/* See LICENSE file for copyright and license details. */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "text.h"
#include "util.h"

static void
usage(void)
{
	eprintf("usage: %s predicate\n", argv0);
}

int
main(int argc, char *argv[])
{
	char *buf = NULL;
	size_t size = 0;
	int i, status;
	pid_t pid;

	ARGBEGIN {
	default:
		usage();
	} ARGEND;

	if(!argc)
		usage();

	argv = memmove(argv-1, argv, argc * sizeof(char *));

	while(afgets(&buf, &size, stdin)) {
		if(buf[i = strlen(buf)-1] == '\n')
			buf[i] = 0;
		argv[argc] = buf;
		if((pid = fork()) == -1)
			eprintf("fork:");
		if(pid == 0) {
			execvp(*argv, argv);
			eprintf("%s %s:", argv0, *argv);
		}
		while(wait(&status) != pid);
		if(!status)
			puts(buf);
	}
	return EXIT_SUCCESS;
}