add whatprovides option (via xlocate)

vpm

@@ -210,6 +210,8 @@ usage () {
   t "xbps-remove -v -O"
   echo "autoremove (ar)              - Remove orphaned packages"
   t "xbps-remove -v -O"
+  echo "whatprovides (wp) <file>     - Search for package containing <file>"
+  t "xlocate <pkg>"
   echo "help                         - Show usage information"
   echo "helppager (hp)               - Show usage information (will pipe output to less/more)"
   echo
@@ -536,6 +538,16 @@ case "$arg" in
     fi
   ;;
 
+  whatprovides|wp)
+    if hash xlocate >/dev/null 2>&1; then
+      shift
+      # set -x
+      # xlocate -S "$@"
+      msg "relaying to: \"xlocate $@\" - use xlocate -S to (re-)build cached DB."
+      xlocate "$@"
+    fi
+  ;;
+
   ''|*)
     a="$1"
     if hash "xbps-${a}" >/dev/null 2>&1; then