))))

(defun tumme-write-tag (file tag)
  "Internal function that writes tag TAG for file FILE to the image
database."
  (save-excursion
    (let (end buf)
      (setq buf (find-file tumme-db-file))
      (goto-char (point-min))
      (if (search-forward-regexp
           (format "^%s" (file-name-nondirectory file)) nil t)
          (progn
            (end-of-line)
            (setq end (point))
            (beginning-of-line)
            (if (not (search-forward (format ";%s" tag) end t))
                (progn
                  (end-of-line)
                  (insert (format ";%s" tag)))))
        (goto-char (point-max))
        (insert (format "\n%s;%s" (file-name-nondirectory file) tag)))
      (save-buffer)
      (kill-buffer buf))))

(defun tumme-remove-tag (file tag)
  "Internal function that remove tag TAG for image file FILE to the
image database."
  (save-excursion
    (let (end buf start)
      (setq buf (find-file tumme-db-file))
      (goto-char (point-min))
      (if (search-forward-regexp
           (format "^%s" (file-name-nondirectory file)) nil t)
          (progn
            (end-of-line)
            (setq end (point))
            (beginning-of-line)
            (if (search-forward-regexp (format "\\(;%s\\)" tag) end t)
                (progn
                  (delete-region (match-beginning 1) (match-end 1))
                  ;; Check if file should still be in the database. If
                  ;; it has no tags or comments, it fill be removed.
                  (end-of-line)
                  (setq end (point))
                  (beginning-of-line)
                  (if (not (search-forward ";" end t))
                      (progn
                        (kill-line 1)
                        (y-or-n-p "next")
                        ))
                  (save-buffer)))))
      (kill-buffer buf))))

(defun tumme-list-tags (file)
  "Internal function that reads all tags for image file FILE from the
image database."
  (save-excursion
    (let (end buf (tags ""))
      (setq buf (find-file tumme-db-file))
      (goto-char (point-min))
      (if (search-forward-regexp
           (format "^%s" (file-name-nondirectory file)) nil t)
          (progn
            (end-of-line)
            (setq end (point))
            (beginning-of-line)
            (if (search-forward ";" end t)
                (if (search-forward "comment:" end t)
                    (if (search-forward ";" end t)
                        (setq tags (buffer-substring (point) end)))
                  (setq tags (buffer-substring (point) end))))))
      (kill-buffer buf)
      (split-string tags ";"))))

(defun tumme-tag-files (arg)
  "Tag marked file(s) in dired. With prefix arg, tag file at point."
  (interactive "P")
  (let ((tag (read-string "Tag: "))
        curr-file files)
    (if arg
        (setq files (list (dired-get-filename)))
      (setq files (dired-get-marked-files)))
    (mapcar
     (lambda (curr-file)
       (tumme-write-tag curr-file tag))
     files)))

(defun tumme-tag-thumbnail ()
  "Tag current thumbnail"
  (interactive)
  (let ((tag (read-string "Tag: ")))
    (tumme-write-tag (tumme-original-file-name) tag)))

(defun tumme-tag-remove (arg)
  "Remove tag for selected file(s)."
  (interactive "P")
  (let ((tag (read-string "Tag: "))
        curr-file files)
    (if arg
        (setq files (list (dired-get-filename)))
      (setq files (dired-get-marked-files)))
    (mapcar
     (lambda (curr-file)
       (tumme-remove-tag curr-file tag))
     files)))

(defun tumme-tag-thumbnail-remove ()
  "Remove tag from thumbnail"
  (interactive)
  (let ((tag (read-string "Tag: ")))
    (tumme-remove-tag (tumme-original-file-name) tag)))

(defun tumme-original-file-name ()
  (get-text-property (point) 'original-file-name))

(defun tumme-associated-dired-buffer ()
  (get-text-property (point) 'associated-dired-buffer))

(defun tumme-track-original-file ()
  "Track the original file in the associated dired buffer. See
documentation for `tumme-track-movement-in-dired'. Interactive use
only useful if `tumme-track-movement' is off."
  (interactive)
  (let ((old-buf (current-buffer))
        (dired-buf (tumme-associated-dired-buffer))
        (file-name (tumme-original-file-name)))
    (if (and dired-buf file-name)
        (progn
          (setq file-name (file-name-nondirectory file-name))
          (switch-to-buffer-other-window dired-buf)
          (goto-char (point-min))
          (if (not (search-forward file-name nil t))
              (message "Could not track file")
            (dired-move-to-filename))
          (switch-to-buffer-other-window old-buf)))))

(defun tumme-track-movement-in-dired ()
  "Turn on and off `tumme-track-movement' - tracking of the movements
in the thumbnail buffer so that they are \"mirrored\" in the
associated dired buffer. When this is on, moving around in the
thumbnail buffer will find the original file in the associated dired
buffer (where the image-insertion was done from) and place the cursor
on the correct file."
  (interactive)
  (setq tumme-track-movement (not tumme-track-movement))
  (message "Tracking %s" (if tumme-track-movement "on" "off")))

(defun tumme-forward-char ()
  "Move to next image and display properties"
  (interactive)
  (forward-char)
  (while (and (not (eobp))
              (not (tumme-image-at-point-p)))
    (forward-char))
  (if tumme-track-movement
      (tumme-track-original-file))
  (tumme-display-thumb-properties))

(defun tumme-forward-char ()
  "Move to next image and display properties"
  (interactive)
  (forward-char)
  (if (looking-at "[\n ]")
      (forward-char))
  (if tumme-track-movement
      (tumme-track-original-file))
  (tumme-display-thumb-properties))


