Class: KV::Screen

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

Defined Under Namespace

Classes: RenderStatus

Constant Summary collapse

LINE_ATTR = 
Curses::A_DIM
ANIMATION = 
['[O     ]',
'[o.    ]',
'[...   ]',
'[ ...  ]',
'[  ... ]',
'[   ...]',
'[    .o]',
'[     O]',
'[    .o]',
'[   ...]',
'[  ... ]',
'[  ... ]',
'[ ...  ]',
'[...   ]',
'[o.    ]',
]

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(input, lines: [], name: nil, search: nil, first_line: 0, following_mode: false, line_mode: false, separation_mode: false, time_stamp: nil, ext_input: nil, fifo_file: nil) ⇒ Screen

Returns a new instance of Screen.



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# File 'lib/kv.rb', line 31

def initialize input, lines: [],
               name: nil, search: nil, first_line: 0,
               following_mode: false, line_mode: false, separation_mode: false,
               time_stamp: nil, ext_input: nil, fifo_file: nil
  @rs = RenderStatus.new
  @last_rs = nil
  @rs.y = first_line
  @rs.goto = first_line if first_line > 0
  @rs.x = 0
  @rs.last_lineno = 0
  @rs.line_mode = line_mode
  @rs.search = search
  @rs.wrapping = false
  @rs.ts_mode = false

  @name = name
  @filename = @name if @name && File.exist?(@name)

  @time_stamp = time_stamp
  @ext_input = ext_input
  @fifo_file = fifo_file
  @separation_mode = separation_mode

  @lines = lines
  @mode = :screen

  @following = following_mode
  @apos = 0

  @mouse = false
  @search_ignore_case = false
  @search_regexp = true
  @loading = false
  @buffer_lines = 10_000
  @yq = Queue.new
  if @filename
    @load_unlimited = true
  else
    @load_unlimited = false
  end

  @prev_render = {}
  @meta = input.respond_to?(:meta) ? input.meta : nil

  read_async input if input
end

Instance Attribute Details

#x ⇒ Object

Returns the value of attribute x.



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# File 'lib/kv.rb', line 151

def x
  @x
end

Instance Method Details

#cattr(attr) ⇒ Object 



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# File 'lib/kv.rb', line 192

def cattr attr
  Curses.attron attr
  begin
    yield
  ensure
    Curses.attroff attr
  end
end

#check_update ⇒ Object 



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# File 'lib/kv.rb', line 362

def check_update
  if @loading == false
    if @filename && File.exist?(@filename) && File.mtime(@filename) > @file_mtime
      input = open(@filename)

      if input.size < @file_lastpos
        screen_status "#{@filename} is truncated. Rewinded."
        pause
        @lineno = 0
      else
        input.seek @file_lastpos
      end
      read_async input
    end
  end
end

#control ⇒ Object 



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# File 'lib/kv.rb', line 717

def control
  case @mode
  when :screen
    control_screen
  when :terminal
    control_terminal
  else
    raise
  end
end

#control_screen ⇒ Object 



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# File 'lib/kv.rb', line 500

def control_screen
  ev = render_screen

  case ev
  when 'q'
    raise PopScreen

  when Curses::KEY_UP, 'k'
    self.y -= 1
  when Curses::KEY_DOWN, 'j'
    self.y += 1
  when Curses::KEY_LEFT, 'h'
    self.x -= 1
  when Curses::KEY_RIGHT, 'l'
    self.x += 1
  when 'g'
    self.y = 0
    self.x = 0
  when 'G'
    self.y = self.y_max
    self.x = 0
  when ' ', Curses::KEY_NPAGE, Curses::KEY_CTRL_D
    self.y += Curses.lines-1
  when Curses::KEY_PPAGE, Curses::KEY_CTRL_U
    self.y -= Curses.lines-1

  when /[0-9]/
    screen_status "Goto:", ev
    ystr = input_str(/\d/, ev)
    if ystr && !ystr.empty?
      @rs.goto = ystr.to_i - 1
      self.y = @rs.goto
    end

  when 'F'
    @following = true
    set_load_unlimited true

  when 'L'
    set_load_unlimited !@load_unlimited

  when '/'
    search_str = ''.dup

    update_search_status = -> do
      regexp = @search_regexp ? 'regexp' : 'string'
      ignore = @search_ignore_case ? '/ignore' : ''
      screen_status "Search[#{regexp}#{ignore}]:", search_str
    end

