Class: Dog::Viewer

Inherits:
Object
  • Object
show all
Defined in:
lib/dog/viewer.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Viewer

Returns a new instance of Viewer.



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# File 'lib/dog/viewer.rb', line 13

def initialize
  @map = Dog::Map.new

  @first_time = @map.load
  initialize_handlers

  @topic   = Window.new(1,cols,0,0)

  colwidth = (cols/2).ceil + 1
  @left    = Window.new(lines/3, colwidth, 1, 0)
  @right   = Window.new(lines/3, colwidth, 1, cols-colwidth)

  @link    = Window.new(1,cols,lines/3+1,0)
  @preview = Window.new(lines - lines/3 - 3,cols,lines/3+2,0)
  @status  = Window.new(1,cols,lines-1,0)
end

Instance Method Details



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# File 'lib/dog/viewer.rb', line 138

def active_link
  wrap_cursor
  if @max_items == 0
    return nil
  end

  if @active_window == @left
    @incoming[@active_item]["path"]
  else
    @map.path(index: @active_item)
  end
end

#add_menu_item(window, position, text) ⇒ Object 



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# File 'lib/dog/viewer.rb', line 118

def add_menu_item( window, position, text )
  window.setpos(position, 2)
  window.attrset( window == @active_window && @active_item == position ? A_STANDOUT : A_NORMAL )
  window.addstr( text )
  window.attrset( A_NORMAL )
end

#centerx(text = "") ⇒ Object 



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# File 'lib/dog/viewer.rb', line 114

def centerx( text = "" )
  cols/2 - (text&.length || 0)/2
end

#clear_window(window) ⇒ Object 



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# File 'lib/dog/viewer.rb', line 84

def clear_window( window )
  window.clear
  if [@topic, @link, @status].include? window
    window.box(' ', nil, ' ')
  elsif [@left, @right].include? window
    window.box(nil, ' ')
  end
end

#get_handler(filename) ⇒ Object 



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# File 'lib/dog/viewer.rb', line 228

def get_handler( filename )
  @link_handlers.each do |regex, value|
    if filename =~ Regexp.new(regex)
      return value
    end
  end
  return nil
end

#initialize_handlers ⇒ Object 



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# File 'lib/dog/viewer.rb', line 30

def initialize_handlers
  if !load_handlers
    @link_handlers = {
      ".txt$" => {
        "preview" => "cat %%",
        "open" => "${EDITOR:-vim} %%"
      },
      "/$" => {
        "preview" => "ls -lah %%",
        "open" => "${EDITOR:-vim} %%"
      },
      "^http" => {
        "preview" => "echo \"WIP!\"",
        "open" => "lynx %%"
        # "preview" => ->(x) {
        #   md5 = Digest::MD5.hexdigest(x)
        #   uri = URI(x)

        #   if !Dir.exist?("#{Dir.home}/.dog/cache/#{md5}")
        #     @preview.setpos(0,0)
        #     @preview.addstr("caching html and loading preview...")
        #     @preview.refresh

        #     FileUtils.mkdir_p "#{Dir.home}/.dog/cache/#{md5}"
        #     `wget -P #{Dir.home}/.dog/cache/#{md5} -p -q -k #{x} -U "Mozilla/5.0 (X11; Fedora; Linux x86_64; rv:52.0) Gecko/20100101 Firefox/52.0"`
        #   end

        #   @preview.setpos(0,0)
        #   @preview.addstr(`lynx #{Dir.home}/.dog/cache/#{md5}/#{uri.host}/#{uri.path} -dump -force_html`)
        # },
        # "open" => ->(x) {
        #   md5 = Digest::MD5.hexdigest(x)
        #   uri = URI(x)
        #   system( "open -a /Applications/Firefox.app #{Dir.home}/.dog/cache/#{md5}/#{uri.host}/#{uri.path}" )
        # }
      }
    }
  end
end

#load_handlers ⇒ Object 



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# File 'lib/dog/viewer.rb', line 70

def load_handlers
  begin
    data = YAML.load_file(HANDLERS_FILENAME)
    @link_handlers = data if data
  rescue Errno::ENOENT, Errno::ENOTDIR
    return false
  end
  return true
end