(defun tumme-backward-char ()
  "Move to previous image and display properties"
  (interactive)
  (backward-char)
  (while (and (not (eobp))
              (not (tumme-image-at-point-p)))
    (backward-char))
  (if tumme-track-movement
      (tumme-track-original-file))
  (tumme-display-thumb-properties))

(defun tumme-backward-char ()
  "Move to previous image and display properties"
  (interactive)
  (backward-char)
  (if (looking-at "[\n ]")
      (backward-char))
  (if tumme-track-movement
      (tumme-track-original-file))
  (tumme-display-thumb-properties))

(defun tumme-next-line ()
  "Move to next line and display properties"
  (interactive)
  (next-line 1)
  (if tumme-track-movement
      (tumme-track-original-file))
  (tumme-display-thumb-properties))

(defun tumme-previous-line ()
  "Move to previous line and display properties"
  (interactive)
  (previous-line 1)
  (if tumme-track-movement
      (tumme-track-original-file))
  (tumme-display-thumb-properties))

(defun tumme-display-thumb-properties ()
  "Display thumbnail properties in the echo area"
  (if (not (eobp))
      (let ((file-name (tumme-original-file-name))
            (dired-buf (tumme-associated-dired-buffer))
            (props (get-text-property (point) 'tags))
            (comment (get-text-property (point) 'comment)))
        (if file-name
            (message "%s %s%s"
                     (file-name-nondirectory
                      file-name)
                     (or props
                         "(no tags)")
                     (if comment
                         (format ": %s" comment)
                       " [no comment]"))))))

(defun tumme-modify-mark-on-thumb-original-file (command)
  "This is quite ugly but I don't know how to implemented in a better
way."
  (let ((file-name (tumme-original-file-name))
        (dired-buf (tumme-associated-dired-buffer)))
    (if (not (and dired-buf file-name))
        (message "No image, or image with correct properties, at point.")
      (save-excursion
        (message file-name)
        (setq file-name (file-name-nondirectory file-name))
        (set-buffer dired-buf)
        (goto-char (point-min))
        (if (search-forward file-name nil t)
            (cond ((eq command 'mark) (dired-mark 1))
                  ((eq command 'unmark) (dired-unmark 1))
                  ((eq command 'flag) (dired-flag-file-deletion 1))))))))

(defun tumme-mark-thumb-original-file ()
  "Mark original image file in associated dired buffer"
  (interactive)
  (tumme-modify-mark-on-thumb-original-file 'mark)
  (tumme-forward-char))

(defun tumme-unmark-thumb-original-file ()
  "Unmark original image file in associated dired buffer"
  (interactive)
  (tumme-modify-mark-on-thumb-original-file 'unmark)
  (tumme-forward-char))

(defun tumme-flag-thumb-original-file ()
  "Flag original image file for deletion in associated dired buffer"
  (interactive)
  (tumme-modify-mark-on-thumb-original-file 'flag)
  (tumme-forward-char))

(defun tumme-jump-original-dired-buffer ()
  "Jump to the dired buffer associated with the current image
file. You probably want to use this together with
`tumme-track-original-file'"
  (interactive)
  (let ((window (tumme-associated-dired-buffer-window)))
    (if window
        (select-window window)
      (message "Associated dired buffer not visible"))))

(defun tumme-jump-thumbnail-buffer ()
  "Jump to thumbnail buffer"
  (interactive)
  (let ((window (tumme-thumbnail-window)))
    (if window
        (select-window window)
      (message "Thumbnail buffer not visible"))))

(defvar tumme-mode-map (make-sparse-keymap)
  "Keymap for `tumme-mode'")

(defvar tumme-mode-line-up-map (make-sparse-keymap)
  "Keymap for line-up commands in `tumme-mode'")

(defvar tumme-mode-tag-map (make-sparse-keymap)
  "Keymap for tag commands in `tumme-mode'")

(defun tumme-define-keymap ()

  ;; Keys
  (define-key tumme-mode-map [right] 'tumme-forward-char)
  (define-key tumme-mode-map [left] 'tumme-backward-char)
  (define-key tumme-mode-map [up] 'tumme-previous-line)
  (define-key tumme-mode-map [down] 'tumme-next-line)
  (define-key tumme-mode-map "\C-f" 'tumme-forward-char)
  (define-key tumme-mode-map "\C-b" 'tumme-backward-char)
  (define-key tumme-mode-map "\C-p" 'tumme-previous-line)
  (define-key tumme-mode-map "\C-n" 'tumme-next-line)

  (define-key tumme-mode-map "d" 'tumme-flag-thumb-original-file)
  (define-key tumme-mode-map [delete] 'tumme-flag-thumb-original-file)
  (define-key tumme-mode-map "m" 'tumme-mark-thumb-original-file)
  (define-key tumme-mode-map "u" 'tumme-unmark-thumb-original-file)
  (define-key tumme-mode-map "." 'tumme-track-original-file)
  (define-key tumme-mode-map [tab] 'tumme-jump-original-dired-buffer)

  ;; add line-up map
  (define-key tumme-mode-map "g" tumme-mode-line-up-map)

  ;; map it to "g" so that the user can press it more quickly
  (define-key tumme-mode-line-up-map "g" 'tumme-line-up-dynamic)
  ;; "f" for "fixed" number of thumbs per row
  (define-key tumme-mode-line-up-map "f" 'tumme-line-up)
  ;; "i" for "interactive"
  (define-key tumme-mode-line-up-map "i" 'tumme-line-up-interactive)

