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class Reline::ANSI
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
}.each_key(&:freeze).freeze
@@input = STDIN
def self.input=(val)
@@input = val
end
@@output = STDOUT
def self.output=(val)
@@output = val
end
@@buf = []
def self.getc
unless @@buf.empty?
return @@buf.shift
end
c = nil
loop do
result = select([@@input], [], [], 0.1)
next if result.nil?
c = @@input.read(1)
break
end
c&.ord
end
def self.ungetc(c)
@@buf.unshift(c)
end
def self.get_screen_size
@@input.winsize
rescue Errno::ENOTTY
[24, 80]
end
def self.set_screen_size(rows, columns)
@@input.winsize = [rows, columns]
self
rescue Errno::ENOTTY
self
end
def self.cursor_pos
begin
res = ''
@@input.raw do |stdin|
@@output << "\e[6n"
@@output.flush
while (c = stdin.getc) != 'R'
res << c if c
end
end
m = res.match(/(?<row>\d+);(?<column>\d+)/)
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
def self.move_cursor_column(x)
print "\e[#{x + 1}G"
end
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
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
def self.erase_after_cursor
print "\e[K"
end
def self.scroll_down(x)
return if x.zero?
print "\e[#{x}S"
end
def self.clear_screen
print "\e[2J"
print "\e[1;1H"
end
def self.prep
int_handle = Signal.trap('INT', 'IGNORE')
otio = `stty -g`.chomp
setting = ' -echo -icrnl cbreak'
if /-parenb\b/ =~ `stty -a`
setting << ' pass8'
end
setting << ' -ixoff'
`stty #{setting}`
Signal.trap('INT', int_handle)
otio
end
def self.deprep(otio)
int_handle = Signal.trap('INT', 'IGNORE')
`stty #{otio}`
Signal.trap('INT', int_handle)
end
end
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