%global __brp_check_rpaths %{nil}
%global __requires_exclude ^libmpi
%global packname  nabla
%global packver   0.7.2
%global rlibdir   /usr/local/lib/R/library

Name:             R-CRAN-%{packname}
Version:          0.7.2
Release:          1%{?dist}%{?buildtag}
Summary:          Exact Derivatives via Automatic Differentiation

License:          MIT + file LICENSE
URL:              https://cran.r-project.org/package=%{packname}
Source0:          %{url}&version=%{packver}#/%{packname}_%{packver}.tar.gz


BuildRequires:    R-devel >= 4.0.0
Requires:         R-core >= 4.0.0
BuildArch:        noarch
BuildRequires:    R-methods 
BuildRequires:    R-stats 
Requires:         R-methods 
Requires:         R-stats 

%description
Automatic differentiation for R functions written with supported scalar
arithmetic and mathematical operations. Provides a composable derivative
operator D that computes gradients, Hessians, Jacobians, and
arbitrary-order derivative tensors at machine precision. D(D(f)) gives
Hessians, D(D(D(f))) gives third-order tensors for skewness of maximum
likelihood estimators, and so on to higher orders. Supports loops and
executed branches composed of supported operations. Uses nested dual
numbers without finite difference truncation error; floating-point
rounding and conditioning still affect results.

%prep
%setup -q -c -n %{packname}

# fix end of executable files
find -type f -executable -exec grep -Iq . {} \; -exec sed -i -e '$a\' {} \;
# prevent binary stripping
[ -d %{packname}/src ] && find %{packname}/src -type f -exec \
  sed -i 's@/usr/bin/strip@/usr/bin/true@g' {} \; || true
[ -d %{packname}/src ] && find %{packname}/src/Make* -type f -exec \
  sed -i 's@-g0@@g' {} \; || true
# don't allow local prefix in executable scripts
find -type f -executable -exec sed -Ei 's@#!( )*/usr/local/bin@#!/usr/bin@g' {} \;

%build

%install

mkdir -p %{buildroot}%{rlibdir}
%{_bindir}/R CMD INSTALL -l %{buildroot}%{rlibdir} %{packname}
test -d %{packname}/src && (cd %{packname}/src; rm -f *.o *.so)
rm -f %{buildroot}%{rlibdir}/R.css
# remove buildroot from installed files
find %{buildroot}%{rlibdir} -type f -exec sed -i "s@%{buildroot}@@g" {} \;

%files
%{rlibdir}/%{packname}