    update_search_status[]
    input_str(/./, search_str, other_actions: {
      Curses::KEY_CTRL_I => -> ev do
        @search_ignore_case = !@search_ignore_case
        update_search_status[]
      end,
      Curses::KEY_CTRL_R => -> ev do
        @search_regexp = !@search_regexp
        update_search_status[]
      end,
    })

    if search_str && !search_str.empty?
      ic = @search_ignore_case ? [Regexp::IGNORECASE] : []
      if @search_regexp
        begin
          @rs.search = Regexp.compile(search_str, *ic)
        rescue RegexpError => e
          @rs.search = nil
          screen_status "regexp compile error: #{e.message}"
          pause
        end
      else
        @rs.search = Regexp.compile(Regexp.escape(search_str), *ic)
      end
    else
      @rs.search = nil
    end
    if @rs.search
      @rs.search.instance_variable_set(:@search_str, search_str)
      search_next self.y
    end
  when 'n'
    search_next self.y+1 if @rs.search
  when 'p'
    search_prev self.y-1 if @rs.search
  when 'f'
    if @rs.search
      filter_mode_title = "*filter mode [#{self.search_str}]*"
      if @name != filter_mode_title
        lines = @lines.grep(@rs.search)
        fscr = Screen.new nil, lines: lines, search: @rs.search, name: filter_mode_title
        raise PushScreen.new(fscr)
      end
    end

  when 's'
    screen_status "Save file:"
    file = input_str /./
    begin
      if file && !file.empty?
        if File.exist? file
          screen_status "#{file.dump} exists. Override? [y/n] "
          yn = input_str(/[yn]/)
          if yn == 'y'
            File.write(file, @lines.join("\n"))
          else
            # do nothing
            end
          else
            File.write(file, @lines.join("\n"))
          end
        end
      rescue SystemCallError
        # TODO: status line
      end

  when 'v'
    if @filename
      syste m("vi #{@filename} +#{self.y + 1}")
      @last_rs = nil
    end

  when 'P'
    begin
      if v = `gist -v` and /^gist v\d/ =~ v
        screen_status "gist-ing..."

        url = IO.popen('gist -p', 'a+'){|rw|
          @lines.each{|line| rw.puts line}
          rw.close_write
          rw.read
        }
        msg = "gist URL: #{url}"
        at_exit{
          puts msg
        }
        screen_status msg
        pause
      else
        raise v.inspect
      end
    rescue Errno::ENOENT
      screen_status 'gist command is not found'
      pause
    end

  when 'm'
    @mouse = !@mouse
    Curses.close_screen
    init_screen
  when Curses::KEY_MOUSE
    m = Curses.getmouse
    log m, "mouse ->"
    # log [m.bstate, m.x, m.y, m.z, m.eid]
    log @lines[self.y + m.y]

  when 'N'
    @rs.line_mode = !@rs.line_mode
  when 'T'
    @rs.ts_mode = !@rs.ts_mode if @time_stamp
  when 't'
    Curses.close_screen
    @mode = :terminal
  when 'x'
    while @ext_input && !@ext_input.closed?
      update_ext_status = -> str do
        screen_status "input for ext:", str
      end
      update_ext_status['']
      actions = {
        update: -> str do
          self.y = self.y_max
          render_data
          update_ext_status[str]
        end
      }
      str = input_str(/./, other_actions: actions)
      if str && !str.empty?
        @ext_input.puts str unless @ext_input.closed?
      else
        break
      end
    end

  when 'H'
    if @meta
      lines = @meta.map{|k, v| "#{k}: #{v}"}
      raise PushScreen.new(Screen.new nil, lines: lines, name: "Response header [#{@name}]")
    end

  when Curses::KEY_CTRL_G
    # do nothing

  when '?'
    raise PushScreen.new(Screen.new help_io)

  when nil
    # ignore

  when Curses::KEY_RESIZE
    # ignore

  else
    screen_status "unknown: #{key_name(ev)}"
    pause
  end
end

#control_terminal ⇒ Object 



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# File 'lib/kv.rb', line 709

def control_terminal
  @rs.instance_eval('binding').irb

  @mode = :screen
  init_screen
  @last_rs = nil
end

#ctimeout(ms) ⇒ Object 



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# File 'lib/kv.rb', line 201

def ctimeout ms
  Curses.timeout = ms
  begin
    yield
  ensure
    Curses.timeout = -1
  end
end

