71 lines
2.1 KiB
C++
71 lines
2.1 KiB
C++
// @COMPILECMD g++ $@ $(pkg-config --libs ncurses readline)
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#include <ncurses.h>
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#include <readline/readline.h>
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#define WINDOW_WIDTH 32
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#define WINDOW_HEIGHT 3
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int scr_h, scr_w;
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WINDOW* myWindow;
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int input_available = false; // C style bool to track when to stop reading
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char input; // our input; since we read char-by-char this is all the buffering we need
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inline void init(){
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// Ncurses (nothing special)
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initscr();
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noecho();
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curs_set(0);
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getmaxyx(stdscr, scr_h, scr_w);
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myWindow = newwin(WINDOW_HEIGHT, WINDOW_WIDTH,
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( scr_h / 2 ) - 1, ( scr_w - WINDOW_WIDTH) / 2);
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refresh();
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box(myWindow, 0, 0);
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// Readline
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// make readline shut up
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rl_bind_key('\t', rl_insert); // make tab insert itself
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rl_catch_signals = 0; // do not install signal handlers
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rl_catch_sigwinch = 0; // do not care about window change signals
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rl_prep_term_function = NULL; // do not initialize the ternimal
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rl_deprep_term_function = NULL; // do not clean up
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rl_change_environment = 0; // ?!
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// bind callbacks, for seemless integration
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rl_getc_function = +[](FILE* ignore){ // define how Readline is handed chars
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input_available = false; // since we read 1 char at the time we know that there will be no more available
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return (int)input;
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};
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rl_input_available_hook = +[]{ // let Readline know that it shall call it rl_getc_function
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return input_available;
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};
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rl_redisplay_function = +[]{ // instruct Readline what to do after rl_line_buffer has changed
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// echo rl_line_buffer (without using the terminals built in echo)
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wmove(myWindow, 1, 1);
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wclrtoeol(myWindow);
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box(myWindow, 0, 0); // wclrtoeol(), screws with the box
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waddstr(myWindow, rl_line_buffer);
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wrefresh(myWindow);
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return;
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};
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rl_callback_handler_install("", +[](char *line){ // instruct Readline what to do once rl_line_buffer is submitted (enter hit)
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// print the submitted line to the top of the screen
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wmove(stdscr, 0, 0);
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wclrtoeol(stdscr);
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waddstr(stdscr, line);
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wrefresh(stdscr);
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return;
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});
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}
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signed main(){
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init();
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wrefresh(myWindow);
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while(1){
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input = wgetch(myWindow);
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input_available = true;
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rl_callback_read_char();
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}
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}
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