rerun: overwritable buildWebViewerFeatures without analytics

pkgs/by-name/re/rerun/package.nix

@@ -22,6 +22,15 @@
   # passthru
   nix-update-script,
   python3Packages,
+  # Expose features to the user for the wasm web viewer build
+  # So he can easily override them
+  # We omit the "analytics" feature because it is opt-out and not opt-in.
+  # More information can be found in there README:
+  # https://raw.githubusercontent.com/rerun-io/rerun/5a9794990c4903c088ad77174e65eb2573162d97/crates/utils/re_analytics/README.md
+  buildWebViewerFeatures ? [
+    "grpc"
+    "map_view"
+  ],
 }:
 
 rustPlatform.buildRustPackage rec {
@@ -52,6 +61,9 @@ rustPlatform.buildRustPackage rec {
     "nasm"
   ];
 
+  # Forward as a bash environment variable to the preBuild hook
+  inherit buildWebViewerFeatures;
+
   # When web_viewer is compiled, the wasm webviewer first needs to be built
   # If this doesn't exist, the build will fail. More information: https://github.com/rerun-io/rerun/issues/6028
   # The command is taken from https://github.com/rerun-io/rerun/blob/dd025f1384f9944d785d0fb75ca4ca1cd1792f17/pixi.toml#L198C72-L198C187
@@ -59,8 +71,18 @@ rustPlatform.buildRustPackage rec {
   # so that user can easily create an overlay to set cargoBuildFeatures to what he needs
   preBuild = ''
     if [[ " $cargoBuildFeatures " == *" web_viewer "* ]]; then
-      echo "Building with web_viewer feature..."
-      cargo run -p re_dev_tools -- build-web-viewer --no-default-features --features analytics,grpc,map_view --release -g
+      # transform the environment variable that is a space separated list into a comma separated list
+      buildWebViewerFeatures=$(echo $buildWebViewerFeatures | tr ' ' ',')
+      # Create the features option only if there are features to pass
+      buildWebViewerFeaturesCargoOption=""
+      if [[ ! -z "$buildWebViewerFeatures" ]]; then
+        buildWebViewerFeaturesCargoOption="--features $buildWebViewerFeatures"
+        echo "Features passed to the web viewer build: $buildWebViewerFeatures"
+      else
+        echo "No features will be passed to the web viewer build"
+      fi
+      echo "Building the wasm web viewer for rerun's web_viewer feature"
+      cargo run -p re_dev_tools -- build-web-viewer --no-default-features $buildWebViewerFeaturesCargoOption --release -g
     else
       echo "web_viewer feature not enabled, skipping web viewer build."
     fi