Add binary to list features

xtask/src/main.rs

@@ -0,0 +1,41 @@
+use std::collections::HashSet;
+
+use clap::Parser;
+
+/// List features available in the workspace
+#[derive(Parser, Debug)]
+struct ListFeaturesDeriveArgs {
+    /// Feature to exclude from the list. Repeat the argument to exclude multiple features
+    #[arg(short, long)]
+    exclude_feature: Vec<String>,
+}
+
+/// Utilitary commands
+#[derive(Parser, Debug)]
+#[command(author, version, about, long_about)]
+#[command(name = "cargo xtask")]
+#[command(bin_name = "cargo xtask")]
+enum Command {
+    ListFeatures(ListFeaturesDeriveArgs),
+}
+
+fn main() {
+    let args = Command::parse();
+    match args {
+        Command::ListFeatures(args) => list_features(args),
+    }
+}
+
+fn list_features(args: ListFeaturesDeriveArgs) {
+    let exclude_features: HashSet<_> = args.exclude_feature.into_iter().collect();
+    let metadata = cargo_metadata::MetadataCommand::new().no_deps().exec().unwrap();
+    let features: Vec<String> = metadata
+        .packages
+        .iter()
+        .flat_map(|package| package.features.keys())
+        .filter(|feature| !exclude_features.contains(feature.as_str()))
+        .map(|s| s.to_owned())
+        .collect();
+    let features = features.join(" ");
+    println!("{features}")
+}