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/* $Id$ */
/*
 * watch -- execute program repeatedly, displaying output fullscreen
 * Based on the original 1991 'watch' by Tony Rems <rembo@unisoft.com>
 * (with mods and corrections by Francois Pinard)
 */
/*
 * Copyright (c) 2003 demon <demon@vhost.dymdns.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <err.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <time.h>
#include <signal.h>
#include <curses.h>
#define MAXBUF 255

static char *copyright = "(c) 2003 demon <demon@vhost.dyndns.org>";
static char *version   = "0.2";
extern char *__progname;

time_t tval;
int die_flag;
int period=2;

void title();
void usage();
void die();

int main (int argc, char **argv) {
    int n_flag=0;
    char ch;
    char cmd[MAXBUF];
    char buf[MAXBUF];
    FILE *pipe;
    
    signal(SIGINT, die);
    signal(SIGTERM, die);
    signal(SIGHUP, die);
    
    while ((ch = getopt(argc, argv, "s:vn")) != -1)
	switch (ch) {
	    case 'v':
		(void)fprintf(stderr, "%s %s %s\n", __progname, version, copyright);
		exit(1);
		break;
	    case 's':
		period = atoi(optarg);
		if(period < 1)
		    usage();
		break;
	    case 'n':
		n_flag=1;
		break;
	    case '?':
	    default:
		usage();
	}
    argc -= optind;
    argv += optind;

    if(*argv) {
        strncpy(cmd, *argv, sizeof(cmd)-1);
	while(*++argv) {
	    strncat(cmd, " ", sizeof(cmd)-1);
	    strncat(cmd, *argv, sizeof(cmd)-1);
	}
    } else {
	if(isatty(fileno(stdin)))
	    fprintf(stderr, "Command: ");
	(void)fgets(cmd, sizeof(cmd), stdin);
        cmd[strlen(cmd) - 1] = '\0';
    }

    if(strlen(cmd)) {
	initscr();
	while(!die_flag) {
	    move(0,0);
	    if(!n_flag)
	        title(cmd);
	    pipe = popen(cmd, "r");
	    while(fgets(buf, sizeof(buf), pipe))
		printw("%s",buf);
	    refresh();
	    pclose(pipe);
	    sleep(period);
	}
	endwin();
    } else {
	usage();
    }

    exit(0);
}

void title(char **cmd) {
    char curtime[30];
    time(&tval);
    strncpy(curtime, ctime(&tval), sizeof(curtime)-1);
    curtime[strlen(curtime) - 6] = '\0';
    printw("%s\tEvery %ds: %s", curtime, period, cmd);
    move(2,0);
}

void usage() {
    (void)fprintf(stderr, "Usage: %s [-s <seconds> ] [ -vn ] [command]\n", __progname);
    exit (1);
}

void die() {
    die_flag=1;
}