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[booh] / bin / booh-classifier

#! /usr/bin/ruby
#
#                         *  BOOH  *
#
# A.k.a 'Best web-album Of the world, Or your money back, Humerus'.
#
# The acronyn sucks, however this is a tribute to Dragon Ball by
# Akira Toriyama, where the last enemy beaten by heroes of Dragon
# Ball is named "Boo". But there was already a free software project
# called Boo, so this one will be it "Booh". Or whatever.
#
#
# Copyright (c) 2004-2006 Guillaume Cottenceau <http://zarb.org/~gc/resource/gc_mail.png>
#
# This software may be freely redistributed under the terms of the GNU
# public license version 2.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

require 'getoptlong'
require 'tempfile'

require 'gtk2'
require 'booh/libadds'

require 'gettext'
include GetText
bindtextdomain("booh")

require 'rexml/document'
include REXML

require 'booh/booh-lib'
include Booh
require 'booh/UndoHandler'


#- options
$options = [
    [ '--help',          '-h', GetoptLong::NO_ARGUMENT,       _("Get help message") ],

    [ '--verbose-level', '-v', GetoptLong::REQUIRED_ARGUMENT, _("Set max verbosity level (0: errors, 1: warnings, 2: important messages, 3: other messages)") ],
    [ '--sort-by-exif-date', '-s', GetoptLong::NO_ARGUMENT, _("Sort entries by EXIF date") ],
]

$preloader_allowed = false

def usage
    puts _("Usage: %s [OPTION]...") % File.basename($0)
    $options.each { |ary|
        printf " %3s, %-15s %s\n", ary[1], ary[0], ary[3]
    }
end

def handle_options
    parser = GetoptLong.new
    parser.set_options(*$options.collect { |ary| ary[0..2] })
    begin
        parser.each_option do |name, arg|
            case name
            when '--help'
                usage
                exit(0)

            when '--verbose-level'
                $verbose_level = arg.to_i

            when '--sort-by-exif-date'
                $sort_by_exif_date = true

            end
        end
    rescue
        puts $!
        usage
        exit(1)
    end
end

def startup_memfree
    if $startup_memfree.nil?
        meminfo = IO.readlines('/proc/meminfo').join
        meminfo =~ /MemFree:.*?(\d+)/ or return -1
        memfree = $1
        meminfo =~ /Buffers:.*?(\d+)/ and buffers = $1
        meminfo =~ /Cached:.*?(\d+)/ and cached = $1
        $startup_memfree = memfree.to_i + buffers.to_i + cached.to_i
    end
    return $startup_memfree
end

def set_cache_memory_use_figure
    
    if $config['cache-memory-use'] =~ /memfree_(\d+)/
        $config['cache-memory-use-figure'] = startup_memfree*$1.to_f/100
    else
        $config['cache-memory-use-figure'] = $config['cache-memory-use'].to_i
    end
    msg 2, _("Cache memory used: %s kB") % $config['cache-memory-use-figure']
end

def read_config
    $config = {}
    $config_file = File.expand_path('~/.booh-classifier-rc')
    if File.readable?($config_file)
        $xmldoc = REXML::Document.new(File.new($config_file))
        $xmldoc.root.elements.each { |element|
            txt = element.get_text
            if txt
                if txt.value =~ /~~~/
                    $config[element.name] = txt.value.split(/~~~/)
                else
                    $config[element.name] = txt.value
                end
            elsif element.elements.size == 0
                $config[element.name] = ''
            else
                $config[element.name] = {}
                element.each { |chld|
                    txt = chld.get_text
                    $config[element.name][chld.name] = txt ? txt.value : nil
                }
            end
        }
    end
    $config['video-viewer'] ||= '/usr/bin/mplayer %f'
    $config['browser'] ||= "/usr/bin/mozilla-firefox -remote 'openURL(%f,new-window)' || /usr/bin/mozilla-firefox %f"
    $config['preload-distance'] ||= '5'
    $config['cache-memory-use'] ||= 'memfree_80%'
    $config['rotate-set-exif'] ||= 'true'
    set_cache_memory_use_figure
end

def check_config
    missing = %w(mplayer).delete_if { |prg| system("which #{prg} >/dev/null 2>/dev/null") }
    if missing != []
        show_popup($main_window, utf8(_("The following program(s) are needed to handle videos: '%s'. Videos will be ignored.") % missing.join(', ')), { :pos_centered => true })
    end

    viewer_binary = $config['video-viewer'].split.first
    if viewer_binary && ! File.executable?(viewer_binary)
        show_popup($main_window, utf8(_("The configured video viewer seems to be unavailable.
You should fix this in Edit/Preferences so that you can view videos.

Problem was: '%s' is not an executable file.
Hint: don't forget to specify the full path to the executable,
e.g. '/usr/bin/mplayer' is correct but 'mplayer' only is not.") % viewer_binary), { :pos_centered => true, :not_transient => true })
    end
    browser_binary = $config['browser'].split.first
    if browser_binary && ! File.executable?(browser_binary)
        show_popup($main_window, utf8(_("The configured browser seems to be unavailable.
You should fix this in Edit/Preferences so that you can open URLs.

Problem was: '%s' is not an executable file.") % browser_binary), { :pos_centered => true, :not_transient => true })
    end
end

def write_config
    ios = File.open($config_file, "w")
    $xmldoc = Document.new "<booh-classifier-rc version='#{$VERSION}'/>"
    $xmldoc << XMLDecl.new(XMLDecl::DEFAULT_VERSION, $CURRENT_CHARSET)
    $config.each_pair { |key, value|
        elem = $xmldoc.root.add_element key
        if value.is_a? Hash
            $config[key].each_pair { |subkey, subvalue|
                subelem = elem.add_element subkey
                subelem.add_text subvalue.to_s
            }
        elsif value.is_a? Array
            elem.add_text value.join('~~~')
        else
            if !value
                elem.remove
            else
                elem.add_text value.to_s
            end
        end
    }
    $xmldoc.write(ios, 0)
    ios.close
end

def save_undo(name, closure, *params)
    UndoHandler.save_undo(name, closure, [ *params ])
    $undo_mb.sensitive = true
    $redo_mb.sensitive = false
end

def get_mem
    IO.readlines('/proc/self/status').join =~ /VmRSS.*?(\d+)\s*kB/
    msg 3, "RSS: #{$1}"
    return $1.to_i
end

def show_mem(*txt)
    txt.length > 0 and print txt[0]
    msg 2, "RSS: #{get_mem}"
end

class Gdk::Color
    def darker
        color = dup
        color.red = [ color.red - 10000, 0 ].max
        color.green = [ color.green - 10000, 0 ].max
        color.blue = [ color.blue - 10000, 0 ].max
        return color
    end
    def lighter
        color = dup
        color.red = [ color.red + 10000, 65535 ].min
        color.green = [ color.green + 10000, 65535 ].min
        color.blue = [ color.blue + 10000, 65535 ].min
        return color
    end
end

