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Add simple readline history.

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This commit is contained in:
Damien 2013-10-26 02:29:02 +01:00
parent 8128941e6c
commit 9281cd66c9
1 changed files with 63 additions and 14 deletions
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77
stm/main.c
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@ -3,6 +3,7 @@
#include <stm32f4xx_rcc.h>
#include <stm32f4xx_gpio.h>
#include <stm32f4xx_tim.h>
#include <stm32f4xx_pwr.h>
#include <stm32f4xx_rtc.h>
#include <stm_misc.h>
#include "std.h"
@ -225,29 +226,77 @@ static py_obj_t pyb_info(void) {
return py_const_none;
}
char *strdup(const char *str) {
uint32_t len = strlen(str);
char *s2 = m_new(char, len + 1);
memcpy(s2, str, len);
s2[len] = 0;
return s2;
}
#define READLINE_HIST_SIZE (8)
static const char *readline_hist[READLINE_HIST_SIZE] = {NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL};
int readline(vstr_t *line, const char *prompt) {
usb_vcp_send_str(prompt);
int len = vstr_len(line);
int escape = 0;
int hist_num = 0;
for (;;) {
while (usb_vcp_rx_any() == 0) {
sys_tick_delay_ms(10);
sys_tick_delay_ms(1);
}
char c = usb_vcp_rx_get();
if (c == 4 && vstr_len(line) == len) {
return 0;
} else if (c == '\r') {
usb_vcp_send_str("\r\n");
return 1;
} else if (c == 127) {
if (vstr_len(line) > len) {
vstr_cut_tail(line, 1);
usb_vcp_send_str("\b \b");
if (escape == 0) {
if (c == 4 && vstr_len(line) == len) {
return 0;
} else if (c == '\r') {
usb_vcp_send_str("\r\n");
for (int i = READLINE_HIST_SIZE - 1; i > 0; i--) {
readline_hist[i] = readline_hist[i - 1];
}
readline_hist[0] = strdup(vstr_str(line));
return 1;
} else if (c == 27) {
escape = true;
} else if (c == 127) {
if (vstr_len(line) > len) {
vstr_cut_tail(line, 1);
usb_vcp_send_str("\b \b");
}
} else if (32 <= c && c <= 126) {
vstr_add_char(line, c);
usb_vcp_send_strn(&c, 1);
}
} else if (32 <= c && c <= 126) {
vstr_add_char(line, c);
usb_vcp_send_strn(&c, 1);
} else if (escape == 1) {
if (c == '[') {
escape = 2;
} else {
escape = 0;
}
} else if (escape == 2) {
escape = 0;
if (c == 'A') {
// up arrow
if (hist_num < READLINE_HIST_SIZE && readline_hist[hist_num] != NULL) {
// erase line
for (int i = line->len - len; i > 0; i--) {
usb_vcp_send_str("\b \b");
}
// set line to history
line->len = len;
vstr_add_str(line, readline_hist[hist_num]);
// draw line
usb_vcp_send_str(readline_hist[hist_num]);
// increase hist num
hist_num += 1;
}
}
} else {
escape = 0;
}
sys_tick_delay_ms(100);
sys_tick_delay_ms(10);
}
}