415 lines
10 KiB
V
415 lines
10 KiB
V
// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
|
|
// Use of this source code is governed by an MIT license
|
|
// that can be found in the LICENSE file.
|
|
|
|
// Linux version
|
|
// Will serve as more advanced input method
|
|
// Based on the work of https://github.com/AmokHuginnsson/replxx
|
|
|
|
module readline
|
|
|
|
import term
|
|
|
|
#include <termios.h>
|
|
#include <sys/ioctl.h>
|
|
|
|
// Used to change the terminal options
|
|
struct termios {
|
|
mut:
|
|
c_iflag int
|
|
c_oflag int
|
|
c_cflag int
|
|
c_lflag int
|
|
c_cc [12]int //NCCS == 12. Cant use the defined value here
|
|
}
|
|
|
|
// Used to collect the screen information
|
|
struct winsize {
|
|
ws_row u16
|
|
ws_col u16
|
|
ws_xpixel u16
|
|
ws_ypixel u16
|
|
}
|
|
|
|
struct Readline {
|
|
mut:
|
|
is_raw bool
|
|
orig_termios termios
|
|
current string // Line being edited
|
|
cursor int // Cursor position
|
|
overwrite bool
|
|
cursor_row_offset int
|
|
prompt string
|
|
previous_lines []string
|
|
search_index int
|
|
}
|
|
|
|
|
|
// Defines actions to execute
|
|
enum Action {
|
|
eof
|
|
nothing
|
|
insert_character
|
|
commit_line
|
|
delete_left
|
|
delete_right
|
|
move_cursor_left
|
|
move_cursor_right
|
|
move_cursor_begining
|
|
move_cursor_end
|
|
move_cursor_word_left
|
|
move_cursor_word_right
|
|
history_previous
|
|
history_next
|
|
overwrite
|
|
clear_screen
|
|
suspend
|
|
}
|
|
|
|
// Toggle raw mode of the terminal by changing its attributes
|
|
pub fn (r mut Readline) enable_raw_mode() {
|
|
if ( C.tcgetattr(0, &r.orig_termios) == -1 ) {
|
|
panic('No tty')
|
|
}
|
|
mut raw := r.orig_termios
|
|
raw.c_iflag &= ~( C.BRKINT | C.ICRNL | C.INPCK | C.ISTRIP | C.IXON )
|
|
raw.c_cflag |= ( C.CS8 )
|
|
raw.c_lflag &= ~( C.ECHO | C.ICANON | C.IEXTEN | C.ISIG )
|
|
raw.c_cc[C.VMIN] = 1
|
|
raw.c_cc[C.VTIME] = 0
|
|
C.tcsetattr(0, C.TCSADRAIN, &raw)
|
|
r.is_raw = true
|
|
}
|
|
|
|
// Not catching the SIGUSER (CTRL+C) Signal
|
|
pub fn (r Readline) enable_raw_mode2() {
|
|
if ( C.tcgetattr(0, &r.orig_termios) == -1 ) {
|
|
panic('No tty')
|
|
}
|
|
mut raw := r.orig_termios
|
|
raw.c_iflag &= ~( C.BRKINT | C.ICRNL | C.INPCK | C.ISTRIP | C.IXON )
|
|
raw.c_cflag |= ( C.CS8 )
|
|
raw.c_lflag &= ~( C.ECHO | C.ICANON | C.IEXTEN )
|
|
raw.c_cc[C.VMIN] = 1
|
|
raw.c_cc[C.VTIME] = 0
|
|
C.tcsetattr(0, C.TCSADRAIN, &raw)
|
|
}
|
|
|
|
// Reset back the terminal to its default value
|
|
pub fn (r Readline) disable_raw_mode() {
|
|
if r.is_raw {
|
|
C.tcsetattr(0, C.TCSADRAIN, &r.orig_termios)
|
|
}
|
|
}
|
|
|
|
// Read single char
|
|
// TODO: Maybe handle UNICODE
|
|
fn (r Readline) read_char() byte {
|
|
return C.getchar()
|
|
}
|
|
|
|
// Main function of the readline module
|
|
// Will loop and ingest characters until EOF or Enter
|
|
// Returns the completed line
|
|
