Add binary to list features

Cargo.toml

@@ -16,6 +16,7 @@ members = [
     "json-depth-checker",
     "benchmarks",
     "fuzzers",
+    "xtask",
 ]
 
 [workspace.package]

xtask/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "xtask"
+version.workspace = true
+authors.workspace = true
+description.workspace = true
+homepage.workspace = true
+readme.workspace = true
+edition.workspace = true
+license.workspace = true
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+cargo_metadata = "0.18.1"
+clap = { version = "4.4.14", features = ["derive"] }

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}")
+}