4 files changed, 59 insertions, 58 deletions

diff --git a/crates/ra_project_model/Cargo.toml b/crates/ra_project_model/Cargo.toml
index e4a60f4c0..818947014 100644
--- a/crates/ra_project_model/Cargo.toml
+++ b/crates/ra_project_model/Cargo.toml
@@ -18,6 +18,7 @@ ra_cfg = { path = "../ra_cfg" }
 ra_db = { path = "../ra_db" }
 ra_toolchain = { path = "../ra_toolchain" }
 ra_proc_macro =  { path = "../ra_proc_macro" }
+paths =  { path = "../paths" }
 
 serde = { version = "1.0.106", features = ["derive"] }
 serde_json = "1.0.48"
diff --git a/crates/ra_project_model/src/cargo_workspace.rs b/crates/ra_project_model/src/cargo_workspace.rs
index 4b7444039..8ce63ab3c 100644
--- a/crates/ra_project_model/src/cargo_workspace.rs
+++ b/crates/ra_project_model/src/cargo_workspace.rs
@@ -1,14 +1,10 @@
 //! FIXME: write short doc here
 
-use std::{
-    ffi::OsStr,
-    ops,
-    path::{Path, PathBuf},
-    process::Command,
-};
+use std::{ffi::OsStr, ops, path::Path, process::Command};
 
 use anyhow::{Context, Result};
 use cargo_metadata::{BuildScript, CargoOpt, Message, MetadataCommand, PackageId};
+use paths::{AbsPath, AbsPathBuf};
 use ra_arena::{Arena, Idx};
 use ra_db::Edition;
 use rustc_hash::FxHashMap;
@@ -20,11 +16,14 @@ use rustc_hash::FxHashMap;
 /// `CrateGraph`. `CrateGraph` is lower-level: it knows only about the crates,
 /// while this knows about `Packages` & `Targets`: purely cargo-related
 /// concepts.
+///
+/// We use absolute paths here, `cargo metadata` guarantees to always produce
+/// abs paths.
 #[derive(Debug, Clone)]
 pub struct CargoWorkspace {
     packages: Arena<PackageData>,
     targets: Arena<TargetData>,
-    workspace_root: PathBuf,
+    workspace_root: AbsPathBuf,
 }
 
 impl ops::Index<Package> for CargoWorkspace {
@@ -80,15 +79,15 @@ pub type Target = Idx<TargetData>;
 pub struct PackageData {
     pub version: String,
     pub name: String,
-    pub manifest: PathBuf,
+    pub manifest: AbsPathBuf,
     pub targets: Vec<Target>,
     pub is_member: bool,
     pub dependencies: Vec<PackageDependency>,
     pub edition: Edition,
     pub features: Vec<String>,
     pub cfgs: Vec<String>,
-    pub out_dir: Option<PathBuf>,
-    pub proc_macro_dylib_path: Option<PathBuf>,
+    pub out_dir: Option<AbsPathBuf>,
+    pub proc_macro_dylib_path: Option<AbsPathBuf>,
 }
 
 #[derive(Debug, Clone)]
@@ -101,7 +100,7 @@ pub struct PackageDependency {
 pub struct TargetData {
     pub package: Package,
     pub name: String,
-    pub root: PathBuf,
+    pub root: AbsPathBuf,
     pub kind: TargetKind,
     pub is_proc_macro: bool,
 }
@@ -135,7 +134,7 @@ impl TargetKind {
 }
 
 impl PackageData {
-    pub fn root(&self) -> &Path {
+    pub fn root(&self) -> &AbsPath {
         self.manifest.parent().unwrap()
     }
 }
@@ -193,7 +192,7 @@ impl CargoWorkspace {
             let pkg = packages.alloc(PackageData {
                 name,
                 version: version.to_string(),
-                manifest: manifest_path,
+                manifest: AbsPathBuf::assert(manifest_path),
                 targets: Vec::new(),
                 is_member,
                 edition,
@@ -210,7 +209,7 @@ impl CargoWorkspace {
                 let tgt = targets.alloc(TargetData {
                     package: pkg,
                     name: meta_tgt.name,
-                    root: meta_tgt.src_path.clone(),
+                    root: AbsPathBuf::assert(meta_tgt.src_path.clone()),
                     kind: TargetKind::new(meta_tgt.kind.as_slice()),
                     is_proc_macro,
                 });
@@ -246,16 +245,17 @@ impl CargoWorkspace {
             packages[source].features.extend(node.features);
         }
 
