From ebf2c5cd6997eb7a200ff7d79734ff0dfd43a748 Mon Sep 17 00:00:00 2001
From: cinap_lenrek <cinap_lenrek@gmx.de>
Date: Sat, 7 Sep 2013 18:42:40 +0200
Subject: [PATCH] mk: handle rc blocks in shell quote

this is so we cna handle:

foo = `{echo `{echo bar}}

thanks to erik and friedrich psiorz on 9fans for
bringing the issue up.
---
 sys/src/cmd/mk/lex.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/sys/src/cmd/mk/lex.c b/sys/src/cmd/mk/lex.c
index d942918f3..5c4bc99be 100644
--- a/sys/src/cmd/mk/lex.c
+++ b/sys/src/cmd/mk/lex.c
@@ -67,7 +67,7 @@ eof:
 static int
 bquote(Biobuf *bp, Bufblock *buf)
 {
-	int c, line, term;
+	int c, line, term, depth;
 	int start;
 
 	line = mkinline;
@@ -80,9 +80,12 @@ bquote(Biobuf *bp, Bufblock *buf)
 	} else
 		term = '`';		/* sh style */
 
+	depth = 1;
 	start = buf->current-buf->start;
 	for(;c > 0; c = nextrune(bp, 0)){
-		if(c == term){
+		if(c == '{' && term == '}')
+			depth++;
+		if(c == term && --depth == 0){
 			insert(buf, '\n');
 			insert(buf,0);
 			buf->current = buf->start+start;