/* This function is the core of the line editing capability of linenoise.
* It expects 'fd' to be already in "raw mode" so that every key pressed
* will be returned ASAP to read().
*
* The resulting string is put into 'buf' when the user type enter, or
* when ctrl+d is typed.
*
* The function returns the length of the current buffer. */
static int linenoiseEdit(int stdin_fd, int stdout_fd, char *buf, size_t buflen, char *prompt)
{
struct linenoiseState l;
/* Populate the linenoise state that we pass to functions implementing
* specific editing functionalities. */
l.ifd = stdin_fd;
l.ofd = stdout_fd;
l.buf = buf;
l.buflen = buflen;
l.prompt = prompt;
l.plen = strlen(prompt);
l.oldpos = l.pos = 0;
l.len = 0;
l.cols = getColumns(stdin_fd, stdout_fd);
l.maxrows = 0;
l.history_index = 0;
/* Buffer starts empty. */
l.buf[0] = '\0';
l.buflen--; /* Make sure there is always space for the nulterm */
/* The latest history entry is always our current buffer, that
* initially is just an empty string. */
linenoiseHistoryAdd("");
if (write(l.ofd,prompt,l.plen) == -1) return -1;
while(1) {
char c;
int nread;
char seq[3];
nread = read(l.ifd,&c,1);
if (nread <= 0) return l.len;
/* Only autocomplete when the callback is set. It returns < 0 when
* there was an error reading from fd. Otherwise it will return the
* character that should be handled next. */
if (c == 9 && completionCallback != NULL) {
c = completeLine(&l);
/* Return on errors */
if (c < 0) return l.len;
/* Read next character when 0 */
if (c == 0) continue;
}
switch(c) {
case ENTER: /* enter */
history_len--;
free(history[history_len]);
if (mlmode) linenoiseEditMoveEnd(&l);
return (int)l.len;
case CTRL_C: /* ctrl-c */
errno = EAGAIN;
return -1;
case BACKSPACE: /* backspace */
case 8: /* ctrl-h */
linenoiseEditBackspace(&l);
break;
case CTRL_D: /* ctrl-d, remove char at right of cursor, or if the
line is empty, act as end-of-file. */
if (l.len > 0) {
linenoiseEditDelete(&l);
} else {
history_len--;
free(history[history_len]);
return -1;
}
break;
case CTRL_T: /* ctrl-t, swaps current character with previous. */
if (l.pos > 0 && l.pos < l.len) {
int aux = buf[l.pos-1];
buf[l.pos-1] = buf[l.pos];
buf[l.pos] = aux;
if (l.pos != l.len-1) l.pos++;
refreshLine(&l);
}
break;
case CTRL_B: /* ctrl-b */
linenoiseEditMoveLeft(&l);
break;
case CTRL_F: /* ctrl-f */
linenoiseEditMoveRight(&l);
break;
case CTRL_P: /* ctrl-p */
linenoiseEditHistoryNext(&l, LINENOISE_HISTORY_PREV);
break;
case CTRL_N: /* ctrl-n */
linenoiseEditHistoryNext(&l, LINENOISE_HISTORY_NEXT);
break;
case ESC: /* escape sequence */
/* Read the next two bytes representing the escape sequence.
* Use two calls to handle slow terminals returning the two
* chars at different times. */
if (read(l.ifd,seq,1) == -1) break;
if (read(l.ifd,seq+1,1) == -1) break;
/* ESC [ sequences. */
if (seq[0] == '[') {
if (seq[1] >= '0' && seq[1] <= '9') {
/* Extended escape, read additional byte. */
if (read(l.ifd,seq+2,1) == -1) break;
if (seq[2] == '~') {
switch(seq[1]) {
case '3': /* Delete key. */
linenoiseEditDelete(&l);
break;
}
}
} else {
switch(seq[1]) {
case 'A': /* Up */
linenoiseEditHistoryNext(&l, LINENOISE_HISTORY_PREV);
break;
case 'B': /* Down */
linenoiseEditHistoryNext(&l, LINENOISE_HISTORY_NEXT);
break;
case 'C': /* Right */
linenoiseEditMoveRight(&l);
break;
case 'D': /* Left */
linenoiseEditMoveLeft(&l);
break;
case 'H': /* Home */
linenoiseEditMoveHome(&l);
break;
case 'F': /* End*/
linenoiseEditMoveEnd(&l);
break;
}
}
}
/* ESC O sequences. */
else if (seq[0] == 'O') {
switch(seq[1]) {
case 'H': /* Home */
linenoiseEditMoveHome(&l);
break;
case 'F': /* End*/
linenoiseEditMoveEnd(&l);
break;
}
}
break;
default:
if (linenoiseEditInsert(&l,c)) return -1;
break;
