Auto merge of #5576 - matklad:revert-deps, r=alexcrichton

Revert "Auto merge of #5461 - matklad:meta-rename, r=alexcrichton"

This reverts commit d0d3cb5, reversing
changes made to 757112c.

It is unclear if the design is right, see
#5558 (comment)

src/cargo/core/compiler/context/unit_dependencies.rs

@@ -122,7 +122,7 @@ fn compute_deps<'a, 'b, 'cfg>(
             true
         })
     }).filter_map(|(id, _)| match bcx.get_package(id) {
-            Ok(pkg) => pkg.lib_target().map(|t| {
+            Ok(pkg) => pkg.targets().iter().find(|t| t.is_lib()).map(|t| {
                 let mode = check_or_build_mode(&unit.mode, t);
                 let unit = new_unit(bcx, pkg, t, profile_for, unit.kind.for_target(t), mode);
                 Ok((unit, profile_for))
@@ -256,7 +256,7 @@ fn compute_deps_doc<'a, 'cfg>(
     let mut ret = Vec::new();
     for dep in deps {
         let dep = dep?;
-        let lib = match dep.lib_target() {
+        let lib = match dep.targets().iter().find(|t| t.is_lib()) {
             Some(lib) => lib,
             None => continue,
         };

src/cargo/core/package.rs

@@ -129,10 +129,6 @@ impl Package {
     pub fn targets(&self) -> &[Target] {
         self.manifest.targets()
     }
-    /// Get the library target for the package
-    pub fn lib_target(&self) -> Option<&Target> {
-        self.targets().iter().find(|t| t.is_lib())
-    }
     /// Get the current package version
     pub fn version(&self) -> &Version {
         self.package_id().version()

src/cargo/ops/cargo_compile.rs

@@ -542,11 +542,8 @@ fn generate_targets<'a>(
                 proposals.extend(default_units);
                 if build_config.mode == CompileMode::Test {
                     // Include the lib as it will be required for doctests.
-                    match pkg.lib_target() {
-                        Some(t) if t.doctested() => {
-                            proposals.push((new_unit(pkg, t, CompileMode::Build), false));
-                        }
-                        _ => {}
+                    if let Some(t) = pkg.targets().iter().find(|t| t.is_lib() && t.doctested()) {
+                        proposals.push((new_unit(pkg, t, CompileMode::Build), false));
                     }
                 }
             }
@@ -559,7 +556,7 @@ fn generate_targets<'a>(
                 ref benches,
             } => {
                 if lib {
-                    if let Some(target) = pkg.lib_target() {
+                    if let Some(target) = pkg.targets().iter().find(|t| t.is_lib()) {
                         proposals.push((new_unit(pkg, target, build_config.mode), false));
                     } else if !all_targets {
                         bail!("no library targets found")

src/cargo/ops/cargo_output_metadata.rs

@@ -1,6 +1,7 @@
+use serde::ser::{self, Serialize};
+
 use core::resolver::Resolve;
-use core::{Package, PackageId, PackageSet, Workspace};
-use core::dependency;
+use core::{Package, PackageId, Workspace};
 use ops::{self, Packages};
 use util::CargoResult;
 
@@ -55,19 +56,18 @@ fn metadata_full(ws: &Workspace, opt: &OutputMetadataOptions) -> CargoResult<Exp
     )?;
     let (packages, resolve) = deps;
 
-    let resolve = MetadataResolve::new(
-        &packages,
-        &resolve,
-        ws.current_opt().map(|pkg| pkg.package_id().clone()),
-    );
     let packages = packages
         .package_ids()
         .map(|i| packages.get(i).map(|p| p.clone()))
         .collect::<CargoResult<Vec<_>>>()?;
+
     Ok(ExportInfo {
         packages,
         workspace_members: ws.members().map(|pkg| pkg.package_id().clone()).collect(),
-        resolve: Some(resolve),
+        resolve: Some(MetadataResolve {
+            resolve,
+            root: ws.current_opt().map(|pkg| pkg.package_id().clone()),
+        }),
         target_directory: ws.target_dir().display().to_string(),
         version: VERSION,
         workspace_root: ws.root().display().to_string(),
@@ -76,91 +76,42 @@ fn metadata_full(ws: &Workspace, opt: &OutputMetadataOptions) -> CargoResult<Exp
 
