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add dump support (thanks phil9)

Mailboxes will be dumped when 'Dump' is run.

--- a/mbox.c

+++ b/mbox.c

@@ -813,7 +813,7 @@

 } 

 static void

-mbmain(void*)

+mbmain(void *cmd)

 {

 	Event *ev;

 	Plumbmsg *psee, *pshow, *psend;

@@ -830,6 +830,7 @@

 	wininit(&mbox, mbox.path);

 	wintagwrite(&mbox, "Put Mail Delmesg Undelmesg Next ");

 	showlist();

+	fprint(mbox.ctl, "dump %s\n", cmd);

 	fprint(mbox.ctl, "clean\n");

 	procrfork(eventread, nil, Stack, RFNOTEG);

 	while(1){

@@ -864,8 +865,19 @@

 void

 threadmain(int argc, char **argv)

 {

+	Fmt fmt;

+	char *cmd;

+	int i;

+

 	mbox.view = Vgroup;

+	fmtstrinit(&fmt);

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

+		fmtprint(&fmt, "%s ", argv[i]);

+	cmd = fmtstrflush(&fmt);

+	if(cmd == nil)

+		sysfatal("out of memory");

+

 	ARGBEGIN{

 	case 'f':

 		maildir = EARGF(usage());

@@ -915,6 +927,6 @@

 		procrfork(plumbsendmail, nil, Stack, RFNOTEG);

 	}

 	threadcreate(execlog, nil, Stack);

-	threadcreate(mbmain, nil, Stack);

+	threadcreate(mbmain, cmd, Stack);

 	threadexits(nil);

 }