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|
use std::path::{Path, PathBuf};
use cargo_metadata::{MetadataCommand, CargoOpt};
use ra_arena::{Arena, RawId, impl_arena_id};
use rustc_hash::FxHashMap;
use failure::format_err;
use crate::Result;
/// `CargoWorkspace` represents the logical structure of, well, a Cargo
/// workspace. It pretty closely mirrors `cargo metadata` output.
///
/// Note that internally, rust analyzer uses a different structure:
/// `CrateGraph`. `CrateGraph` is lower-level: it knows only about the crates,
/// while this knows about `Pacakges` & `Targets`: purely cargo-related
/// concepts.
#[derive(Debug, Clone)]
pub struct CargoWorkspace {
packages: Arena<Package, PackageData>,
targets: Arena<Target, TargetData>,
}
#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
pub struct Package(RawId);
impl_arena_id!(Package);
#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
pub struct Target(RawId);
impl_arena_id!(Target);
#[derive(Debug, Clone)]
struct PackageData {
name: String,
manifest: PathBuf,
targets: Vec<Target>,
is_member: bool,
dependencies: Vec<PackageDependency>,
}
#[derive(Debug, Clone)]
pub struct PackageDependency {
pub pkg: Package,
pub name: String,
}
#[derive(Debug, Clone)]
struct TargetData {
pkg: Package,
name: String,
root: PathBuf,
kind: TargetKind,
}
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum TargetKind {
Bin,
Lib,
Example,
Test,
Bench,
Other,
}
impl TargetKind {
fn new(kinds: &[String]) -> TargetKind {
for kind in kinds {
return match kind.as_str() {
"bin" => TargetKind::Bin,
"test" => TargetKind::Test,
"bench" => TargetKind::Bench,
"example" => TargetKind::Example,
_ if kind.contains("lib") => TargetKind::Lib,
_ => continue,
};
}
TargetKind::Other
}
}
impl Package {
pub fn name(self, ws: &CargoWorkspace) -> &str {
ws.packages[self].name.as_str()
}
pub fn root(self, ws: &CargoWorkspace) -> &Path {
ws.packages[self].manifest.parent().unwrap()
}
pub fn targets<'a>(self, ws: &'a CargoWorkspace) -> impl Iterator<Item = Target> + 'a {
ws.packages[self].targets.iter().cloned()
}
#[allow(unused)]
pub fn is_member(self, ws: &CargoWorkspace) -> bool {
ws.packages[self].is_member
}
pub fn dependencies<'a>(
self,
ws: &'a CargoWorkspace,
) -> impl Iterator<Item = &'a PackageDependency> + 'a {
ws.packages[self].dependencies.iter()
}
}
impl Target {
pub fn package(self, ws: &CargoWorkspace) -> Package {
ws.targets[self].pkg
}
pub fn name(self, ws: &CargoWorkspace) -> &str {
ws.targets[self].name.as_str()
}
pub fn root(self, ws: &CargoWorkspace) -> &Path {
ws.targets[self].root.as_path()
}
pub fn kind(self, ws: &CargoWorkspace) -> TargetKind {
ws.targets[self].kind
}
}
impl CargoWorkspace {
pub fn from_cargo_metadata(cargo_toml: &Path) -> Result<CargoWorkspace> {
let mut meta = MetadataCommand::new();
meta.manifest_path(cargo_toml).features(CargoOpt::AllFeatures);
if let Some(parent) = cargo_toml.parent() {
meta.current_dir(parent);
}
let meta = meta.exec().map_err(|e| format_err!("cargo metadata failed: {}", e))?;
let mut pkg_by_id = FxHashMap::default();
let mut packages = Arena::default();
let mut targets = Arena::default();
let ws_members = &meta.workspace_members;
for meta_pkg in meta.packages {
let is_member = ws_members.contains(&meta_pkg.id);
let pkg = packages.alloc(PackageData {
name: meta_pkg.name.into(),
manifest: meta_pkg.manifest_path.clone(),
targets: Vec::new(),
is_member,
dependencies: Vec::new(),
});
let pkg_data = &mut packages[pkg];
pkg_by_id.insert(meta_pkg.id.clone(), pkg);
for meta_tgt in meta_pkg.targets {
let tgt = targets.alloc(TargetData {
pkg,
name: meta_tgt.name.into(),
root: meta_tgt.src_path.clone(),
kind: TargetKind::new(meta_tgt.kind.as_slice()),
});
pkg_data.targets.push(tgt);
}
}
let resolve = meta.resolve.expect("metadata executed with deps");
for node in resolve.nodes {
let source = pkg_by_id[&node.id];
for dep_node in node.deps {
let dep =
PackageDependency { name: dep_node.name.into(), pkg: pkg_by_id[&dep_node.pkg] };
packages[source].dependencies.push(dep);
}
}
Ok(CargoWorkspace { packages, targets })
}
pub fn packages<'a>(&'a self) -> impl Iterator<Item = Package> + 'a {
self.packages.iter().map(|(id, _pkg)| id)
}
pub fn target_by_root(&self, root: &Path) -> Option<Target> {
self.packages().filter_map(|pkg| pkg.targets(self).find(|it| it.root(self) == root)).next()
}
}
|
