Show the merged set of activated features to the user when inheriting from a workspace dependency

Author: Muscraft

src/cargo/ops/cargo_add/dependency.rs

@@ -28,6 +28,8 @@ pub struct Dependency {
     pub features: Option<IndexSet<String>>,
     /// Whether default features are enabled
     pub default_features: Option<bool>,
+    /// List of features inherited from a workspace dependency
+    pub inherited_features: Option<IndexSet<String>>,
 
     /// Where the dependency comes from
     pub source: Option<Source>,
@@ -50,6 +52,7 @@ impl Dependency {
             optional: None,
             features: None,
             default_features: None,
+            inherited_features: None,
             source: None,
             registry: None,
             rename: None,
@@ -152,6 +155,12 @@ impl Dependency {
         self
     }
 
+    /// Set features as an array of string (does some basic parsing)
+    pub fn set_inherited_features(mut self, features: IndexSet<String>) -> Self {
+        self.inherited_features = Some(features);
+        self
+    }
+
     /// Get the dependency source
     pub fn source(&self) -> Option<&Source> {
         self.source.as_ref()
@@ -350,6 +359,7 @@ impl Dependency {
                 features,
                 available_features,
                 optional,
+                inherited_features: None,
             };
             Ok(dep)
         } else {

src/cargo/ops/cargo_add/mod.rs

@@ -106,23 +106,27 @@ pub fn add(workspace: &Workspace<'_>, options: &AddOptions<'_>) -> CargoResult<(
                 )
             }
         }
+
+        let available_features = dep
+            .available_features
+            .keys()
+            .map(|s| s.as_ref())
+            .collect::<BTreeSet<&str>>();
+        let mut unknown_features: Vec<&str> = Vec::new();
         if let Some(req_feats) = dep.features.as_ref() {
             let req_feats: BTreeSet<_> = req_feats.iter().map(|s| s.as_str()).collect();
-
-            let available_features = dep
-                .available_features
-                .keys()
-                .map(|s| s.as_ref())
-                .collect::<BTreeSet<&str>>();
-
-            let mut unknown_features: Vec<&&str> =
-                req_feats.difference(&available_features).collect();
-            unknown_features.sort();
-
-            if !unknown_features.is_empty() {
-                anyhow::bail!("unrecognized features: {unknown_features:?}");
-            }
+            unknown_features.extend(req_feats.difference(&available_features).copied());
         }
+        if let Some(inherited_features) = dep.inherited_features.as_ref() {
+            let inherited_features: BTreeSet<_> =
+                inherited_features.iter().map(|s| s.as_str()).collect();
+            unknown_features.extend(inherited_features.difference(&available_features).copied());
+        }
+        unknown_features.sort();
+        if !unknown_features.is_empty() {
+            anyhow::bail!("unrecognized features: {unknown_features:?}");
+        }
+
         manifest.insert_into_table(&dep_table, &dep)?;
         manifest.gc_dep(dep.toml_key());
     }
@@ -564,6 +568,9 @@ fn populate_available_features(
                 dependency.toml_key(),
                 dep_item,
             )?;
+            if let Some(features) = dep.features.clone() {
+                dependency = dependency.set_inherited_features(features);
+            }
             let query = dep.query(config)?;
             match query {
                 MaybeWorkspace::Workspace(_) => {
@@ -645,6 +652,7 @@ fn print_msg(shell: &mut Shell, dep: &Dependency, section: &[String]) -> CargoRe
     if dep.default_features().unwrap_or(true) {
         activated.insert("default");
     }
+    activated.extend(dep.inherited_features.iter().flatten().map(|s| s.as_str()));
     let mut walk: VecDeque<_> = activated.iter().cloned().collect();
     while let Some(next) = walk.pop_front() {
         walk.extend(

tests/snapshots/add/merge_activated_features.in/Cargo.toml

@@ -0,0 +1,5 @@
+[workspace]
+members = ["primary", "dependency"]
+
+[workspace.dependencies]
+foo = { version = "0.0.0", path = "./dependency", features = ["merge"] }

tests/snapshots/add/merge_activated_features.in/dependency/Cargo.toml

@@ -0,0 +1,14 @@
+[package]
+name = "foo"
+version = "0.0.0"
+
+[features]
+default-base = []
+default-test-base = []
+default-merge-base = []
+default = ["default-base", "default-test-base", "default-merge-base"]
+test-base = []
+test = ["test-base", "default-test-base"]
+merge-base = []
+merge = ["merge-base", "default-merge-base"]
+unrelated = []

tests/snapshots/add/merge_activated_features.in/dependency/src/lib.rs

@@ -0,0 +1,8 @@
+cargo-features = ["workspace-inheritance"]
+
+[package]
+name = "bar"
+version = "0.0.0"
+
+[dependencies]
+foo = { workspace = true, features = ["test"] }

tests/snapshots/add/merge_activated_features.in/primary/Cargo.toml

@@ -0,0 +1,5 @@
+[workspace]
+members = ["primary", "dependency"]
+
+[workspace.dependencies]
+foo = { version = "0.0.0", path = "./dependency", features = ["merge"] }

tests/snapshots/add/merge_activated_features.in/primary/src/lib.rs

@@ -0,0 +1,14 @@
+[package]
+name = "foo"
+version = "0.0.0"
+
+[features]
+default-base = []
+default-test-base = []
+default-merge-base = []
+default = ["default-base", "default-test-base", "default-merge-base"]
+test-base = []
+test = ["test-base", "default-test-base"]
+merge-base = []
+merge = ["merge-base", "default-merge-base"]
+unrelated = []

tests/snapshots/add/merge_activated_features.out/Cargo.toml

@@ -0,0 +1,8 @@
+cargo-features = ["workspace-inheritance"]
+
+[package]
+name = "bar"
+version = "0.0.0"
+
+[dependencies]
+foo = { workspace = true, features = ["test"] }