$color_red = Gdk::Color.new(65535, 0, 0)
$colors = [ Gdk::Color.new(0, 65535, 0),
            Gdk::Color.new(0, 0, 65535),
            Gdk::Color.new(65535, 65535, 0),
            Gdk::Color.new(0, 65535, 65535),
            Gdk::Color.new(65535, 0, 65535) ]

class Label
    attr_accessor :color, :name, :button
    def initialize(name)
        @name = name
    end
end

class Entry
    @@thumbnails_height = 64
    @@max_width = nil
    def Entry.thumbnails_height
        return @@thumbnails_height
    end

    attr_accessor :path, :type, :angle, :button, :image, :alignment, :removed, :labeled

    def initialize(path, type)
        @path = path
        @type = type
        if @@max_width.nil?
            @@max_width = $main_window.root_window.size[0] - $labels_vbox.allocation.width - ( $videoborder_pixbuf.width + MainView.borders_thickness) * 2
        end
    end

    def pixbuf_full
        if @pixbuf_full.nil?
            msg 3, ">>> pixbuf_full #{path}"
            load_into_pixbuf_full
        end
        return @pixbuf_full
    end
    def free_pixbuf_full
        if @pixbuf_full.nil?
            return false
        else
            msg 3, ">>> free_pixbuf_full #{path}"
            @pixbuf_full = nil
            return true
        end
    end
    def pixbuf_main
        width, height = $mainview.window.size 
        width = MainView.get_usable_width(width)
        height = MainView.get_usable_height(height)
        if @pixbuf_main.nil? || width != @width || height != @height
            msg 3, ">>> pixbuf_main #{path}"
            @width = width
            @height = height
            load_into_pixbuf_full  #- make sure it is loaded
            if @pixbuf_full.nil?
                return
            end
            if @pixbuf_full.width.to_f / @pixbuf_full.height > width.to_f / height
                resized_height = @pixbuf_full.height * (width.to_f/@pixbuf_full.width)
                if @pixbuf_full.width > width || @pixbuf_full.height > resized_height
                    @pixbuf_main = @pixbuf_full.scale(width, resized_height, Gdk::Pixbuf::INTERP_BILINEAR)
                else
                    @pixbuf_main = @pixbuf_full
                end
            else
                resized_width = @pixbuf_full.width * (height.to_f/@pixbuf_full.height)
                if @pixbuf_full.width > resized_width || @pixbuf_full.height > height
                    @pixbuf_main = @pixbuf_full.scale(resized_width, height, Gdk::Pixbuf::INTERP_BILINEAR)
                else
                    @pixbuf_main = @pixbuf_full
                end
            end
        end
        return @pixbuf_main
    end
    def free_pixbuf_main
        if @pixbuf_main.nil?
            return false
        else
            msg 3, ">>> free_pixbuf_main #{path}"
            @pixbuf_main = nil
            return true
        end
    end
    def pixbuf_thumbnail
        if @pixbuf_thumbnail.nil?
            if @pixbuf_main
                msg 3, ">>> pixbuf_thumbnail from main #{path}"
                @pixbuf_thumbnail = @pixbuf_main.scale(@pixbuf_main.width * (@@thumbnails_height.to_f/@pixbuf_main.height), @@thumbnails_height, Gdk::Pixbuf::INTERP_BILINEAR)
            else
                msg 3, ">>> pixbuf_thumbnail from file #{path}"
                @pixbuf_thumbnail = load_into_pixbuf_at_size { |w, h|
                    if @angle == 0
                        if h > @@thumbnails_height
                            [ w * @@thumbnails_height.to_f/h, @@thumbnails_height ]
                        else
                            [ w, h ]
                        end
                    else
                        if w > @@thumbnails_height
                            [ @@thumbnails_height, h * @@thumbnails_height.to_f/w ]
                        else
                            [ w, h ]
                        end
                    end
                }
            end
        end
        return @pixbuf_thumbnail
    end
    def free_pixbuf_thumbnail
        if @pixbuf_thumbnail.nil?
            return false
        else
            msg 3, ">>> free_pixbuf_thumbnail #{path}"
            @pixbuf_thumbnail = nil
            return true
        end
    end

    def outline_color
        if removed
            return $color_red
        elsif labeled
            return labeled.color
        else
            return nil
        end
    end

    def show_bg
        if outline_color.nil?
            button.modify_bg(Gtk::StateType::NORMAL, nil)
            button.modify_bg(Gtk::StateType::PRELIGHT, nil)
            button.modify_bg(Gtk::StateType::ACTIVE, nil)
        else
            button.modify_bg(Gtk::StateType::NORMAL, outline_color)
            button.modify_bg(Gtk::StateType::PRELIGHT, outline_color.lighter)
            button.modify_bg(Gtk::StateType::ACTIVE, outline_color)
        end
    end

    def get_beautified_name
        if type == 'image'
            size = get_image_size(path)
            return _("%s (%sx%s, %s KB)") % [File.basename(@path).gsub(/\.[^.]+$/, ''),
                                             size[:x],
                                             size[:y],
                                             commify(file_size(path)/1024)]
        else
            return _("%s (video - %s KB)") % [File.basename(@path).gsub(/\.[^.]+$/, ''),
                                             commify(file_size(path)/1024)]
        end
    end

    private
    def cleanup_dir(dir)
        Dir.entries(dir).each { |file| file != '.' && file != '..' and File.delete(File.join(dir, file)) }
        Dir.delete(dir)
    end

    def load_into_pixbuf_full
        if @pixbuf_full.nil?
            msg 3, ">>> load_into_pixbuf_full #{path}"
            @pixbuf_full = load_into_pixbuf_at_size { |w, h|
                if @angle == 0
                    if w > @@max_width
                        #- save memory and speedup (+35%) loading 
                        [ w * (factor = @@max_width.to_f/w), h * factor ]
                    else
                        [ w, h ]
                    end
                else
                    if h > @@max_width
                        [ w * (factor = @@max_width.to_f/h), h * factor ]
                    else
                        [ w, h ]
                    end
                end
            }
        end
    end

    def load_into_pixbuf_at_size(&specify_size)
        pixbuf = nil
        if @type == 'video'
            tmp = Tempfile.new("boohclassifiertemp")
            tmp.close!
            Dir.mkdir(dest_dir = tmp.path)
            orig_base = File.basename(path)
            tmpdir = gen_video_thumbnail(path, false, 0)
            if tmpdir.nil?
                return
            end
            image_path = "#{tmpdir}/00000001.jpg"
        else
            image_path = @path
        end
        if @angle.nil?
            if @type == 'image'
                @angle = guess_rotate(image_path)
            else
                @angle = 0
            end
        end
        begin
            #- use a pixbuf loader and trigger Gtk.main_iteration on each chunk if needed, to keep the UI responsive even
            #- if loaded pictures are several MBs large
            loader = Gdk::PixbufLoader.new
            loader.signal_connect('size-prepared') { |l, w, h|
                r = specify_size.call(w, h)
                msg 3, "specified sizes: #{r[0]} #{r[1]}"
                loader.set_size(*specify_size.call(w, h))
            }
            loader.signal_connect('area-prepared') { pixbuf = loader.pixbuf }
            file = File.new(image_path)
            while (chunk = file.read(4096)) != nil
                loader.write(chunk)
                Gtk.main_iteration while Gtk.events_pending?
            end
            file.close
            loader.close
            if pixbuf.nil?
                raise "Loaded pixbuf nil - #{path} #{image_path}"
            end
        rescue Gdk::PixbufError
            msg 0, "Cannot load #{image_path}: #{$!}"
            return
        ensure
            if @type == 'video'
                File.delete(image_path)
                Dir.rmdir(tmpdir)
            end
        end
        if pixbuf
            if @angle != 0
                msg 3, ">>> load_into_pixbuf_full #{image_path} => rotate #{@angle}"
                pixbuf = rotate_pixbuf(pixbuf, @angle)
            end
        end
        if @type == 'video'
            cleanup_dir(dest_dir)
        end
        return pixbuf
    end

    def to_s
        @path
    end
end

$allentries = []