  ;; add tag map
  (define-key tumme-mode-map "t" tumme-mode-tag-map)

  ;; map it to "t" so that the user can press it more quickly
  (define-key tumme-mode-tag-map "t" 'tumme-tag-thumbnail)
  ;; "r" for "remove"
  (define-key tumme-mode-tag-map "r" 'tumme-tag-thumbnail-remove)

  (define-key tumme-mode-map "\C-m" 'tumme-display-thumbnail-original-image)
  (define-key tumme-mode-map [C-return] 'tumme-display-external)
  (define-key tumme-mode-map "l" 'tumme-rotate-thumbnail-left)
  (define-key tumme-mode-map "r" 'tumme-rotate-thumbnail-right)
  (define-key tumme-mode-map "\C-d" 'tumme-delete-char)
  (define-key tumme-mode-map " " 'tumme-display-next-thumbnail-original)
  (define-key tumme-mode-map
    (kbd "DEL") 'tumme-display-previous-thumbnail-original)
  (define-key tumme-mode-map "c" 'tumme-comment-thumbnail)
  (define-key tumme-mode-map [mouse-2] 'tumme-mouse-display-image)

  ;; Menu
  (define-key tumme-mode-map [menu-bar tumme]
    (cons "Tumme" (make-sparse-keymap "Tumme")))

  (define-key tumme-mode-map [menu-bar tumme tumme-delete-char]
    '("Delete thumbnail from buffer" . tumme-delete-char))

  (define-key tumme-mode-map [menu-bar tumme tumme-tag-thumbnail-remove]
    '("Remove tag from thumbnail" . tumme-tag-thumbnail-remove))

  (define-key tumme-mode-map [menu-bar tumme tumme-tag-thumbnail]
    '("Tag thumbnail" . tumme-tag-thumbnail))

  (define-key tumme-mode-map [menu-bar tumme tumme-comment-thumbnail]
    '("Comment thumbnail" . tumme-comment-thumbnail))

  (define-key tumme-mode-map [menu-bar tumme tumme-refresh-thumb]
    '("Refresh thumb" . tumme-refresh-thumb))
  (define-key tumme-mode-map [menu-bar tumme tumme-line-up-dynamic]
    '("Dynamic line up" . tumme-line-up-dynamic))
  (define-key tumme-mode-map [menu-bar tumme tumme-line-up]
    '("Line up thumbnails" . tumme-line-up))

  (define-key tumme-mode-map [menu-bar tumme tumme-rotate-thumbnail-left]
    '("Rotate thumbnail left" . tumme-rotate-thumbnail-left))
  (define-key tumme-mode-map [menu-bar tumme tumme-rotate-thumbnail-right]
    '("Rotate thumbnail right" . tumme-rotate-thumbnail-right))

  (define-key tumme-mode-map [menu-bar tumme tumme-track-movement-in-dired]
    '("Toggle movement tracking on/off" . tumme-track-movement-in-dired))

  (define-key tumme-mode-map [menu-bar tumme tumme-jump-original-dired-buffer]
    '("Jump to dired buffer" . tumme-jump-original-dired-buffer))
  (define-key tumme-mode-map [menu-bar tumme tumme-track-original-file]
    '("Track original" . tumme-track-original-file))

  (define-key tumme-mode-map [menu-bar tumme tumme-flag-thumb-original-file]
    '("Flag original for deletion" . tumme-flag-thumb-original-file))
  (define-key tumme-mode-map [menu-bar tumme tumme-unmark-thumb-original-file]
    '("Unmark original" . tumme-unmark-thumb-original-file))
  (define-key tumme-mode-map [menu-bar tumme tumme-mark-thumb-original-file]
    '("Mark original" . tumme-mark-thumb-original-file))

  (define-key tumme-mode-map [menu-bar tumme tumme-display-external]
    '("Display in external viewer" . tumme-display-external))
  (define-key tumme-mode-map [menu-bar tumme
                                       tumme-display-thumbnail-original-image]
    '("Display image" . tumme-display-thumbnail-original-image)))

(define-derived-mode tumme-mode
  fundamental-mode "tumme"
  "Browse and manipulate thumbnail images using dired. Use
`tumme-dired-folder' and `tumme-setup-dired-keybindings' to get a nice
setup to start with."
  (tumme-define-keymap)
  (message "tumme-mode enabled"))

(defun tumme-setup-dired-keybindings ()
  "Setup easy-to-use keybindings for the commands to be used in dired
mode."
  (interactive)

  (require 'dired)

  (define-key dired-mode-map (kbd "C-S-n") 'tumme-next-line-and-display)
  (define-key dired-mode-map (kbd "C-S-p") 'tumme-previous-line-and-display)
  (define-key dired-mode-map (kbd "C-S-m") 'tumme-mark-and-display-next)

  (define-key dired-mode-map "\C-td" 'tumme-display-thumbs)
  (define-key dired-mode-map "\C-tt" 'tumme-tag-files)
  (define-key dired-mode-map "\C-tr" 'tumme-tag-remove)
  (define-key dired-mode-map [tab] 'tumme-jump-thumbnail-buffer)
  (define-key dired-mode-map "\C-ti" 'tumme-display-dired-image)
  (define-key dired-mode-map "\C-ta" 'tumme-display-thumbs-append)
  (define-key dired-mode-map "\C-t." 'tumme-display-thumb)
  (define-key dired-mode-map "\C-tc" 'tumme-dired-comment-files)
  (define-key dired-mode-map "\C-tf" 'tumme-mark-tagged-files)

