Module: Hiiro::Tui::Terminal

Included in:
ListScreen
Defined in:
lib/hiiro/tui.rb

Instance Method Summary collapse

Instance Method Details

#center_text(text, cols) ⇒ Object 



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# File 'lib/hiiro/tui.rb', line 63

def center_text(text, cols)
  truncated = truncate(text, cols)
  return truncated if truncated.length >= cols

  left_padding = [(cols - truncated.length) / 2, 0].max
  (' ' * left_padding) + truncated
end

#env_dimension(name) ⇒ Object 



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# File 'lib/hiiro/tui.rb', line 87

def env_dimension(name)
  value = ENV[name].to_i
  return nil unless value.positive?

  value
end

#read_escape_char(input) ⇒ Object 



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# File 'lib/hiiro/tui.rb', line 41

def read_escape_char(input)
  return nil unless IO.select([input], nil, nil, 0.02)

  input.getch
end

#read_key(input) ⇒ Object 



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# File 'lib/hiiro/tui.rb', line 19

def read_key(input)
  char = input.getch
  return :ctrl_c if char == "\u0003"
  return :enter if char == "\r" || char == "\n"

  if char == "\e"
    first = read_escape_char(input)
    return :escape if first.nil?
    return :escape unless first == '['

    case read_escape_char(input)
    when 'A' then :up
    when 'B' then :down
    when 'C' then :right
    when 'D' then :left
    else :escape
    end
  else
    char
  end
end

#terminal_cols ⇒ Object 



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# File 'lib/hiiro/tui.rb', line 53

def terminal_cols
  env_dimension('COLUMNS') || IO.console.winsize[1]
rescue StandardError
  80
end

#terminal_line(text, cols) ⇒ Object 



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# File 'lib/hiiro/tui.rb', line 59

def terminal_line(text, cols)
  truncate(text, cols) + "\e[K"
end

#terminal_rows ⇒ Object 



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# File 'lib/hiiro/tui.rb', line 47

def terminal_rows
  env_dimension('LINES') || IO.console.winsize[0]
rescue StandardError
  24
end

#truncate(text, cols) ⇒ Object 



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# File 'lib/hiiro/tui.rb', line 71

def truncate(text, cols)
  return text if text.length <= cols
  return text[0, cols] if cols <= 1

  text[0, cols - 1] + '…'
end

#visible_text(text, cols, offset = 0) ⇒ Object 



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# File 'lib/hiiro/tui.rb', line 78

def visible_text(text, cols, offset = 0)
  return truncate(text, cols) if offset <= 0

  clipped = text[offset..] || ''
  return truncate(clipped, cols) if cols <= 1

  truncate("«#{clipped}", cols)
end

#with_screen ⇒ Object 



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# File 'lib/hiiro/tui.rb', line 6

def with_screen
  input = $stdin
  $stdout.write("\e[?1049h\e[?25l")
  $stdout.flush

  input.raw do
    yield input
  end
ensure
  $stdout.write("\r\e[0m\e[?25h\e[?1049l")
  $stdout.flush
end