def run_preloader_real
    msg 3, "*** >> main preloading triggered..."
    if $preloader_running
        msg 3, "*** >>>>>> already running, return <<<<<<<<"
        return
    end
    $preloader_running = true
    if $mainview.get_shown_entry
        mem = get_mem
        if mem > $config['cache-memory-use-figure']
            msg 3, "too much RSS, stopping preloading, triggering GC"
            $preloader_running = false
            GC.start
            msg 3, "GC finished"
            return
        end
        index = $allentries.index($mainview.get_shown_entry)
        for j in 1 .. $config['preload-distance'].to_i
            i = index + j
            if i < $allentries.size
                $allentries[i].pixbuf_main
            end
            i = index - j
            if i >= 0
                $allentries[i].pixbuf_main
            end
        end
        check_memory_free_cache_if_needed
    end
    $preloader_running = false
    msg 3, "*** << main preloading finished"
    #- if we're already on a different image, rerun the preloader
    if index != $allentries.index($mainview.get_shown_entry)
        run_preloader_real
    end
end

def run_preloader
    if ! $preloader_allowed
        msg 3, "*** preloader not yet allowed"
        return
    end
    Gtk.timeout_add(10) {
        run_preloader_real
        false
    }
end

class MainView < Gtk::DrawingArea

    @@borders_thickness = 5
    @@borders_length = 25

    def MainView.borders_thickness
        return @@borders_thickness
    end

    def MainView.get_usable_width(available_width)
        return available_width - ($videoborder_pixbuf.width + @@borders_thickness) * 2
    end

    def MainView.get_usable_height(available_height)
        return available_height - @@borders_thickness * 2
    end
    
    def initialize
        super()
        signal_connect('expose-event') { draw }
        signal_connect('configure-event') { update_shown }
        @preloader_running = false
    end

    def set_shown_entry(entry)
        t1 = Time.now
        if ! entry.nil? && entry == @entry
            return
        end
        if ! entry.nil?
            if ! entry.button
                #- not loaded yet
                return
            else
                entry.button.grab_focus
            end
        end
        @entry = entry
        redraw        
        run_preloader
        msg 3, "entry shown in: #{Time.now - t1} s"
    end

    def get_shown_entry
        return @entry
    end

    def show_next_entry(entry)
        index = $allentries.index(entry) + 1
        if index < $allentries.size
            set_shown_entry($allentries[index])
        end
    end

    def redraw
        update_shown
        w, h = window.size
        window.begin_paint(Gdk::Rectangle.new(0, 0, w, h))
        window.clear
        draw
        window.end_paint
    end

    def update_shown
        if @entry
            @pixbuf = @entry.pixbuf_main
            width, height = window.size 
            @xpos = (width - @pixbuf.width)/2
            @ypos = (height - @pixbuf.height)/2
        else
            @pixbuf = nil
        end
    end

    def draw
        if @pixbuf
            window.draw_pixbuf(nil, @pixbuf, 0, 0, @xpos, @ypos, -1, -1, Gdk::RGB::DITHER_NONE, -1, -1)
            if @entry && @entry.type == 'video'
                window.draw_borders($videoborder_pixbuf, @xpos - $videoborder_pixbuf.width, @xpos + @pixbuf.width, @ypos, @ypos + @pixbuf.height)
            end
            if ! @entry.outline_color.nil?
                gc = Gdk::GC.new(window)
                colormap.alloc_color(@entry.outline_color, false, true)
                gc.set_foreground(@entry.outline_color)
                if @entry && @entry.type == 'video'
                    xleft = @xpos - $videoborder_pixbuf.width
                    xright = @xpos + @pixbuf.width + $videoborder_pixbuf.width
                else
                    xleft = @xpos
                    xright = @xpos + @pixbuf.width
                end
                window.draw_polygon(gc, true, [[xleft - @@borders_thickness, @ypos - @@borders_thickness],
                                               [xright + @@borders_thickness, @ypos - @@borders_thickness],
                                               [xright + @@borders_thickness, @ypos + @pixbuf.height + @@borders_thickness],
                                               [xleft - @@borders_thickness, @ypos + @pixbuf.height + @@borders_thickness],
                                               [xleft - @@borders_thickness, @ypos - 1],
                                               [xleft - 1, @ypos - 1],
                                               [xleft - 1, @ypos + @pixbuf.height + 1],
                                               [xright + 1, @ypos + @pixbuf.height + 1],
                                               [xright + 1, @ypos - 1],
                                               [xleft - @@borders_thickness, @ypos - 1]])
            end
        end
    end
end

def check_memory_free_cache_if_needed
    i = $allentries.index($mainview.get_shown_entry)
    return if i.nil?
    if get_mem < $config['cache-memory-use-figure'] * 2 / 3
        return
    end
    msg 3, "too much RSS, triggering GC"
    GC.start
    msg 3, "GC finished"
    ($allentries.size - 1).downto(1) { |j|
        if get_mem < $config['cache-memory-use-figure'] / 2
            break
        end
        index = i + j
        msg 3, "too much RSS, freeing full size of #{i+j} and #{i-j}..."
        if i + j < $allentries.size
            $allentries[i+j].free_pixbuf_full
        end
        if i - j > 0
            $allentries[i-j].free_pixbuf_full
        end
    }
end

def autoscroll_if_needed(button)
    xpos_left = button.allocation.x
    xpos_right = button.allocation.x + button.allocation.width
    hadj = $imagesline_sw.hadjustment
    current_minx_visible = hadj.value
    current_maxx_visible = hadj.value + hadj.page_size
    if xpos_left < current_minx_visible
        #- autoscroll left
        newval = hadj.value - (current_minx_visible - xpos_left)
        hadj.value = newval
        button.queue_draw  #- TOREMOVE: the visual focus is displayed incorrectly
    elsif xpos_right > current_maxx_visible
        #- autoscroll right
        newval = hadj.value + (xpos_right - current_maxx_visible)
        if newval > hadj.upper - hadj.page_size
            newval = hadj.upper - hadj.page_size
        end
        hadj.value = newval
        button.queue_draw  #- TOREMOVE: the visual focus is displayed incorrectly
    end
end

def show_popup(parent, msg, *options)
    dialog = Gtk::Dialog.new
    if options[0]
        options = options[0]
    else
        options = {}
    end
    if options[:title]
        dialog.title = options[:title]
    else
        dialog.title = utf8(_("Booh message"))
    end
    lbl = Gtk::Label.new
    if options[:nomarkup]
        lbl.text = msg
    else
        lbl.markup = msg
    end
    if options[:centered]
        lbl.set_justify(Gtk::Justification::CENTER)
    end
    if options[:selectable]
        lbl.selectable = true
    end
    if options[:topwidget]
        dialog.vbox.add(options[0][:topwidget])
    end
    if options[:scrolled]
        sw = Gtk::ScrolledWindow.new(nil, nil)
        sw.set_policy(Gtk::POLICY_AUTOMATIC, Gtk::POLICY_AUTOMATIC)
        sw.add_with_viewport(lbl)
        dialog.vbox.add(sw)
        dialog.set_default_size(500, 600)
    else
        dialog.vbox.add(lbl)
        dialog.set_default_size(200, 120)
    end
    if options[:bottomwidget]
        dialog.vbox.add(options[:bottomwidget])
    end
    if options[:okcancel]
        dialog.add_button(Gtk::Stock::CANCEL, Gtk::Dialog::RESPONSE_CANCEL)
    end
    dialog.add_button(Gtk::Stock::OK, Gtk::Dialog::RESPONSE_OK)

    if options[:pos_centered]
        dialog.window_position = Gtk::Window::POS_CENTER
    else
        dialog.window_position = Gtk::Window::POS_MOUSE
    end

