1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
|
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
[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
}
@@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
@@input.getbyte
end
def self.ungetc(c)
@@buf.unshift(c)
end
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
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
@@old_winch_handler = nil
def self.set_winch_handler(&handler)
@@old_winch_handler = Signal.trap('WINCH', &handler)
end
def self.prep
retrieve_keybuffer
int_handle = Signal.trap('INT', 'IGNORE')
otio = `stty -g`.chomp
setting = ' -echo -icrnl cbreak'
stty = `stty -a`
if /-parenb\b/ =~ stty
setting << ' pass8'
end
if /\bdsusp *=/ =~ stty
setting << ' dsusp undef'
end
setting << ' -ixoff'
`stty #{setting}`
Signal.trap('INT', int_handle)
otio
end
def self.deprep(otio)
int_handle = Signal.trap('INT', 'IGNORE')
system("stty #{otio}", err: File::NULL)
Signal.trap('INT', int_handle)
Signal.trap('WINCH', @@old_winch_handler) if @@old_winch_handler
end
end
|