Add rust polars version info

R/info.R

@@ -1,3 +1,18 @@
+# get version of rust-polars version from Cargo.lock at package build time
+# from polars 0.31.1 this can be migrated to rust side see
+# https://github.com/pola-rs/polars/pull/9660
+RUST_POLARS_VERSION = (\() {
+  Cargo.lock = readLines("./src/rust/Cargo.lock")
+  polars.idx = which(Cargo.lock == r"{name = "polars"}")[1]
+  this_line = Cargo.lock[polars.idx + 1]
+  if (isTRUE(substr(this_line, 1, 7) == "version")) {
+    return(substr(this_line, 12, nchar(this_line) - 1))
+  }
+  warning("failed to find RUST_POLARS_VERSION version")
+  "unknown"
+})()
+
+
 #' Report information of the package
 #'
 #' @return A list with information of the package
@@ -8,6 +23,7 @@ pl$polars_info = function() {
   # Similar to arrow::arrow_info()
   out = list(
     version = utils::packageVersion("polars"),
+    rust_polars = RUST_POLARS_VERSION,
     features = FeatureInfo$new()$to_r()
   )
 
@@ -27,6 +43,8 @@ print.polars_info = function(x, ...) {
     cat("\n")
   }
 
-  cat("R Polars package version: ", format(x$version), "\n\n", sep = "")
+  cat("r-polars package version : ", format(x$version), "\n", sep = "")
+  cat("rust-polars crate version: ", format(x$rust_polars), "\n", sep = "")
+  cat("\n")
   print_key_values("Features", unlist(x$features))
 }

tests/testthat/_snaps/info.md

@@ -3,7 +3,8 @@
     Code
       info
     Output
-      R Polars package version: 999.999.999
+      r-polars package version : 999.999.999
+      rust-polars crate version: 999.999.999
 
       Features:          
       simd FALSE

tests/testthat/test-info.R

@@ -11,6 +11,7 @@ test_that("print pl$polars_info()", {
 
   # Ensure static version for snapshot test
   info$version <- package_version("999.999.999")
+  info$rust_polars <- package_version("999.999.999")
 
   # Ensure all features are FALSE for snapshot test
   for (feature in names(info$features)) {