    if options[:linkurl]
        linkbut = Gtk::Button.new('')
        linkbut.child.markup = "<span foreground=\"#00000000FFFF\" underline=\"single\">#{options[0][:linkurl]}</span>"
        linkbut.signal_connect('clicked') {
            open_url(options[0][:linkurl] + '/index.html')
            dialog.response(Gtk::Dialog::RESPONSE_OK)
            set_mousecursor_normal
        }
        linkbut.relief = Gtk::RELIEF_NONE
        linkbut.signal_connect('enter-notify-event') { set_mousecursor(Gdk::Cursor::HAND2, linkbut); false }
        linkbut.signal_connect('leave-notify-event') { set_mousecursor(nil, linkbut); false }
        dialog.vbox.add(Gtk::Alignment.new(0.5, 0.5, 0, 0).add(linkbut))
    end

    dialog.show_all

    if options[:stuff_connector]
        options[:stuff_connector].call({ :dialog => dialog })
    end
                                        
    if !options[:not_transient]
        dialog.transient_for = parent
        dialog.run { |response|
            if options[:data_getter]
                options[:data_getter].call
            end
            dialog.destroy
            if options[:okcancel]
                return response == Gtk::Dialog::RESPONSE_OK
            end
        }
    else
        dialog.signal_connect('response') { dialog.destroy }
    end
end

def video_view(entry)
    cmd = from_utf8($config['video-viewer']).gsub('%f', "'#{entry.path}'") + ' &'
    msg 2, cmd
    system(cmd)
end

def thumbnail_keypressed(entry, event)
    if event.state & Gdk::Window::MOD1_MASK != 0
        #- ALT pressed: Alt-Left and Alft-Right rotate
        if event.keyval == Gdk::Keyval::GDK_Left || event.keyval == Gdk::Keyval::GDK_Right
            if event.keyval == Gdk::Keyval::GDK_Left
                entry.angle = (entry.angle - 90) % 360
            else
                entry.angle = (entry.angle + 90) % 360
            end
            entry.free_pixbuf_full
            entry.free_pixbuf_main
            entry.free_pixbuf_thumbnail
            $mainview.redraw
            entry.image.pixbuf = entry.pixbuf_thumbnail
            if $config['rotate-set-exif'] == 'true' && entry.type == 'image'
                Exif.set_orientation(entry.path, angle_to_exif_orientation(entry.angle))
            end
        end

    elsif event.state & Gdk::Window::CONTROL_MASK != 0
        #- CONTROL pressed: Ctrl-z and Ctrl-r for undo/redo
        if event.keyval == Gdk::Keyval::GDK_z
            perform_undo
        end
        if event.keyval == Gdk::Keyval::GDK_r
            perform_redo
        end

    else
        removed_before = entry.removed
        label_before = entry.labeled

        if event.keyval == Gdk::Keyval::GDK_Delete
            entry.removed = true
            entry.labeled = nil
            entry.show_bg
            $mainview.show_next_entry(entry)
            update_visibility(entry)

            save_undo(_("set for removal"),
                      proc {
                          entry.removed = removed_before
                          entry.labeled = label_before
                          entry.show_bg
                          update_visibility(entry)
                          if entry.button.visible?
                              $mainview.set_shown_entry(entry)
                          end
                          proc {
                              entry.removed = true
                              entry.labeled = nil
                              entry.show_bg
                              update_visibility(entry)
                              if entry.button.visible?
                                  $mainview.set_shown_entry(entry)
                              end
                          }
                      })

        elsif event.keyval == Gdk::Keyval::GDK_space
            if entry.labeled
                msg = _("Cleared label")
            elsif entry.removed
                msg = _("Cleared set for removal")
            end
            entry.removed = false
            entry.labeled = nil
            entry.show_bg
            $mainview.show_next_entry(entry)

            save_undo(msg,
                      proc {
                          entry.removed = removed_before
                          entry.labeled = label_before
                          entry.show_bg
                          $mainview.set_shown_entry(entry)
                          proc {
                              entry.removed = false
                              entry.labeled = nil
                              entry.show_bg
                              $mainview.set_shown_entry(entry)
                          }
                      })

        elsif event.keyval == Gdk::Keyval::GDK_Return && entry.type == 'video'
            video_view(entry)

        else
            char = [ Gdk::Keyval.to_unicode(event.keyval) ].pack("C*")
            if char =~ /^[a-zA-z0-9]$/
                label = $labels[char]
                
                if label.nil?
                    vb = Gtk::VBox.new(false, 0)
                    vb.pack_start(entry = Gtk::Entry.new.set_text(char), false, false)
                    vb.pack_start(Gtk::Alignment.new(0.5, 0.5, 0, 0).add(bt = Gtk::ColorButton.new))
                    color = bt.color = Gdk::Color.new(16384 + rand(49151), 16384 + rand(49151), 16384 + rand(49151))
                    bt.signal_connect('color-set') { color = bt.color }
                    text = nil
                    entry.signal_connect('changed') {  #- cannot add a new label with first letter of an existing label
                        while $labels.has_key?(entry.text[0,1])
                            entry.text = entry.text.sub(/./, '')
                        end
                    }
                    if show_popup($main_window,
                                  utf8(_("You typed the text character '%s', which is not associated with a label.\nType in the full name of the label below to create a new one.")) % char,
                                  { :okcancel => true, :bottomwidget => vb, :data_getter => proc { text = entry.text },
                                    :stuff_connector => proc { |stuff| entry.select_region(0, 0)
                                                                       entry.position = -1
                                                                       entry.signal_connect('activate') { stuff[:dialog].response(Gtk::Dialog::RESPONSE_OK) } } } )
                        if text.length > 0
                            char = text[0,1]  #- in case it changed
                            label = Label.new(text)
                            label.color = color
                            $labels[char] = label
                            lbl = Gtk::Label.new.set_markup('<b>(' + char + ')</b>' + text[1..-1]).set_justify(Gtk::Justification::CENTER)
                            $labels_vbox.pack_start(label.button = Gtk::CheckButton.new.add(evt = Gtk::EventBox.new.add(lbl)).show_all)
                            label.button.active = true
                            label.button.signal_connect('toggled') { update_all_visibilities }
                            evt.modify_bg(Gtk::StateType::NORMAL, label.color)
                            evt.modify_bg(Gtk::StateType::PRELIGHT, label.color.lighter.lighter)
                            evt.modify_bg(Gtk::StateType::ACTIVE, label.color.lighter)
                        end
                    end

                else
                    entry.removed = false
                    entry.labeled = label
                    entry.show_bg
                    $mainview.show_next_entry(entry)
                    update_visibility(entry)

                    save_undo(_("set label"),
                              proc {
                                  entry.removed = removed_before
                                  entry.labeled = label_before
                                  entry.show_bg
                                  update_visibility(entry)
                                  if entry.button.visible?
                                      $mainview.set_shown_entry(entry)
                                  end
                                  proc {
                                      entry.removed = false
                                      entry.labeled = label
                                      entry.show_bg
                                      update_visibility(entry)
                                      if entry.button.visible?
                                          $mainview.set_shown_entry(entry)
                                      end
                                  }
                              })
                end
            end
        end
    end
end

def sb_msg(msg)
    $statusbar.pop(0)
    if msg
        $statusbar.push(0, utf8(msg))
    end
end

