Class: Xim::Editor

Inherits:
Object
  • Object
show all
Includes:
Curses
Defined in:
lib/xim/editor.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(opts = {}) ⇒ Editor

Returns a new instance of Editor.



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# File 'lib/xim/editor.rb', line 9

def initialize(opts = {})
  @opts = opts

  @mode = :normal

  file = @opts[:file]

  init_screens

  if file
    load_file(:file => file)
  else
    new_file
  end

  main_loop
end

Instance Attribute Details

#mode ⇒ Object

Returns the value of attribute mode.



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# File 'lib/xim/editor.rb', line 7

def mode
  @mode
end

Instance Method Details

#command_area_clear ⇒ Object 



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# File 'lib/xim/editor.rb', line 337

def command_area_clear
  @command_scr.attrset(A_NORMAL)
  @command_scr.clear
  @command_scr.refresh
end

#command_delete ⇒ Object 



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# File 'lib/xim/editor.rb', line 276

def command_delete
  if @command_x == 0
    command_area_clear
    normal_mode
  else
    @command_scr.setpos(0, @command_scr.curx - 1)
    @command_x -= 1
    @command_scr.delch
    @command_string.slice!(@command_x)
    @command_scr.refresh
  end
end

#command_entry(ch) ⇒ Object 



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# File 'lib/xim/editor.rb', line 269

def command_entry(ch)
  @command_scr.addch(ch)
  @command_string = @command_string.insert(@command_x, ch)
  @command_x += 1
  @command_scr.refresh
end

#command_mode ⇒ Object 



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# File 'lib/xim/editor.rb', line 243

def command_mode
  @main_x = @main_scr.curx
  @main_y = @main_scr.cury

  @command_string = ""
  @command_x = 0
  @command_y = 0

  @command_scr.setpos(0, 0)
  @command_scr.deleteln
  @command_scr.addstr(":")
  @command_scr.refresh

  @mode = :command
end

#command_status_error(error) ⇒ Object 



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# File 'lib/xim/editor.rb', line 329

def command_status_error(error)
  command_area_clear
  @command_scr.attron(color_pair(COLOR_RED)|A_BOLD)
  @command_scr.addstr(error)
  @command_scr.attrset(A_NORMAL)
  @command_scr.refresh
end

#command_status_update(status) ⇒ Object 



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# File 'lib/xim/editor.rb', line 323

def command_status_update(status)
  command_area_clear
  @command_scr.addstr(status)
  @command_scr.refresh
end

#command_submit ⇒ Object 



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# File 'lib/xim/editor.rb', line 289

def command_submit
  command_area_clear
  command_submit_process(@command_string)
  normal_mode
end

#command_submit_process(command) ⇒ Object 



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# File 'lib/xim/editor.rb', line 295

def command_submit_process(command)
  case command
  when 'w'
    command_write
  when 'q'
    quit
  end
end

#command_write ⇒ Object 



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# File 'lib/xim/editor.rb', line 304

def command_write
  if @file_name
    tmpf = temp_file(@file_name)
    f = File.open(tmpf, 'w')
    @file_contents.each do |line|
      f.write(line)
    end
    f.close
    File.rename(tmpf, @file_name)
    command_status_update("\"#{@file_name}\" written")
  else
    command_status_error("E32: No file name")
  end
end

#cursor_del ⇒ Object 



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# File 'lib/xim/editor.rb', line 195

def cursor_del
  if @file_x < (@file_contents[@file_y].length - 2)
    @main_scr.delch
    @file_contents[@file_y].slice!(@file_x)
  elsif @file_x == (@file_contents[@file_y].length - 2)
    @main_scr.delch
    cursor_left
    @file_contents[@file_y].slice!(@file_x)
  end
  @main_scr.refresh
end

#cursor_del_left ⇒ Object 



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# File 'lib/xim/editor.rb', line 207

def cursor_del_left
  if @file_x < (@file_contents[@file_y].length - 2)
    unless @main_scr.curx == 0
      cursor_left
      @main_scr.delch
      @file_contents[@file_y].slice!(@file_x)
    end
  end
  @main_scr.refresh
end

#cursor_down ⇒ Object 



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# File 'lib/xim/editor.rb', line 160

def cursor_down
  if @file_y < (@file_contents.length - 1)
    if @main_scr.cury == (@main_scr.maxy - 1)
      scroll_down
    else
      @main_scr.setpos(@main_scr.cury + 1, @main_scr.curx)
    end
    @file_y += 1

    if @file_x >= (@file_contents[@file_y].length - 2)
      @max_x = @file_contents[@file_y].length - 1
      @main_scr.setpos(@main_scr.cury, @max_x)
      @file_x = @max_x
    end

    update_status_line
  end
end

#cursor_left ⇒ Object 



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# File 'lib/xim/editor.rb', line 187

def cursor_left
  if @file_x > 0
    @main_scr.setpos(@main_scr.cury, @main_scr.curx - 1)
    @file_x -= 1
    update_status_line
  end
end

#cursor_right ⇒ Object 



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# File 'lib/xim/editor.rb', line 179

def cursor_right
  if @file_x < (@file_contents[@file_y].length - 2)
    @main_scr.setpos(@main_scr.cury, @main_scr.curx + 1)
    @file_x += 1
    update_status_line
  end
end