#menu_loop ⇒ Object 



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# File 'lib/dog/viewer.rb', line 294

def menu_loop
  show(@status, "tab - next field | enter - commit | esc - cancel")
  curs_set(1)
  while fch = @preview.getch
    begin
      case fch
      when KEY_RESIZE
        resize
      when 9
        @form.driver(REQ_NEXT_FIELD)
      when KEY_DOWN
        @form.driver(REQ_NEXT_FIELD)
      when 353
        @form.driver(REQ_PREV_FIELD)
      when KEY_UP
        @form.driver(REQ_PREV_FIELD)
      when 10
        @form.driver(REQ_VALIDATION)
        @form.unpost

        if @editing
          @map.replace(
            name: @map.name(index: @active_item),
            new_name: @name_field.buffer(0).strip,
            new_path: @link_field.buffer(0).strip
          )
        else
          @map.add(
            name: @name_field.buffer(0).strip,
            path: @link_field.buffer(0).strip
          )
        end
        refresh_display
        show(@status, "done")
        break
      when 127
        @form.driver(REQ_DEL_PREV)
      when KEY_LEFT
        @form.driver(REQ_PREV_CHAR)
      when KEY_RIGHT
        @form.driver(REQ_NEXT_CHAR)
      when 27
        @form.unpost
        refresh_display
        show(@status, "cancelled")
        break
      else
        fch.to_s.each_char do |letter|
          @form.driver(letter)
        end
      end
    rescue Curses::RequestDeniedError
    end
  end
  curs_set(0)
end

#move_cursor(dir) ⇒ Object 



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# File 'lib/dog/viewer.rb', line 155

def move_cursor( dir )
  @active_item += dir

  wrap_cursor

  preview_active_file
end

#navigate(destination) ⇒ Object 



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# File 'lib/dog/viewer.rb', line 189

def navigate( destination )
  @incoming = @map.find_incoming_links(destination)

  @map.navigate( destination )
  refresh_display
end

#open(filename) ⇒ Object 



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# File 'lib/dog/viewer.rb', line 276

def open( filename )
  begin
    handler = get_handler( filename )
    if handler
      system("#{handler["open"].gsub('%%',filename)}")
      refresh_display
    elsif filename[0] == '@'
      navigate( filename )
    else
      @preview.setpos(0,0)
      @preview.addstr("No matching open handler found")
    end
  rescue => e
    @preview.setpos(0,0)
    @preview.addstr(" Error opening #{filename}!\n#{e}")
  end
end

#preview_active_file ⇒ Object 



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# File 'lib/dog/viewer.rb', line 151

def preview_active_file
  preview_file( active_link )
end

#preview_file(filename) ⇒ Object 



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# File 'lib/dog/viewer.rb', line 237

def preview_file( filename )
  if !filename || filename == ""
    show(@link, "(empty!)")
    clear_window @preview
    @preview.refresh
    return
  end

  show(@link, filename)

  clear_window @preview

  begin
    handler = get_handler( filename )
    if handler
      @preview.setpos(0,0)
      @preview.addstr(
        `#{handler["preview"].gsub('%%',filename)}`
      )
    elsif filename[0] == '@'
      if @map.has_topic?(filename)
        @preview.setpos(0,0)
        @preview.addstr(@map.link_names(filename).join("\n"))
      else
        @preview.setpos(0,0)
        @preview.addstr("Topic not found! Open to create.")
      end
    else
      @preview.setpos(0,0)
      @preview.addstr("No matching preview handler found")
    end
  rescue => e
    @preview.setpos(0,0)
    @preview.addstr(" Error loading preview for #{filename}!\n#{e}")
  end

  @preview.refresh
end

#refresh_display ⇒ Object 



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# File 'lib/dog/viewer.rb', line 196

def refresh_display
  set_topic
  setup_menu( @left, @incoming )
  setup_menu( @right, @map.here )

  if ( @incoming.length == 0 )
    @active_window = @right
  end
  set_max_items

  @active_item = 0

  preview_file( active_link )
end

#resize ⇒ Object 



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# File 'lib/dog/viewer.rb', line 93

def resize
  colwidth = (cols/2).ceil + 1

  @topic.resize(1, cols)
  @left.resize(lines/3, colwidth)
  @right.resize(lines/3, colwidth)

  @link.resize(1, cols)
  @preview.resize(2*lines/3-2, cols)
  @status.resize(1, cols)

  @right.move(1, cols-colwidth)

  @link.move(lines/3+1, 0)
  @preview.move(lines/3+2, 0)
  @status.move(lines-1, 0)

  @windows.each do |window| window.refresh end
  navigate( @map.topic_name )
end

#save_handlers ⇒ Object 



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# File 'lib/dog/viewer.rb', line 80

def save_handlers
  File.write(HANDLERS_FILENAME, @link_handlers.to_yaml)
end

#set_max_items ⇒ Object 



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# File 'lib/dog/viewer.rb', line 181

def set_max_items
  if @active_window == @left
    @max_items = @incoming.length
  else
    @max_items = @map.count
  end
end

#set_topic ⇒ Object 



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# File 'lib/dog/viewer.rb', line 163

def set_topic
  show(@topic, @map.topic_name)
end

#setup_menu(window, location) ⇒ Object 



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# File 'lib/dog/viewer.rb', line 125

def setup_menu( window, location )
  clear_window window
  location&.each_with_index do |link, index|
    add_menu_item( window, index, link["name"] )
  end
  window.refresh
end