def show_entry(entry, i)
    #- scope entry
    msg 3, "showing entry #{entry}"
    entry.image = Gtk::Image.new(entry.pixbuf_thumbnail)
    if entry.type == 'video'
        entry.button = Gtk::Button.new.add(Gtk::HBox.new.pack_start(da1 = Gtk::DrawingArea.new.set_size_request($videoborder_pixbuf.width, -1), false, false).
                                           pack_start(entry.image).
                                           pack_start(da2 = Gtk::DrawingArea.new.set_size_request($videoborder_pixbuf.width, -1), false, false))
        da1.signal_connect('realize') { da1.window.set_back_pixmap($videoborder_pixmap, false) }
        da2.signal_connect('realize') { da2.window.set_back_pixmap($videoborder_pixmap, false) }
    else
        entry.button = Gtk::Button.new.set_image(entry.image)
    end
    Gtk::Tooltips.new.set_tip(entry.button, entry.get_beautified_name, nil)
    $imagesline.pack_start(entry.alignment = Gtk::Alignment.new(0.5, 1, 0, 0).add(entry.button).show_all, false, false)
    entry.button.signal_connect('clicked') {
        if (last_shown = $mainview.get_shown_entry) != entry
            entry.alignment.set(0.5, 0, 0, 0)
            last_shown and last_shown.alignment.set(0.5, 1, 0, 0)
            $mainview.set_shown_entry(entry)
            sb_msg(_("Selected %s") % entry.get_beautified_name)
        end
    }
    entry.button.signal_connect('button-press-event') { |w, event|
        if entry.type == 'video' && event.event_type == Gdk::Event::BUTTON2_PRESS
            video_view(entry)
        end
    }
    entry.button.signal_connect('focus-in-event') { entry.button.clicked; autoscroll_if_needed(entry.button) }
    entry.button.signal_connect('key-press-event') { |w, e| thumbnail_keypressed(entry, e) }
    if i == 0
        entry.button.grab_focus
    end
    update_visibility(entry)
    Gtk.main_iteration while Gtk.events_pending?
end

def show_entries
    sb_msg(_("Loading images..."))
    $loading_progressbar.fraction = 0
    $loading_progressbar.text = utf8(_("Loading... %d%") % 0)
    $loading_progressbar.show
    t1 = Time.now
    total_loaded_files = 0
    total_loaded_size = 0
    i = 0
    while i < $allentries.size
#        printf "%d %s\n", i, __LINE__
        entry = $allentries[i]
        if i == 0
            loaded_pixbuf = entry.pixbuf_main
        else
            loaded_pixbuf = entry.pixbuf_thumbnail
        end

        if loaded_pixbuf
            show_entry(entry, i)

            total_loaded_size += file_size(entry.path)
            if i % 4 == 0
                check_memory_free_cache_if_needed
            end
            total_loaded_files += 1
            i += 1
            if i > $config['preload-distance'].to_i && i <= $config['preload-distance'].to_i * 2
                #- when we're at preload distance, beging preloading to preload distance
                $allentries[i - $config['preload-distance'].to_i].pixbuf_main
            end
            if i == $config['preload-distance'].to_i * 2 + 1
                #- when we're after double preload distance, activate normal preloading
                $preloader_allowed = true
            end
            
        else
            $allentries.delete_at(i)
        end
        $loading_progressbar.fraction = i.to_f / $allentries.size
        $loading_progressbar.text = utf8(_("Loading... %d%") % (100 * $loading_progressbar.fraction))
    end
    if i <= $config['preload-distance'].to_i * 2
        #- not yet preloaded correctly
        $preloader_allowed = true
        run_preloader
    end
    sb_msg(_("%d images of total %s kB loaded in %3.2f seconds.") % [ total_loaded_files, commify(total_loaded_size / 1024), Time.now - t1 ])
    $loading_progressbar.hide
    $execute.sensitive = true
end

def reset_all
    reset_labels
    reset_thumbnails
    $mainview.set_shown_entry(nil)
    sb_msg(nil)
    $preloader_allowed = false
end

def open_dir(path)
    #- remove visual stuff, so that user will see something is happening
    reset_all
    sb_msg(_("Scanning source directory..."))
    Gtk.main_iteration while Gtk.events_pending?

    path = File.expand_path(path.sub(%r|/$|, ''))
    examined_dirs = `find '#{path}' -type d -follow`.sort.collect { |v| v.chomp }
    #- validate first
    examined_dirs.each { |dir|
        if dir =~ /'/
            return utf8(_("Source directory or sub-directories can't contain a single-quote character, sorry: %s") % dir)
        end
        Dir.entries(dir).each { |file|
            if file =~ /'/ && type = entry2type(file) && type == 'video'
                return utf8(_("Videos can't contain a single quote character ('), sorry: %s") % "#{dir}/#{file}")
            end
        }
    }

    #- scan for populate second
    examined_dirs.each { |dir|
        if File.basename(dir) =~ /^\./
            msg 1, _("Ignoring directory %s, begins with a dot (indicating a hidden directory)") % dir
            next
        end
        entries = Dir.entries(dir)
        if $sort_by_exif_date
            dates = {}
            entries.each { |file|
                date_time = Exif.datetimeoriginal(File.join(dir, file))
                if ! date_time.nil?
                    dates[file] = date_time
                end
            }
            entries = smartsort(entries, dates)
        else
            entries.sort!
        end
        entries.each { |file|
            type = entry2type(file)
            if type
                $allentries << Entry.new(File.join(dir, file), type)
            end
        }
    }
    $workingdir = path
    return nil
end

def open_dir_popup
    fc = Gtk::FileChooserDialog.new(utf8(_("Specify the directory to work with")),
                                    nil,
                                    Gtk::FileChooser::ACTION_SELECT_FOLDER,
                                    nil,
                                    [Gtk::Stock::OPEN, Gtk::Dialog::RESPONSE_ACCEPT], [Gtk::Stock::CANCEL, Gtk::Dialog::RESPONSE_CANCEL])
    fc.transient_for = $main_window
    if $workingdir
        fc.current_folder = $workingdir
    end
    ok = false
    load = false
    while !ok
        if fc.run == Gtk::Dialog::RESPONSE_ACCEPT
            msg = open_dir(fc.filename)
            if msg
                show_popup(fc, msg)
                ok = false
            else
                ok = true
                load = true
            end
        else
            ok = true
        end
    end
    fc.destroy
    if load
        show_entries
    end
end

def try_quit(*options)
    Gtk.main_quit
end

def execute
    dialog = Gtk::Dialog.new
    dialog.title = utf8(_("Booh message"))

    vb1 = Gtk::VBox.new(false, 5)
    label = Gtk::Label.new.set_markup(utf8(_("You're about to <b>execute</b> actions on the marked images.\nPlease confirm below the actions. This operation is not undoable!")))
    vb1.pack_start(label, false, false)

    table = Gtk::Table.new(0, 0, false)
    table.set_row_spacings(5)
    table.set_column_spacings(5)
    table.attach(Gtk::Label.new.set_markup(utf8(_("<b>Label name:</b>"))).set_justify(Gtk::Justification::CENTER), 0, 1, 0, 1, Gtk::FILL, Gtk::FILL, 5, 0)
    table.attach(Gtk::Label.new.set_markup(utf8(_("<b>Amount of pictures:</b>"))).set_justify(Gtk::Justification::CENTER), 1, 2, 0, 1, Gtk::FILL, Gtk::FILL, 5, 0)
    table.attach(Gtk::Label.new.set_markup(utf8(_("<b>Pictures examples:</b>"))).set_justify(Gtk::Justification::CENTER), 2, 3, 0, 1, Gtk::FILL, Gtk::FILL, 5, 0)
    table.attach(Gtk::Label.new.set_markup(utf8(_("<b>Action to perform:</b>"))).set_justify(Gtk::Justification::CENTER), 3, 4, 0, 1, Gtk::FILL, Gtk::FILL, 5, 0)
    add_row = proc { |row, name, color, truthproc, normal|
        table.attach(Gtk::Alignment.new(0, 0.5, 1, 0).add(Gtk::EventBox.new.add(Gtk::Label.new.set_markup(name)).modify_bg(Gtk::StateType::NORMAL, color)),
                     0, 1, row, row + 1, Gtk::FILL, Gtk::FILL, 5, 5)
        counter = 0
        examples = Gtk::HBox.new(false, 5)
        $allentries.each { |entry|
            if truthproc.call(entry)
                counter += 1
                if counter < 4
                    thumbnail = Gtk::Image.new(entry.pixbuf_thumbnail)
                    if entry.type == 'video'
                        thumbnail = Gtk::HBox.new.pack_start(da1 = Gtk::DrawingArea.new.set_size_request($videoborder_pixbuf.width, -1), false, false).
                                                  pack_start(thumbnail).
                                                  pack_start(da2 = Gtk::DrawingArea.new.set_size_request($videoborder_pixbuf.width, -1), false, false)
                        da1.signal_connect('realize') { da1.window.set_back_pixmap($videoborder_pixmap, false) }
                        da2.signal_connect('realize') { da2.window.set_back_pixmap($videoborder_pixmap, false) }
                    end
                    examples.pack_start(thumbnail, false, false)
                elsif counter == 4
                    examples.pack_start(Gtk::Label.new.set_markup("<b>...</b>"), false, false)
                end
            end
        }
        table.attach(Gtk::Label.new(counter.to_s).set_justify(Gtk::Justification::CENTER), 1, 2, row, row + 1, 0, 0, 5, 5)
        table.attach(examples, 2, 3, row, row + 1, Gtk::FILL, Gtk::FILL, 5, 5)

