class Reline::ANSI
Constants
- ANSI_CURSOR_KEY_BINDINGS
- CAPNAME_KEY_BINDINGS
- END_BRACKETED_PASTE
- START_BRACKETED_PASTE
Public Class Methods
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# File lib/reline/io/ansi.rb, line 32 def initialize @input = STDIN @output = STDOUT @buf = [] @old_winch_handler = nil end
Public Instance Methods
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# File lib/reline/io/ansi.rb, line 234 def both_tty? @input.tty? && @output.tty? end
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# File lib/reline/io/ansi.rb, line 278 def clear_screen @output.write "\e[2J" @output.write "\e[1;1H" end
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# File lib/reline/io/ansi.rb, line 229 def cursor_pos col, row = cursor_pos_internal(timeout: 0.5) if both_tty? Reline::CursorPos.new(col || 0, row || 0) end
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# File lib/reline/io/ansi.rb, line 301 def deprep(otio) # Disable bracketed paste @output.write "\e[?2004l" if Reline.core.config.enable_bracketed_paste && both_tty? Signal.trap('WINCH', @old_winch_handler) if @old_winch_handler Signal.trap('CONT', @old_cont_handler) if @old_cont_handler end
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# File lib/reline/io/ansi.rb, line 169 def empty_buffer? unless @buf.empty? return false end !@input.wait_readable(0) end
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# File lib/reline/io/ansi.rb, line 39 def encoding @input.external_encoding || Encoding.default_external end
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# File lib/reline/io/ansi.rb, line 266 def erase_after_cursor @output.write "\e[K" end
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# File lib/reline/io/ansi.rb, line 191 def 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, Errno::ENODEV [24, 80] end
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# File lib/reline/io/ansi.rb, line 161 def getc(timeout_second) inner_getc(timeout_second) end
if the usage expects to wait indefinitely, use Float::INFINITY for timeout_second
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# File lib/reline/io/ansi.rb, line 258 def hide_cursor @output.write "\e[?25l" end
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# File lib/reline/io/ansi.rb, line 130 def inner_getc(timeout_second) unless @buf.empty? return @buf.shift end until @input.wait_readable(0.01) timeout_second -= 0.01 return nil if timeout_second <= 0 Reline.core.line_editor.handle_signal end c = @input.getbyte (c == 0x16 && @input.tty? && @input.raw(min: 0, time: 0, &:getbyte)) || c rescue Errno::EIO # Maybe the I/O has been closed. nil end
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# File lib/reline/io/ansi.rb, line 238 def move_cursor_column(x) @output.write "\e[#{x + 1}G" end
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# File lib/reline/io/ansi.rb, line 250 def move_cursor_down(x) if x > 0 @output.write "\e[#{x}B" elsif x < 0 move_cursor_up(-x) end end
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# File lib/reline/io/ansi.rb, line 242 def move_cursor_up(x) if x > 0 @output.write "\e[#{x}A" elsif x < 0 move_cursor_down(-x) end end
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# File lib/reline/io/ansi.rb, line 294 def prep # Enable bracketed paste @output.write "\e[?2004h" if Reline.core.config.enable_bracketed_paste && both_tty? retrieve_keybuffer nil end
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# File lib/reline/io/ansi.rb, line 149 def read_bracketed_paste buffer = String.new(encoding: Encoding::ASCII_8BIT) until buffer.end_with?(END_BRACKETED_PASTE) c = inner_getc(Float::INFINITY) break unless c buffer << c end string = buffer.delete_suffix(END_BRACKETED_PASTE).force_encoding(encoding) string.valid_encoding? ? string : '' end
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# File lib/reline/io/ansi.rb, line 180 def retrieve_keybuffer begin return unless @input.wait_readable(0.001) str = @input.read_nonblock(1024) str.bytes.each do |c| @buf.push(c) end rescue EOFError end end
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# File lib/reline/io/ansi.rb, line 272 def scroll_down(x) return if x.zero? # We use `\n` instead of CSI + S because CSI + S would cause https://github.com/ruby/reline/issues/576 @output.write "\n" * x end
