Class: Fatty::Ansi::Renderer

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

Constant Summary collapse

CSI = 
"\e["

Instance Method Summary collapse

Constructor Details

#initialize(io: nil) ⇒ Renderer

Returns a new instance of Renderer.



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# File 'lib/fatty/ansi/renderer.rb', line 8

def initialize(io: nil)
  @io = io
end

Instance Method Details

#hide_cursor ⇒ Object 



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# File 'lib/fatty/ansi/renderer.rb', line 91

def hide_cursor
  "#{CSI}?25l"
end

#io ⇒ Object 



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# File 'lib/fatty/ansi/renderer.rb', line 83

def io
  @io || $stdout
end

#render_line(row:, col:, width:, text:, role:, palette:) ⇒ Object 



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# File 'lib/fatty/ansi/renderer.rb', line 12

def render_line(row:, col:, width:, text:, role:, palette:)
  spec = palette&.[](role)
  return unless spec

  msg = text.to_s.tr("\r\n", " ")

  segments = Fatty::Ansi.segment(msg).map do |segment_text, style|
    {
      text: segment_text,
      role: role,
      style: style,
    }
  end

  render_segments_line(
    row: row,
    col: col,
    width: width,
    segments: segments,
    palette: palette,
    fill_role: role,
  )
end

#render_segments_line(row:, col:, width:, segments:, palette:, fill_role: :output) ⇒ Object 



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# File 'lib/fatty/ansi/renderer.rb', line 36

def render_segments_line(row:, col:, width:, segments:, palette:, fill_role: :output)
  rendered = +""
  visible = 0
  segments.each do |seg|
    spec = palette&.[](seg[:role])
    next unless spec

    remaining = width - visible
    break if remaining <= 0

    text = Fatty::Ansi.truncate_visible(seg[:text].to_s, remaining)
    next if text.empty?

    visible += Fatty::Ansi.visible_length(text)

    sgr =
      if seg[:style]
        sgr_for_style(seg[:style], fallback_spec: spec)
      else
        sgr_for_spec(spec)
      end

    rendered << sgr
    rendered << text
  end

  if visible < width
    spec = palette&.[](fill_role)
    rendered << sgr_for_spec(spec) if spec
    rendered << (" " * (width - visible))
  end
  write_ansi("#{CSI}#{row + 1};#{col + 1}H", rendered, reset)
end

#show_cursor ⇒ Object 



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# File 'lib/fatty/ansi/renderer.rb', line 87

def show_cursor
  "#{CSI}?25h"
end

#write_ansi(*parts) ⇒ Object 



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# File 'lib/fatty/ansi/renderer.rb', line 70

def write_ansi(*parts)
  text = parts.join

  if defined?(::Curses) && ::Curses.respond_to?(:putp)
    ::Curses.putp(text)
  else
    io.write(text)
    io.flush
  end

  nil
end