  ;; Menu for dired
  (define-key dired-mode-map [menu-bar tumme]
    (cons "Tumme" (make-sparse-keymap "Tumme")))

  (define-key dired-mode-map [menu-bar tumme tumme-copy-with-exif-file-name]
    '("Copy with EXIF file name" . tumme-copy-with-exif-file-name))

  (define-key dired-mode-map [menu-bar tumme tumme-dired-comment-files]
    '("Comment files" . tumme-dired-comment-files))

  (define-key dired-mode-map [menu-bar tumme tumme-mark-tagged-files]
    '("Mark tagged files" . tumme-mark-tagged-files))

  (define-key dired-mode-map [menu-bar tumme tumme-tag-remove]
    '("Remove tag from files" . tumme-tag-remove))

  (define-key dired-mode-map [menu-bar tumme tumme-tag-files]
    '("Tag files" . tumme-tag-files))

  (define-key dired-mode-map [menu-bar tumme tumme-jump-thumbnail-buffer]
    '("Jump to thumbnail buffer" . tumme-jump-thumbnail-buffer))

  (define-key dired-mode-map [menu-bar tumme tumme-toggle-append-browsing]
    '("Toggle append browsing" . tumme-toggle-append-browsing))

  (define-key dired-mode-map [menu-bar tumme tumme-display-dired-image]
    '("Display image" . tumme-display-dired-image))
  (define-key dired-mode-map [menu-bar tumme tumme-display-thumb]
    '("Display this thumbnail" . tumme-display-thumb))
  (define-key dired-mode-map [menu-bar tumme tumme-display-thumbs-append]
    '("Display thumbnails append" . tumme-display-thumbs-append))
  (define-key dired-mode-map [menu-bar tumme tumme-display-thumbs]
    '("Display thumbnails" . tumme-display-thumbs))

  (define-key dired-mode-map [menu-bar tumme tumme-create-thumbs]
    '("Create thumbnails for marked files" . tumme-create-thumbs))

  (define-key dired-mode-map [menu-bar tumme tumme-mark-and-display-next]
    '("Mark and display next" . tumme-mark-and-display-next))
  (define-key dired-mode-map [menu-bar tumme tumme-previous-line-and-display]
    '("Display thumb for previous file" . tumme-previous-line-and-display))
  (define-key dired-mode-map [menu-bar tumme tumme-next-line-and-display]
    '("Display thumb for next file" . tumme-next-line-and-display)))

(defun tumme-create-thumbs (&optional arg)
  "Create thumbnail images for all marked files in dired. With prefix
arg, create thumbnails even if they already exist (i.e. use this to
refresh your thumbnails)."
  (interactive "P")
  (let (curr-file thumb-name files count)
    (setq files (dired-get-marked-files))
    (mapcar
     (lambda (curr-file)
       (setq thumb-name (tumme-thumb-name curr-file))
       ;; If the user overrides the exist check, we must clear the
       ;; image cache so that if the user wants to display the
       ;; thumnail, it is not fetched from cache.
       (if arg
           (clear-image-cache))
       (if (or (not (file-exists-p thumb-name))
               arg)
           (if (not (= 0 (tumme-create-thumb curr-file)))
               (error "Thumb could not be created"))))
     files)))

(defvar tumme-slideshow-timer nil
  "Slideshow timer")

(defvar tumme-slideshow-count 0
  "Counter to keep track on how many pictures that have been displayed
during this slideshow")

(defvar tumme-slideshow-times 0
  "Number of pictures to display in slideshow")

(defun tumme-slideshow-step ()
  "Step to next file, if `tumme-slideshow-times' has not been
reached."
  (if (< tumme-slideshow-count tumme-slideshow-times)
      (progn
        (message "%s" (1+ tumme-slideshow-count))
        (setq tumme-slideshow-count (1+ tumme-slideshow-count))
        (tumme-next-line-and-display))
    (tumme-slideshow-stop)))

(defun tumme-slideshow-start ()
  "Start slideshow. Ask user for number of images to show and the
delay in between."
  (interactive)
  (setq tumme-slideshow-count 0)
  (setq tumme-slideshow-times (string-to-int (read-string "How many: ")))
  (let ((repeat (string-to-number
                 (read-string
                  "Delay, in seconds. Decimals are accepted : " "1"))))
    (setq tumme-slideshow-timer
          (run-with-timer
           0 repeat
           'tumme-slideshow-step))))

(defun tumme-slideshow-stop ()
  "Cancel slideshow"
  (interactive)
  (cancel-timer tumme-slideshow-timer))

(defun tumme-delete-char ()
  "Remove current thumbnail from thumbnail buffer and line up."
  (interactive)
  (setq inhibit-read-only t)
  (delete-char 1)
  (if (looking-at " ")
      (delete-char 1))
  (setq inhibit-read-only nil))

(defun tumme-display-thumbs-append ()
  "Like `tumme-display-thumbs', but append instead of replace
thumbnails."
  (interactive)
  (tumme-display-thumbs nil t))

(defun tumme-display-thumb ()
  "Shorthard for `tumme-display-thumbs' with prefix argument"
  (interactive)
  (tumme-display-thumbs t))

