read_dist_fn_species_config Subroutine

  subroutine read_dist_fn_species_config(self)
    use file_utils, only: input_unit_exist, get_indexed_namelist_unit
    use mp, only: proc0
    implicit none
    class(dist_fn_species_config_type), intent(in out) :: self
    logical :: exist
    integer :: in_file

    ! Note: When this routine is in the module where these variables live
    ! we shadow the module level variables here. This is intentional to provide
    ! isolation and ensure we can move this routine to another module easily.
    real :: bakdif, fexpi, fexpr

    namelist /dist_fn_species_knobs/ bakdif, fexpi, fexpr

    ! Only proc0 reads from file
    if (.not. proc0) return

    ! First set local variables from current values
    bakdif = self%bakdif
    fexpi = self%fexpi
    fexpr = self%fexpr

    ! Now read in the main namelist
    call get_indexed_namelist_unit(in_file, trim(self%get_name()), self%index, exist)
    if (exist) read(in_file, nml = dist_fn_species_knobs)
    close(unit = in_file)

    ! Now copy from local variables into type members
    self%bakdif = bakdif
    self%fexpi = fexpi
    self%fexpr = fexpr

    self%exist = exist
  end subroutine read_dist_fn_species_config