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105 lines
2.4 KiB
V
105 lines
2.4 KiB
V
// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
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// Use of this source code is governed by an MIT license
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// that can be found in the LICENSE file.
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// Linux version
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// Will serve as more advanced input method
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// Based on the work of https://github.com/AmokHuginnsson/replxx
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module readline
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#include <termios.h>
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struct termios {
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mut:
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c_iflag int
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c_oflag int
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c_cflag int
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c_lflag int
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c_cc [12]int //NCCS == 12. Cant use the defined value here
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}
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struct Readline {
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pub mut:
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is_raw bool
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orig_termios termios
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}
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// Toggle raw mode of the terminal by changing its attributes
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pub fn (r mut Readline) enable_raw_mode() {
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if ( C.tcgetattr(0, &r.orig_termios) == -1 ) {
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panic('No tty')
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}
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mut raw := r.orig_termios
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raw.c_iflag &= ~( C.BRKINT | C.ICRNL | C.INPCK | C.ISTRIP | C.IXON )
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raw.c_cflag |= ( C.CS8 )
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raw.c_lflag &= ~( C.ECHO | C.ICANON | C.IEXTEN | C.ISIG )
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raw.c_cc[C.VMIN] = 1
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raw.c_cc[C.VTIME] = 0
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C.tcsetattr(0, C.TCSADRAIN, &raw)
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r.is_raw = true
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}
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// Not catching the SIGUSER (CTRL+C) Signal
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pub fn (r Readline) enable_raw_mode2() {
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if ( C.tcgetattr(0, &r.orig_termios) == -1 ) {
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panic('No tty')
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}
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mut raw := r.orig_termios
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raw.c_iflag &= ~( C.BRKINT | C.ICRNL | C.INPCK | C.ISTRIP | C.IXON )
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raw.c_cflag |= ( C.CS8 )
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raw.c_lflag &= ~( C.ECHO | C.ICANON | C.IEXTEN )
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raw.c_cc[C.VMIN] = 1
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raw.c_cc[C.VTIME] = 0
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C.tcsetattr(0, C.TCSADRAIN, &raw)
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}
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// Reset back the terminal to its default value
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pub fn (r Readline) disable_raw_mode() {
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if r.is_raw {
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C.tcsetattr(0, C.TCSADRAIN, &r.orig_termios)
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}
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}
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// Read single char
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fn (r Readline) read_char() byte {
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return C.getchar()
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}
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// Delete character in the string and in the terminal
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fn (r Readline) delete_character(s string, cursor int) string {
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print('\b \b')
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return s.left(cursor - 1) + s.right(cursor)
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}
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pub fn (r Readline) read_line() string {
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mut s := ''
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mut cursor := 0
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for {
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c := r.read_char()
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// Check if ending string
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if c == `\0` || c == 0x3 || c == 0x4 || c == 255 {
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break
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}
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// Check if backspace
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if c == `\b` || c == 127 {
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if cursor > 0 {
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s = r.delete_character(s, cursor)
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cursor--
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}
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} else {
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// Add new character according to cursor position
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s = s.left(cursor) + c.str() + s.right(cursor)
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cursor++
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}
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// Check if enter
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if c == `\n` || c == `\r` {
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println('')
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break
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} else {
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print(c.str())
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}
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}
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return s
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} |