(defun tumme-line-up ()
  "Line up thumbnails according to `tumme-thumbs-per-row'. See also
`tumme-line-up-dynamic'"
  (interactive)
  (setq inhibit-read-only t)
  (goto-char (point-min))
  (while (and (not (tumme-image-at-point-p))
              (not (eobp)))
    (delete-char 1))
  (while (not (eobp))
    (forward-char)
    (while (and (not (tumme-image-at-point-p))
                (not (eobp)))
      (delete-char 1)))
  (goto-char (point-min))
  (let ((count 0))
    (while (not (eobp))
      (forward-char)
      (if (= tumme-thumbs-per-row 1)
          (insert "\n")
        (insert " ")
        (setq count (1+ count))
        (if (= count (- tumme-thumbs-per-row 1))
            (progn
              (forward-char)
              (insert "\n")
              (setq count 0))))))
  (goto-char (point-min))
  (setq inhibit-read-only nil))

(defun tumme-line-up-dynamic ()
  "Calculate how many thumbnails that will fit in the thumbnail
buffer's window and call `tumme-line-up'."
  (interactive)
  (let* ((char-width (frame-char-width))
        (width (tumme-window-width-pixels (tumme-thumbnail-window)))
        (tumme-thumbs-per-row
         (/ width
            (+ (* 2 tumme-thumb-relief)
               (* 2 tumme-thumb-margin)
               tumme-thumb-size char-width))))
    (tumme-line-up)))

(defun tumme-line-up-interactive ()
  "Ask user how many thumbnails per row to place in the thumbnail
buffer's window and call `tumme-line-up'."
  (interactive)
  (let ((tumme-thumbs-per-row
         (string-to-int (read-string "How many thumbs per row: "))))
    (if (not (> tumme-thumbs-per-row 0))
        (message "Number must be greater than 0")
      (tumme-line-up))))

(defun tumme-display-external ()
  "Display original image for thumbnail at point using external
viewer"
  (interactive)
  (let ((file (tumme-original-file-name)))
    (if (not (tumme-image-at-point-p))
        (message "No thumbnail at point")
      (if (not file)
          (message "No original file name found")
        (shell-command (format "%s \"%s\""
                               tumme-external-viewer
                               (tumme-original-file-name)))))))

(defun tumme-window-width-pixels (window)
  "Calculate window width in pixels."
    (* (window-width window) (frame-char-width)))

(defun tumme-window-height-pixels (window)
  "Calculate window height in pixels."
  ;; Note: The mode-line consumes one line
    (* (- (window-height window) 1) (frame-char-height)))

(defun tumme-display-window ()
  "Return window where *tumme-display* is visible"
  (get-window-with-predicate
   (lambda (window)
     (equal (buffer-name (window-buffer window)) "*tumme-display*"))))

(defun tumme-thumbnail-window ()
  "Return window where *tumme* is visible"
  (get-window-with-predicate
   (lambda (window)
     (equal (buffer-name (window-buffer window)) "*tumme*"))))

(defun tumme-associated-dired-buffer-window ()
  "Return window where associated dired buffer is visible"
  (let ((buf (tumme-associated-dired-buffer)))
    (if (tumme-image-at-point-p)
        (get-window-with-predicate
         (lambda (window)
           (equal (window-buffer window) buf)))
      (error "No thumbnail image at point"))))

(defun tumme-display-window-width ()
  "Return width, in pixels, of tumme's image display window"
  (- (tumme-window-width-pixels (tumme-display-window))
     tumme-display-window-width-correction))

(defun tumme-display-window-height ()
  "Return height, in pixels, of tumme's image display window"
  (- (tumme-window-height-pixels (tumme-display-window))
     tumme-display-window-height-correction))

(defun tumme-display-image (file)
  "Display image in image buffer. Use this when you want to display
the image, semi sized, in a window next to the thumbnail window -
typically a three-window configuration with dired to the left,
thumbnail window to the upper right and image window to the lower
right. The image is sized to fit the display window (using a temporary
file, don't worry). Because of this, it will not be as quick as
opening it directly, but on most modern systems it should feel snappy
enough."
  (let ((size-x (tumme-display-window-width))
        (size-y (tumme-display-window-height))
        command)
    (save-excursion
      (set-buffer "*tumme-display*")
      (erase-buffer)
      (setq command
            (format
             (concat
              "convert -size %sx%s \"%s\" "
              " -resize %sx%s +profile \"*\" jpeg:\"%s\"")
             size-x size-y
             file
             size-x size-y
             (expand-file-name tumme-temp-image-file)))
      (shell-command command nil)
      (insert-image-file tumme-temp-image-file))))

(defun tumme-display-thumbnail-original-image ()
  "Display current thumbnail's original image. See documentation for
`tumme-display-image' for more information."
  (interactive)
  (let ((file (tumme-original-file-name)))
    (if (not (string-equal major-mode "tumme-mode"))
        (message "Not in tumme-mode")
      (if (not (tumme-image-at-point-p))
          (message "No thumbnail at point")
        (if (not file)
            (message "No original file name found")
          (tumme-display-image file))))))

(defun tumme-display-dired-image ()
  "Display current image file. See documentation for
`tumme-display-image' for more information."
  (interactive)
  (tumme-display-image (dired-get-filename)))

(defun tumme-image-at-point-p ()
  "Return true if there is a tumme thumbnail at point"
  (get-text-property (point) 'tumme-thumbnail))