        combostore = Gtk::ListStore.new(Gdk::Pixbuf, String)
        iter = combostore.append
        if normal
            iter[0] = $main_window.render_icon(Gtk::Stock::GO_FORWARD, Gtk::IconSize::MENU)
            iter[1] = utf8(_("Move to:"))
            iter = combostore.append
            iter[0] = $main_window.render_icon(Gtk::Stock::PASTE, Gtk::IconSize::MENU)
            iter[1] = utf8(_("Copy to:"))
        else
            iter[0] = $main_window.render_icon(Gtk::Stock::DELETE, Gtk::IconSize::MENU)
            iter[1] = utf8(_("Permanently remove"))
        end
        iter = combostore.append
        iter[0] = $main_window.render_icon(Gtk::Stock::MEDIA_STOP, Gtk::IconSize::MENU)
        iter[1] = utf8(_("Do nothing"))
        combo = Gtk::ComboBox.new(combostore)
        combo.active = 0
        renderer = Gtk::CellRendererPixbuf.new
        combo.pack_start(renderer, false)
        combo.set_attributes(renderer, :pixbuf => 0)
        renderer = Gtk::CellRendererText.new
        combo.pack_start(renderer, true)
        combo.set_attributes(renderer, :text => 1)

        if normal
            pathbutton = Gtk::Button.new.add(pathlabel = Gtk::Label.new.set_markup(utf8(_("<i>(unset)</i>"))))
            lastpath = $workingdir
            pathbutton.signal_connect('clicked') {
                fc = Gtk::FileChooserDialog.new(utf8(_("Specify the directory where to move the pictures to")),
                                                nil,
                                                Gtk::FileChooser::ACTION_SELECT_FOLDER,
                                                nil,
                                                [Gtk::Stock::OPEN, Gtk::Dialog::RESPONSE_ACCEPT], [Gtk::Stock::CANCEL, Gtk::Dialog::RESPONSE_CANCEL])
                fc.transient_for = dialog
                fc.current_folder = lastpath
                if fc.run == Gtk::Dialog::RESPONSE_ACCEPT
                    pathlabel.text = fc.filename
                end
                lastpath = fc.filename
                fc.destroy
            }
            combo.signal_connect('changed') {
                pathbutton.sensitive = combo.active <= 1
            }
            vb = Gtk::VBox.new(false, 5)
            vb.pack_start(combo, false, false)
            vb.pack_start(pathbutton, false, false)
            table.attach(Gtk::Alignment.new(0, 0.5, 1, 0).add(vb), 3, 4, row, row + 1, Gtk::FILL, Gtk::FILL, 5, 5)
            { :combo => combo, :pathlabel => pathlabel }
        else
            table.attach(Gtk::Alignment.new(0, 0.5, 1, 0).add(combo), 3, 4, row, row + 1, Gtk::FILL, Gtk::FILL, 5, 5)
            { :combo => combo }
        end
    }
    stuff = {}
    stuff['toremove'] = add_row.call(1, utf8(_("<i>to remove</i>")), $color_red, proc { |entry| entry.removed }, false)
    $labels.values.each_with_index { |label, row| stuff[label] = add_row.call(row + 2, label.name, label.color, proc { |entry| entry.labeled == label }, true) }
    vb1.pack_start(sw = Gtk::ScrolledWindow.new(nil, nil).add_with_viewport(table).set_policy(Gtk::POLICY_AUTOMATIC, Gtk::POLICY_AUTOMATIC), true, true)

    toremove_amount = $allentries.find_all { |entry| entry.removed }.size
    toremove_size = commify($allentries.find_all { |entry| entry.removed }.collect { |entry| file_size(entry.path) }.sum / 1024)
    check_removal = Gtk::CheckButton.new(utf8(_("I have noticed I am about to permanently remove the %d above mentioned pictures (total %s kB).") % [ toremove_amount, toremove_size ]))
    if toremove_amount > 0
        vb1.pack_start(check_removal, false, false)
        stuff['toremove'][:combo].signal_connect('changed') { |widget|
            check_removal.sensitive = widget.active == 0
        }
    end

    dialog.vbox.add(vb1)

    dialog.set_default_size(800, 600)
    dialog.add_button(Gtk::Stock::CANCEL, Gtk::Dialog::RESPONSE_CANCEL)
    dialog.add_button(Gtk::Stock::OK, Gtk::Dialog::RESPONSE_OK)
    dialog.window_position = Gtk::Window::POS_MOUSE
    dialog.transient_for = $main_window

    dialog.show_all

    while true
        dialog.run { |response|        
            if response == Gtk::Dialog::RESPONSE_OK
                if toremove_amount > 0 && ! check_removal.active? && stuff['toremove'][:combo].active == 0
                    show_popup(dialog, utf8(_("You have not confirmed that you noticed the permanent removal of the pictures marked for deletion.")))
                    break
                end
                problem = false
                label2entries = {}
                $labels.values.each { |label| label2entries[label] = [] }
                $allentries.each { |entry| entry.labeled and label2entries[entry.labeled] << entry }
                stuff.keys.each { |key|
                    if key.is_a?(Label) && stuff[key][:combo].active <= 1
                        destination = stuff[key][:pathlabel].text
                        if destination[0] != ?/
                            show_popup(dialog, utf8(_("You have not selected a directory where to move/copy %s.") % key.name))
                            problem = true
                            break
                        end
                        begin
                            Dir.mkdir(destination)
                        rescue Errno::EEXIST
                        end
                        begin
                            st = File.stat(destination)
                        rescue
                            show_popup(dialog, utf8(_("Directory %s, where to move/copy %s, is not valid or not createable.") % [destination, key.name]))
                            problem = true
                            break
                        end
                        if ! st.directory? || ! st.writable?
                            show_popup(dialog, utf8(_("Directory %s, where to move/copy %s, is not valid or not writable.") % [destination, key.name]))
                            problem = true
                            break
                        end
                        label2entries[key].each { |entry|
                            begin
                                File.stat(File.join(destination, File.basename(entry.path)))
                                show_popup(dialog, utf8(_("Sorry, a file '%s' already exists in directory '%s'.") % [ File.basename(entry.path), destination ]))
                                problem = true
                                break
                            rescue
                            end
                        }
                        if problem
                            break
                        end
                    end
                }
                if ! problem
                    begin
                        moved = 0
                        copied = 0
                        stuff.keys.each { |key|
                            if key.is_a?(Label) && stuff[key][:combo].active <= 1
                                destination = stuff[key][:pathlabel].text
                                label2entries[key].each { |entry|
                                    if stuff[key][:combo].active == 0
                                        File.rename(entry.path, File.join(destination, File.basename(entry.path)))
                                        moved += 1
                                    elsif stuff[key][:combo].active == 1
                                        system("cp -dp '#{entry.path}' '#{destination}'")
                                        copied += 1
                                    end
                                }
                            end
                        }
                        removed = 0
                        if stuff['toremove'][:combo].active == 0
                            $allentries.each { |entry|
                                if entry.removed
                                    File.delete(entry.path)
                                    removed += 1
                                end
                            }
                        end
                    rescue
                        msg 1, "woops: #{$!}"
                        show_popup(dialog, utf8(_("Unexpected system call error: '%s'.") % $!))
                    end
                    show_popup(dialog, utf8(_("Successfully moved %d files, copied %d file, and removed %d files.") % [ moved, copied, removed ]))
                    dialog.destroy
                    reset_all
                    return
                end

