filter.c   [plain text]

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/*
 * Author:  Thomas E. Dickey <dickey@clark.net> 1998
 *
 * $Id: filter.c,v 1.11 2006/12/09 16:53:47 tom Exp $
 */
#include <test.priv.h>

#if HAVE_FILTER

/*
 * An example of the 'filter()' function in ncurses, this program prompts
 * for commands and executes them (like a command shell).  It illustrates
 * how ncurses can be used to implement programs that are not full-screen.
 *
 * Ncurses differs slightly from SVr4 curses.  The latter does not flush its
 * state when exiting program mode, so the attributes on the command lines of
 * this program 'bleed' onto the executed commands.  Rather than use the
 * reset_shell_mode() and reset_prog_mode() functions, we could invoke endwin()
 * and refresh(), but that does not work any better.
 */

static int
new_command(char *buffer, int length, attr_t underline)
{
    int code;

    attron(A_BOLD);
    printw("Command: ");
    attron(underline);
    code = getnstr(buffer, length);
    /*
     * If this returns anything except ERR/OK, it would be one of ncurses's
     * extensions.  Fill the buffer with something harmless that the shell
     * will execute as a comment.
     */
#ifdef KEY_EVENT
    if (code == KEY_EVENT)
	strcpy(buffer, "# event!");
#endif
#ifdef KEY_RESIZE
    if (code == KEY_RESIZE) {
	strcpy(buffer, "# resize!");
	getch();
    }
#endif
    attroff(underline);
    attroff(A_BOLD);
    printw("\n");

    return code;
}

int
main(int argc GCC_UNUSED, char *argv[]GCC_UNUSED)
{
    char buffer[80];
    attr_t underline;

    setlocale(LC_ALL, "");

    filter();
    (void) newterm((char *) 0, stdout, stdin);
    cbreak();
    keypad(stdscr, TRUE);

    if (has_colors()) {
	int background = COLOR_BLACK;
	start_color();
#if HAVE_USE_DEFAULT_COLORS
	if (use_default_colors() != ERR)
	    background = -1;
#endif
	init_pair(1, COLOR_CYAN, background);
	underline = COLOR_PAIR(1);
    } else {
	underline = A_UNDERLINE;
    }

    while (new_command(buffer, sizeof(buffer) - 1, underline) != ERR
	   && strlen(buffer) != 0) {
	reset_shell_mode();
	printf("\n");
	fflush(stdout);
	system(buffer);
	reset_prog_mode();
	touchwin(stdscr);
	erase();
	refresh();
    }
    printw("done");
    refresh();
    endwin();
    ExitProgram(EXIT_SUCCESS);
}
#else
int
main(void)
{
    printf("This program requires the filter function\n");
    ExitProgram(EXIT_FAILURE);
}
#endif /* HAVE_FILTER */