(defun tumme-rotate-thumbnail (degrees)
  "Rotate thumbnail DEGREES degrees"
  (if (not (tumme-image-at-point-p))
      (message "No thumbnail at point")
    (let ((file (tumme-thumb-name (tumme-original-file-name)))
          command)
      (setq command (format "mogrify -rotate %s \"%s\""
                            degrees (expand-file-name file)))
      (shell-command command nil)
      ;; Clear the cache to refresh image. I wish I could just refresh
      ;; the current file but I do not know how to do that. Yet...
      (clear-image-cache))))

(defun tumme-rotate-thumbnail-left ()
  "Rotate thumbnail left (counter clockwise) 90 degrees"
  (interactive)
  (tumme-rotate-thumbnail "-90"))

(defun tumme-rotate-thumbnail-right ()
  "Rotate thumbnail counter right (clockwise) 90 degrees"
  (interactive)
  (tumme-rotate-thumbnail "90"))

(defun tumme-refresh-thumb ()
  "Force creation of new image for current thumbnail"
  (interactive)
  (clear-image-cache)
  (tumme-create-thumb (tumme-original-file-name)))

(defun tumme-get-exif-file-name (file)
  "Uses the image's EXIF information to return a hopefully unique file
name (should be unique as long as you do not take more than one
picture per second). The original file name is suffixed at the end for
traceability. The format of the returned file name is
YYYY_MM_DD_HH_MM_DD_ORIG_FILE_NAME.jpg. Used from
`tumme-copy-with-exif-file-name'"
  (let (command ret data
                (buf (get-buffer-create "*tumme-exif*")))
    (setq command (format "exif -t DateTime %s | grep Value"
                          file))
    (save-excursion
      (set-buffer buf)
      (erase-buffer)
      (setq ret (shell-command command buf))

      (if (not (= ret 0))
          (error "Could not extract EXIF information!")

        (goto-char (point-min))

        ;; Remove all but the timestamp

        (while (search-forward "  Value: " nil t)
          (replace-match "" nil t))

        (goto-char (point-min))

        ;; Replace spaces and colons with underscore in order to get
        ;; useful file names.

        (while (search-forward-regexp "[: ]" nil t)
          (replace-match "_" nil t))

        (goto-char (point-min))

        ;; Clean buffer from newlines and carriage returns before
        ;; getting final info

        (while (search-forward-regexp "[\n\r]" nil t)
          (replace-match "" nil t))

        (setq data (buffer-substring-no-properties (point-min) (point-max)))

        (format "%s_%s" data
                (file-name-nondirectory file))))))

(defun tumme-copy-with-exif-file-name ()
  "Copy current or all marked files in dired to a new file in your
main image directory, using a file name generated by
`tumme-get-exif-file-name'. This might or might not be useful for
other people, but I use it each time I fetch images from my digital
camera, for copying the images into my main image directory.

 Typically I open up the folder where I store my incoming digital
images, with file names like dscn0319.jpg, dscn0320.jpg etc., mark the
files I want to copy into my main image directory, and execute this
function. The result is a couple of new files in
`tumme-main-image-directory' called 2005_05_08_12_52_00_dscn0319.jpg,
2005_05_08_14_27_45_dscn0320.jpg etc.

 When the images are safely in my main image directory I start to
browse and tag them using rest of the functionality in `tumme'."
  (interactive)
  (let (new-name
        (files (dired-get-marked-files)))
    (mapcar
     (lambda (curr-file)
       (setq new-name
             (format "%s/%s"
                     (expand-file-name tumme-main-image-directory)
                     (tumme-get-exif-file-name curr-file)))
       (message "Copying %s to %s" curr-file new-name)
       (copy-file curr-file new-name))
     files)))

(defun tumme-display-next-thumbnail-original ()
  "In thubnail buffer, move to next thumbnail and display the image."
  (interactive)
  (tumme-forward-char)
  (tumme-display-thumbnail-original-image))

(defun tumme-display-previous-thumbnail-original ()
  "In thubnail buffer, move to previous thumbnail and display the
image."
  (interactive)
  (tumme-backward-char)
  (tumme-display-thumbnail-original-image))

(defun tumme-write-comment (file comment)
  "Write comment COMMENT for file FILE"
  (save-excursion
    (let (end buf
              (base-name (file-name-nondirectory file)))
      (setq buf (find-file tumme-db-file))
      (goto-char (point-min))
      (if (search-forward-regexp
           (format "^%s" base-name) nil t)
          (progn
            (end-of-line)
            (setq end (point))
            (beginning-of-line)
            ;; Delete old comment, if any
            (cond ((search-forward ";comment:" end t)
                   (setq comment-beg (match-beginning 0))
                   ;; Any tags after the comment?
                   (if (search-forward ";" end t)
                       (setq comment-end (- (point) 1))
                     (setq comment-end end))
                   ;; Delete comment tag and comment
                   (delete-region comment-beg comment-end)))
            ;; Insert new comment
            (beginning-of-line)
            (if (not (search-forward ";" end t))
                (progn
                  (end-of-line)
                  (insert ";")))
            (insert (format "comment:%s;" comment)))
        ;; File does not exist in databse - add it.
        (goto-char (point-max))
        (insert (format "\n%s;comment:%s" base-name comment)))
      (save-buffer)
      (kill-buffer buf))))

(defun tumme-update-property (prop value)
  "Update text property PROP with value VALUE at point"
  (setq inhibit-read-only t)
  (put-text-property
   (point) (1+ (point))
   prop
   value)
  (setq inhibit-read-only nil))

