activate-env

_tdo_devkit_activate() {
    local root platform compiler previous_root remaining segment cleaned separator more

    # Keep activation's working state out of the caller, even on failure.
    unset -f _tdo_devkit_activate
    root=$(
        if [ -n "${BASH_VERSION:-}" ]; then
            filepath=$BASH_SOURCE
        elif [ -n "${ZSH_VERSION:-}" ]; then
            filepath=${(%):-%x}
        elif [ -n "${KSH_VERSION:-}" ]; then
            filepath=${.sh.file}
        elif [ "${0##*/}" = dash ]; then
            filepath=$(lsof -p $$ -Fn | tail -n 1)
            filepath=${filepath#n}
        else
            filepath=$0
        fi
        filepath=$(readlink -f "$filepath") || exit 1
        CDPATH= cd -P -- "$(dirname "$filepath")" && pwd -P
    ) || {
        echo "Error: Activation failed. Cannot locate the DevKit installation." >&2
        return 1
    }

    platform=linux
    case "${MSYSTEM:-}:${OSTYPE:-}" in
        ?*:*|*:*msys*) platform=win ;;
    esac
    compiler="$root/bin/compiler/$platform/armcc"
    if [ "$platform" = win ]; then
        compiler="$compiler.exe"
    fi
    if [ ! -f "$compiler" ] || [ ! -x "$compiler" ]; then
        echo "Error: Activation failed. Compiler is missing or not executable: $compiler." >&2
        return 1
    fi
    if [ ! -d "$root/bin/tools/$platform" ] ||
       [ ! -d "$root/bin/buildtools/$platform" ]; then
        echo "Error: Activation failed. DevKit tool or buildtool directory is missing." >&2
        return 1
    fi

    previous_root=${_TDO_DEVKIT_ACTIVE_ROOT:-${TDO_DEVKIT_PATH:-}}
    remaining=${PATH-}
    cleaned=
    separator=
    # Split explicitly so empty entries, spaces, and wildcard characters survive.
    while :; do
        case "$remaining" in
            *:*) segment=${remaining%%:*}; remaining=${remaining#*:}; more=1 ;;
            *) segment=$remaining; more= ;;
        esac
        case "$segment" in
            "$root/bin/compiler/$platform"|"$root/bin/tools/$platform"|"$root/bin/buildtools/$platform")
                ;;
            "$previous_root/bin/compiler/linux"|"$previous_root/bin/tools/linux"|"$previous_root/bin/buildtools/linux"|"$previous_root/bin/compiler/win"|"$previous_root/bin/tools/win"|"$previous_root/bin/buildtools/win")
                if [ -z "$previous_root" ]; then
                    cleaned="$cleaned$separator$segment"
                    separator=:
                fi
                ;;
            *)
                cleaned="$cleaned$separator$segment"
                separator=:
                ;;
        esac
        [ -n "$more" ] || break
    done

    PATH="$root/bin/buildtools/$platform:$root/bin/tools/$platform:$root/bin/compiler/$platform${separator:+:$cleaned}"
    TDO_DEVKIT_PATH=$root
    _TDO_DEVKIT_ACTIVE_ROOT=$root
    _TDO_DEVKIT_ACTIVE_PLATFORM=$platform
    export PATH TDO_DEVKIT_PATH

    deactivate-env() {
        local root platform remaining segment cleaned separator more

        if [ -z "${_TDO_DEVKIT_ACTIVE_ROOT:-}" ]; then
            echo "3DO development environment not activated."
            return 1
        fi
        root=$_TDO_DEVKIT_ACTIVE_ROOT
        platform=$_TDO_DEVKIT_ACTIVE_PLATFORM
        remaining=${PATH-}
        cleaned=
        separator=
        while :; do
            case "$remaining" in
                *:*) segment=${remaining%%:*}; remaining=${remaining#*:}; more=1 ;;
                *) segment=$remaining; more= ;;
            esac
            case "$segment" in
                "$root/bin/compiler/$platform"|"$root/bin/tools/$platform"|"$root/bin/buildtools/$platform")
                    ;;
                *)
                    cleaned="$cleaned$separator$segment"
                    separator=:
                    ;;
            esac
            [ -n "$more" ] || break
        done
        PATH=$cleaned
        export PATH
        unset TDO_DEVKIT_PATH _TDO_DEVKIT_ACTIVE_ROOT _TDO_DEVKIT_ACTIVE_PLATFORM
        echo "3DO development environment deactivated."
    }

    echo "3DO development environment activated. Run 'deactivate-env' to deactivate."
}

_tdo_devkit_activate