Enabled required features from examples automatically

src/commands/build/mod.rs

@@ -1,6 +1,8 @@
 //! Provides functionalities to build a Bevy app targeting either native or web platforms.
 
 pub use args::*;
+use cargo_metadata::TargetKind;
+use tracing::debug;
 
 #[cfg(feature = "web")]
 use crate::web::build::build_web;
@@ -47,6 +49,39 @@ pub fn build(args: &mut BuildArgs) -> anyhow::Result<()> {
         args.cargo_args.target_args.example.is_some(),
     );
 
+    // If a specific example was passed, extend the already present features with the
+    // required_features from this example.
+    if let Some(example) = &args.cargo_args.target_args.example
+    // Search in the current workspace packages for an `example` target that matches the given
+    // example name.
+        && let Some(example_target) = metadata
+            .workspace_packages()
+            .iter()
+            .flat_map(|p| p.targets.clone())
+            .find(|t| t.name.as_str() == example && t.kind.contains(&TargetKind::Example))
+    {
+        let required_features = example_target.required_features;
+
+        debug!(
+            "enabling required_features: {:?}, for example: {example}",
+            required_features
+        );
+
+        args.cargo_args
+            .feature_args
+            .features
+            .extend(required_features);
+    }
+    // build `--examples` with all features enabled.
+    else if args.cargo_args.target_args.is_examples {
+        args.cargo_args
+            .feature_args
+            .features
+            .push("--all-features".to_owned());
+
+        debug!("enabling `--all-features` to build all examples");
+    }
+
     #[cfg(feature = "web")]
     if args.is_web() {
         build_web(args, &metadata, &bin_target)?;

src/commands/lint/mod.rs

@@ -1,5 +1,5 @@
 pub use args::*;
-use tracing::error;
+use tracing::{debug, error};
 
 #[cfg(feature = "rustup")]
 use crate::commands::lint::install::install_linter;
@@ -155,6 +155,39 @@ fn build_lint_cmd(args: &mut LintArgs) -> anyhow::Result<CommandExt> {
         }
     }
 
+    // If a specific example was passed, extend the already present features with the
+    // required_features from this example.
+    if let Some(example) = &args.cargo_args.target_args.example
+    // Search in the current workspace packages for an `example` target that matches the given
+    // example name.
+        && let Some(example_target) = metadata
+            .workspace_packages()
+            .iter()
+            .flat_map(|p| p.targets.clone())
+            .find(|t| t.name.as_str() == example && t.kind.contains(&cargo_metadata::TargetKind::Example))
+    {
+        let required_features = example_target.required_features;
+
+        debug!(
+            "enabling required_features: {:?}, for example: {example}",
+            required_features
+        );
+
+        args.cargo_args
+            .feature_args
+            .features
+            .extend(required_features);
+    }
+    // build `--examples` with all features enabled.
+    else if args.cargo_args.target_args.is_examples {
+        args.cargo_args
+            .feature_args
+            .features
+            .push("--all-features".to_owned());
+
+        debug!("enabling `--all-features` to build all examples");
+    }
+
     let cargo_args = args.cargo_args_builder();
 
     cmd.args(cargo_args)

src/commands/run/mod.rs

@@ -1,5 +1,7 @@
 //! Provides functionalities to run a Bevy app targeting either native or web platforms.
 
+use tracing::debug;
+
 pub use self::args::*;
 #[cfg(feature = "web")]
 use crate::web::run::run_web;
@@ -45,6 +47,29 @@ pub fn run(args: &mut RunArgs) -> anyhow::Result<()> {
         args.cargo_args.target_args.example.is_some(),
     );
 
+    // Extend the already present features with the required_features from this example.
+    if let Some(example) = &args.cargo_args.target_args.example
+    // Search in the current workspace packages for an `example` target that matches the given
+    // example name.
+        && let Some(example_target) = metadata
+            .workspace_packages()
+            .iter()
+            .flat_map(|p| p.targets.clone())
+            .find(|t| t.name.as_str() == example && t.kind.contains(&cargo_metadata::TargetKind::Example))
+    {
+        let required_features = example_target.required_features;
+
+        debug!(
+            "enabling required_features: {:?}, for example: {example}",
+            required_features
+        );
+
+        args.cargo_args
+            .feature_args
+            .features
+            .extend(required_features);
+    }
+
     #[cfg(feature = "web")]
     if args.is_web() {
         return run_web(args, &metadata, &bin_target);