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).
 */
int termmode(const enum crs_termmode mode) {
  switch (mode) {
  case TMODE_CBREAK:
    return cbreak();
  case TMODE_RAW:
    return raw();
  case TMODE_NOCBREAK:
    return nocbreak();
  case TMODE_NORAW:
    return noraw();
  default:
    /* defaulting is not possible. */
    return 1;
  }
}

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

  /* NCurses Init */
  start_color();

  /* Screen Configuration */
  termmode(TMODE_CBREAK);
  noecho(); // manually echo from getch(3x)

  curs_set(0); // hide cursor
}

/* Apply a default IO configuration for an ncurses WINDOW.
 */
static inline void __conf_window(WINDOW *const win) {
  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);
}

/* Initialise (with default IO configuration) a new ncurses WINDOW.
 */
WINDOW *new_window(const int x, const int y, const int width,
                   const int height) {
  WINDOW *win = newwin(height, width, y, x);
  __conf_window(win);

  return win;
}

/* Initialise (with default IO configuration) the root ncurses WINDOW.
 * NOTE: This is typically done via initscr(3x) and called "stdscr".
 */
WINDOW *root_window(void) {
  WINDOW *rootwin = new_window(0, 0, 0, 0);
  __conf_window(rootwin);
  return rootwin;
}

/*
int main(const int argc, const char *const argv[]) {
  init_ncurses();
  WINDOW *stdscr = new_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;
}
*/