# helpers

allvars() {

    for LOCAL_ALLVARS_VAR_PREFIX in _ {a..z} {A..Z}; do

        eval echo -n $\{\!$LOCAL_ALLVARS_VAR_PREFIX*} | sed "s|LOCAL_ALLVARS_VAR_PREFIX||g"

        echo -n " "

    done

}

vars_clear() {

    # local PREFIX=$1

    [ ! -z "$1" ] || return 1

    for VAR in $(allvars); do

        if [[ "$VAR" = $1* ]]; then

            unset $VAR

        fi

    done

}

vars_copy() {

    # local PREFIX_FROM=$1

    # local PREFIX_TO=$2

    # local EXPORT=$3

    [ "$1" == "$2" ] && return 0

    for VAR in $(allvars); do

        if [[ "$VAR" = $1* ]]; then

            if [ "$3" = "export" ]; then

                eval export ${2}${VAR#$1}='${!VAR}'

            else

                eval ${2}${VAR#$1}='${!VAR}'

            fi

        fi

    done

}

vars_rename() {

    # local PREFIX_FROM=$1

    # local PREFIX_TO=$2

    [ ! -z "$1" ] || return 1

    vars_copy "$1" "$2"

    vars_clear "$1"

}

vars_backup() {

    # local PREFIX=$1

    [ ! -z "$1" ] || return 1

    vars_copy "" "$1"

}

vars_restore() {

    # local PREFIX=$1

    # local EXPORT=$2

    [ ! -z "$1" ] || return 1

    vars_copy "$1" "" "$2"

}

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 DIR="$1"

    local COMMAND="$2"

    if [ -z "$DIR" ] || [ ! -e "$DIR" ]; then

        return 1

    fi

    if [ -d "$DIR" ]; then

        for FILE in "$DIR/".*; do

            if [ "$FILE" != "$DIR/." ] && [ "$FILE" != "$DIR/.." ]; then

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

                    return 1

                fi

            fi

        done

        for FILE in "$DIR/"*; do

            if [ "$FILE" != "$DIR" ] && [ "$FILE" != "$DIR/" ]; then

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

                    return 1

                fi

            fi

        done

    fi

}

remove_recursive() {

    local DIR="$1"

    local NEEDLE="$2"

    if [ -d "$DIR" ]; then

        rm -f "$DIR/"$NEEDLE

        if ! foreachfile "$DIR" "${FUNCNAME[0]}" "$NEEDLE"; then

            return 1

        fi

    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

}

sha512dir() {

    local DIR="$1"

    local INFO="$2"

    local BASE=$(basename "$DIR")

    [[ "$BASE" != ".git" ]] || return 0

    [[ "$BASE" != *.po   ]] || return 0

    if [ "$INFO" = "info" ]; then

        basename "$DIR" || return 1

        stat -c%F:%a:%s "$DIR" || return 1

    fi

    if [ -d "$DIR" ]; then

        (foreachfile "$DIR" "${FUNCNAME[0]}" info | sha512sum -b | cut -c1-128) || return 1

    elif [ -L "$DIR" ]; then

        (readlink "$DIR" | sha512sum -b | cut -c1-128) || return 1

    else

        (sha512sum -b "$DIR" | cut -c1-128) || return 1

    fi

}

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

    if ! (ls "$DST_PATH/$SRC_NAME"* &> /dev/null); then

        echo "$SRC_NAME not found in system libraries"

        return 1

    fi

}

add_common_licenses() {

    local FILE="$1"

    local TARGET="$2"

    local LIC_PATH="/usr/share/common-licenses"

    [ -d "$LIC_PATH" ] || return 0

    [[ ! "$FILE" = "$LIC_PATH/"* ]] || return 0

    ls -d1 "$LIC_PATH/"* | while read SUB_FILE; do

        if grep -q "$SUB_FILE" "$FILE"; then

            add_license "$SUB_FILE" "$SUB_FILE" "$TARGET"

        fi

    done

}

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

    add_common_licenses "$FILE" "$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"

        for SUFFIX in "" {0..9} "-"; do

            local SUB_NAME="$SRC_NAME$SUFFIX"

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

                SUB_NAME="$SUB_NAME*"

            fi

            for MASK in "/usr/share/doc/$SUB_NAME/copyright" \

                        "/usr/share/licenses/$SUB_NAME" \

                        "/usr/share/licenses/$SUB_NAME/*" \

                        "/usr/share/doc/$SUB_NAME/*"

            do

                local FOUND=

                ls -d1 $MASK 2>/dev/null | while read FILE; do

                    if [ -f "$FILE" ] && [[ "$FILE" != *.bz2 ]]; then

                        FOUND=1

                        if ! add_license "$FILE" "$FILE" "$TARGET"; then

                            echo "Cannot add license file: $FILE -> $TARGET";

                            return 1

                        fi

                    fi

                done

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

                    break

                fi

            done

            if [ -z "$SUFFIX" ] && [ -f "$TARGET" ]; then

                return 0

            fi

        done

        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

}