Make shell client work in OS X:

- use gnu env for `env -0`,
- use filesystem socket.

client/powerline.sh

@@ -1,11 +1,21 @@
 #!/bin/sh
 
+test "${OSTYPE#darwin}" = "${OSTYPE}" && darwin=n || darwin=y
+
 if test "$1" = "--socket" ; then
 	shift
 	ADDRESS="$1"
 	shift
 else
 	ADDRESS="powerline-ipc-${UID:-`id -u`}"
+	test "$darwin" = y && ADDRESS="/tmp/$ADDRESS"
+fi
+
+if test "$darwin" = y; then
+	ENV=genv
+else
+	ENV=env
+	ADDRESS="abstract-client:$ADDRESS"
 fi
 
 # Warning: env -0 does not work in busybox. Consider switching to parsing 
@@ -16,8 +26,8 @@ fi
 		printf '%s\0' "$argv"
 	done
 	printf '%s\0' "$PWD"
-	env -0
-) | socat -lf/dev/null -t 10 - abstract-client:"$ADDRESS"
+	$ENV -0
+) | socat -lf/dev/null -t 10 - "$ADDRESS"
 
 if test $? -ne 0 ; then
 	powerline-render "$@"