Module: CLI::UI::ANSI

Extended by:
T::Sig
Defined in:
lib/cli/ui/ansi.rb

Constant Summary collapse

ESC = 
"\x1b"

Class Method Summary collapse

Methods included from T::Sig

sig

Class Method Details

.clear_to_end_of_line ⇒ Object 



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# File 'lib/cli/ui/ansi.rb', line 206

def clear_to_end_of_line
  control('', 'K')
end

.control(args, cmd) ⇒ Object 



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# File 'lib/cli/ui/ansi.rb', line 60

def control(args, cmd)
  ESC + '[' + args + cmd
end

.cursor_back(n = 1) ⇒ Object 



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# File 'lib/cli/ui/ansi.rb', line 118

def cursor_back(n = 1)
  return '' if n.zero?

  control(n.to_s, 'D')
end

.cursor_down(n = 1) ⇒ Object 



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# File 'lib/cli/ui/ansi.rb', line 92

def cursor_down(n = 1)
  return '' if n.zero?

  control(n.to_s, 'B')
end

.cursor_forward(n = 1) ⇒ Object 



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# File 'lib/cli/ui/ansi.rb', line 105

def cursor_forward(n = 1)
  return '' if n.zero?

  control(n.to_s, 'C')
end

.cursor_horizontal_absolute(n = 1) ⇒ Object 



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# File 'lib/cli/ui/ansi.rb', line 131

def cursor_horizontal_absolute(n = 1)
  cmd = control(n.to_s, 'G')
  cmd += cursor_back if CLI::UI::OS.current.shift_cursor_back_on_horizontal_absolute?
  cmd
end

.cursor_restore ⇒ Object 



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# File 'lib/cli/ui/ansi.rb', line 176

def cursor_restore
  control('', 'u')
end

.cursor_save ⇒ Object 



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# File 'lib/cli/ui/ansi.rb', line 169

def cursor_save
  control('', 's')
end

.cursor_up(n = 1) ⇒ Object 



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# File 'lib/cli/ui/ansi.rb', line 79

def cursor_up(n = 1)
  return '' if n.zero?

  control(n.to_s, 'A')
end

.enter_alternate_screen ⇒ Object 



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# File 'lib/cli/ui/ansi.rb', line 138

def enter_alternate_screen
  control('?1049', 'h')
end

.exit_alternate_screen ⇒ Object 



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# File 'lib/cli/ui/ansi.rb', line 143

def exit_alternate_screen
  control('?1049', 'l')
end

.hide_cursor ⇒ Object 



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# File 'lib/cli/ui/ansi.rb', line 162

def hide_cursor
  control('', '?25l')
end

.match_alternate_screen ⇒ Object 



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# File 'lib/cli/ui/ansi.rb', line 148

def match_alternate_screen
  /#{Regexp.escape(control("?1049", ""))}[hl]/
end

.next_line ⇒ Object 



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# File 'lib/cli/ui/ansi.rb', line 183

def next_line
  cursor_down + cursor_horizontal_absolute
end

.previous_line ⇒ Object 



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# File 'lib/cli/ui/ansi.rb', line 190

def previous_line
  previous_lines(1)
end

.previous_lines(n = 1) ⇒ Object 



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# File 'lib/cli/ui/ansi.rb', line 201

def previous_lines(n = 1)
  cursor_up(n) + cursor_horizontal_absolute
end

.printing_width(str) ⇒ Object 



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# File 'lib/cli/ui/ansi.rb', line 22

def printing_width(str)
  zwj = T.let(false, T::Boolean)
  strip_codes(str).codepoints.reduce(0) do |acc, cp|
    if zwj
      zwj = false
      next acc
    end
    case cp
    when 0x200d # zero-width joiner
      zwj = true
      acc
    when "\n"
      acc
    else
      acc + 1
    end
  end
end

.sgr(params) ⇒ Object 



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# File 'lib/cli/ui/ansi.rb', line 66

def sgr(params)
  control(params, 'm')
end

.show_cursor ⇒ Object 



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# File 'lib/cli/ui/ansi.rb', line 155

def show_cursor
  control('', '?25h')
end

.strip_codes(str) ⇒ Object 



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# File 'lib/cli/ui/ansi.rb', line 48

def strip_codes(str)
  str.gsub(/\x1b\[[\d;]+[A-Za-z]|\x1b\][\d;]+.*?\x1b\\|\r/, '')
end