case CTRL_U: /* Ctrl+u, delete the whole line. */
buf[0] = '\0';
l.pos = l.len = 0;
refreshLine(&l);
break;
case CTRL_K: /* Ctrl+k, delete from current to end of line. */
buf[l.pos] = '\0';
l.len = l.pos;
refreshLine(&l);
break;
case CTRL_A: /* Ctrl+a, go to the start of the line */
linenoiseEditMoveHome(&l);
break;
case CTRL_E: /* ctrl+e, go to the end of the line */
linenoiseEditMoveEnd(&l);
break;
case CTRL_L: /* ctrl+l, clear screen */
linenoiseClearScreen();
refreshLine(&l);
break;
case CTRL_W: /* ctrl+w, delete previous word */
linenoiseEditDeletePrevWord(&l);
break;
}
}
return l.len;
}
static int linenoiseEdit(char *buf, size_t buflen, const char *prompt)
{
struct linenoiseState l = {
.buf = buf, .buflen = buflen,
.prompt = prompt, .plen = strlen(prompt),
.oldpos = 0, .pos = 0,
.len = 0,
.cols = 80, .maxrows = 0,
.history_index = 0,
};
/* Buffer starts empty. */
buf[0] = '\0';
buflen--; /* Make sure there is always space for the nulterm */
/* The latest history entry is always our current buffer, that
* initially is just an empty string. */
linenoiseHistoryAdd("");
serial.puts(prompt);
while (1) {
char c;
char seq[2] = {0};
c = serial.getc();
/* Only autocomplete when the callback is set. */
if (c == 9 && completionCallback != NULL) {
c = completeLine(&l);
/* Return on errors */
if (c < 0) return l.len;
/* Read next character when 0 */
if (c == 0) continue;
}
switch (c) {
case ENTER: /* enter */
history_len--;
free(history[history_len]);
return (int)l.len;
case CTRL_C:
return -1;
case BACKSPACE: /* backspace */
case CTRL_H: /* ctrl-h */
linenoiseEditBackspace(&l);
break;
case CTRL_D: /* ctrl-d, remove char at right of cursor, or of the
line is empty, act as end-of-file. */
if (l.len > 0) {
linenoiseEditDelete(&l);
} else {
history_len--;
free(history[history_len]);
return -1;
}
break;
case CTRL_T: /* ctrl-t, swaps current character with previous. */
if (l.pos > 0 && l.pos < l.len) {
int aux = buf[l.pos - 1];
buf[l.pos - 1] = buf[l.pos];
buf[l.pos] = aux;
if (l.pos != l.len - 1) l.pos++;
refreshLine(&l);
}
break;
case CTRL_B: /* ctrl-b */
linenoiseEditMoveLeft(&l);
break;
case CTRL_F: /* ctrl-f */
linenoiseEditMoveRight(&l);
break;
case CTRL_P: /* ctrl-p */
linenoiseEditHistoryNext(&l, LINENOISE_HISTORY_PREV);
break;
case CTRL_N: /* ctrl-n */
linenoiseEditHistoryNext(&l, LINENOISE_HISTORY_NEXT);
break;
/* escape sequence */
case ESC:
seq[0] = serial.getc();
seq[1] = serial.getc();
if (seq[0] == ARROW_PREFIX && seq[1] == LEFT_ARROW) {
/* Left arrow */
linenoiseEditMoveLeft(&l);
} else if (seq[0] == ARROW_PREFIX && seq[1] == RIGHT_ARROW) {
/* Right arrow */
linenoiseEditMoveRight(&l);
} else if (seq[0] == ARROW_PREFIX && (seq[1] == UP_ARROW || seq[1] == DOWN_ARROW)) {
/* Up and Down arrows */
linenoiseEditHistoryNext(&l,
(seq[1] == UP_ARROW) ? LINENOISE_HISTORY_PREV :
LINENOISE_HISTORY_NEXT);
}
//Here is also a extanded escape!
break;
default:
linenoiseEditInsert(&l, c);
break;
case CTRL_U: /* Ctrl+u, delete the whole line. */
buf[0] = '\0';
l.pos = l.len = 0;
refreshLine(&l);
break;
case CTRL_K: /* Ctrl+k, delete from current to end of line. */
buf[l.pos] = '\0';
l.len = l.pos;
refreshLine(&l);
break;
case CTRL_A: /* Ctrl+a, go to the start of the line */
l.pos = 0;
refreshLine(&l);
break;
case CTRL_E: /* ctrl+e, go to the end of the line */
l.pos = l.len;
refreshLine(&l);
break;
case CTRL_L: /* ctrl+l, clear screen */
linenoiseClearScreen();
refreshLine(&l);
break;
case CTRL_W: /* ctrl+w, delete previous word */
linenoiseEditDeletePrevWord(&l);
break;
}
}
return l.len;
}
static int linenoiseRaw(char *buf, size_t buflen, const char *prompt)
{
int count;
count = linenoiseEdit(buf, buflen, prompt);
serial.puts("\n\r");
return count;
}
void lineedit_move_left()
{
linenoiseEditMoveLeft(&l);
}