#init_screen ⇒ Object 



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# File 'lib/kv.rb', line 167

def init_screen
  Curses.init_screen
  Curses.stdscr.keypad(true)

  if @mouse
    Curses.mousemask(Curses::BUTTON1_CLICKED | Curses::BUTTON2_CLICKED |
                     Curses::BUTTON3_CLICKED | Curses::BUTTON4_CLICKED)
  else
    Curses.mousemask(0)
  end

  if @loading && self.y_max < @rs.y
    log [:going, self.y_max, @rs.y]
    @following = :going
  end
  self.y = @rs.y
end

#input_str(pattern, str = ''.dup, other_actions: {}) ⇒ Object 



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# File 'lib/kv.rb', line 467

def input_str pattern, str = ''.dup, other_actions: {}
  update_action = other_actions[:update]

  ctimeout update_action ? 200 : -1 do
    loop do
      ev = Curses.getch

      case ev
      when 10
        return str
      when Curses::KEY_BACKSPACE
        str.chop!
      when pattern
        str << ev
      when nil # timeout
        update_action[str]
      else
        if action = other_actions[ev]
          action.call(ev)
        else
          log "failure: #{key_name ev}"
          return nil
        end
      end
    end
  end
end

#key_name(ev) ⇒ Object 



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# File 'lib/kv.rb', line 460

def key_name ev
  Curses.constants.grep(/KEY/){|c|
    return c if Curses.const_get(c) == ev
  }
  ev
end

#pause ⇒ Object 



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# File 'lib/kv.rb', line 495

def pause
  ev = Curses.getch
  Curses.ungetch ev if ev
end

#read_async(input) ⇒ Object 



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# File 'lib/kv.rb', line 85

def read_async input
  @loading = true
  begin
    data = input.read_nonblock(800_000)
  rescue IO::EAGAINWaitReadable, EOFError
    data = ''
  end

  last_line = nil
  data.each_line{|line|
    if line[-1] != "\n"
      last_line = line
      break
    end
    @lines << setup_line(line)
  }

  Thread.abort_on_exception = true
  @reader_thread = Thread.new do
    while line = input.gets
      if last_line
        line = last_line + line
        last_line = nil
      end

      @lines << setup_line(line)

      while !@load_unlimited && @lines.size > self.y + @buffer_lines
        @yq.pop; @yq.clear
      end
      @yq.clear
    end
  ensure
    if @filename
      @file_mtime = File.mtime(@filename)
      @file_lastpos = input.tell
    elsif @fifo_file
      input = open(@fifo_file)
      log(input)
      redo
    end
    input.close
    @loading = false
  end
end

#redraw! ⇒ Object 



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# File 'lib/kv.rb', line 728

def redraw!
  @last_rs = nil
end

#render_data ⇒ Object 



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# File 'lib/kv.rb', line 212

def render_data
  # check update
  c_lines = @rs.c_lines = Curses.lines
  c_cols = @rs.c_cols  = Curses.cols

  if @rs != @last_rs
    @last_rs = @rs.dup
  else
    return
  end

  Curses.clear

  if @separation_mode && (lines = @lines[self.y ... (self.y + c_lines - 1)])
    max_cols = []
    lines.each.with_index{|line, ln|
      line.split("\t").each_with_index{|w, i|
        max_cols[i] = max_cols[i] ? [max_cols[i], w.size].max : w.size
      }
    }
  end

  (c_lines-1).times{|i|
    lno = i + self.y
    line = @lines[lno]
    cols = c_cols

    unless line
      if lno == @lines.size
        Curses.setpos i, 0
        cattr LINE_ATTR do
          Curses.addstr '(END)'
        end
      end

      break
    end

    Curses.setpos i, 0

    if @rs.line_mode
      cattr LINE_ATTR do
        lineno = line.instance_variable_get(:@lineno)
        ln_str = '%5d |' % lineno
        if @rs.goto == lineno - 1 || (@rs.search && (@rs.search === line))
          standout do
            Curses.addstr(ln_str)
          end
        else
          Curses.addstr(ln_str)
        end
        cols -= ln_str.size
      end
    end

    if @rs.ts_mode && ts = line.instance_variable_get(:@time_stamp)
      cattr LINE_ATTR do
        ts = line.instance_variable_get(:@time_stamp)
        Curses.addstr("#{ts} |")
      end
    end

    line = line[self.x, cols] || ''

    if @separation_mode
      line = line.split(/\t/).tap{|e|
        if (max = max_cols.size) > 0
          # fill empty columns
          e[max - 1] ||= nil
        end
      }.map.with_index{|w, i|
        "%-#{max_cols[i]}s" % w
      }.join(' | ')
    end

    if !@rs.search || !(Regexp === @rs.search)
      Curses.addstr line
    else
      partition(line, @rs.search).each{|(matched, str)|
        if matched == :match
          standout{
            Curses.addstr str
          }
        else
          Curses.addstr str
        end
      }
    end
  }
end