            else
                dialog.destroy
                return
            end
        }
    end
end

def update_visibility(entry)
    if ! entry.button
        #- not yet loaded
        return
    end
    if entry.labeled
        if entry.labeled.button.active?
            entry.button.show
        else
            entry.button.hide
        end
    elsif entry.removed
        if $toremove_button.active?
            entry.button.show
        else
            entry.button.hide
        end
    else
        if $unlabelled_button.active?
            entry.button.show
        else
            entry.button.hide
        end
    end
end
        
def update_all_visibilities
    $allentries.each { |entry|
        update_visibility(entry)
    }
    shown = $mainview.get_shown_entry
    if shown.nil?
        return
    end
    while shown.button && ! shown.button.visible? && shown != $allentries.last
        shown = $allentries[$allentries.index(shown) + 1]
    end 
    if shown.button && shown.button.visible?
        shown.button.grab_focus
        return
    end
    $allentries.reverse.each { |entry|
        if entry.button && entry.button.visible?
            entry.button.grab_focus
            return
        end
    }
end

def preferences
    dialog = Gtk::Dialog.new(utf8(_("Edit preferences")),
                             $main_window,
                             Gtk::Dialog::MODAL | Gtk::Dialog::DESTROY_WITH_PARENT,
                             [Gtk::Stock::OK, Gtk::Dialog::RESPONSE_OK],
                             [Gtk::Stock::CANCEL, Gtk::Dialog::RESPONSE_CANCEL])

    tooltips = Gtk::Tooltips.new
    
    dialog.vbox.add(tbl = Gtk::Table.new(0, 0, false))
    tbl.attach(Gtk::Alignment.new(1, 0.5, 0, 0).add(Gtk::Label.new.set_markup(utf8(_("Command for watching videos: ")))),
               0, 1, 0, 1, Gtk::FILL, Gtk::SHRINK, 2, 2)
    tbl.attach(Gtk::Alignment.new(0, 0.5, 1, 0).add(video_viewer_entry = Gtk::Entry.new.set_text($config['video-viewer']).set_size_request(250, -1)),
               1, 2, 0, 1, Gtk::FILL, Gtk::SHRINK, 2, 2)
    tooltips.set_tip(video_viewer_entry, utf8(_("Use %f to specify the filename;\nfor example: /usr/bin/mplayer %f")), nil)

    tbl.attach(Gtk::Alignment.new(1, 0.5, 0, 0).add(Gtk::Label.new.set_markup(utf8(_("Browser's command: ")))),
               0, 1, 1, 2, Gtk::FILL, Gtk::SHRINK, 2, 2)
    tbl.attach(Gtk::Alignment.new(0, 0.5, 1, 0).add(browser_entry = Gtk::Entry.new.set_text($config['browser'])),
               1, 2, 1, 2, Gtk::FILL, Gtk::SHRINK, 2, 2)
    tooltips.set_tip(browser_entry, utf8(_("Use %f to specify the filename;\nfor example: /usr/bin/mozilla-firefox -remote 'openURL(%f,new-window)' || /usr/bin/mozilla-firefox %f")), nil)

    tbl.attach(Gtk::Alignment.new(1, 0.5, 0, 0).add(Gtk::Label.new.set_markup(utf8(_("Preloading distance: ")))),
               0, 1, 2, 3, Gtk::FILL, Gtk::SHRINK, 2, 2)
    tbl.attach(Gtk::Alignment.new(0, 0.5, 1, 0).add(preload_distance = Gtk::SpinButton.new(0, 50, 1).set_value($config['preload-distance'].to_i)),
               1, 2, 2, 3, Gtk::FILL, Gtk::SHRINK, 2, 2)
    tooltips.set_tip(preload_distance, utf8(_("Amount of pictures preloaded left and right to the currently shown")), nil)

    tbl.attach(Gtk::Alignment.new(1, 0.5, 0, 0).add(Gtk::Label.new.set_markup(utf8(_("Cache memory use: ")))),
               0, 1, 3, 4, Gtk::FILL, Gtk::SHRINK, 2, 2)
    tbl.attach(Gtk::Alignment.new(0, 0.5, 1, 0).add(cache_vbox = Gtk::VBox.new(false, 0)),
               1, 2, 3, 4, Gtk::FILL, Gtk::SHRINK, 2, 2)
    cache_vbox.pack_start(Gtk::HBox.new(false, 0).pack_start(cache_memfree_radio = Gtk::RadioButton.new(''), false, false).
                                                  pack_start(cache_memfree_spin = Gtk::SpinButton.new(0, 100, 10), false, false).
                                                  pack_start(cache_memfree_label = Gtk::Label.new(utf8(_("% of free memory"))), false, false), false, false)
    cache_memfree_spin.signal_connect('value-changed') { cache_memfree_radio.active = true }
    tooltips.set_tip(cache_memfree_spin, utf8(_("Percentage of free memory (+ buffers/cache) measured at startup")), nil)
    cache_vbox.pack_start(Gtk::HBox.new(false, 0).pack_start(cache_specify_radio = Gtk::RadioButton.new(cache_memfree_radio, ''), false, false).
                                                  pack_start(cache_specify_spin = Gtk::SpinButton.new(0, 4000, 50), false, false).
                                                  pack_start(cache_specify_label = Gtk::Label.new(utf8(_("MB"))).set_sensitive(false), false, false), false, false)
    cache_specify_spin.signal_connect('value-changed') { cache_specify_radio.active = true }
    cache_memfree_radio.signal_connect('toggled') {
        if cache_memfree_radio.active?
            cache_memfree_label.sensitive = true
            cache_specify_label.sensitive = false
        else
            cache_specify_label.sensitive = true
            cache_memfree_label.sensitive = false
        end
    }
    tooltips.set_tip(cache_specify_spin, utf8(_("Amount of memory in megabytes")), nil)
    if $config['cache-memory-use'] =~ /memfree_(\d+)/
        cache_memfree_spin.value = $1.to_i
    else
        cache_specify_spin.value = $config['cache-memory-use'].to_i
    end

    tbl.attach(update_exif_orientation_check = Gtk::CheckButton.new(utf8(_("Update file's EXIF orientation when rotating a picture"))),
               0, 2, 4, 5, Gtk::FILL, Gtk::SHRINK, 2, 2)
    tooltips.set_tip(update_exif_orientation_check, utf8(_("When rotating a picture (Alt-Right/Left), also update EXIF orientation in the file itself")), nil)
    update_exif_orientation_check.active = $config['rotate-set-exif'] == 'true'

    dialog.vbox.show_all
    dialog.run { |response|
        if response == Gtk::Dialog::RESPONSE_OK
            $config['video-viewer'] = from_utf8(video_viewer_entry.text)
            $config['browser'] = from_utf8(browser_entry.text)
            $config['preload-distance'] = preload_distance.value
            $config['rotate-set-exif'] = update_exif_orientation_check.active?.to_s
            if cache_memfree_radio.active?
                $config['cache-memory-use'] = "memfree_#{cache_memfree_spin.value}%"
            else
                $config['cache-memory-use'] = cache_specify_spin.value
            end
            set_cache_memory_use_figure
        end
    }
    dialog.destroy
end

