Module: Termfront::TerminalOutput

Defined in:
lib/termfront/terminal_output.rb

Class Method Summary collapse

Class Method Details

.begin_frame(home: false, clear: false) ⇒ Object 



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# File 'lib/termfront/terminal_output.rb', line 7

def begin_frame(home: false, clear: false)
  buf = +""
  buf << "\e[H" if home
  buf << "\e[2J" if clear
  buf
end

.end_frame ⇒ Object 



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# File 'lib/termfront/terminal_output.rb', line 14

def end_frame
  ""
end

.fit_ansi(text, width) ⇒ Object 



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# File 'lib/termfront/terminal_output.rb', line 18

def fit_ansi(text, width)
  out = +""
  visible = 0
  any_ansi = false
  i = 0
  len = text.bytesize
  segment_start = 0

  while i < len
    byte = text.getbyte(i)
    if byte == 0x1B
      out << text.byteslice(segment_start, i - segment_start) if i > segment_start

      esc_start = i
      i += 1
      while i < len
        b = text.getbyte(i)
        i += 1
        break if (b >= 65 && b <= 90) || (b >= 97 && b <= 122)
      end
      out << text.byteslice(esc_start, i - esc_start)
      any_ansi = true
      segment_start = i
    else
      if (byte & 0xC0) != 0x80
        break if visible >= width

        visible += 1
      end
      i += 1
    end
  end

  out << text.byteslice(segment_start, i - segment_start) if i > segment_start
  out << "\e[0m" if any_ansi
  (width - visible).times { out << " " } if visible < width
  out
end

.write_all(io, data) ⇒ Object 



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# File 'lib/termfront/terminal_output.rb', line 57

def write_all(io, data)
  total = 0
  bytes = data.bytesize

  while total < bytes
    begin
      written = io.syswrite(data.byteslice(total, bytes - total))
      total += written
    rescue IO::WaitWritable
      IO.select(nil, [io])
    end
  end

  total
end