#show(window, text) ⇒ Object 



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# File 'lib/dog/viewer.rb', line 211

def show( window, text )
  clear_window window

  if window == @link || window == @topic || window == @status
    text = " #{text} "
    window.setpos(0, centerx(text))
  elsif window == @preview
    window.setpos(0, 0)
  else
    window.setpos(1, 1)
  end

  window.addstr text
  window.refresh
end

#swap_window ⇒ Object 



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# File 'lib/dog/viewer.rb', line 167

def swap_window
  if @active_window == @left
    @active_window = @right
    @max_items = @map.count
  else
    if @incoming.length > 0
      @active_window = @left
      @max_items = @incoming.length
    end
  end
  wrap_cursor
  preview_active_file
end

#view ⇒ Object 



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# File 'lib/dog/viewer.rb', line 352

def view
  init_screen
  start_color
  curs_set(0)
  noecho
  cbreak

  @preview.keypad(true)

  @windows = [@topic, @left, @right, @link, @preview, @status]
  @windows.each do |window|
    clear_window window
  end

  @active_window = @right
  @active_item = 0
  @max_items = 0
  @incoming = []

  @name_field = Field.new( 1, cols - 4, 2, 2, 0, 0 )
  @name_field.set_back(A_UNDERLINE)
  @name_field.opts_off(O_BLANK | O_STATIC)
  @link_field = Field.new( 1, cols - 4, 5, 2, 0, 0 )
  @link_field.set_back(A_UNDERLINE)
  @link_field.opts_off(O_BLANK | O_STATIC)

  @form = Form.new( [@name_field, @link_field] )
  @form.set_win @preview

  @editing = false


  refresh_display
  show(@status, "woof! - press ? for help")

  while ch = @right.getch
    show(@status, "woof! - press ? for help")

    case ch
    when KEY_RESIZE
      resize
    when 's'
      @map.save
      save_handlers
      show(@status, "saved!")
    when 'J'
      if @active_window == @right
        @map.move_down(index: @active_item)
        move_cursor( 1 )
      end
    when 'K'
      if @active_window == @right
        @map.move_up(index: @active_item)
        move_cursor( -1 )
      end
    when 'j'
      move_cursor( 1 )
    when 'k'
      move_cursor( -1 )
    when 'h'
      swap_window
    when 'l'
      swap_window
    when ' '
      open(active_link)
    when '?'
      show(@preview, HELP_TEXT)
    when 'q'
      break
    when 'n'
      clear_window @preview
      @name_field.set_buffer(0, "")
      @link_field.set_buffer(0, "")
      @form.post
      @preview.setpos(1,0)
      @preview.addstr("name:")
      @preview.setpos(4,0)
      @preview.addstr("link:")
      @preview.refresh
      show(@link, "(new link)")

      @editing = false

      @form.driver(REQ_FIRST_FIELD)

      menu_loop
    when 'e'
      if @active_window == @right
        clear_window @preview
        @name_field.set_buffer(0, @map.name(index: @active_item))
        @link_field.set_buffer(0, @map.path(index: @active_item))
        @form.post
        @preview.setpos(1,0)
        @preview.addstr("name:")
        @preview.setpos(4,0)
        @preview.addstr("link:")
        @preview.refresh
        show(@link, "(edit link)")

        @editing = true

        @form.driver(REQ_FIRST_FIELD)

        menu_loop
      end
    when 'd'
      if @active_window == @right
        clear_window @preview
        @preview.setpos(1,0)
        @preview.addstr("really delete link \"#{@map.name(index: @active_item)}\"?")
        @preview.setpos(3,0)
        @preview.addstr("y / n")
        @preview.refresh
        if @preview.getch == 'y'
          if active_link[0] == "@" && @map.find_incoming_links( active_link ).length == 1
            target = @map.path(index: @active_item)
            clear_window @preview
            @preview.setpos(1,0)
            @preview.addstr("this change strands the topic \"#{target}\".")
            @preview.setpos(2,0)
            @preview.addstr("do you want to delete that topic, too?")
            @preview.setpos(3,0)
            @preview.addstr("y / n")
            @preview.refresh

            if @preview.getch == 'y'
              @map.remove_topic(target)
            end
          end

          @map.remove_link(name: @map.name(index: @active_item))
        end
        @max_items = @map.here.length
        wrap_cursor
        preview_active_file
      end
    end

    if @active_window == @left
      setup_menu( @right, @map.here )
      setup_menu( @left, @incoming )
    else
      setup_menu( @left, @incoming )
      setup_menu( @right, @map.here )
    end
    @status.refresh
    @active_window.refresh
  end

end

#wrap_cursor ⇒ Object 



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# File 'lib/dog/viewer.rb', line 133

def wrap_cursor
  @active_item = @max_items - 1 if @active_item < 0
  @active_item = 0 if @active_item >= @max_items
end