(defun tumme-dired-comment-files ()
  "Add comment to current or marked files in dired"
  (interactive)
  (let ((files (dired-get-marked-files))
         (comment (tumme-read-comment)))
    (mapcar
     (lambda (curr-file)
       (tumme-write-comment curr-file comment))
     files)))

(defun tumme-comment-thumbnail ()
  "Add comment to current thumbnail in thumbnail buffer."
  (interactive)
  (let* ((file (tumme-original-file-name))
         (comment (tumme-read-comment file)))
    (tumme-write-comment file comment)
    (tumme-update-property 'comment comment))
  (tumme-display-thumb-properties))

(defun tumme-read-comment (&optional file)
  "Read comment, optionally using old comment from FILE as initial
value"
  (let ((comment
         (read-string
          "Comment: "
          (if file (tumme-get-comment file)))))
    comment))

(defun tumme-get-comment (file)
  "Get comment for file FILE"
  (save-excursion
    (let (end buf comment (base-name (file-name-nondirectory file)))
      (setq buf (find-file tumme-db-file))
      (goto-char (point-min))
      (if (search-forward-regexp
           (format "^%s" base-name) nil t)
          (progn
            (end-of-line)
            (setq end (point))
            (beginning-of-line)
            (cond ((search-forward ";comment:" end t)
                   (setq comment-beg (point))
                   (if (search-forward ";" end t)
                       (setq comment-end (- (point) 1))
                     (setq comment-end end))
                   (setq comment (buffer-substring
                                  comment-beg comment-end))))))
      (kill-buffer buf)
      comment)))

(defun tumme-mark-tagged-files ()
  "Use regexp to mark files with matching tag."
  (interactive)
  (let (files buf
        (tag (read-string "Mark tagged files (regexp): ")))
    (save-excursion
      (setq buf (find-file tumme-db-file))
      (goto-char (point-min))
      ;; Collect matches
      (while (search-forward-regexp
              (concat "\\(^[^;]+\\);.*" tag ".*$") nil t)
        (setq files (append (list (match-string 1)) files)))
      (kill-buffer buf)
      ;; Mark files
      (mapcar
       (lambda (curr-file)
         ;; I tried using `dired-mark-files-regexp' but it was
         ;; waaaay to slow.
         (goto-char (point-min))
         (if (search-forward-regexp (format "\\s %s$" curr-file) nil t)
             (dired-mark 1)))
       files))
    (message "%d files with matching tag marked." (length files))))

(defun tumme-mouse-display-image (event)
  (interactive "e")
  (let (file)
    (save-excursion
      (set-buffer (window-buffer (posn-window (event-end event))))
      (save-excursion
        (goto-char (posn-point (event-end event)))
        (setq file (tumme-original-file-name))))
    (select-window (posn-window (event-end event)))
    (tumme-display-image file)))

(defun tumme-dired-display-properties ()
  "Display properties for dired file in the echo area"
  (interactive)
  (let* ((file (dired-get-filename))
        (props (tumme-list-tags file))
        (comment (tumme-get-comment file)))
    (if file
        (message "%s %s%s"
                 (file-name-nondirectory file)
                 (or props
                     "(no tags)")
                 (if comment
                     (format ": %s" comment)
                   " [no comment]")))))

(defvar tumme-tag-file-list nil
  "List to store tag-file structure")

(defvar tumme-file-tag-list nil
  "List to store file-tag structure")

(defvar tumme-file-comment-list nil
  "List to store file comments")

(defun tumme-add-to-tag-file-list (tag file)
  (if tumme-tag-file-list
      (if (setq curr (assoc tag tumme-tag-file-list))
          (if (not (member file curr))
              (setcdr curr (cons file (cdr curr))))
        (setcdr tumme-tag-file-list
                (cons (list tag file) (cdr tumme-tag-file-list))))
    (setq tumme-tag-file-list (list (list tag file)))))

(defun tumme-add-to-tag-file-lists (tag file)
  "Helper function used from `tumme-create-gallery-lists'. Lisp
structures look like the following:

tumme-file-tag-list:

  ((\"filename1\" \"tag1\" \"tag2\" \"tag3\" ...)
   (\"filename2\" \"tag1\" \"tag2\" \"tag3\" ...)
   ...)

tumme-tag-file-list:

 ((\"tag1\" \"filename1\" \"filename2\" \"filename3\" ...)
  (\"tag2\" \"filename1\" \"filename2\" \"filename3\" ...)
  ...)"
  ;; Add tag to file list
  (if tumme-file-tag-list
      (if (setq curr (assoc file tumme-file-tag-list))
          (setcdr curr (cons tag (cdr curr)))
        (setcdr tumme-file-tag-list
                (cons (list file tag) (cdr tumme-file-tag-list))))
    (setq tumme-file-tag-list (list (list file tag))))
  ;; Add file to tag list
  (if tumme-tag-file-list
      (if (setq curr (assoc tag tumme-tag-file-list))
          (if (not (member file curr))
              (setcdr curr (cons file (cdr curr))))
        (setcdr tumme-tag-file-list
                (cons (list tag file) (cdr tumme-tag-file-list))))
    (setq tumme-tag-file-list (list (list tag file)))))

(defun tumme-add-to-file-comment-list (file comment)
  "Helper function used from `tumme-create-gallery-lists' Lisp
structure looks like the following:

tumme-file-comment-list:

  ((\"filename1\" . \"comment1\")
   (\"filename2\" . \"comment2\")
   ...)"
  (if tumme-file-comment-list
      (if (not (assoc file tumme-file-comment-list))
          (setcdr tumme-file-comment-list
                  (cons (cons file comment)
                        (cdr tumme-file-comment-list))))
    (setq tumme-file-comment-list (list (cons file comment)))))

