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/* watch.c - Execute a program periodically
*
* Copyright 2013 Sandeep Sharma <sandeep.jack2756@gmail.com>
* Copyright 2013 Kyungwan Han <asura321@gmail.com>
*
USE_WATCH(NEWTOY(watch, "^<1n#<0=2teb", TOYFLAG_USR|TOYFLAG_BIN))
config WATCH
bool "watch"
default n
help
usage: watch [-n SEC] [-t] PROG ARGS
Run PROG periodically
-n Loop period in seconds (default 2)
-t Don't print header
-e Freeze updates on command error, and exit after enter.
-b Beep on command error
*/
#define FOR_watch
#include "toys.h"
GLOBALS(
int interval;
)
void watch_main(void)
{
int i = 0, hlen;
time_t t;
unsigned width = 80, len = sizeof("Www Mmm dd hh:mm:ss yyyy") - 1 ;
char *header, *cmd = *toys.optargs;
int retval;
while (toys.optargs[++i])
{
char * oldcmd = cmd;
cmd = xmprintf("%s %s", oldcmd, toys.optargs[i]);
if (CFG_TOYBOX_FREE) free(oldcmd);
}
header = xmprintf("Every %us: %s", TT.interval, cmd);
hlen = strlen(header);
while(1) {
xprintf("\033[H\033[J");
if (!(toys.optflags & FLAG_t)) {
terminal_size(&width, NULL);
if (!width) width = 80; //on serial it may return 0.
time(&t);
if (width > (hlen + len)) xprintf("%s", header);
if (width >= len)
xprintf("%*s\n",width + ((width > (hlen + len))?-hlen:0) + 1, ctime(&t));
else
xprintf("\n\n");
}
fflush(NULL); //making sure the screen is clear
retval = system(cmd);
if ((toys.optflags & FLAG_b) && retval)
xprintf("\007");
if ((toys.optflags & FLAG_e) && retval) {
xprintf("command exit with non-zero status, press enter to exit\n");
getchar();
break;
}
sleep(TT.interval);
}
if (CFG_TOYBOX_FREE){
free(header);
if (cmd != *toys.optargs) free(cmd);
}
}
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