dorne/cli/curse.c

#include <locale.h>
#include <unistd.h>

#include "curse.h"

#define BASE_DELAY 1000000
#define CRS_LOCALE "en_US.UTF-8"

/* Set ncurses terminal mode (buffering, character processing,
 * Key->SIG handling, and other termios(3) functionality).
 */
inline int termmode(enum crs_mode mode) {
  switch (mode) {
  case WMODE_CBREAK:
    return cbreak();
  case WMODE_RAW:
    return raw();
  case WMODE_NOCBREAK:
    return nocbreak();
  case WMODE_NORAW:
    return noraw();
    /* defaulting is not possible. */
  }
}

/* Initialise ncurses for our usecase.
 * WARNING: This function should only be called once.
 */
inline void init_ncurses(void) {
  // ncurses expects a locale for consistent behaviour
  setlocale(LC_ALL, CRS_LOCALE);

  /* NCurses Init */
  start_color();

  /* Screen Configuration */
  termmode(WMODE_CBREAK);
  noecho();               // manually echo <- getch(3x)

  curs_set(0); // hide cursor

  // init_pair(1, COLOR_BLACK, COLOR_CYAN);
}

WINDOW *init_window(int x, int y, int width, int height) {
  WINDOW *win = newwin(height, width, y, x);
  
  nodelay(win, TRUE); // getch(3x) nonblocking IO
  keypad(win, TRUE);  // allow function keys
  // intrflush(3x) - flush terminal input buffer on interrupt key
  intrflush(win, FALSE);

  return win;
}

int main(int argc, char *argv[]) {
  init_ncurses();
  WINDOW *stdscr = init_window(0, 0, 0, 0);

  // Set background
  wbkgd(stdscr, COLOR_PAIR(1));

  attron(COLOR_PAIR(1));
  attron(A_BOLD);
  int counter = 0;
  while (1) {
    mvprintw(0, 0, "COUNTER %d", counter++);
    refresh();

    switch (getch()) {
    case 'q':
      goto end;
    default:
      break;
    }

    usleep(BASE_DELAY);
  }

end:
  endwin();
  return 0;
}