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term: obtain the cursor position via termios.h (#11372)

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2021-09-06 14:24:39 +00:00
committed by GitHub
parent 78c26e69cf
commit af28d09630
19 changed files with 190 additions and 123 deletions
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64
vlib/readline/readline_linux.c.v
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@ -13,9 +13,32 @@ import os
#include <termios.h>
#include <sys/ioctl.h>
const cclen = 10
// Termios stores the terminal options on Linux.
struct C.termios {
mut:
c_iflag int
c_oflag int
c_cflag int
c_lflag int
c_line byte
c_cc [cclen]int
}
struct Termios {
mut:
c_iflag u32
c_oflag u32
c_cflag u32
c_lflag u32
c_line byte
c_cc [cclen]int
}
fn C.tcgetattr(fd int, termios_p &C.termios) int
fn C.tcsetattr(fd int, optional_actions int, termios_p &C.termios) int
fn C.tcsetattr(fd int, optional_actions int, const_termios_p &C.termios) int
fn C.raise(sig int)
@ -47,18 +70,22 @@ enum Action {
// Please note that `enable_raw_mode` catches the `SIGUSER` (CTRL + C) signal.
// For a method that does please see `enable_raw_mode_nosig`.
pub fn (mut r Readline) enable_raw_mode() {
if C.tcgetattr(0, unsafe { &C.termios(&r.orig_termios) }) == -1 {
if unsafe { C.tcgetattr(0, &C.termios(&r.orig_termios)) } != 0 {
r.is_tty = false
r.is_raw = false
return
}
mut raw := r.orig_termios
mut raw := C.termios{}
unsafe { vmemcpy(&raw, &r.orig_termios, int(sizeof(raw))) }
// println('> r.orig_termios: $r.orig_termios')
// println('> raw: $raw')
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, unsafe { &C.termios(&raw) })
raw.c_cc[C.VMIN] = byte(1)
raw.c_cc[C.VTIME] = byte(0)
unsafe { C.tcsetattr(0, C.TCSADRAIN, &raw) }
// println('> after raw: $raw')
r.is_raw = true
r.is_tty = true
}
@ -68,18 +95,19 @@ pub fn (mut r Readline) enable_raw_mode() {
// Please note that `enable_raw_mode_nosig` does not catch the `SIGUSER` (CTRL + C) signal
// as opposed to `enable_raw_mode`.
pub fn (mut r Readline) enable_raw_mode_nosig() {
if C.tcgetattr(0, unsafe { &C.termios(&r.orig_termios) }) == -1 {
if unsafe { C.tcgetattr(0, &C.termios(&r.orig_termios)) } != 0 {
r.is_tty = false
r.is_raw = false
return
}
mut raw := r.orig_termios
mut raw := C.termios{}
unsafe { vmemcpy(&raw, &r.orig_termios, int(sizeof(raw))) }
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, unsafe { &C.termios(&raw) })
raw.c_cc[C.VMIN] = byte(1)
raw.c_cc[C.VTIME] = byte(0)
unsafe { C.tcsetattr(0, C.TCSADRAIN, &raw) }
r.is_raw = true
r.is_tty = true
}
@ -88,7 +116,7 @@ pub fn (mut r Readline) enable_raw_mode_nosig() {
// For a description of raw mode please see the `enable_raw_mode` method.
pub fn (mut r Readline) disable_raw_mode() {
if r.is_raw {
C.tcsetattr(0, C.TCSADRAIN, unsafe { &C.termios(&r.orig_termios) })
unsafe { C.tcsetattr(0, C.TCSADRAIN, &C.termios(&r.orig_termios)) }
r.is_raw = false
}
}
@ -122,7 +150,7 @@ pub fn (mut r Readline) read_line_utf8(prompt string) ?[]rune {
}
print(r.prompt)
for {
C.fflush(C.stdout)
unsafe { C.fflush(C.stdout) }
c := r.read_char()
a := r.analyse(c)
if r.execute(a, c) {
@ -311,7 +339,7 @@ fn (mut r Readline) execute(a Action, c int) bool {
// get_screen_columns returns the number of columns (`width`) in the terminal.
fn get_screen_columns() int {
ws := Winsize{}
cols := if C.ioctl(1, C.TIOCGWINSZ, &ws) == -1 { 80 } else { int(ws.ws_col) }
cols := if unsafe { C.ioctl(1, C.TIOCGWINSZ, &ws) } == -1 { 80 } else { int(ws.ws_col) }
return cols
}
@ -542,10 +570,12 @@ fn (mut r Readline) suspend() {
r.disable_raw_mode()
if !is_standalone {
// We have to SIGSTOP the parent v process
ppid := C.getppid()
C.kill(ppid, C.SIGSTOP)
unsafe {
ppid := C.getppid()
C.kill(ppid, C.SIGSTOP)
}
}
C.raise(C.SIGSTOP)
unsafe { C.raise(C.SIGSTOP) }
r.enable_raw_mode()
r.refresh_line()
if r.is_tty {