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/**
* run lua interpreter from finsh
*/
#include "rtthread.h"
#include "finsh.h"
#include "shell.h"
struct
{
struct rt_semaphore sem;
rt_device_t device;
} dev4lua;
extern int lua_main(int argc, char **argv);
rt_err_t lua_rx_ind(rt_device_t dev, rt_size_t size)
{
rt_sem_release(&dev4lua.sem);
return RT_EOK;
}
void finsh_lua(void *parameter)
{
rt_err_t (*rx_indicate)(rt_device_t dev, rt_size_t size);
rt_sem_init(&(dev4lua.sem), "luasem", 0, 0);
/* save old rx_indicate */
rx_indicate = dev4lua.device->rx_indicate;
/* set new rx_indicate */
rt_device_set_rx_indicate(dev4lua.device, lua_rx_ind);
{
int argc = 1;
char *argv[] = {"lua", NULL};
/* run lua interpreter */
lua_main(argc, argv);
}
/* recover old rx_indicate */
rt_device_set_rx_indicate(dev4lua.device, rx_indicate);
}
static void lua(void)
{
rt_thread_t lua_thread;
const char* device_name = finsh_get_device();
rt_device_t device = rt_device_find(device_name);
if (device == RT_NULL)
{
rt_kprintf("%s not find\n", device_name);
return;
}
dev4lua.device = device;
#if 0
/* Run lua interpreter in separate thread */
lua_thread = rt_thread_create("lua",
finsh_lua,
0,
2048,
rt_thread_self()->current_priority + 1,
20);
if (lua_thread != RT_NULL)
{
rt_thread_startup(lua_thread);
}
#else
/* Directly run lua interpreter in finsh */
finsh_lua(0);
#endif
}
FINSH_FUNCTION_EXPORT(lua, lua interpreter)
int readline4lua(const char *prompt, char *buffer, int buffer_size)
{
char ch;
int line_position;
start:
/* show prompt */
rt_kprintf(prompt);
line_position = 0;
memset(buffer, 0, buffer_size);
while (1)
{
if (rt_sem_take(&dev4lua.sem, RT_WAITING_FOREVER) != RT_EOK)
{
return 0;
}
while (rt_device_read(dev4lua.device, 0, &ch, 1) == 1)
{
/* handle CR key */
if (ch == '\r')
{
char next;
if (rt_device_read(dev4lua.device, 0, &next, 1) == 1)
ch = next;
}
/* backspace key */
else if (ch == 0x7f || ch == 0x08)
{
if (line_position > 0)
{
rt_kprintf("%c %c", ch, ch);
line_position--;
}
buffer[line_position] = 0;
continue;
}
/* EOF(ctrl+d) */
else if (ch == 0x04)
{
if (line_position == 0)
/* No input which makes lua interpreter close */
return 0;
else
continue;
}
/* end of line */
if (ch == '\r' || ch == '\n')
{
buffer[line_position] = 0;
rt_kprintf("\n");
if (line_position == 0)
{
/* Get a empty line, then go to get a new line */
goto start;
}
else
{
return line_position;
}
}
/* other control character or not an acsii character */
if (ch < 0x20 || ch >= 0x80)
{
continue;
}
/* echo */
rt_kprintf("%c", ch);
buffer[line_position] = ch;
ch = 0;
line_position++;
/* it's a large line, discard it */
if (line_position >= buffer_size)
line_position = 0;
}
}
}
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