Class: Reline::ANSI

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

Constant Summary collapse

RAW_KEYSTROKE_CONFIG = 
{
  [27, 91, 65] => :ed_prev_history,     # ↑
  [27, 91, 66] => :ed_next_history,     # ↓
  [27, 91, 67] => :ed_next_char,        # →
  [27, 91, 68] => :ed_prev_char,        # ←
  [27, 91, 51, 126] => :key_delete,     # Del
  [27, 91, 49, 126] => :ed_move_to_beg, # Home
  [27, 91, 52, 126] => :ed_move_to_end, # End
  [27, 91, 72] => :ed_move_to_beg,      # Home
  [27, 91, 70] => :ed_move_to_end,      # End
  [27, 32] => :em_set_mark,             # M-<space>
  [24, 24] => :em_exchange_mark,        # C-x C-x TODO also add Windows
  [27, 91, 49, 59, 53, 67] => :em_next_word, # Ctrl+→
  [27, 91, 49, 59, 53, 68] => :ed_prev_word, # Ctrl+←
}
@@input = 
STDIN
@@output = 
STDOUT
@@buf = 
[]
@@old_winch_handler = 
nil

Class Method Summary collapse

Class Method Details

.clear_screen ⇒ Object 



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# File 'lib/reline/ansi.rb', line 123

def self.clear_screen
  print "\e[2J"
  print "\e[1;1H"
end

.cursor_pos ⇒ Object 



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# File 'lib/reline/ansi.rb', line 69

def self.cursor_pos
  begin
    res = ''
    m = nil
    @@input.raw do |stdin|
      @@output << "\e[6n"
      @@output.flush
      while (c = stdin.getc) != 'R'
        res << c if c
      end
      m = res.match(/\e\[(?<row>\d+);(?<column>\d+)/)
      (m.pre_match + m.post_match).chars.reverse_each do |ch|
        stdin.ungetc ch
      end
    end
    column = m[:column].to_i - 1
    row = m[:row].to_i - 1
  rescue Errno::ENOTTY
    buf = @@output.pread(@@output.pos, 0)
    row = buf.count("\n")
    column = buf.rindex("\n") ? (buf.size - buf.rindex("\n")) - 1 : 0
  end
  Reline::CursorPos.new(column, row)
end

.deprep(otio) ⇒ Object 



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# File 'lib/reline/ansi.rb', line 140

def self.deprep(otio)
  int_handle = Signal.trap('INT', 'IGNORE')
  Signal.trap('INT', int_handle)
  Signal.trap('WINCH', @@old_winch_handler) if @@old_winch_handler
end

.erase_after_cursor ⇒ Object 



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# File 'lib/reline/ansi.rb', line 114

def self.erase_after_cursor
  print "\e[K"
end

.get_screen_size ⇒ Object 



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# File 'lib/reline/ansi.rb', line 52

def self.get_screen_size
  s = @@input.winsize
  return s if s[0] > 0 && s[1] > 0
  s = [ENV["LINES"].to_i, ENV["COLUMNS"].to_i]
  return s if s[0] > 0 && s[1] > 0
  [24, 80]
rescue Errno::ENOTTY
  [24, 80]
end

.getc ⇒ Object 



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# File 'lib/reline/ansi.rb', line 31

def self.getc
  unless @@buf.empty?
    return @@buf.shift
  end
  c = @@input.raw(intr: true, &:getbyte)
  (c == 0x16 && @@input.raw(min: 0, tim: 0, &:getbyte)) || c
end

.input=(val) ⇒ Object 



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# File 'lib/reline/ansi.rb', line 21

def self.input=(val)
  @@input = val
end

.move_cursor_column(x) ⇒ Object 



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# File 'lib/reline/ansi.rb', line 94

def self.move_cursor_column(x)
  print "\e[#{x + 1}G"
end

.move_cursor_down(x) ⇒ Object 



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# File 'lib/reline/ansi.rb', line 106

def self.move_cursor_down(x)
  if x > 0
    print "\e[#{x}B" if x > 0
  elsif x < 0
    move_cursor_up(-x)
  end
end

.move_cursor_up(x) ⇒ Object 



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# File 'lib/reline/ansi.rb', line 98

def self.move_cursor_up(x)
  if x > 0
    print "\e[#{x}A" if x > 0
  elsif x < 0
    move_cursor_down(-x)
  end
end

.output=(val) ⇒ Object 



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# File 'lib/reline/ansi.rb', line 26

def self.output=(val)
  @@output = val
end

.prep ⇒ Object 



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# File 'lib/reline/ansi.rb', line 133

def self.prep
  retrieve_keybuffer
  int_handle = Signal.trap('INT', 'IGNORE')
  Signal.trap('INT', int_handle)
  nil
end

.retrieve_keybuffer ⇒ Object 



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# File 'lib/reline/ansi.rb', line 43

def self.retrieve_keybuffer
    result = select([@@input], [], [], 0.001)
    return if result.nil?
    str = @@input.read_nonblock(1024)
    str.bytes.each do |c|
      @@buf.push(c)
    end
end

.scroll_down(x) ⇒ Object 



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# File 'lib/reline/ansi.rb', line 118

def self.scroll_down(x)
  return if x.zero?
  print "\e[#{x}S"
end

.set_screen_size(rows, columns) ⇒ Object 



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# File 'lib/reline/ansi.rb', line 62

def self.set_screen_size(rows, columns)
  @@input.winsize = [rows, columns]
  self
rescue Errno::ENOTTY
  self
end

.set_winch_handler(&handler) ⇒ Object 



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# File 'lib/reline/ansi.rb', line 129

def self.set_winch_handler(&handler)
  @@old_winch_handler = Signal.trap('WINCH', &handler)
end

.ungetc(c) ⇒ Object 



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# File 'lib/reline/ansi.rb', line 39

def self.ungetc(c)
  @@buf.unshift(c)
end