def perform_undo
    if $undo_mb.sensitive?
        $redo_mb.sensitive = true
        if not more_undoes = UndoHandler.undo($statusbar)
            $undo_mb.sensitive = false
        end
    end
end

def perform_redo
    if $redo_mb.sensitive?
        $undo_mb.sensitive = true
        if not more_redoes = UndoHandler.redo($statusbar)
            $redo_mb.sensitive = false
        end
    end
end

def create_menubar    
    #- menu
    mb = Gtk::MenuBar.new

    filemenu = Gtk::MenuItem.new(utf8(_("_File")))
    filesubmenu = Gtk::Menu.new
    filesubmenu.append(open      = Gtk::ImageMenuItem.new(Gtk::Stock::OPEN))
    filesubmenu.append(            Gtk::SeparatorMenuItem.new)
    filesubmenu.append($execute  = Gtk::ImageMenuItem.new(Gtk::Stock::EXECUTE).set_sensitive(false))
    filesubmenu.append(            Gtk::SeparatorMenuItem.new)
    filesubmenu.append(quit      = Gtk::ImageMenuItem.new(Gtk::Stock::QUIT))
    filemenu.set_submenu(filesubmenu)
    mb.append(filemenu)

    open.signal_connect('activate') { open_dir_popup }
    $execute.signal_connect('activate') { execute }
    quit.signal_connect('activate') { try_quit }

    editmenu = Gtk::MenuItem.new(utf8(_("_Edit")))
    editsubmenu = Gtk::Menu.new
    editsubmenu.append($undo_mb    = Gtk::ImageMenuItem.new(Gtk::Stock::UNDO).set_sensitive(false))
    editsubmenu.append($redo_mb    = Gtk::ImageMenuItem.new(Gtk::Stock::REDO).set_sensitive(false))
    editsubmenu.append(              Gtk::SeparatorMenuItem.new)
    editsubmenu.append(prefs       = Gtk::ImageMenuItem.new(Gtk::Stock::PREFERENCES))
    editmenu.set_submenu(editsubmenu)
    mb.append(editmenu)

    $undo_mb.signal_connect('activate') { perform_undo }
    $redo_mb.signal_connect('activate') { perform_redo }
    prefs.signal_connect('activate') { preferences }
    
    helpmenu = Gtk::MenuItem.new(utf8(_("_Help")))
    helpsubmenu = Gtk::Menu.new
    helpsubmenu.append(tutos = Gtk::ImageMenuItem.new(utf8(_("Online tutorials (opens a web-browser)"))))
    tutos.image = Gtk::Image.new("#{$FPATH}/images/stock-web-16.png")
    helpsubmenu.append(Gtk::SeparatorMenuItem.new)
    helpsubmenu.append(about = Gtk::ImageMenuItem.new(Gtk::Stock::ABOUT))
    helpmenu.set_submenu(helpsubmenu)
    mb.append(helpmenu)

    tutos.signal_connect('activate') { open_url('http://booh.org/tutorial.html') }
    about.signal_connect('activate') { call_about }


    #- no toolbar, to save height

    return mb
end

def reset_labels
    for child in $labels_vbox.children
        $labels_vbox.remove(child)
    end
    $labels_vbox.pack_start(Gtk::Label.new(utf8(_("Labels list:"))).set_justify(Gtk::Justification::CENTER), false, false).show_all
    $labels = {}
    lbl = Gtk::Label.new.set_markup(utf8(_("<i>unlabelled</i>")))
    $labels_vbox.pack_start($unlabelled_button = Gtk::CheckButton.new.add(Gtk::EventBox.new.add(lbl)).show_all)
    $unlabelled_button.active = true
    $unlabelled_button.signal_connect('toggled') { update_all_visibilities }
    lbl = Gtk::Label.new.set_markup(utf8(_("<i>to remove</i>")))
    $labels_vbox.pack_start($toremove_button = Gtk::CheckButton.new.add(evt = Gtk::EventBox.new.add(lbl)).show_all)
    $toremove_button.active = true
    $toremove_button.signal_connect('toggled') { update_all_visibilities }
    evt.modify_bg(Gtk::StateType::NORMAL, $color_red)
    evt.modify_bg(Gtk::StateType::PRELIGHT, $color_red.lighter.lighter)
    evt.modify_bg(Gtk::StateType::ACTIVE, $color_red.lighter)
end

def reset_thumbnails
    $allentries = []
    for child in $imagesline.children
        $imagesline.remove(child)
    end
end

def create_main_window

    $videoborder_pixbuf = Gdk::Pixbuf.new("#{$FPATH}/images/video_border.png")
    $videoborder_pixmap, = $videoborder_pixbuf.render_pixmap_and_mask(0)

    mb = create_menubar

    main_vbox = Gtk::VBox.new(false, 0)
    main_vbox.pack_start(mb, false, false)
    mainview_hbox = Gtk::HBox.new
    mainview_hbox.pack_start(Gtk::Alignment.new(0.5, 0, 1, 1).add(left_vbox = Gtk::VBox.new(false, 5)), false, true)
    left_vbox.pack_start(($labels_vbox = Gtk::VBox.new(false, 5)), false, true)
    $labels_vbox.pack_start(Gtk::Label.new(utf8(_("Labels list:"))).set_justify(Gtk::Justification::CENTER), false, false).show_all
    left_vbox.pack_end($loading_progressbar = Gtk::ProgressBar.new.set_text(utf8(_("Loading... %d%") % 0)), false, true)
    reset_labels
    mainview_hbox.pack_start($mainview = MainView.new, true, true)
    main_vbox.pack_start(mainview_hbox, true, true)
    $imagesline_sw = Gtk::ScrolledWindow.new(nil, nil)
    $imagesline_sw.set_policy(Gtk::POLICY_ALWAYS, Gtk::POLICY_NEVER)
    $imagesline_sw.add_with_viewport($imagesline = Gtk::HBox.new(false, 0).show)
    main_vbox.pack_start($imagesline_sw, false, false)
    main_vbox.pack_end($statusbar = Gtk::Statusbar.new, false, false)

    $imagesline.set_size_request(-1, Gtk::Button.new.size_request[1] + Entry.thumbnails_height + 15)

    $main_window = Gtk::Window.new
    $main_window.add(main_vbox)
    $main_window.signal_connect('delete-event') {
        try_quit({ :disallow_cancel => true })
    }

    #- read/save size and position of window
    if $config['pos-x'] && $config['pos-y']
        $main_window.move($config['pos-x'].to_i, $config['pos-y'].to_i)
    else
        $main_window.window_position = Gtk::Window::POS_CENTER
    end
    msg 3, "size: #{$config['width']}x#{$config['height']}"
    $main_window.set_default_size(($config['width'] || 700).to_i, ($config['height'] || 600).to_i)
    $main_window.signal_connect('configure-event') {
        msg 3, "configure: pos: #{$main_window.window.root_origin.inspect} size: #{$main_window.window.size.inspect}"
        x, y = $main_window.window.root_origin
        width, height = $main_window.window.size
        $config['pos-x'] = x
        $config['pos-y'] = y
        $config['width'] = width
        $config['height'] = height
        false
    }

    $main_window.show_all
    $loading_progressbar.hide
end


handle_options
read_config
Gtk.init


create_main_window
check_config

if ARGV[0]
    if msg = open_dir(ARGV[0])
        puts msg
    else
        show_entries
    end
end
Gtk.main

write_config