This only works when the cursor is at the bottom of the scroll range For more details, see github.com/ruby/reline/pull/577#issuecomment-1646679623
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# File lib/reline/io/ansi.rb, line 62 def set_bracketed_paste_key_bindings(config) [:emacs, :vi_insert, :vi_command].each do |keymap| config.add_default_key_binding_by_keymap(keymap, START_BRACKETED_PASTE.bytes, :bracketed_paste_start) end end
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# File lib/reline/io/ansi.rb, line 43 def set_default_key_bindings(config) set_bracketed_paste_key_bindings(config) set_default_key_bindings_ansi_cursor(config) set_default_key_bindings_comprehensive_list(config) { [27, 91, 90] => :completion_journey_up, # S-Tab }.each_pair do |key, func| config.add_default_key_binding_by_keymap(:emacs, key, func) config.add_default_key_binding_by_keymap(:vi_insert, key, func) end { # default bindings [27, 32] => :em_set_mark, # M-<space> [24, 24] => :em_exchange_mark, # C-x C-x }.each_pair do |key, func| config.add_default_key_binding_by_keymap(:emacs, key, func) end end
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# File lib/reline/io/ansi.rb, line 68 def set_default_key_bindings_ansi_cursor(config) ANSI_CURSOR_KEY_BINDINGS.each do |char, (default_func, modifiers)| bindings = [ ["\e[#{char}", default_func], # CSI + char ["\eO#{char}", default_func] # SS3 + char, application cursor key mode ] if modifiers[:ctrl] # CSI + ctrl_key_modifier + char bindings << ["\e[1;5#{char}", modifiers[:ctrl]] end if modifiers[:meta] # CSI + meta_key_modifier + char bindings << ["\e[1;3#{char}", modifiers[:meta]] # Meta(ESC) + CSI + char bindings << ["\e\e[#{char}", modifiers[:meta]] end bindings.each do |sequence, func| key = sequence.bytes config.add_default_key_binding_by_keymap(:emacs, key, func) config.add_default_key_binding_by_keymap(:vi_insert, key, func) config.add_default_key_binding_by_keymap(:vi_command, key, func) end end end
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# File lib/reline/io/ansi.rb, line 93 def set_default_key_bindings_comprehensive_list(config) { # xterm [27, 91, 51, 126] => :key_delete, # kdch1 [27, 91, 53, 126] => :ed_search_prev_history, # kpp [27, 91, 54, 126] => :ed_search_next_history, # knp # Console (80x25) [27, 91, 49, 126] => :ed_move_to_beg, # Home [27, 91, 52, 126] => :ed_move_to_end, # End # urxvt / exoterm [27, 91, 55, 126] => :ed_move_to_beg, # Home [27, 91, 56, 126] => :ed_move_to_end, # End }.each_pair do |key, func| config.add_default_key_binding_by_keymap(:emacs, key, func) config.add_default_key_binding_by_keymap(:vi_insert, key, func) config.add_default_key_binding_by_keymap(:vi_command, key, func) end end
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# File lib/reline/io/ansi.rb, line 201 def set_screen_size(rows, columns) @input.winsize = [rows, columns] self rescue Errno::ENOTTY, Errno::ENODEV self end
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# File lib/reline/io/ansi.rb, line 283 def set_winch_handler(&handler) @old_winch_handler = Signal.trap('WINCH', &handler) @old_cont_handler = Signal.trap('CONT') do @input.raw!(intr: true) if @input.tty? # Rerender the screen. Note that screen size might be changed while suspended. handler.call end rescue ArgumentError # Signal.trap may raise an ArgumentError if the platform doesn't support the signal. end
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# File lib/reline/io/ansi.rb, line 262 def show_cursor @output.write "\e[?25h" end
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# File lib/reline/io/ansi.rb, line 122 def with_raw_input if @input.tty? @input.raw(intr: true) { yield } else yield end end
Private Instance Methods
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# File lib/reline/io/ansi.rb, line 208 def cursor_pos_internal(timeout:) match = nil @input.raw do |stdin| @output << "\e[6n" @output.flush timeout_at = Time.now + timeout buf = +'' while (wait = timeout_at - Time.now) > 0 && stdin.wait_readable(wait) buf << stdin.readpartial(1024) if (match = buf.match(/\e\[(?<row>\d+);(?<column>\d+)R/)) buf = match.pre_match + match.post_match break end end buf.chars.reverse_each do |ch| stdin.ungetc ch end end [match[:column].to_i - 1, match[:row].to_i - 1] if match end