Nomad changes

docs/snippets/r/plugins/stateful_plugin.md

@@ -0,0 +1,27 @@
+<!-- snippet:syntax-only -->
+
+```r title="R"
+library(kreuzberg)
+
+# Encapsulate mutable counter state in an environment so the plugin function
+# can update it across calls.
+make_stateful_plugin <- function() {
+  state <- new.env(parent = emptyenv())
+  state$count <- 0L
+
+  process <- function(result) {
+    state$count <- state$count + 1L
+    return(result)
+  }
+
+  list(process = process, count = function() state$count)
+}
+
+plugin <- make_stateful_plugin()
+register_post_processor("stateful_counter", plugin$process)
+
+config <- list(postprocessor = list(enabled = TRUE))
+extract_file_sync("document.pdf", "application/pdf", config)
+
+cat(sprintf("Processed: %d\n", plugin$count()))
+```