simple.c

This is an example demonstrating libtui_draw, libtui_renderer, libtui_keyboard and libtui_term_control modules with an example of how to handle errors properly.

#include <stdio.h>
 
#include "../lib/libtui.h"
 
void cleanup()
{
    libtui_show_cursor();
}
 
void rerr(enum LIBTUI_RENDERER_ERR res)
{
    if (res != RENDERER_ERROR_OK) {
        fprintf(stderr, "Error: %s\n", libtui_renderer_err_str(res));
        cleanup();
        exit(-1);
    }
}
 
void derr(enum LIBTUI_DRAW_ERR res)
{
    if (res != DRAW_ERROR_OK) {
        fprintf(stderr, "Error: %s\n", libtui_draw_err_str(res));
        exit(-2);
    }
}
 
int main(int argc, char *argv[])
{
    atexit(cleanup);
    struct libtui_renderer *r = NULL;
    rerr(libtui_renderer_create(50, 22, &r));
 
    derr(libtui_draw_clear_with_char(r, '_'));
 
    size_t x = 0;
    size_t y = 0;
 
    libtui_true_clear();
 
    libtui_hide_cursor();
 
    while (1) {
        if (libtui_keyboard_is_kb_hit()) {
            enum LIBTUI_KEYCODE key = libtui_keyboard_get_key();
            if (key == KEY_J) {
                ++y;
            } else if (key == KEY_K) {
                --y;
            } else if (key == KEY_H) {
                --x;
            } else if (key == KEY_L) {
                ++x;
            } else if (key == KEY_ESC) {
                break;
            }
        }
 
        derr(libtui_draw_single_char(r, 'F', x, y));
        rerr(libtui_renderer_render(r));
    }
 
    libtui_show_cursor();
 
    rerr(libtui_renderer_free(r));
 
    return 0;
}