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|
mod cargo_workspace;
mod sysroot;
use std::path::{Path, PathBuf};
use failure::bail;
use rustc_hash::FxHashMap;
use ra_db::{CrateGraph, FileId};
pub use crate::{
cargo_workspace::{CargoWorkspace, Package, Target, TargetKind},
sysroot::Sysroot,
};
// TODO use proper error enum
pub type Result<T> = ::std::result::Result<T, ::failure::Error>;
#[derive(Debug, Clone)]
pub struct ProjectWorkspace {
pub cargo: CargoWorkspace,
pub sysroot: Sysroot,
}
impl ProjectWorkspace {
pub fn discover(path: &Path) -> Result<ProjectWorkspace> {
let cargo_toml = find_cargo_toml(path)?;
let cargo = CargoWorkspace::from_cargo_metadata(&cargo_toml)?;
let sysroot = Sysroot::discover(&cargo_toml)?;
let res = ProjectWorkspace { cargo, sysroot };
Ok(res)
}
pub fn to_crate_graph(&self, load: &mut dyn FnMut(&Path) -> Option<FileId>) -> CrateGraph {
let mut crate_graph = CrateGraph::default();
let mut sysroot_crates = FxHashMap::default();
for krate in self.sysroot.crates() {
if let Some(file_id) = load(krate.root(&self.sysroot)) {
sysroot_crates.insert(krate, crate_graph.add_crate_root(file_id));
}
}
for from in self.sysroot.crates() {
for to in from.deps(&self.sysroot) {
let name = to.name(&self.sysroot);
if let (Some(&from), Some(&to)) =
(sysroot_crates.get(&from), sysroot_crates.get(&to))
{
if let Err(_) = crate_graph.add_dep(from, name.into(), to) {
log::error!("cyclic dependency between sysroot crates")
}
}
}
}
let libstd = self.sysroot.std().and_then(|it| sysroot_crates.get(&it).map(|&it| it));
let mut pkg_to_lib_crate = FxHashMap::default();
let mut pkg_crates = FxHashMap::default();
// Next, create crates for each package, target pair
for pkg in self.cargo.packages() {
let mut lib_tgt = None;
for tgt in pkg.targets(&self.cargo) {
let root = tgt.root(&self.cargo);
if let Some(file_id) = load(root) {
let crate_id = crate_graph.add_crate_root(file_id);
if tgt.kind(&self.cargo) == TargetKind::Lib {
lib_tgt = Some(crate_id);
pkg_to_lib_crate.insert(pkg, crate_id);
}
pkg_crates.entry(pkg).or_insert_with(Vec::new).push(crate_id);
}
}
// Set deps to the std and to the lib target of the current package
for &from in pkg_crates.get(&pkg).into_iter().flatten() {
if let Some(to) = lib_tgt {
if to != from {
if let Err(_) = crate_graph.add_dep(from, pkg.name(&self.cargo).into(), to)
{
log::error!(
"cyclic dependency between targets of {}",
pkg.name(&self.cargo)
)
}
}
}
if let Some(std) = libstd {
if let Err(_) = crate_graph.add_dep(from, "std".into(), std) {
log::error!("cyclic dependency on std for {}", pkg.name(&self.cargo))
}
}
}
}
// Now add a dep ednge from all targets of upstream to the lib
// target of downstream.
for pkg in self.cargo.packages() {
for dep in pkg.dependencies(&self.cargo) {
if let Some(&to) = pkg_to_lib_crate.get(&dep.pkg) {
for &from in pkg_crates.get(&pkg).into_iter().flatten() {
if let Err(_) = crate_graph.add_dep(from, dep.name.clone().into(), to) {
log::error!(
"cyclic dependency {} -> {}",
pkg.name(&self.cargo),
dep.pkg.name(&self.cargo)
)
}
}
}
}
}
crate_graph
}
}
fn find_cargo_toml(path: &Path) -> Result<PathBuf> {
if path.ends_with("Cargo.toml") {
return Ok(path.to_path_buf());
}
let mut curr = Some(path);
while let Some(path) = curr {
let candidate = path.join("Cargo.toml");
if candidate.exists() {
return Ok(candidate);
}
curr = path.parent();
}
bail!("can't find Cargo.toml at {}", path.display())
}
|