(defun tumme-create-gallery-lists ()
  "Create temporary lists used by `tumme-gallery-generate'."
  (let ((buf (find-file tumme-db-file))
        end beg file)
    (setq tumme-tag-file-list nil)
    (setq tumme-file-tag-list nil)
    (setq tumme-file-comment-list nil)
    (goto-char (point-min))
    (while (not (eobp))
      (end-of-line)
      (setq end (point))
      (beginning-of-line)
      (setq beg (point))
      (if (not (search-forward ";" end nil))
          (error "Something is really wrong..."))
      (setq row-tags (split-string
                      (buffer-substring beg end) ";"))
      (setq file (car row-tags))
      (mapc
       (lambda (x)
         (if (not (string-match "^comment:\\(.*\\)" x))
             (tumme-add-to-tag-file-lists x file)
           (tumme-add-to-file-comment-list file (match-string 1 x))))
       (cdr row-tags))
      (forward-line 1))
    (kill-buffer buf))
  ;; Sort tag-file list
  (setq tumme-tag-file-list
        (sort tumme-tag-file-list
              (lambda (x y)
                (string< (car x) (car y))))))

(defun tumme-hidden-p (file)
  "Returns t if image file has a hidden tag."
  (let (hidden)
    (mapc
     (lambda (tag)
       (if (member tag tumme-gallery-hidden-tags)
           (setq hidden t)))
     (cdr (assoc file tumme-file-tag-list)))
    hidden))

(defun tumme-gallery-generate ()
  "Generate gallery pages. First we create a couple of lisp structures
from the database to make it easier to generate, then HTML-files are
created in `tumme-gallery-dir'"
  (interactive)
  (tumme-create-gallery-lists)
  (let ((tags tumme-tag-file-list)
        count curr tag index-buf tag-buf
        comment file-tags tag-link tag-link-list)
    ;; Make sure gallery root exist
    (if (file-exists-p tumme-gallery-dir)
        (if (not (file-directory-p tumme-gallery-dir))
            (error "tumme-gallery-dir is not a directory"))
      (make-directory tumme-gallery-dir))
    ;; Open index file
    (setq index-buf (find-file
                     (format "%s/index.html" tumme-gallery-dir)))
    (erase-buffer)
    (insert "<html>\n")
    (insert "  <body>\n")
    (insert "   <h2>Tumme Gallery</h2>\n")
    (insert (format "<p>\n    Gallery generated %s\n   <p>\n"
                    (current-time-string)))
    (insert "   <h3>Tag index</h3>\n")
    (setq count 1)
    ;; Pre-generate list of all tag links
    (mapc
     (lambda (curr)
       (setq tag (car curr))
       (when (not (member tag tumme-gallery-hidden-tags))
         (setq tag-link (format "<a href=\"%d.html\">%s</a>" count tag))
         (if tag-link-list
             (setq tag-link-list
                   (append tag-link-list (list (cons tag tag-link))))
           (setq tag-link-list (list (cons tag tag-link))))
         (setq count (1+ count))))
     tags)
    (setq count 1)
    ;; Main loop where we generated thumbnail pages per tag
    (mapc
     (lambda (curr)
       (setq tag (car curr))
       ;; Don't display hidden tags
       (when (not (member tag tumme-gallery-hidden-tags))
         ;; Insert link to tag page in index
         (insert (format "    %s<br>\n" (cdr (assoc tag tag-link-list))))
         ;; Open per-tag file
         (setq tag-buf (find-file
                        (format "%s/%s.html" tumme-gallery-dir count)))
         (erase-buffer)
         (insert "<html>\n")
         (insert "  <body>\n")
         (insert "  <p><a href=\"index.html\">Index</a></p>\n")
         (insert (format "  <h2>Images with tag &quot;%s&quot;</h2>" tag))
         ;; Main loop for files per tag page
         (mapc
          (lambda (file)
            (when (not (tumme-hidden-p file))
              ;; Insert thumbnail with link to full image
              (insert
               (format "<a href=\"%s/%s\"><img src=\"%s/%s\"%s></a>\n"
                       tumme-gallery-image-root-url file
                       tumme-gallery-thumb-image-root-url
                       (file-name-nondirectory (tumme-thumb-name file)) file))
              ;; Insert comment, if any
              (if (setq comment (cdr (assoc file tumme-file-comment-list)))
                  (insert (format "<br>\n%s<br>\n" comment))
                (insert "<br>\n"))
              ;; Insert links to other tags, if any
              (when (> (length
                        (setq file-tags (assoc file tumme-file-tag-list))) 2)
                (insert "[ ")
                (mapc
                 (lambda (extra-tag)
                   ;; Only insert if not file name or the main tag
                   (if (and (not (equal extra-tag tag))
                            (not (equal extra-tag file)))
                       (insert
                        (format "%s " (cdr (assoc extra-tag tag-link-list))))))
                 file-tags)
                (insert "]<br>\n"))))
          (cdr curr))
         (insert "  <p><a href=\"index.html\">Index</a></p>\n")
         (insert "  </body>\n")
         (insert "</html>\n")
         (save-buffer)
         (kill-buffer tag-buf)
         (setq count (1+ count))))
       tags)
    (insert "  </body>\n")
    (insert "</html>")
    (save-buffer)
    (kill-buffer index-buf)))

(provide 'tumme)

;;; tumme.el ends here


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