-        Ok(CargoWorkspace { packages, targets, workspace_root: meta.workspace_root })
+        let workspace_root = AbsPathBuf::assert(meta.workspace_root);
+        Ok(CargoWorkspace { packages, targets, workspace_root: workspace_root })
     }
 
     pub fn packages<'a>(&'a self) -> impl Iterator<Item = Package> + ExactSizeIterator + 'a {
         self.packages.iter().map(|(id, _pkg)| id)
     }
 
-    pub fn target_by_root(&self, root: &Path) -> Option<Target> {
+    pub fn target_by_root(&self, root: &AbsPath) -> Option<Target> {
         self.packages()
-            .filter_map(|pkg| self[pkg].targets.iter().find(|&&it| self[it].root == root))
+            .filter_map(|pkg| self[pkg].targets.iter().find(|&&it| &self[it].root == root))
             .next()
             .copied()
     }
@@ -279,8 +279,8 @@ impl CargoWorkspace {
 
 #[derive(Debug, Clone, Default)]
 pub struct ExternResources {
-    out_dirs: FxHashMap<PackageId, PathBuf>,
-    proc_dylib_paths: FxHashMap<PackageId, PathBuf>,
+    out_dirs: FxHashMap<PackageId, AbsPathBuf>,
+    proc_dylib_paths: FxHashMap<PackageId, AbsPathBuf>,
     cfgs: FxHashMap<PackageId, Vec<String>>,
 }
 
@@ -308,6 +308,7 @@ pub fn load_extern_resources(
         if let Ok(message) = message {
             match message {
                 Message::BuildScriptExecuted(BuildScript { package_id, out_dir, cfgs, .. }) => {
+                    let out_dir = AbsPathBuf::assert(out_dir);
                     res.out_dirs.insert(package_id.clone(), out_dir);
                     res.cfgs.insert(package_id, cfgs);
                 }
@@ -317,7 +318,8 @@ pub fn load_extern_resources(
                         // Skip rmeta file
                         if let Some(filename) = message.filenames.iter().find(|name| is_dylib(name))
                         {
-                            res.proc_dylib_paths.insert(package_id, filename.clone());
+                            let filename = AbsPathBuf::assert(filename.clone());
+                            res.proc_dylib_paths.insert(package_id, filename);
                         }
                     }
                 }
diff --git a/crates/ra_project_model/src/lib.rs b/crates/ra_project_model/src/lib.rs
index fe3e81689..ac88532f0 100644
--- a/crates/ra_project_model/src/lib.rs
+++ b/crates/ra_project_model/src/lib.rs
@@ -7,11 +7,12 @@ mod sysroot;
 use std::{
     fs::{read_dir, File, ReadDir},
     io::{self, BufReader},
-    path::{Path, PathBuf},
+    path::Path,
     process::{Command, Output},
 };
 
 use anyhow::{bail, Context, Result};
+use paths::{AbsPath, AbsPathBuf};
 use ra_cfg::CfgOptions;
 use ra_db::{CrateGraph, CrateName, Edition, Env, FileId};
 use rustc_hash::{FxHashMap, FxHashSet};
@@ -29,7 +30,7 @@ pub enum ProjectWorkspace {
     /// Project workspace was discovered by running `cargo metadata` and `rustc --print sysroot`.
     Cargo { cargo: CargoWorkspace, sysroot: Sysroot },
     /// Project workspace was manually specified using a `rust-project.json` file.
-    Json { project: JsonProject, project_location: PathBuf },
+    Json { project: JsonProject, project_location: AbsPathBuf },
 }
 
