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/****************************************************************************
* Copyright (c) 1998-2012,2014 Free Software Foundation, Inc. *
* *
* Permission is hereby granted, free of charge, to any person obtaining a *
* copy of this software and associated documentation files (the *
* "Software"), to deal in the Software without restriction, including *
* without limitation the rights to use, copy, modify, merge, publish, *
* distribute, distribute with modifications, sublicense, and/or sell *
* copies of the Software, and to permit persons to whom the Software is *
* furnished to do so, subject to the following conditions: *
* *
* The above copyright notice and this permission notice shall be included *
* in all copies or substantial portions of the Software. *
* *
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
* IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
* THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
* *
* Except as contained in this notice, the name(s) of the above copyright *
* holders shall not be used in advertising or otherwise to promote the *
* sale, use or other dealings in this Software without prior written *
* authorization. *
****************************************************************************/
/*
* Author: Thomas E. Dickey <dickey@clark.net> 1998
*
* $Id: filter.c,v 1.16 2014/08/09 22:35:51 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, int 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;
}
static void
usage(void)
{
static const char *msg[] =
{
"Usage: filter [options]"
,""
,"Options:"
," -i use initscr() rather than newterm()"
};
unsigned n;
for (n = 0; n < SIZEOF(msg); n++)
fprintf(stderr, "%s\n", msg[n]);
ExitProgram(EXIT_FAILURE);
}
int
main(int argc, char *argv[])
{
int ch;
char buffer[80];
int underline;
bool i_option = FALSE;
setlocale(LC_ALL, "");
while ((ch = getopt(argc, argv, "i")) != -1) {
switch (ch) {
case 'i':
i_option = TRUE;
break;
default:
usage();
}
}
printf("starting filter program using %s...\n",
i_option ? "initscr" : "newterm");
filter();
if (i_option) {
initscr();
} else {
(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, (short) 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);
IGNORE_RC(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 */
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