fix to take defaults from current dir

xwords4/android/scripts/getsigs.sh

@@ -1,16 +1,47 @@
 #!/bin/sh
 
+set -e -u
+
+DIR=""
+NODE=""
+
 usage() {
     [ $# -gt 0 ] && echo "Error: $1"
-    echo "usage: $0 <dir> <pkg-node>         "
+    echo "usage: $0 [--dir <dir>] [--node <pkg-node>]         "
     echo "            # e.g. XWords4 or XWords4-dbg and xw4 or xw4_dbg"
     exit 1
 }
 
-[ $# -gt 1 ] || usage "dir and node parameters required"
+while [ $# -gt 1 ]; do
+    case $1 in
+        --dir)
+            shift
+            DIR=$1
+            ;;
+        --node)
+            shift
+            NODE=$1
+            ;;
+        *)
+            usage
+            ;;
+    esac
+    shift
+done
+
+if [ -z "$DIR" ]; then
+    if [ -f ./AndroidManifest.xml ]; then # we're in the right directory
+        DIR=$(basename $(pwd))
+    fi
+fi
+if [ -z "$NODE" ]; then
+    if [ -f ./AndroidManifest.xml ]; then # we're in the right directory
+        NODE=$(grep 'package="org.eehouse.android' AndroidManifest.xml | sed 's,^.*android.\(.*\)",\1,')
+    fi
+fi
+
+[ -n "$DIR" -a -n "$NODE" ] || usage
 
-DIR=$1
-NODE=$2
 
 BASE=$(dirname $0)
 cd $BASE/../${DIR}/bin/classes