pub fn (r mut Readline) read_line(prompt string) string {
|
|
r.current = ''
|
|
r.cursor = 0
|
|
r.prompt = prompt
|
|
r.search_index = 0
|
|
if r.previous_lines.len <= 1 {
|
|
r.previous_lines << ''
|
|
r.previous_lines << ''
|
|
}
|
|
else {
|
|
r.previous_lines[0] = ''
|
|
}
|
|
|
|
print(r.prompt)
|
|
for {
|
|
c := r.read_char()
|
|
a := r.analyse(c)
|
|
if r.execute(a, c) {
|
|
break
|
|
}
|
|
}
|
|
r.previous_lines[0] = ''
|
|
r.search_index = 0
|
|
return r.current
|
|
}
|
|
|
|
fn (r Readline) analyse(c byte) Action {
|
|
switch c {
|
|
case `\0`: return Action.eof
|
|
case 0x3 : return Action.eof // End of Text
|
|
case 0x4 : return Action.eof // End of Transmission
|
|
case 255 : return Action.eof
|
|
case `\n`: return Action.commit_line
|
|
case `\r`: return Action.commit_line
|
|
case `\f`: return Action.clear_screen // CTRL + L
|
|
case `\b`: return Action.delete_left // Backspace
|
|
case 127 : return Action.delete_left // DEL
|
|
case 27 : return r.analyse_control() // ESC
|
|
case 1 : return Action.move_cursor_begining // ^A
|
|
case 5 : return Action.move_cursor_end // ^E
|
|
case 26 : return Action.suspend // CTRL + Z, SUB
|
|
default : return if c >= ` ` { Action.insert_character } else { Action.nothing }
|
|
}
|
|
}
|
|
|
|
fn (r Readline) analyse_control() Action {
|
|
c := r.read_char()
|
|
switch c {
|
|
case `[`:
|
|
sequence := r.read_char()
|
|
switch sequence {
|
|
case `C`: return Action.move_cursor_right
|
|
case `D`: return Action.move_cursor_left
|
|
case `B`: return Action.history_next
|
|
case `A`: return Action.history_previous
|
|
case `1`: return r.analyse_extended_control()
|
|
case `2`: return r.analyse_extended_control_no_eat(sequence)
|
|
case `3`: return r.analyse_extended_control_no_eat(sequence)
|
|
}
|
|
}
|
|
return Action.nothing
|
|
}
|
|
|
|
fn (r Readline) analyse_extended_control() Action {
|
|
r.read_char() // Removes ;
|
|
c := r.read_char()
|
|
switch c {
|
|
case `5`:
|
|
direction := r.read_char()
|
|
switch direction {
|
|
case `C`: return Action.move_cursor_word_right
|
|
case `D`: return Action.move_cursor_word_left
|
|
}
|
|
}
|
|
return Action.nothing
|
|
}
|
|
|
|
fn (r Readline) analyse_extended_control_no_eat(last_c byte) Action {
|
|
c := r.read_char()
|
|
switch c {
|
|
case `~`:
|
|
switch last_c {
|
|
case `3`: return Action.delete_right // Suppr key
|
|
case `2`: return Action.overwrite
|
|
}
|
|
}
|
|
return Action.nothing
|
|
}
|
|
|
|
fn (r mut Readline) execute(a Action, c byte) bool {
|
|
switch a {
|
|
case Action.eof: return r.eof()
|
|
case Action.insert_character: r.insert_character(c)
|
|
case Action.commit_line: return r.commit_line()
|
|
case Action.delete_left: r.delete_character()
|
|
case Action.delete_right: r.suppr_character()
|
|
case Action.move_cursor_left: r.move_cursor_left()
|
|
case Action.move_cursor_right: r.move_cursor_right()
|
|