 /// `PackageRoot` describes a package root folder.
@@ -38,22 +39,22 @@ pub enum ProjectWorkspace {
 #[derive(Debug, Clone)]
 pub struct PackageRoot {
     /// Path to the root folder
-    path: PathBuf,
+    path: AbsPathBuf,
     /// Is a member of the current workspace
     is_member: bool,
-    out_dir: Option<PathBuf>,
+    out_dir: Option<AbsPathBuf>,
 }
 impl PackageRoot {
-    pub fn new_member(path: PathBuf) -> PackageRoot {
+    pub fn new_member(path: AbsPathBuf) -> PackageRoot {
         Self { path, is_member: true, out_dir: None }
     }
-    pub fn new_non_member(path: PathBuf) -> PackageRoot {
+    pub fn new_non_member(path: AbsPathBuf) -> PackageRoot {
         Self { path, is_member: false, out_dir: None }
     }
-    pub fn path(&self) -> &Path {
+    pub fn path(&self) -> &AbsPath {
         &self.path
     }
-    pub fn out_dir(&self) -> Option<&Path> {
+    pub fn out_dir(&self) -> Option<&AbsPath> {
         self.out_dir.as_deref()
     }
     pub fn is_member(&self) -> bool {
@@ -63,12 +64,12 @@ impl PackageRoot {
 
 #[derive(Debug, Clone, PartialEq, Eq, Hash, Ord, PartialOrd)]
 pub enum ProjectManifest {
-    ProjectJson(PathBuf),
-    CargoToml(PathBuf),
+    ProjectJson(AbsPathBuf),
+    CargoToml(AbsPathBuf),
 }
 
 impl ProjectManifest {
-    pub fn from_manifest_file(path: PathBuf) -> Result<ProjectManifest> {
+    pub fn from_manifest_file(path: AbsPathBuf) -> Result<ProjectManifest> {
         if path.ends_with("rust-project.json") {
             return Ok(ProjectManifest::ProjectJson(path));
         }
@@ -78,7 +79,7 @@ impl ProjectManifest {
         bail!("project root must point to Cargo.toml or rust-project.json: {}", path.display())
     }
 
-    pub fn discover_single(path: &Path) -> Result<ProjectManifest> {
+    pub fn discover_single(path: &AbsPath) -> Result<ProjectManifest> {
         let mut candidates = ProjectManifest::discover(path)?;
         let res = match candidates.pop() {
             None => bail!("no projects"),
@@ -91,23 +92,23 @@ impl ProjectManifest {
         Ok(res)
     }
 
-    pub fn discover(path: &Path) -> io::Result<Vec<ProjectManifest>> {
+    pub fn discover(path: &AbsPath) -> io::Result<Vec<ProjectManifest>> {
         if let Some(project_json) = find_in_parent_dirs(path, "rust-project.json") {
             return Ok(vec![ProjectManifest::ProjectJson(project_json)]);
         }
         return find_cargo_toml(path)
             .map(|paths| paths.into_iter().map(ProjectManifest::CargoToml).collect());
 
-        fn find_cargo_toml(path: &Path) -> io::Result<Vec<PathBuf>> {
+        fn find_cargo_toml(path: &AbsPath) -> io::Result<Vec<AbsPathBuf>> {
             match find_in_parent_dirs(path, "Cargo.toml") {
                 Some(it) => Ok(vec![it]),
                 None => Ok(find_cargo_toml_in_child_dir(read_dir(path)?)),
             }
         }
 
-        fn find_in_parent_dirs(path: &Path, target_file_name: &str) -> Option<PathBuf> {
+        fn find_in_parent_dirs(path: &AbsPath, target_file_name: &str) -> Option<AbsPathBuf> {
             if path.ends_with(target_file_name) {
-                return Some(path.to_owned());
+                return Some(path.to_path_buf());
             }
 
             let mut curr = Some(path);
@@ -123,17 +124,18 @@ impl ProjectManifest {
             None
         }
 
-        fn find_cargo_toml_in_child_dir(entities: ReadDir) -> Vec<PathBuf> {
+        fn find_cargo_toml_in_child_dir(entities: ReadDir) -> Vec<AbsPathBuf> {
             // Only one level down to avoid cycles the easy way and stop a runaway scan with large projects
             entities
                 .filter_map(Result::ok)
                 .map(|it| it.path().join("Cargo.toml"))
                 .filter(|it| it.exists())
+                .map(AbsPathBuf::assert)
                 .collect()
         }
     }
 
