! Example for PetscOptionsInsertFileYAML: Fortran Example
#include <petsc/finclude/petscsys.h>
program main
  use petscsys

  implicit none
  PetscErrorCode                    :: ierr
  character(len=PETSC_MAX_PATH_LEN) :: filename
  PetscBool                         ::  flg

  PetscCallA(PetscInitialize(ierr))
  PetscCallA(PetscOptionsGetString(PETSC_NULL_OPTIONS, PETSC_NULL_CHARACTER, '-f', filename, flg, ierr))
  if (flg) then
    PetscCallA(PetscOptionsInsertFileYAML(PETSC_COMM_WORLD, PETSC_NULL_OPTIONS, filename, PETSC_TRUE, ierr))
  end if

  PetscCallA(PetscOptionsView(PETSC_NULL_OPTIONS, PETSC_VIEWER_STDOUT_WORLD, ierr))
  PetscCallA(PetscFinalize(ierr))

!/*TEST
!
! testset:
!   test:
!      suffix: 1
!      args: -f petsc.yml -options_left 0
!      localrunfiles: petsc.yml
!      output_file: output/ex47_1.out
!
!   test:
!      suffix: 2
!      args: -options_file_yaml petsc.yml -options_left 0
!      localrunfiles: petsc.yml
!      output_file: output/ex47_2.out
!
!TEST*/
end program main