make twn run compile it first

tools/twn

@@ -3,17 +3,16 @@
 
 set +e
 
+exe="$(basename $PWD)"
 toolpath="$(dirname -- "${BASH_SOURCE[0]}")"
 export TWNROOT=$(realpath "$toolpath"/../)
 export TWNBUILDDIR=$(realpath "$toolpath"/../.build)
 
-exe="$(basename $PWD)"
-
 case "$1" in
     build    ) "$toolpath"/build.sh "${@:2}"
                ;;
 
-    run      ) ./$exe "${@:2}"
+    run      ) $0 build && ./$exe "${@:2}"
                ;;
 
     gdb      ) unset DEBUGINFOD_URLS