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#include <u.h>
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#include <libc.h>
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#include <draw.h>
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#include <event.h>
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#include <bio.h>
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#include "page.h"
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Document*
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initfilt(Biobuf *b, int argc, char **argv, uchar *buf, int nbuf, char *type, char *cmd, int docopy)
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{
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	int ofd;
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	int p[2];
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	char xbuf[8192];
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	int n;
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	if(argc > 1) {
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		fprint(2, "can only view one %s file at a time\n", type);
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		return nil;
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	}
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	fprint(2, "converting from %s to postscript...\n", type);
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	if(docopy){
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		if(pipe(p) < 0){
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			fprint(2, "pipe fails: %r\n");
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			exits("Epipe");
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		}
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	}else{
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		p[0] = open("/dev/null", ORDWR);
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		p[1] = open("/dev/null", ORDWR);
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	}
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	ofd = opentemp("/tmp/pagecvtXXXXXXXXX");
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	switch(fork()){
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	case -1:
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		fprint(2, "fork fails: %r\n");
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		exits("Efork");
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	default:
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		close(p[1]);
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		if(docopy){
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			write(p[0], buf, nbuf);
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			if(b)
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				while((n = Bread(b, xbuf, sizeof xbuf)) > 0)
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					write(p[0], xbuf, n);
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			else
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				while((n = read(stdinfd, xbuf, sizeof xbuf)) > 0)
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					write(p[0], xbuf, n);
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		}
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		close(p[0]);
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		waitpid();
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		break;
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	case 0:
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		close(p[0]);
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		dup(p[1], 0);
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		dup(ofd, 1);
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		/* stderr shines through */
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		execl("/bin/rc", "rc", "-c", cmd, nil);
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		break;
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	}
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	if(b)
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		Bterm(b);
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	seek(ofd, 0, 0);
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	b = emalloc(sizeof(Biobuf));
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	Binit(b, ofd, OREAD);
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	return initps(b, argc, argv, nil, 0);
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}
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Document*
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initdvi(Biobuf *b, int argc, char **argv, uchar *buf, int nbuf)
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{
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	int fd;
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	char *name;
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	char cmd[256];
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	char fdbuf[20];
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	/*
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	 * Stupid DVIPS won't take standard input.
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	 */
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	if(b == nil){	/* standard input; spool to disk (ouch) */
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		fd = spooltodisk(buf, nbuf, &name);
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		sprint(fdbuf, "/fd/%d", fd);
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		b = Bopen(fdbuf, OREAD);
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		if(b == nil){
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			fprint(2, "cannot open disk spool file\n");
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			wexits("Bopen temp");
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		}
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		argv = &name;
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		argc = 1;
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	}
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	snprint(cmd, sizeof cmd, "dvips -Pps -r0 -q1 -f1 '%s'", argv[0]);
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	return initfilt(b, argc, argv, buf, nbuf, "dvi", cmd, 0);
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}
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Document*
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inittroff(Biobuf *b, int argc, char **argv, uchar *buf, int nbuf)
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{
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	/* Added -H to eliminate header page [sape] */
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	return initfilt(b, argc, argv, buf, nbuf, "troff", "lp -H -dstdout", 1);
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}
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Document*
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initmsdoc(Biobuf *b, int argc, char **argv, uchar *buf, int nbuf)
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{
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	return initfilt(b, argc, argv, buf, nbuf, "microsoft office", "doc2ps", 1);
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}