Class: VER::Buffer::Terminal

Inherits:
Object
  • Object
show all
Defined in:
lib/ver/buffer/term.rb

Constant Summary collapse

ANSI_CODES = 
[]
FG_COLORS = 
[:black, :red, :green, :yellow, :blue, :magenta, :cyan, :white]
BG_COLORS = 
[:on_black, :on_red, :on_green, :on_yellow, :on_blue, :on_magenta, :on_cyan, :on_white]

Instance Method Summary collapse

Constructor Details

#initialize(parent) ⇒ Terminal

Returns a new instance of Terminal.



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# File 'lib/ver/buffer/term.rb', line 6

def initialize(parent)
  @parent = parent
  setup_widgets
  pty
end

Instance Method Details

#ansi2sym(ansi) ⇒ Object 



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# File 'lib/ver/buffer/term.rb', line 242

def ansi2sym(ansi)
  COLORS[ansi.to_i]
end

#bench(name, &block) ⇒ Object 



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# File 'lib/ver/buffer/term.rb', line 12

def bench(name, &block)
  require 'benchmark'
  p name => Benchmark.realtime(&block)
end

#color(fg, bg = nil) ⇒ Object 



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# File 'lib/ver/buffer/term.rb', line 178

def color(fg, bg = nil)
  if bg
    fg, bg = ANSI_CODES[fg.to_i], ANSI_CODES[bg.to_i]

    @tag = [:ansi, fg, bg].join('_')
    @text.tag_configure @tag, options_for(@tag, fg, bg)
  else
    fg = ANSI_CODES[fg.to_i]

    @tag = [:ansi, fg].join('_')
    @text.tag_configure @tag, options_for(@tag, fg)
  end
end

#delete(*indices) ⇒ Object 



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# File 'lib/ver/buffer/term.rb', line 251

def delete(*indices)
  # p delete: indices
  @text.delete(*indices)
end

#destroy ⇒ Object 



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# File 'lib/ver/buffer/term.rb', line 39

def destroy
  @text.destroy
rescue Errno::EIO, PTY::ChildExited
ensure
  @parent.focus
end

#font_for(options) ⇒ Object 



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# File 'lib/ver/buffer/term.rb', line 237

def font_for(options)
  @fonts ||= {}
  @fonts[options] ||= Tk::Font.new(options)
end

#insert(index, chars) ⇒ Object 



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# File 'lib/ver/buffer/term.rb', line 246

def insert(index, chars)
  # p insert: [index, chars]
  @text.insert(index, chars, @tag)
end

#on_chunk(chunk) ⇒ Object

Trying to build a little dictionary of escape patterns:

| Sequence | Meaning | | e]0; | reset fg/bg | | e[?1034h | ??? | | e[01;34mbine | fg: 1, bg: 34 |



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# File 'lib/ver/buffer/term.rb', line 109

def on_chunk(chunk)
  @buffer ||= ''
  @buffer << chunk
  s = StringScanner.new(@buffer)

  until s.eos?
    pos = s.pos

    case s.peek(1)
    when "\e"
      if    s.scan(/\e\](\d+);/)
        color s[1]
      elsif s.scan(/\e\[(\d+)([A-Z])/)
        color s[1]
      elsif s.scan(/\e\[\?(\d+h)/)
        color s[1]
      elsif s.scan(/\e\[(\d+);(\d+)m/) # \e[01;34m
        color s[1], s[2]
      elsif s.scan(/\e\[(\d+)[m;]/)
        color s[1]
      elsif s.scan(/\e\[([A-Z])/)
        color s[1]
      elsif s.scan(/\e\[m/)
        # nothing?
      elsif s.scan(/\e=\r/)
        delete 'insert linestart', 'insert lineend'
      else
        p s.rest
      end
    when "\r"
      if s.scan(/\r\n/)
        insert :end, "\n"
      elsif s.scan(/\r\r/)
        delete 'insert linestart', 'insert lineend'
      elsif s.scan(/\r[^\n\r]/)
        p :no_rn => s.matched
      else
        p :r_fail => s.rest
      end
    when "\x07"
      s.pos += 1
      delete 'insert linestart', 'insert lineend'
    when "\x08"
      s.pos += 1
      delete 'insert - 1 chars'
    else
      if s.scan(/\A[^\e\r\x08\x07]+/)
        insert :end, s.matched
      end
    end
   #  p s.matched

    if s.pos == pos
      warn("Scanner stopped at: %p" % [s])
      @buffer = s.rest
      return
    end
  end

  @buffer = ''
  @text.see :end
rescue StringScanner::Error => ex
  VER.error(ex)
rescue => ex
  puts "#{ex.class}: #{ex}", *ex.backtrace
  @buffer = ''
  destroy
end

#options_for(tag, fg, bg = nil) ⇒ Object 



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# File 'lib/ver/buffer/term.rb', line 195

def options_for(tag, fg, bg = nil)

  if found = @option_cache[tag]
    return found
  end

  options = {}

  case fg
  when nil
  when :reset
    options[:font] = @font
    options[:background] = nil
    options[:foreground] = nil
  when :bold
    options[:font] = font_for(@font_actual.merge(weight: :bold))
  when *FG_COLORS
    options[:foreground] = fg
  when *BG_COLORS
    options[:background] = bg.to_s.sub(/on_/, '')
  else
    p fg: fg
  end

  case bg
  when nil
  when :reset
    options[:font] = @font
    options[:background] = nil
    options[:foreground] = nil
  when *FG_COLORS
    options[:foreground] = bg
  when *BG_COLORS
    options[:background] = bg.to_s.sub(/on_/, '')
  else
    p bg: bg
  end

  @option_cache[options] = options
  options
end

#pty ⇒ Object 



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# File 'lib/ver/buffer/term.rb', line 46

def pty
  @pty_queue = queue = Queue.new

  Thread.new do
    shell = ENV['SHELL'] || 'bash'

    PTY.spawn(shell) do |r_pty, w_pty, pid|
      Thread.new do
        while chunk = queue.shift
          w_pty.print chunk
          w_pty.flush
        end
      end

      begin
        loop do
          c = r_pty.sysread(1 << 15)
          on_chunk(c) if c
        end
      rescue Errno::EIO, PTY::ChildExited
        destroy
      end
    end
  end
rescue Errno::EIO, PTY::ChildExited
  destroy
end

#setup_widgets ⇒ Object 



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# File 'lib/ver/buffer/term.rb', line 17

def setup_widgets
  Tk.set_palette('black') # maybe use themes instead?

  @option_cache ||= {}
  @font ||= VER.options[:font]
  @font_actual ||= @font.actual_hash

  @text = Tk::Text.new(font: @font, insertofftime: 1)
  @text.pack expand: true, fill: :both
  @text.focus

  @text.bind('<Key>'){|event|
    @pty_queue << event.unicode
    Tk.callback_break
  }

  @text.bind('<Return>'){|event|
    @pty_queue << event.unicode
    # Tk.callback_break
  }
end