# helpers

copy() {

    local SRC=$1

    local DEST=$2

    if [ -d "$SRC" ]; then

        if ! mkdir -p $DEST; then

            return 1

        fi

        if [ "$(ls -A $1)" ]; then

            if ! cp --remove-destination -rlP $SRC/* "$DEST/"; then

                return 1

            fi

        fi

    elif [ -f "$SRC" ]; then

        if ! (mkdir -p `dirname $DEST` && cp --remove-destination -l "$SRC" "$DEST"); then

            return 1

        fi

    else

        return 1

    fi

}

foreachfile() {

    local FILE=$1

    local COMMAND=$2

    if [ ! -e "$FILE" ]; then

        return 1

    fi

    if [ -d "$FILE" ]; then    

        ls -1 "$FILE" | while read SUBFILE; do

            if ! $COMMAND "$FILE/$SUBFILE" ${@:3}; then

                return 1

            fi

        done

    fi

}

readdir() {

    local FILE=$1

    if [ -d "$FILE" ]; then

        echo "directory begin"

        ls -1 "$1" | while read SUBFILE; do

            if [ "$SUBFILE" = ".git" ]; then

                continue

            fi

            if [[ "$SUBFILE" == *.po ]]; then

                continue

            fi

            local STAT=`stat -c%F:%a:%s "$FILE/$SUBFILE"`

            echo "$STAT:$SUBFILE"

            readdir "$FILE/$SUBFILE"

        done

        echo "directory end"

    else

        local MD5=`md5sum -b "$FILE"`

        echo "file:${MD5:0:32}"

    fi

}

md5() {

    local FILE=$1

    local MD5=`readdir "$FILE" | md5sum -b`

    echo "${MD5:0:32}"

}

remove_recursive() {

    local CURRENT_PATH="$1"

    local NEEDLE="$2"

    rm -f "$CURRENT_PATH/"$NEEDLE

    for FILE in $CURRENT_PATH; do

        if [ -d "$CURRENT_PATH/$FILE" ]; then

            remove_recursive "$CURRENT_PATH/$FILE" "$NEEDLE"

        fi

    done

}

copy_system_lib() {

    local SRC_NAME=$1

    local DST_PATH=$2

    cp --remove-destination /lib/x86_64-linux-gnu/$SRC_NAME* "$DST_PATH" &> /dev/null \

     || cp --remove-destination /lib/i386-linux-gnu/$SRC_NAME* "$DST_PATH" &> /dev/null \

     || cp --remove-destination /usr/lib/x86_64-linux-gnu/$SRC_NAME* "$DST_PATH" &> /dev/null \

     || cp --remove-destination /usr/lib/i386-linux-gnu/$SRC_NAME* "$DST_PATH" &> /dev/null \

     || (echo "$SRC_NAME not found in system libraries" && return 1)

}

add_license() {

    local FILE="$1"

    local FILE_IN_TITLE="$2"

    local TARGET="$3"

    if [ ! -z "$FILE_IN_TITLE" ]; then

        echo ""                                      >> "$TARGET" || return 1

        echo "-------------------------------------" >> "$TARGET" || return 1

        echo "  File: $FILE_IN_TITLE"                >> "$TARGET" || return 1

        echo "-------------------------------------" >> "$TARGET" || return 1

        echo ""                                      >> "$TARGET" || return 1

    else

        echo ""                                      >> "$TARGET" || return 1

        echo "-------------------------------------" >> "$TARGET" || return 1

        echo ""                                      >> "$TARGET" || return 1

    fi

    cat "$FILE"                                      >> "$TARGET" || return 1

}

copy_system_license() {

    local SRC_NAMES=$1

    local DST_PATH=$2

    local SRC_NAME=

    for SRC_NAME in $SRC_NAMES; do

        rm -f "$DST_PATH/license-$SRC_NAME"

    done

    for SRC_NAME in $SRC_NAMES; do

        local TARGET="$DST_PATH/license-$SRC_NAME"

        local FILE=

        if   [ -f "/usr/share/doc/$SRC_NAME/copyright" ]; then

             FILE="/usr/share/doc/$SRC_NAME/copyright"

        elif [ -d "/usr/share/licenses/$SRC_NAME" ]; then

             FILE="/usr/share/licenses/$SRC_NAME"

        elif [ -d "/usr/share/doc/$SRC_NAME" ]; then

             FILE="/usr/share/doc/$SRC_NAME"

        fi

        if [ -f "$FILE" ]; then

            add_license "$FILE" "$FILE" "$TARGET" || (echo "Cannot add license file: $FILE -> $TARGET"; return 1)

        elif [ -d "$FILE" ]; then

            ls -1 "$FILE" | while read SUBFILE; do

                add_license "$FILE/$SUBFILE" "$FILE/$SUBFILE" "$TARGET" || (echo "Cannot add license file: $FILE/$SUBFILE -> $TARGET"; return 1)

            done

        fi

        if [ -f "$TARGET" ]; then

            return 0

        fi

    done

    echo "Cannot found any license for one of system packages: $SRC_NAMES (for $DST_PATH)"

    return 1

}