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vdiff: add support for stripping path elements when plumbing

Git generates patches with spurious leading path elements for
compatibility with Torvalds git; This means that we want to
strip them out when interacting with patches. The '-p'option
add support for this element stripping in git

--- a/sys/man/1/vdiff

+++ b/sys/man/1/vdiff

@@ -6,6 +6,10 @@

 [

 .B -b

 ]

+[

+.B -p

+.I strip

+]

 .SH DESCRIPTION

 .I vdiff

 reads unified diff output from standard input and displays a colored version. Right clicking on a line will send a 

@@ -22,6 +26,13 @@

 The

 .B \-b

 flag changes the color scheme to white text on a black background.

+.PP

+The

+.B \-p

+.I nstrip

+flag removes

+.I nstrip

+path elements from path before plumbing.

 .SH EXAMPLE

 % git/diff |vdiff

 .SH SOURCE

--- a/sys/src/cmd/vdiff.c

+++ b/sys/src/cmd/vdiff.c

@@ -61,17 +61,21 @@

 int lcount;

 int maxlength;

 int Δpan;

+int nstrip;

 const char ellipsis[] = "...";

 void

 plumb(char *f, int l)

 {

-	int fd;

-	char wd[256], addr[300]={0};

+	int fd, i;

+	char *p, wd[256], addr[300]={0};

 	fd = plumbopen("send", OWRITE);

 	if(fd<0)

 		return;

+	for(i = 0; i < nstrip; i++)

+		if((p = strchr(f, '/')) != nil)

+			f = p;

 	getwd(wd, sizeof wd);

 	snprint(addr, sizeof addr, "%s:%d", f, l);

 	plumbsendtext(fd, "vdiff", "edit", wd, addr);

@@ -415,7 +419,7 @@

 void

 usage(void)

 {

-	fprint(2, "%s [-b]\n", argv0);

+	fprint(2, "%s [-b] [-p n]\n", argv0);

 	exits("usage");

 }

@@ -439,6 +443,9 @@

 	ARGBEGIN{

 	case 'b':

 		b = 1;

+		break;

+	case 'p':

+		nstrip = atoi(EARGF(usage()));

 		break;

 	default:

 		usage();