Add missing file

pineappl_cli/src/export/fastnlo.rs

@@ -0,0 +1,22 @@
+use anyhow::Result;
+use cxx::UniquePtr;
+use lhapdf::Pdf;
+use pineappl::grid::Grid;
+use pineappl_fastnlo::ffi::fastNLOLHAPDF;
+use std::path::Path;
+use std::pin::Pin;
+
+pub fn convert_into_fastnlo(
+    _grid: &Grid,
+    _output: &Path,
+    _discard_non_matching_scales: bool,
+) -> Result<(UniquePtr<fastNLOLHAPDF>, Vec<bool>)> {
+    todo!()
+}
+
+pub fn convolve_fastnlo(_grid: Pin<&mut fastNLOLHAPDF>, conv_funs: &mut [Pdf]) -> Vec<f64> {
+    // TODO: add support for convolving an APPLgrid with two functions
+    assert_eq!(conv_funs.len(), 1);
+
+    todo!()
+}