Class: Fatty::OutputBuffer

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

Constant Summary collapse

DEFAULT_MAX_LINES = 
10_000

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(max_lines: DEFAULT_MAX_LINES) ⇒ OutputBuffer

Returns a new instance of OutputBuffer.



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# File 'lib/fatty/output_buffer.rb', line 10

def initialize(max_lines: DEFAULT_MAX_LINES)
  @lines = []
  @scroll = 0
  @max_lines = Integer(max_lines)
  @line_open = false
end

Instance Attribute Details

#lines ⇒ Object (readonly)

Returns the value of attribute lines.



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# File 'lib/fatty/output_buffer.rb', line 7

def lines
  @lines
end

#max_lines ⇒ Object

Returns the value of attribute max_lines.



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# File 'lib/fatty/output_buffer.rb', line 8

def max_lines
  @max_lines
end

Instance Method Details

#append(text) ⇒ Object

Append text to the output buffer. Text may contain complete lines, partial lines, or both. Returns the number of lines trimmed. The Terminal can use this to adjust the Viewport.



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# File 'lib/fatty/output_buffer.rb', line 20

def append(text)
  ntrimmed = 0
  str = text.to_s
  return ntrimmed if str.empty?

  str.split(/(\n)/).each do |part|
    if part == "\n"
      if @line_open
        @line_open = false
      else
        ntrimmed += append_new_line("")
      end
    elsif !part.empty?
      ntrimmed += append_fragment(part)
    end
  end

  ntrimmed
end

#scroll_down ⇒ Object 



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# File 'lib/fatty/output_buffer.rb', line 49

def scroll_down
  @scroll -= 1 if @scroll.positive?
end

#scroll_up ⇒ Object 



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# File 'lib/fatty/output_buffer.rb', line 45

def scroll_up
  @scroll += 1
end

#visible_lines(height) ⇒ Object 



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# File 'lib/fatty/output_buffer.rb', line 40

def visible_lines(height)
  start = [@lines.length - height - @scroll, 0].max
  @lines[start, height] || []
end