 #[derive(Serialize)]
 pub struct ExportInfo {
-    /// All packages for this project, with dependencies.
     packages: Vec<Package>,
-    /// Packages which are direct members of the current project.
     workspace_members: Vec<PackageId>,
-    /// A graph of the dependencies between packages.
     resolve: Option<MetadataResolve>,
-    /// The directory where intermediate build artifacts will be stored.
     target_directory: String,
-    /// Version of this JSON format
     version: u32,
-    /// Path to the directory with the project.
     workspace_root: String,
 }
 
-// The serialization format is different from lockfile, because
-// here we use different format for `PackageId`s, and give more
-// information about dependencies.
+/// Newtype wrapper to provide a custom `Serialize` implementation.
+/// The one from lockfile does not fit because it uses a non-standard
+/// format for `PackageId`s
 #[derive(Serialize)]
 struct MetadataResolve {
-    /// Dependencies for each package from `ExportInfo::package`.
-    nodes: Vec<Node>,
-    /// Deprecated, use `ExportInfo::workspace_members`.
+    #[serde(rename = "nodes", serialize_with = "serialize_resolve")]
+    resolve: Resolve,
     root: Option<PackageId>,
 }
 
-/// Describes dependencies of a single package.
-#[derive(Serialize)]
-struct Node {
-    /// The id of the package.
-    id: PackageId,
-    /// Deprecated, use `deps` field.
-    dependencies: Vec<PackageId>,
-    /// Dependencies of this package.
-    deps: Vec<Dependency>,
-    /// Features, enabled for this package.
-    features: Vec<String>,
-}
-
-/// Describes a single dependency.
-#[derive(Serialize)]
-struct Dependency {
-    /// The id of the dependency.
-    id: PackageId,
-    /// The name used for `extern crate` declaration of this dependency.
-    name: String,
-    /// Is this normal, dev or build dependency
-    kind: dependency::Kind,
-}
-
-impl MetadataResolve {
-    pub fn new(
-        packages: &PackageSet,
-        resolve: &Resolve,
-        root: Option<PackageId>,
-    ) -> MetadataResolve {
-        let nodes = resolve
-            .iter()
-            .map(|pkg| {
-                Node {
-                    id: pkg.clone(),
-                    dependencies: resolve.deps(pkg).map(|(dep, _)| dep.clone()).collect(),
-                    deps: resolve
-                        .deps(pkg)
-                        .flat_map(|(id, deps)| {
-                            let dep_name = packages.get(id).unwrap()
-                                .lib_target().unwrap()
-                                .crate_name();
-                            deps.iter().map(|dep| {
-                                Dependency {
-                                    id: id.clone(),
-                                    name: dep.rename().unwrap_or(&dep_name)
-                                        .to_owned(),
-                                    kind: dep.kind(),
-                                }
-                            }).collect::<Vec<_>>().into_iter()
-                        })
-                        .collect(),
-                    features: resolve
-                        .features_sorted(pkg)
-                        .into_iter()
-                        .map(|s| s.to_string())
-                        .collect(),
-                }
-            })
-            .collect();
-        MetadataResolve { nodes, root }
+fn serialize_resolve<S>(resolve: &Resolve, s: S) -> Result<S::Ok, S::Error>
+where
+    S: ser::Serializer,
+{
+    #[derive(Serialize)]
+    struct Node<'a> {
+        id: &'a PackageId,
+        dependencies: Vec<&'a PackageId>,
+        features: Vec<&'a str>,
     }
+
+    resolve
+        .iter()
+        .map(|id| Node {
+            id,
+            dependencies: resolve.deps(id).map(|p| p.0).collect(),
+            features: resolve.features_sorted(id),
+        })
+        .collect::<Vec<_>>()
+        .serialize(s)
 }