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git/log: support -n option to restrict log counts

this is useful for scripting, and convenient for
interactive use.

--- a/sys/man/1/git

+++ b/sys/man/1/git

@@ -96,6 +96,10 @@

 .I expr

 ]

 [

+.B -n

+.I count

+]

+[

 .B -s

 ]

 [

@@ -383,6 +387,11 @@

 The

 .I -s

 option shows a summary of the commit, instead of the full message.

+The

+.I -n count

+option stops printing messages after

+.I count

+messages.

 The

 .I -e expr

 option shows commits matching the query expression provided.

--- a/sys/src/cmd/git/log.c

+++ b/sys/src/cmd/git/log.c

@@ -14,6 +14,7 @@

 char	*queryexpr;

 char	*commitid;

 int	shortlog;

+int	msgcount;

 Objset	done;

 Objq	objq;

@@ -180,7 +181,7 @@

 	if((n = resolverefs(&h, q)) == -1)

 		sysfatal("resolve: %r");

-	for(i = 0; i < n; i++){

+	for(i = 0; i < n && msgcount-- > 0; i++){

 		if((o = readobject(h[i])) == nil)

 			sysfatal("read %H: %r", h[i]);

 		show(o);

@@ -206,7 +207,7 @@

 	qinit(&objq);

 	osinit(&done);

 	qput(&objq, o, 0);

-	while(qpop(&objq, &e)){

+	while(qpop(&objq, &e) && msgcount-- > 0){

 		show(e.o);

 		for(i = 0; i < e.o->commit->nparent; i++){

 			if(oshas(&done, e.o->commit->parent[i]))

@@ -242,6 +243,9 @@

 		break;

 	case 's':

 		shortlog++;

+		break;

+	case 'n':

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

 		break;

 	default:

 		usage();