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Export dot through the environment var %dot

--- a/sam/sam.h

+++ b/sam/sam.h

@@ -272,6 +272,7 @@

 void	moveto(File*, Range);

 File	*newfile(void);

 void	nextmatch(File*, String*, Posn, int);

+Posn nlcount(File *, Posn, Posn);

 void	notifyf(void*, char*);

 void	panic(char*);

 void	printposn(File*, int);

--- a/sam/shell.c

+++ b/sam/shell.c

@@ -10,6 +10,26 @@

 Buffer	cmdbuf;

 int	cmdbufpos;

+static void

+updateenv(File *f)

+{

+	char buf[64], *p;

+	

+	if(f == nil){

+		putenv("%", "");

+		putenv("%dot", "");

+		return;

+	}

+	p = Strtoc(&f->name);

+	putenv("%", p);

+	free(p);

+	snprint(buf, sizeof buf, "%lud %lud %lud",

+		1+nlcount(f, 0, f->dot.r.p1),

+		f->dot.r.p1,

+		f->dot.r.p2);

+	putenv("%dot", buf);

+}

+

 int

 plan9(File *f, int type, String *s, int nest)

 {

@@ -93,7 +113,7 @@

 			close(0);	/* so it won't read from terminal */

 			open("/dev/null", 0);

 		}

-		putenv("%", f == nil ? "" : Strtoc(&f->name));

+		updateenv(f);

 		execl(SHPATH, SH, "-c", Strtoc(&plan9cmd), nil);

 		exits("exec");

 	}