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require 'io/console'
require 'io/wait'
class Reline::ANSI < Reline::IO
CAPNAME_KEY_BINDINGS = {
'khome' => :ed_move_to_beg,
'kend' => :ed_move_to_end,
'kdch1' => :key_delete,
'kpp' => :ed_search_prev_history,
'knp' => :ed_search_next_history,
'kcuu1' => :ed_prev_history,
'kcud1' => :ed_next_history,
'kcuf1' => :ed_next_char,
'kcub1' => :ed_prev_char,
}
ANSI_CURSOR_KEY_BINDINGS = {
# Up
'A' => [:ed_prev_history, {}],
# Down
'B' => [:ed_next_history, {}],
# Right
'C' => [:ed_next_char, { ctrl: :em_next_word, meta: :em_next_word }],
# Left
'D' => [:ed_prev_char, { ctrl: :ed_prev_word, meta: :ed_prev_word }],
# End
'F' => [:ed_move_to_end, {}],
# Home
'H' => [:ed_move_to_beg, {}],
}
attr_writer :input, :output
def initialize
@input = STDIN
@output = STDOUT
@buf = []
@output_buffer = nil
@old_winch_handler = nil
end
def encoding
@input.external_encoding || Encoding.default_external
rescue IOError
# STDIN.external_encoding raises IOError in Ruby <= 3.0 when STDIN is closed
Encoding.default_external
end
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
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
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
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
def with_raw_input
if @input.tty?
@input.raw(intr: true) { yield }
else
yield
end
end
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
START_BRACKETED_PASTE = String.new("\e[200~", encoding: Encoding::ASCII_8BIT)
END_BRACKETED_PASTE = String.new("\e[201~", encoding: Encoding::ASCII_8BIT)
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
# if the usage expects to wait indefinitely, use Float::INFINITY for timeout_second
def getc(timeout_second)
inner_getc(timeout_second)
end
def in_pasting?
not empty_buffer?
end
def empty_buffer?
unless @buf.empty?
return false
end
!@input.wait_readable(0)
end
def ungetc(c)
@buf.unshift(c)
end
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
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
def set_screen_size(rows, columns)
@input.winsize = [rows, columns]
self
rescue Errno::ENOTTY, Errno::ENODEV
self
end
private 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
def cursor_pos
col, row = cursor_pos_internal(timeout: 0.5) if both_tty?
Reline::CursorPos.new(col || 0, row || 0)
end
def both_tty?
@input.tty? && @output.tty?
end
def write(string)
if @output_buffer
@output_buffer << string
else
@output.write(string)
end
end
def buffered_output
@output_buffer = +''
yield
@output.write(@output_buffer)
ensure
@output_buffer = nil
end
def move_cursor_column(x)
write "\e[#{x + 1}G"
end
def move_cursor_up(x)
if x > 0
write "\e[#{x}A"
elsif x < 0
move_cursor_down(-x)
end
end
def move_cursor_down(x)
if x > 0
write "\e[#{x}B"
elsif x < 0
move_cursor_up(-x)
end
end
def hide_cursor
write "\e[?25l"
end
def show_cursor
write "\e[?25h"
end
def erase_after_cursor
write "\e[K"
end
# This only works when the cursor is at the bottom of the scroll range
# For more details, see https://github.com/ruby/reline/pull/577#issuecomment-1646679623
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
write "\n" * x
end
def clear_screen
write "\e[2J"
write "\e[1;1H"
end
def set_winch_handler(&handler)
@old_winch_handler = Signal.trap('WINCH') do |arg|
handler.call
@old_winch_handler.call(arg) if @old_winch_handler.respond_to?(:call)
end
@old_cont_handler = Signal.trap('CONT') do |arg|
@input.raw!(intr: true) if @input.tty?
# Rerender the screen. Note that screen size might be changed while suspended.
handler.call
@old_cont_handler.call(arg) if @old_cont_handler.respond_to?(:call)
end
rescue ArgumentError
# Signal.trap may raise an ArgumentError if the platform doesn't support the signal.
end
def prep
# Enable bracketed paste
write "\e[?2004h" if Reline.core.config.enable_bracketed_paste && both_tty?
retrieve_keybuffer
nil
end
def deprep(otio)
# Disable bracketed paste
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
end