#include <petsc/private/petscimpl.h> /*I    "petscsys.h"   I*/

/*@
  PetscHasExternalPackage - Determine whether PETSc has been configured with the given package

  Not Collective

  Input Parameter:
. pkg - external package name

  Output Parameter:
. has - `PETSC_TRUE` if PETSc is configured with the given package, else `PETSC_FALSE`.

  Level: intermediate

  Notes:
  This is basically an alternative for `PETSC_HAVE_XXX` whenever a preprocessor macro is not available/desirable, e.g. in Python.

  The external package name pkg is e.g. "hdf5", "yaml", "parmetis".
  It should correspond to the name listed in  `./configure --help`  or e.g. in `PetscViewerType`, `MatPartitioningType`, `MatSolverType`.

  The lookup is case insensitive, i.e. looking for "HDF5" or "hdf5" is the same.

.seealso: `PetscViewerType`, `MatPartitioningType`, `MatSolverType`
@*/
PetscErrorCode PetscHasExternalPackage(const char pkg[], PetscBool *has)
{
  char   pkgstr[128], *loc;
  size_t cnt;

  PetscFunctionBegin;
  PetscAssertPointer(pkg, 1);
  PetscAssertPointer(has, 2);
  PetscCall(PetscSNPrintfCount(pkgstr, sizeof(pkgstr), ":%s:", &cnt, pkg));
  PetscCheck(cnt < sizeof(pkgstr), PETSC_COMM_SELF, PETSC_ERR_SUP, "Package name is too long: \"%s\"", pkg);
  PetscCall(PetscStrtolower(pkgstr));
#if defined(PETSC_HAVE_PACKAGES)
  PetscCall(PetscStrstr(PETSC_HAVE_PACKAGES, pkgstr, &loc));
#else
  #error "PETSC_HAVE_PACKAGES macro undefined. Please reconfigure"
#endif
  *has = loc ? PETSC_TRUE : PETSC_FALSE;
  PetscFunctionReturn(PETSC_SUCCESS);
}
