editors/kakoune: Fix tmux-repl.kak

It fails on FreeBSD and claims that tmux' version is too old even though
tmux >= 2 is installed.

editors/kakoune/Makefile

@@ -2,7 +2,7 @@
 
 PORTNAME=	kakoune
 DISTVERSION=	2018.04.13
-PORTREVISION=	1
+PORTREVISION=	2
 CATEGORIES=	editors
 MASTER_SITES=	https://github.com/mawww/kakoune/releases/download/v${DISTVERSION}/
 
@@ -10,7 +10,7 @@ MAINTAINER=	tobik@FreeBSD.org
 COMMENT=	Modal code editor with a focus on interactivity
 
 LICENSE=	UNLICENSE
-LICENSE_FILE=	${WRKSRC}/../UNLICENSE
+LICENSE_FILE=	${WRKSRC:H}/UNLICENSE
 
 BUILD_DEPENDS=	a2x:textproc/asciidoc
 
@@ -18,6 +18,7 @@ USES=		compiler:c++14-lang gmake ncurses tar:bzip2
 
 DATADIR=	${PREFIX}/share/kak
 DOCSDIR=	${PREFIX}/share/doc/kak
+PATCH_WRKSRC=	${WRKSRC:H}
 WRKSRC_SUBDIR=	src
 
 OPTIONS_DEFINE=	DEBUG DOCS
@@ -33,6 +34,6 @@ post-install:
 	${STRIP_CMD} ${STAGEDIR}${PREFIX}/bin/kak
 
 do-test:
-	@cd ${WRKSRC}/../test && ${SETENV} LC_ALL=en_US.UTF-8 ./run
+	@cd ${WRKSRC:H}/test && ${SETENV} LC_ALL=en_US.UTF-8 ./run
 
 .include <bsd.port.mk>

editors/kakoune/files/patch-rc_extra_tmux-repl.kak

@@ -0,0 +1,20 @@
+tmux-repl fails on FreeBSD and claims that tmux' version is too old even
+though tmux >= 2 is installed.
+
+The expr is only compatible with GNU expr.
+
+https://github.com/mawww/kakoune/pull/2006
+
+--- rc/extra/tmux-repl.kak.orig	2018-04-12 11:28:15 UTC
++++ rc/extra/tmux-repl.kak
+@@ -4,8 +4,8 @@
+ hook global KakBegin .* %{
+     %sh{
+         if [ -n "$TMUX" ]; then
+-            VERSION_TMUX=$(tmux -V)
+-            VERSION_TMUX=$(expr "${VERSION_TMUX}" : 'tmux \([0-9]*\|master\)')
++            VERSION_TMUX=$(tmux -V | cut -d' ' -f2)
++            VERSION_TMUX=${VERSION_TMUX%%.*}
+ 
+             if [ "${VERSION_TMUX}" = "master" ] \
+                 || [ "${VERSION_TMUX}" -ge 2 ]; then