1 use std::path::{Path, PathBuf};
3 use cargo_metadata::{MetadataCommand, CargoOpt};
4 use ra_arena::{Arena, RawId, impl_arena_id};
5 use rustc_hash::FxHashMap;
6 use failure::format_err;
10 /// `CargoWorkspace` represents the logical structure of, well, a Cargo
11 /// workspace. It pretty closely mirrors `cargo metadata` output.
13 /// Note that internally, rust analyzer uses a different structure:
14 /// `CrateGraph`. `CrateGraph` is lower-level: it knows only about the crates,
15 /// while this knows about `Pacakges` & `Targets`: purely cargo-related
17 #[derive(Debug, Clone)]
18 pub struct CargoWorkspace {
19 packages: Arena<Package, PackageData>,
20 targets: Arena<Target, TargetData>,
23 #[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
24 pub struct Package(RawId);
25 impl_arena_id!(Package);
27 #[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
28 pub struct Target(RawId);
29 impl_arena_id!(Target);
31 #[derive(Debug, Clone)]
37 dependencies: Vec<PackageDependency>,
40 #[derive(Debug, Clone)]
41 pub struct PackageDependency {
46 #[derive(Debug, Clone)]
54 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
65 fn new(kinds: &[String]) -> TargetKind {
67 return match kind.as_str() {
68 "bin" => TargetKind::Bin,
69 "test" => TargetKind::Test,
70 "bench" => TargetKind::Bench,
71 "example" => TargetKind::Example,
72 _ if kind.contains("lib") => TargetKind::Lib,
81 pub fn name(self, ws: &CargoWorkspace) -> &str {
82 ws.packages[self].name.as_str()
84 pub fn root(self, ws: &CargoWorkspace) -> &Path {
85 ws.packages[self].manifest.parent().unwrap()
87 pub fn targets<'a>(self, ws: &'a CargoWorkspace) -> impl Iterator<Item = Target> + 'a {
88 ws.packages[self].targets.iter().cloned()
91 pub fn is_member(self, ws: &CargoWorkspace) -> bool {
92 ws.packages[self].is_member
94 pub fn dependencies<'a>(
96 ws: &'a CargoWorkspace,
97 ) -> impl Iterator<Item = &'a PackageDependency> + 'a {
98 ws.packages[self].dependencies.iter()
103 pub fn package(self, ws: &CargoWorkspace) -> Package {
106 pub fn name(self, ws: &CargoWorkspace) -> &str {
107 ws.targets[self].name.as_str()
109 pub fn root(self, ws: &CargoWorkspace) -> &Path {
110 ws.targets[self].root.as_path()
112 pub fn kind(self, ws: &CargoWorkspace) -> TargetKind {
113 ws.targets[self].kind
117 impl CargoWorkspace {
118 pub fn from_cargo_metadata(cargo_toml: &Path) -> Result<CargoWorkspace> {
119 let mut meta = MetadataCommand::new();
120 meta.manifest_path(cargo_toml).features(CargoOpt::AllFeatures);
121 if let Some(parent) = cargo_toml.parent() {
122 meta.current_dir(parent);
124 let meta = meta.exec().map_err(|e| format_err!("cargo metadata failed: {}", e))?;
125 let mut pkg_by_id = FxHashMap::default();
126 let mut packages = Arena::default();
127 let mut targets = Arena::default();
129 let ws_members = &meta.workspace_members;
131 for meta_pkg in meta.packages {
132 let is_member = ws_members.contains(&meta_pkg.id);
133 let pkg = packages.alloc(PackageData {
134 name: meta_pkg.name.into(),
135 manifest: meta_pkg.manifest_path.clone(),
138 dependencies: Vec::new(),
140 let pkg_data = &mut packages[pkg];
141 pkg_by_id.insert(meta_pkg.id.clone(), pkg);
142 for meta_tgt in meta_pkg.targets {
143 let tgt = targets.alloc(TargetData {
145 name: meta_tgt.name.into(),
146 root: meta_tgt.src_path.clone(),
147 kind: TargetKind::new(meta_tgt.kind.as_slice()),
149 pkg_data.targets.push(tgt);
152 let resolve = meta.resolve.expect("metadata executed with deps");
153 for node in resolve.nodes {
154 let source = pkg_by_id[&node.id];
155 for dep_node in node.deps {
157 PackageDependency { name: dep_node.name.into(), pkg: pkg_by_id[&dep_node.pkg] };
158 packages[source].dependencies.push(dep);
162 Ok(CargoWorkspace { packages, targets })
165 pub fn packages<'a>(&'a self) -> impl Iterator<Item = Package> + 'a {
166 self.packages.iter().map(|(id, _pkg)| id)
169 pub fn target_by_root(&self, root: &Path) -> Option<Target> {
170 self.packages().filter_map(|pkg| pkg.targets(self).find(|it| it.root(self) == root)).next()