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nedmail: set $% to the full path of the current message

--- a/sys/man/1/nedmail

+++ b/sys/man/1/nedmail

@@ -277,6 +277,10 @@

 Print the number of the current message.

 .PD

 .PP

+Shell commands will have environment variable

+.B $%

+set to the full path of the current message.

+.PP

 Here's an example of a mail session that looks at a summary

 of the mail messages, saves away an html file added as an

 attachment to a message and then deletes the message:

--- a/sys/src/cmd/upas/ned/nedmail.c

+++ b/sys/src/cmd/upas/ned/nedmail.c

@@ -177,7 +177,7 @@

 int		mdir2message(Message*);

 char*		extendp(char*, char*);

 char*		parsecmd(char*, Cmd*, Message*, Message*);

-void		system(char*, char**, int);

+void		system(Message*, char*, char**, int);

 int		switchmb(char *, int);

 void		closemb(void);

 Message*	dosingleton(Message*, char*);

@@ -397,7 +397,7 @@

 		av[0] = "fs";

 		av[1] = "-p";

 		av[2] = 0;

-		system("/bin/upas/fs", av, -1);

+		system(nil, "/bin/upas/fs", av, -1);

 	}

 	switchmb(mb, singleton);

@@ -2591,7 +2591,7 @@

 }

 void

-system(char *cmd, char **av, int in)

+system(Message *m, char *cmd, char **av, int in)

 {

 	switch(fork()){

 	case -1:

@@ -2604,6 +2604,8 @@

 		}

 		if(wd[0] != 0)

 			chdir(wd);

+		if(m != nil && strcmp(m->path, ".") != 0)

+			putenv("%", rooted(m->path));

 		exec(cmd, av);

 		eprint("!couldn't exec %s\n", cmd);

 		exits(0);

@@ -2629,7 +2631,7 @@

 	av[1] = "-c";

 	av[2] = c->cmdline;

 	av[3] = 0;

-	system("/bin/rc", av, -1);

+	system(m, "/bin/rc", av, -1);

 //	Bprint(&out, "!\n");

 	return m;

 }

@@ -2655,7 +2657,7 @@

 	av[1] = "-c";

 	av[2] = c->cmdline;

 	av[3] = 0;

-	system("/bin/rc", av, fd);	/* system closes fd */

+	system(m, "/bin/rc", av, fd);	/* system closes fd */

 //	Bprint(&out, "!\n");

 	return m;

 }