#cursor_up ⇒ Object 



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# File 'lib/xim/editor.rb', line 141

def cursor_up
  if @file_y > 0
    if (@main_scr.cury == 0)
      scroll_up
    else
      @main_scr.setpos(@main_scr.cury - 1, @main_scr.curx)
    end
    @file_y -= 1

    if @file_x >= (@file_contents[@file_y].length - 2)
      @max_x = @file_contents[@file_y].length - 1
      @main_scr.setpos(@main_scr.cury, @max_x)
      @file_x = @max_x
    end

    update_status_line
  end
end

#init_screens ⇒ Object 



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# File 'lib/xim/editor.rb', line 27

def init_screens
  Curses.init_screen
  Curses.start_color

  Curses.init_pair(COLOR_RED,COLOR_WHITE,COLOR_RED)

  @screen = Curses::Window.new(0,0,0,0)
  @screen.keypad(true)

  @main_scr = @screen.subwin(@screen.maxy-2,0,0,0)
  @main_scr.keypad(true)
  @main_scr.idlok(true)
  @main_scr.scrollok(true)
  @main_scr.setscrreg(0, @screen.maxy)
  @main_scr.refresh

  @status_scr = @screen.subwin(1,0,@screen.maxy-2,0)
  @status_scr.keypad(true)
  @status_scr.refresh
  @status_scr.attrset(Curses::A_REVERSE)

  @command_scr = @screen.subwin(1,0,@screen.maxy-1,0)
  @command_scr.keypad(true)
  @command_scr.refresh

  Curses.noecho
  Curses.cbreak
  Curses.raw

  @screen.setpos(0, 0)
  @screen.refresh
end

#insert_entry(ch) ⇒ Object 



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# File 'lib/xim/editor.rb', line 343

def insert_entry(ch)
  @main_scr.insch(ch)
  @file_contents[@file_y] = @file_contents[@file_y].insert(@file_x, ch)
  cursor_right
  @main_scr.refresh
end

#insert_mode ⇒ Object 



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# File 'lib/xim/editor.rb', line 265

def insert_mode
  @mode = :insert
end

#load_file(opts = {}) ⇒ Object 



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# File 'lib/xim/editor.rb', line 60

def load_file(opts = {})
  @file_name = opts[:file]

  @file_x = 0
  @file_y = 0

  f = File.open(@file_name)
  @file_contents = f.readlines()

  @file_contents.each do |line|
    @main_scr.addstr(line)
  end

  @main_scr.setpos(0,0)
  @main_scr.refresh
  update_status_line
end

#main_loop ⇒ Object 



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# File 'lib/xim/editor.rb', line 92

def main_loop
  loop do
    react_to_key
  end
rescue Interrupt => e
  quit
end

#new_file(opts = {}) ⇒ Object 



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# File 'lib/xim/editor.rb', line 78

def new_file(opts = {})
  @file_x = 0
  @file_y = 0
  @file_contents = ["\n"]
  @file_name = nil
  update_status_line
end

#normal_mode ⇒ Object 



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# File 'lib/xim/editor.rb', line 259

def normal_mode
  @main_scr.refresh

  @mode = :normal
end

#quit ⇒ Object 



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# File 'lib/xim/editor.rb', line 86

def quit
  Curses.close_screen
  puts "closing ..."
  exit(0)
end

#react_to_key ⇒ Object 



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# File 'lib/xim/editor.rb', line 100

def react_to_key
  case @mode
  when :normal then react_to_key_normal
  when :command then react_to_key_command
  when :insert then react_to_key_insert
  end
end

#react_to_key_command ⇒ Object 



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# File 'lib/xim/editor.rb', line 123

def react_to_key_command
  ch = @command_scr.getch
  case ch.ord
  when 10 then command_submit
  when 32..126 then command_entry(ch)
  when 127 then command_delete
  when 27 then normal_mode
  end
end

#react_to_key_insert ⇒ Object 



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# File 'lib/xim/editor.rb', line 133

def react_to_key_insert
  ch = @screen.getch
  case ch.ord
  when 10, 32..126 then insert_entry(ch)
  when 27 then normal_mode
  end
end

#react_to_key_normal ⇒ Object 



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# File 'lib/xim/editor.rb', line 108

def react_to_key_normal
  case @screen.getch
  when Curses::Key::UP then cursor_up
  when Curses::Key::DOWN then cursor_down
  when Curses::Key::RIGHT then cursor_right
  when Curses::Key::LEFT then cursor_left
  when ?x then cursor_del
  when ?X then cursor_del_left
  when ?u then scroll_up
  when ?d then scroll_down
  when ?: then command_mode
  when ?i then insert_mode
  end
end

#scroll_down ⇒ Object 



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# File 'lib/xim/editor.rb', line 222

def scroll_down
  @main_scr.scrl(1)
end

#scroll_up ⇒ Object 



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# File 'lib/xim/editor.rb', line 218

def scroll_up
  @main_scr.scrl(-1)
end

#status_line ⇒ Object 



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# File 'lib/xim/editor.rb', line 239

def status_line
  "#{@file_name ? @file_name : '[No Name]'} [#{@file_x},#{@file_y}]"
end

#temp_file(orig_file) ⇒ Object 



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# File 'lib/xim/editor.rb', line 319

def temp_file(orig_file)
  orig_file + '.tmp.' + Random.new.rand(1000000).to_s
end

#update_status_line ⇒ Object 



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# File 'lib/xim/editor.rb', line 226

def update_status_line
  x = @main_scr.curx
  y = @main_scr.cury

  @status_scr.setpos(0, 0)
  @status_scr.deleteln
  @status_scr.addstr(status_line)
  @status_scr.refresh

  @main_scr.setpos(y,x)
  @main_scr.refresh
end