#render_screen ⇒ Object 



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# File 'lib/kv.rb', line 379

def render_screen
  ev = nil

  ms = @following ? 100 : 500

  ctimeout ms do
    while ev == nil
      render_data
      render_status
      ev = Curses.getch
      check_update
      y_max = self.y_max

      if @following
        case @following
        when :searching
          break if search_next_move
        when :going
          if @rs.goto <= y_max
            self.y = @rs.goto
            break
          end
        when true
          # ok
        else
          raise "unknown following mode: #{@following}"
        end

        self.y = y_max
      end
    end

    @following = false
    set_load_unlimited false

    return ev
  end
end

#render_status ⇒ Object 



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# File 'lib/kv.rb', line 315

def render_status
  name = @name ? "<#{@name}>" : ''
  mouse  = @mouse ? ' [MOUSE]' : ''
  search = @rs.search ? " search[#{search_str}]" : ''
  loading = @loading ? " (loading...#{@load_unlimited ? '!' : nil}#{@following ? ' following' : ''}) " : ''
  x = self.x > 0 ? " x:#{self.x}" : ''
  screen_status "#{name} lines:#{self.y+1}/#{@lines.size}#{x}#{loading}#{search}#{mouse}"
end

#screen_status(status, post = nil) ⇒ Object 



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# File 'lib/kv.rb', line 341

def screen_status status, post = nil
  cols = Curses.cols
  line = Curses.lines-1
  Curses.setpos line, 0
  Curses.addstr ' '.ljust(cols)
  len  = status.size
  len += post.size if post

  standout{
    Curses.setpos Curses.lines-1, 0
    Curses.addstr status
  }
  Curses.addstr post if post

  if !post && len < cols - ANIMATION.first.size
    Curses.setpos line, cols - ANIMATION.first.size - 1
    @apos = (@apos + 1) % ANIMATION.size
    Curses.addstr ANIMATION[@apos]
  end
end

#search_next(start) ⇒ Object 



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# File 'lib/kv.rb', line 433

def search_next start
  @searching = start
  if search_next_move
    # OK. self.y is updated.
  else
    if @loading
      set_load_unlimited true
      @following = :searching
    else
      screen_status "not found: [#{self.search_str}]"
      pause
      @searching = false
    end
  end
end

#search_next_move ⇒ Object 



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# File 'lib/kv.rb', line 418

def search_next_move
  last_line = @lines.size
  # log (@searching..last_line)

  (@searching...last_line).each{|i|
    if @rs.search === @lines[i]
      self.y = i
      @searching = false
      return true
    end
  }
  @searching = last_line
  return false
end

#search_prev(start) ⇒ Object 



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# File 'lib/kv.rb', line 449

def search_prev start
  start.downto(0){|i|
    if @rs.search === @lines[i]
      self.y = i
      return true
    end
  }
  screen_status "not found: [#{self.search_str}]"
  pause
end

#search_str ⇒ Object 



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# File 'lib/kv.rb', line 303

def search_str
  if @rs.search
    if str = @rs.search.instance_variable_get(:@search_str)
      str
    else
      @rs.search.inspect
    end
  else
    nil
  end
end

#set_load_unlimited(b) ⇒ Object 



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# File 'lib/kv.rb', line 162

def set_load_unlimited b
  @load_unlimited = b
  @yq << true
end

#setup_line(line) ⇒ Object 



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# File 'lib/kv.rb', line 78

def setup_line line
  line = line.chomp
  line.instance_variable_set(:@time_stamp, Time.now.strftime('%H:%M:%S')) if @time_stamp
  line.instance_variable_set(:@lineno, @rs.last_lineno += 1)
  line
end

#standout ⇒ Object 



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# File 'lib/kv.rb', line 186

def standout
  Curses.standout
  yield
  Curses.standend
end

#y ⇒ Object 



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# File 'lib/kv.rb', line 136

def y
  @rs.y
end

#y=(y) ⇒ Object 



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# File 'lib/kv.rb', line 140

def y=(y)
  if y > (ym = self.y_max)
    @rs.y = ym
  else
    @rs.y = y
  end

  @rs.y = 0 if @rs.y < 0
  @yq << nil if @loading
end

#y_max ⇒ Object 



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# File 'lib/kv.rb', line 131

def y_max
  max = @lines.size - Curses.lines + 2
  max < 0 ? 0 : max
end