shithub: pplay

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prepare for piping: link chains, not nodes; properly separate insert/replace; generalize pipeto

--- a/cmd.c

+++ b/cmd.c

@@ -15,13 +15,13 @@

 static int epfd[2];

 static void

-printchunks(void)

+printchunks(Chunk *r)

 {

 	Chunk *c;

 	fprint(2, "chunklist dot %zux %zux %zux: ", 

 		dot.from.pos, dot.pos, dot.to.pos);

-	for(c=norris.right; c!=&norris; c=c->right)

+	for(c=r->right; c!=r; c=c->right)

 		fprint(2, "%#p:%zux ", c, c->bufsz);

 	fprint(2, "\n");

 }

@@ -35,6 +35,8 @@

 	c = emalloc(sizeof *c);

 	c->bufsz = n;

 	c->buf = emalloc(c->bufsz);

+	c->left = c;

+	c->right = c;

 	return c;

 }

@@ -61,9 +63,9 @@

 static void

 linkchunk(Chunk *left, Chunk *c)

 {

-	c->right = left->right;

+	c->left->right = left->right;

 	c->left = left;

-	c->right->left = c;

+	left->right->left = c->left;

 	left->right = c;

 }

@@ -282,29 +284,35 @@

 }

 static int

-paste(char *)

+replace(char *)

 {

 	Chunk *c, *l, *dotc;

 	c = clonechunk();

-	if(dot.from.pos == 0 && dot.to.pos == totalsz){		/* insert */

-		linkchunk(p2c(dot.pos, nil), c);

-		setrange(dot.pos, dot.pos + c->bufsz);

-		totalsz += c->bufsz;

-	}else{						/* replace */

-		dotc = p2c(dot.pos, nil);

-		l = dotc->left;

-		totalsz -= dotc->bufsz;

-		unlinkchunk(dotc);

-		freechunk(dotc);

-		linkchunk(l, c);

-		setrange(dot.from.pos, dot.from.pos + c->bufsz);

-		totalsz += c->bufsz;

-	}

+	dotc = p2c(dot.pos, nil);

+	l = dotc->left;

+	totalsz -= dotc->bufsz;

+	unlinkchunk(dotc);

+	freechunk(dotc);

+	linkchunk(l, c);

+	setrange(dot.from.pos, dot.from.pos + c->bufsz);

+	totalsz += c->bufsz;

 	return 1;

 }

 static int

+insert(char *)

+{

+	Chunk *c;

+

+	c = clonechunk();

+	linkchunk(p2c(dot.pos, nil), c);

+	setrange(dot.pos, dot.pos + c->bufsz);

+	totalsz += c->bufsz;

+	return 1;

+}

+

+static int

 copy(char *)

 {

 	splitdot();

@@ -330,7 +338,6 @@

 	Chunk *c, *d;

 	Δ = 0;

-	printchunks();

 	for(c=norris.right; c!=&norris; c=d){

 		if(Δ + c->bufsz >= dot.from.pos)

 			break;

@@ -384,11 +391,10 @@

 {

 	int n;

 	usize off;

-	Chunk *c, *nc;

+	Chunk *rc, *c, *nc;

-	c = newchunk(Iochunksz);

-	linkchunk(&norris, c);

-	for(off=0;; off+=n){

+	rc = newchunk(Iochunksz);

+	for(off=0, c=rc;; off+=n){

 		if(off == Iochunksz){

 			totalsz += Iochunksz;

 			nc = newchunk(Iochunksz);

@@ -405,7 +411,8 @@

 	c->buf = erealloc(c->buf, off, c->bufsz);

 	c->bufsz = off;

 	totalsz += c->bufsz;

-	return norris.right;

+	printchunks(rc);

+	return rc;

 }

 static int

@@ -435,26 +442,47 @@

 static void

 rc(void *s)

 {

-	close(epfd[1]);

 	dup(epfd[0], 0);

+	dup(epfd[1], 1);

 	close(epfd[0]);

+	close(epfd[1]);

 	procexecl(nil, "/bin/rc", "rc", "-c", s, nil);

 	sysfatal("procexec: %r");

 }

 static int

-pipeto(char *arg)

+pipeline(char *arg, int rr, int wr)

 {

 	if(pipe(epfd) < 0)

 		sysfatal("pipe: %r");

 	if(procrfork(rc, arg, mainstacksize, RFFDG|RFNOTEG|RFNAMEG) < 0)

 		sysfatal("procrfork: %r");

-	close(epfd[0]);

-	writebuf(epfd[1]);

+	if(wr)

+		writebuf(epfd[1]);

 	close(epfd[1]);

+	USED(rr);

+	close(epfd[0]);

 	return 0;

 }

+static int

+pipeto(char *arg)

+{

+	return pipeline(arg, 0, 1);

+}

+

+static int

+pipefrom(char *arg)

+{

+	return pipeline(arg, 1, 0);

+}

+

+static int

+pipethrough(char *arg)

+{

+	return pipeline(arg, 1, 1);

+}

+

 /* the entire string is treated as the filename, ie.

  * spaces and any other weird characters will be part

  * of it */

@@ -502,7 +530,7 @@

 	case 'c': return copy(s);

 	case 'd': return cut(s);

 	case 'm': return forcemerge(s);

-	case 'p': return paste(s);

+	case 'p': return dot.from.pos == 0 && dot.to.pos == totalsz ? insert(s) : replace(s);

 //	case 'r': return readfrom(s);

 	case 'w': return writeto(s);

 	case 'x': return crop(s);

@@ -514,8 +542,12 @@

 int

 loadin(int fd)

 {

-	if(readintochunks(fd) == nil)

+	Chunk *c;

+

+	if((c = readintochunks(fd)) == nil)

 		sysfatal("loadin: %r");

+	linkchunk(&norris, c);

+	printchunks(&norris);

 	setrange(0, totalsz);

 	return 0;

 }