renamed C folder

C_C++/ncurses_plus_readline.cpp

@@ -0,0 +1,70 @@
+// @COMPILECMD g++ $@ $(pkg-config --libs ncurses readline)
+#include <ncurses.h>
+#include <readline/readline.h>
+
+#define WINDOW_WIDTH 32
+#define WINDOW_HEIGHT 3
+
+int scr_h, scr_w;
+WINDOW* myWindow;
+
+int input_available = false;	// C style bool to track when to stop reading
+char input;						// our input; since we read char-by-char this is all the buffering we need
+
+inline void init(){
+	// Ncurses (nothing special)
+	initscr();
+	noecho();
+	curs_set(0);
+
+	getmaxyx(stdscr, scr_h, scr_w);
+	myWindow = newwin(WINDOW_HEIGHT, WINDOW_WIDTH, 
+			( scr_h / 2 ) - 1, ( scr_w - WINDOW_WIDTH) / 2);
+	refresh();
+
+	box(myWindow, 0, 0);
+	// Readline
+	//   make readline shut up
+	rl_bind_key('\t', rl_insert);	// make tab insert itself
+	rl_catch_signals = 0;			// do not install signal handlers
+	rl_catch_sigwinch = 0;			// do not care about window change signals
+	rl_prep_term_function = NULL;	// do not initialize the ternimal
+	rl_deprep_term_function = NULL; // do not clean up
+	rl_change_environment = 0;		// ?!
+	//   bind callbacks, for seemless integration
+	rl_getc_function = +[](FILE* ignore){	// define how Readline is handed chars
+		input_available = false; // since we read 1 char at the time we know that there will be no more available
+		return (int)input;
+	};
+	rl_input_available_hook = +[]{	// let Readline know that it shall call it rl_getc_function
+		return input_available;
+	};
+	rl_redisplay_function = +[]{	// instruct Readline what to do after rl_line_buffer has changed
+		// echo rl_line_buffer (without using the terminals built in echo)
+		wmove(myWindow, 1, 1);
+		wclrtoeol(myWindow);
+		box(myWindow, 0, 0);	// wclrtoeol(), screws with the box
+		waddstr(myWindow, rl_line_buffer);
+		wrefresh(myWindow);
+		return;
+	};
+	rl_callback_handler_install("", +[](char *line){	// instruct Readline what to do once rl_line_buffer is submitted (enter hit)
+		// print the submitted line to the top of the screen
+		wmove(stdscr, 0, 0);
+		wclrtoeol(stdscr);
+		waddstr(stdscr, line);
+		wrefresh(stdscr);
+		return;
+	});
+}
+
+signed main(){
+	init();
+	wrefresh(myWindow);
+
+	while(1){
+		input = wgetch(myWindow);
+		input_available = true;
+		rl_callback_read_char();
+	}
+}