Update call to read_input_nml and remove unnecessary code. (#161)

* Update call to read_input_nml and remove unnecessary code.

* Removing use of INTERNAL_FILE_NML and cleaning up read_namelist_test_cases to remove unused argument

* deleting duplicate call to read_namelist_test_case_nml in fv_control

* removing commented code in fv_control

model/fv_control.F90

@@ -54,7 +54,6 @@ module fv_control_mod
    use fv_mp_mod,           only: mp_start, domain_decomp, mp_assign_gid, global_nest_domain
    use fv_mp_mod,           only: broadcast_domains, mp_barrier, is_master, setup_master, grids_master_procs, tile_fine
    use fv_mp_mod,           only: MAX_NNEST, MAX_NTILE
-   !use test_cases_mod,      only: test_case, bubble_do, alpha, nsolitons, soliton_Umax, soliton_size
    use test_cases_mod,      only: read_namelist_test_case_nml
    use fv_timing_mod,       only: timing_on, timing_off, timing_init, timing_prt
    use mpp_domains_mod,     only: domain2D
@@ -389,7 +388,7 @@ subroutine fv_control_init(Atm, dt_atmos, this_grid, grids_on_this_pe, p_split)
            Atm(n)%nml_filename = 'input.nml'
         endif
         if (.not. file_exists(Atm(n)%nml_filename)) then
-           call mpp_error(FATAL, "Could not find nested grid namelist "//Atm(n)%nml_filename)
+           call mpp_error(FATAL, "Could not find namelist "//Atm(n)%nml_filename)
         endif
      enddo
 
@@ -445,22 +444,10 @@ subroutine fv_control_init(Atm, dt_atmos, this_grid, grids_on_this_pe, p_split)
 
      call set_namelist_pointers(Atm(this_grid))
      call fv_diag_init_gn(Atm(this_grid))
-#ifdef INTERNAL_FILE_NML
-     if (this_grid .gt. 1) then
-        write(Atm(this_grid)%nml_filename,'(A4, I2.2)') 'nest', this_grid
-        if (.not. file_exists('input_'//trim(Atm(this_grid)%nml_filename)//'.nml')) then
-           call mpp_error(FATAL, "Could not find nested grid namelist "//'input_'//trim(Atm(this_grid)%nml_filename)//'.nml')
-        endif
-     else
-        Atm(this_grid)%nml_filename = ''
-     endif
-     call read_input_nml(Atm(this_grid)%nml_filename) !re-reads into internal namelist
-#endif
+     call read_input_nml(alt_input_nml_path=Atm(this_grid)%nml_filename) !re-reads into internal namelist
      call read_namelist_fv_grid_nml
      call read_namelist_fv_core_nml(Atm(this_grid)) ! do options processing here too?
-     call read_namelist_test_case_nml(Atm(this_grid)%nml_filename)
-     !TODO test_case_nml moved to test_cases
-     call read_namelist_test_case_nml(Atm(this_grid)%nml_filename)
+     call read_namelist_test_case_nml
      call mpp_get_current_pelist(Atm(this_grid)%pelist, commID=commID) ! for commID
      call mp_start(commID,halo_update_type)
 
@@ -1050,7 +1037,6 @@ subroutine read_namelist_fv_core_nml(Atm)
 198    format(A,i2.2,A,i4.4,'x',i4.4,'x',i1.1,'-',f9.3)
 199    format(A,i3.3)
 
-       !if (.not. (nested .or. regional)) alpha = alpha*pi  !TODO for test_case_nml
 
        !allocate(Atm%neststruct%child_grids(size(Atm))) !TODO want to remove
        !Atm(N)%neststruct%child_grids = .false.

tools/fv_diagnostics.F90

@@ -352,20 +352,7 @@ subroutine fv_diag_init(Atm, axes, Time, npx, npy, npz, p_ref)
 #endif
     levs_ave = 0
     levs_ave(1:4) = (/50,400,850,1000/)
-#ifdef INTERNAL_FILE_NML
     read(input_nml_file, nml=fv_diag_plevs_nml,iostat=ios)
-#else
-    inquire (file=trim(Atm(n)%nml_filename), exist=exists)
-    if (.not. exists) then
-      write(errmsg,*) 'fv_diag_plevs_nml: namelist file ',trim(Atm(n)%nml_filename),' does not exist'
-      call mpp_error(FATAL, errmsg)
-    else
-      open (unit=nlunit, file=Atm(n)%nml_filename, READONLY, status='OLD', iostat=ios)
-    endif
-    rewind(nlunit)
-    read (nlunit, nml=fv_diag_plevs_nml, iostat=ios)
-    close (nlunit)
-#endif
     if (nplev > MAX_PLEVS) then
        if (is_master()) then
           print*, ' fv_diagnostics: nplev = ', nplev, ' is too large'

tools/test_cases.F90

@@ -5566,9 +5566,8 @@ subroutine init_double_periodic(u,v,w,pt,delp,q,phis, ps,pe,peln,pk,pkz,  uc,vc,
 
       end subroutine init_double_periodic
 
-      subroutine read_namelist_test_case_nml(nml_filename)
+      subroutine read_namelist_test_case_nml()
 
-        character(*), intent(IN) :: nml_filename
         integer :: ierr, f_unit, unit, ios
         namelist /test_case_nml/test_case, bubble_do, alpha, nsolitons, soliton_Umax, soliton_size, &
              no_wind, gaussian_dt, dt_amp, do_marine_sounding, checker_tr, small_earth_scale, Umean