sup-tool script

#!/bin/shSUP_BUILD_DIR="$HOME/src/builds/sup"SUP_BIN_DIR="$SUP_BUILD_DIR/bin"SUP_LIB_DIR="$SUP_BUILD_DIR/lib"ask_for() {    echo "Choose one of the following:" >&2    for command in $@        do echo "    ${command#*/sup-}" >&2    done    exit 1}match_found() {    if [ ! "$2" -a "$1" -a -f "$1" ]        then return 0        else return 1    fi}exec_cmd() {    if [ ! "$2" -a "$1" -a -f "$1" ]; then        echo "Executing $1 $ARGS"        ruby -I $SUP_LIB_DIR -w $1 $ARGS        exit 0    fi}COMMAND="$1"if [ ! "$COMMAND" ]    then ask_for $(ls -1 $SUP_BIN_DIR/sup-*)fishiftARGS="$@"CANDIDATE=$(ls -1 $SUP_BIN_DIR/sup-${COMMAND} 2> /dev/null)if match_found $CANDIDATE    then exec_cmd $CANDIDATEfiCANDIDATES=$(ls -1 $SUP_BIN_DIR/sup-${COMMAND}*)if match_found $CANDIDATES; then    exec_cmd $CANDIDATESelif [ "$CANDIDATES" ]; then    ask_for $CANDIDATES else    ask_for $(ls -1 $SUP_BIN_DIR/sup-*)fi