Use reticulate instead of PythonInR, alanwood has moved

Because the pesticide compendium at alanwood.net has moved to bcpc.org,
we need to depend on a development branch of webchem at the moment.

1 files changed, 13 insertions, 0 deletions

diff --git a/R/zzz.R b/R/zzz.R
new file mode 100644
index 0000000..19ca10d
--- /dev/null
+++ b/R/zzz.R
@@ -0,0 +1,13 @@
+.onLoad = function(libname, pkgname) {
+  rdkit_available <- FALSE
+  if(requireNamespace("reticulate", quietly = TRUE)) {
+    rdkit_module <- try(reticulate::import("rdkit"))
+    if (!inherits(rdkit_module, "try-error")) {
+      rdkit_available <- TRUE
+    }
+  }
+  assign('rdkit_available', rdkit_available, envir = topenv())
+  if (rdkit_available) {
+    assign('rdkit_module', rdkit_module, envir = topenv())
+  }
+}