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/etc/profile.d/lang.sh
# /etc/profile.d/lang.sh - exports environment variables, and provides fallback
#                          for CJK languages that can't be displayed in console.
#                          Resets the locale if unavailable.

unset LANG_backup

# If unavailable, reset to the default. Do this before reading in any
# explicit user configuration. We simply check if locale emits any
# warnings, and assume that the settings are invalid if it does.
if [ -n "$(/usr/bin/locale 2>&1 1>/dev/null)" ]; then
    [ -z "$LANG" ] || LANG=C.UTF-8
    unset LC_ALL
    LC_CTYPE="C.UTF-8"
    LC_NUMERIC="C.UTF-8"
    LC_TIME="C.UTF-8"
    LC_COLLATE="C.UTF-8"
    LC_MONETARY="C.UTF-8"
    LC_MESSAGES="C.UTF-8"
    LC_PAPER="C.UTF-8"
    LC_NAME="C.UTF-8"
    LC_ADDRESS="C.UTF-8"
    LC_TELEPHONE="C.UTF-8"
    LC_MEASUREMENT="C.UTF-8"
    LC_IDENTIFICATION="C.UTF-8"
else
    LANG_backup="${LANG}"
fi

for config in /etc/locale.conf "${HOME}/.i18n"; do
    if [ -f "${config}" ]; then
        # NOTE: We are using eval & sed here to avoid invoking of any commands & functions from those files.
        if [ -x /usr/bin/sed ]; then
            eval $(/usr/bin/sed -r -e 's/^[[:blank:]]*([[:upper:]_]+)=([[:print:][:digit:]\._-]+|"[[:print:][:digit:]\._-]+")/export \1=\2/;t;d' ${config})
        else
            #but if we don't have sed, let's go old way and source it
            [ -f "${config}" ] && . "${config}"
        fi
    fi
done

if [ -n "${LANG_backup}" ]; then
    LANG="${LANG_backup}"
fi

unset LANG_backup config

# ----------------------------------------------

# The LC_ALL is not supposed to be set in /etc/locale.conf according to 'man 5 locale.conf'.
# If it is set, then we we expect it is user's explicit override (most likely from ~/.i18n file).
# See 'man 7 locale' for more info about LC_ALL.
if [ -n "${LC_ALL}" ]; then
    if [ "${LC_ALL}" != "${LANG}" -a -n "${LANG}" ]; then
        export LC_ALL
    else
        unset LC_ALL
    fi
fi

# The ${LANG} manipulation is necessary only in virtual terminal (a.k.a. console - /dev/tty*):
if [ -n "${LANG}" ] && [ "${TERM}" = 'linux' ] && /usr/bin/tty | /usr/bin/grep --quiet -e '/dev/tty'; then
    if /usr/bin/grep --quiet -E -i -e '^.+\.utf-?8$' <<< "${LANG}"; then
        case ${LANG} in
            ja*)    LANG=en_US.UTF-8 ;;
            ko*)    LANG=en_US.UTF-8 ;;
            si*)    LANG=en_US.UTF-8 ;;
            zh*)    LANG=en_US.UTF-8 ;;
            ar*)    LANG=en_US.UTF-8 ;;
            fa*)    LANG=en_US.UTF-8 ;;
            he*)    LANG=en_US.UTF-8 ;;
            en_IN*) true             ;;
            *_IN*)  LANG=en_US.UTF-8 ;;
        esac
    else
        case ${LANG} in
            ja*)    LANG=en_US ;;
            ko*)    LANG=en_US ;;
            si*)    LANG=en_US ;;
            zh*)    LANG=en_US ;;
            ar*)    LANG=en_US ;;
            fa*)    LANG=en_US ;;
            he*)    LANG=en_US ;;
            en_IN*) true       ;;
            *_IN*)  LANG=en_US ;;
        esac
    fi

    # NOTE: We are not exporting the ${LANG} here again on purpose.
    #       If user starts GUI session from console manually, then
    #       the previously set LANG should be okay to use.
fi
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20:05:06