case Action.move_cursor_begining: r.move_cursor_begining()
|
|
case Action.move_cursor_end: r.move_cursor_end()
|
|
case Action.move_cursor_word_left: r.move_cursor_word_left()
|
|
case Action.move_cursor_word_right: r.move_cursor_word_right()
|
|
case Action.history_previous: r.history_previous()
|
|
case Action.history_next: r.history_next()
|
|
case Action.overwrite: r.switch_overwrite()
|
|
case Action.clear_screen: r.clear_screen()
|
|
case Action.suspend: r.suspend()
|
|
}
|
|
return false
|
|
}
|
|
|
|
fn get_screen_columns() int {
|
|
ws := winsize{}
|
|
cols := if C.ioctl(1, C.TIOCGWINSZ, &ws) == -1 { 80 } else { ws.ws_col }
|
|
return int(cols)
|
|
}
|
|
|
|
fn shift_cursor(xpos int, yoffset int) {
|
|
if yoffset != 0 {
|
|
if yoffset > 0 {
|
|
term.cursor_down(yoffset)
|
|
}
|
|
else {
|
|
term.cursor_up(- yoffset)
|
|
}
|
|
}
|
|
// Absolute X position
|
|
print('\x1b[${xpos + 1}G')
|
|
}
|
|
|
|
fn calculate_screen_position(x_in int, y_in int, screen_columns int, char_count int, out mut []int) {
|
|
mut x := x_in
|
|
mut y := y_in
|
|
out[0] = x
|
|
out[1] = y
|
|
for chars_remaining := char_count; chars_remaining > 0; {
|
|
chars_this_row := if ( (x + chars_remaining) < screen_columns) { chars_remaining } else { screen_columns - x }
|
|
out[0] = x + chars_this_row
|
|
out[1] = y
|
|
chars_remaining -= chars_this_row
|
|
x = 0
|
|
y++
|
|
}
|
|
if out[0] == screen_columns {
|
|
out[0] = 0
|
|
out[1]++
|
|
}
|
|
}
|
|
|
|
// Will redraw the line
|
|
// TODO: Fix if prompt is longer than terminal columns
|
|
fn (r mut Readline) refresh_line() {
|
|
mut end_of_input := [0, 0]
|
|
calculate_screen_position(r.prompt.len, 0, get_screen_columns(), r.current.len, mut end_of_input)
|
|
end_of_input[1] += r.current.count('\n')
|
|
mut cursor_pos := [0, 0]
|
|
calculate_screen_position(r.prompt.len, 0, get_screen_columns(), r.cursor, mut cursor_pos)
|
|
|
|
shift_cursor(0, -r.cursor_row_offset)
|
|
term.erase_toend()
|
|
print(r.prompt)
|
|
print(r.current)
|
|
if end_of_input[0] == 0 && end_of_input[1] > 0 {
|
|
print('\n')
|
|
}
|
|
shift_cursor(cursor_pos[0], - (end_of_input[1] - cursor_pos[1]))
|
|
r.cursor_row_offset = cursor_pos[1]
|
|
}
|
|
|
|
// End the line without a newline
|
|
fn (r mut Readline) eof() bool {
|
|
r.previous_lines.insert(1, r.current)
|
|
return true
|
|
}
|
|
|
|
fn (r mut Readline) insert_character(c byte) {
|
|
// Small ASCII, to expand
|
|
if c >= 127 {
|
|
return
|
|
}
|
|
// TODO: Add character if overwrite at end
|
|
if !r.overwrite || r.cursor == r.current.len {
|
|
r.current = r.current.left(r.cursor) + c.str() + r.current.right(r.cursor)
|
|
} else {
|
|
r.current = r.current.left(r.cursor) + c.str() + r.current.right(r.cursor + 1)
|
|
}
|
|
r.cursor++
|
|
// Refresh the line to add the new character
|
|
r.refresh_line()
|
|
}
|
|
|
|
// Removes the character behind cursor.
