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lib/mp-readline: Allow overriding implementation of cursor functions 

Default implementation uses VT100-style sequences which are not implemented
by all terminals out there
This commit is contained in:
stijn 2015-05-28 13:35:38 +02:00 committed by Paul Sokolovsky
parent 9a522dda6e
commit 278d22ce8f
1 changed files with 13 additions and 5 deletions
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18
lib/mp-readline/readline.c
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@ -60,7 +60,14 @@ STATIC char *str_dup_maybe(const char *str) {
return s2;
}
STATIC void move_cursor_back(uint pos) {
// By default assume terminal which implements VT100 commands...
#ifndef MICROPY_HAL_HAS_VT100
#define MICROPY_HAL_HAS_VT100 (1)
#endif
// ...and provide the implementation using them
#if MICROPY_HAL_HAS_VT100
STATIC void mp_hal_move_cursor_back(uint pos) {
if (pos <= 4) {
// fast path for most common case of 1 step back
mp_hal_stdout_tx_strn("\b\b\b\b", pos);
@ -75,9 +82,10 @@ STATIC void move_cursor_back(uint pos) {
}
}
STATIC void erase_line_from_cursor(void) {
STATIC void mp_hal_erase_line_from_cursor(void) {
mp_hal_stdout_tx_strn("\x1b[K", 3);
}
#endif
typedef struct _readline_t {
vstr_t *line;
@ -257,19 +265,19 @@ end_key:
// redraw command prompt, efficiently
if (redraw_step_back > 0) {
move_cursor_back(redraw_step_back);
mp_hal_move_cursor_back(redraw_step_back);
rl.cursor_pos -= redraw_step_back;
}
if (redraw_from_cursor) {
if (rl.line->len < last_line_len) {
// erase old chars
// (number of chars to erase: last_line_len - rl.cursor_pos)
erase_line_from_cursor();
mp_hal_erase_line_from_cursor();
}
// draw new chars
mp_hal_stdout_tx_strn(rl.line->buf + rl.cursor_pos, rl.line->len - rl.cursor_pos);
// move cursor forward if needed (already moved forward by length of line, so move it back)
move_cursor_back(rl.line->len - (rl.cursor_pos + redraw_step_forward));
mp_hal_move_cursor_back(rl.line->len - (rl.cursor_pos + redraw_step_forward));
rl.cursor_pos += redraw_step_forward;
} else if (redraw_step_forward > 0) {
// draw over old chars to move cursor forwards