|
|
fn (r mut Readline) delete_character() {
|
|
if r.cursor <= 0 {
|
|
return
|
|
}
|
|
r.cursor--
|
|
r.current = r.current.left(r.cursor) + r.current.right(r.cursor + 1)
|
|
r.refresh_line()
|
|
}
|
|
|
|
// Removes the character in front of cursor.
|
|
fn (r mut Readline) suppr_character() {
|
|
if r.cursor > r.current.len {
|
|
return
|
|
}
|
|
r.current = r.current.left(r.cursor) + r.current.right(r.cursor + 1)
|
|
r.refresh_line()
|
|
}
|
|
|
|
// Add a line break then stops the main loop
|
|
fn (r mut Readline) commit_line() bool {
|
|
r.previous_lines.insert(1, r.current)
|
|
r.current = r.current + '\n'
|
|
println('')
|
|
return true
|
|
}
|
|
|
|
fn (r mut Readline) move_cursor_left() {
|
|
if r.cursor > 0 {
|
|
r.cursor--
|
|
r.refresh_line()
|
|
}
|
|
}
|
|
|
|
fn (r mut Readline) move_cursor_right() {
|
|
if r.cursor < r.current.len {
|
|
r.cursor++
|
|
r.refresh_line()
|
|
}
|
|
}
|
|
|
|
fn (r mut Readline) move_cursor_begining() {
|
|
r.cursor = 0
|
|
r.refresh_line()
|
|
}
|
|
|
|
fn (r mut Readline) move_cursor_end() {
|
|
r.cursor = r.current.len
|
|
r.refresh_line()
|
|
}
|
|
|
|
// Check if the character is considered as a word-breaking character
|
|
fn (r Readline) is_break_character(c byte) bool {
|
|
break_characters := ' \t\v\f\a\b\r\n`~!@#$%^&*()-=+[{]}\\|;:\'",<.>/?'
|
|
return break_characters.contains(c.str())
|
|
}
|
|
|
|
fn (r mut Readline) move_cursor_word_left() {
|
|
if r.cursor > 0 {
|
|
for ; r.cursor > 0 && r.is_break_character(r.current[r.cursor - 1]); r.cursor-- {}
|
|
for ; r.cursor > 0 && !r.is_break_character(r.current[r.cursor - 1]); r.cursor-- {}
|
|
r.refresh_line()
|
|
}
|
|
}
|
|
|
|
fn (r mut Readline) move_cursor_word_right() {
|
|
if r.cursor < r.current.len {
|
|
for ; r.cursor < r.current.len && r.is_break_character(r.current[r.cursor]); r.cursor++ {}
|
|
for ; r.cursor < r.current.len && !r.is_break_character(r.current[r.cursor]); r.cursor++ {}
|
|
r.refresh_line()
|
|
}
|
|
}
|
|
|
|
fn (r mut Readline) switch_overwrite() {
|
|
r.overwrite = !r.overwrite
|
|
}
|
|
|
|
fn (r mut Readline) clear_screen() {
|
|
term.set_cursor_position(1, 1)
|
|
term.erase_clear()
|
|
r.refresh_line()
|
|
}
|
|
|
|
fn (r mut Readline) history_previous() {
|
|
if r.search_index + 2 >= r.previous_lines.len {
|
|
return
|
|
}
|
|
if r.search_index == 0 {
|
|
r.previous_lines[0] = r.current
|
|
}
|
|
r.search_index++
|
|
r.current = r.previous_lines[r.search_index]
|
|
r.cursor = r.current.len
|
|
r.refresh_line()
|
|
}
|
|
|
|
fn (r mut Readline) history_next() {
|
|
if r.search_index <= 0 {
|
|
return
|
|
}
|
|
r.search_index--
|
|
r.current = r.previous_lines[r.search_index]
|
|
r.cursor = r.current.len
|
|
r.refresh_line()
|
|
}
|
|
|
|
fn (r mut Readline) suspend() {
|
|
C.raise(C.SIGSTOP)
|
|
r.refresh_line()
|
|
}
|