-    pub fn discover_all(paths: &[impl AsRef<Path>]) -> Vec<ProjectManifest> {
+    pub fn discover_all(paths: &[impl AsRef<AbsPath>]) -> Vec<ProjectManifest> {
         let mut res = paths
             .iter()
             .filter_map(|it| ProjectManifest::discover(it.as_ref()).ok())
@@ -158,15 +160,12 @@ impl ProjectWorkspace {
                     format!("Failed to open json file {}", project_json.display())
                 })?;
                 let reader = BufReader::new(file);
-                let project_location = match project_json.parent() {
-                    Some(parent) => PathBuf::from(parent),
-                    None => PathBuf::new(),
-                };
+                let project_location = project_json.parent().unwrap().to_path_buf();
                 ProjectWorkspace::Json {
                     project: from_reader(reader).with_context(|| {
                         format!("Failed to deserialize json file {}", project_json.display())
                     })?,
-                    project_location: project_location,
+                    project_location,
                 }
             }
             ProjectManifest::CargoToml(cargo_toml) => {
@@ -218,13 +217,13 @@ impl ProjectWorkspace {
         }
     }
 
-    pub fn proc_macro_dylib_paths(&self) -> Vec<PathBuf> {
+    pub fn proc_macro_dylib_paths(&self) -> Vec<AbsPathBuf> {
         match self {
-            ProjectWorkspace::Json { project, .. } => project
+            ProjectWorkspace::Json { project, project_location } => project
                 .crates
                 .iter()
                 .filter_map(|krate| krate.proc_macro_dylib_path.as_ref())
-                .cloned()
+                .map(|it| project_location.join(it))
                 .collect(),
             ProjectWorkspace::Cargo { cargo, sysroot: _sysroot } => cargo
                 .packages()
diff --git a/crates/ra_project_model/src/sysroot.rs b/crates/ra_project_model/src/sysroot.rs
index a8a196e64..943ff92df 100644
--- a/crates/ra_project_model/src/sysroot.rs
+++ b/crates/ra_project_model/src/sysroot.rs
@@ -1,15 +1,12 @@
 //! FIXME: write short doc here
 
-use std::{
-    env, ops,
-    path::{Path, PathBuf},
-    process::Command,
-};
+use std::{convert::TryFrom, env, ops, path::Path, process::Command};
 
-use anyhow::{bail, Result};
+use anyhow::{bail, format_err, Result};
 use ra_arena::{Arena, Idx};
 
 use crate::output;
+use paths::{AbsPath, AbsPathBuf};
 
 #[derive(Default, Debug, Clone)]
 pub struct Sysroot {
@@ -21,7 +18,7 @@ pub type SysrootCrate = Idx<SysrootCrateData>;
 #[derive(Debug, Clone)]
 pub struct SysrootCrateData {
     pub name: String,
-    pub root: PathBuf,
+    pub root: AbsPathBuf,
     pub deps: Vec<SysrootCrate>,
 }
 
@@ -53,7 +50,7 @@ impl Sysroot {
         self.crates.iter().map(|(id, _data)| id)
     }
 
-    pub fn discover(cargo_toml: &Path) -> Result<Sysroot> {
+    pub fn discover(cargo_toml: &AbsPath) -> Result<Sysroot> {
         let src = get_or_install_rust_src(cargo_toml)?;
         let mut sysroot = Sysroot { crates: Arena::default() };
         for name in SYSROOT_CRATES.trim().lines() {
@@ -86,16 +83,18 @@ impl Sysroot {
     }
 }
 
-fn get_or_install_rust_src(cargo_toml: &Path) -> Result<PathBuf> {
+fn get_or_install_rust_src(cargo_toml: &AbsPath) -> Result<AbsPathBuf> {
     if let Ok(path) = env::var("RUST_SRC_PATH") {
-        return Ok(path.into());
+        let path = AbsPathBuf::try_from(path.as_str())
+            .map_err(|path| format_err!("RUST_SRC_PATH must be absolute: {}", path.display()))?;
+        return Ok(path);
     }
     let current_dir = cargo_toml.parent().unwrap();
     let mut rustc = Command::new(ra_toolchain::rustc());
     rustc.current_dir(current_dir).args(&["--print", "sysroot"]);
     let rustc_output = output(rustc)?;
     let stdout = String::from_utf8(rustc_output.stdout)?;
-    let sysroot_path = Path::new(stdout.trim());
+    let sysroot_path = AbsPath::assert(Path::new(stdout.trim()));
     let src_path = sysroot_path.join("lib/rustlib/src/rust/src");
 
     if !src_path.exists() {
@@ -116,7 +115,7 @@ fn get_or_install_rust_src(cargo_toml: &Path) -> Result<PathBuf> {
 }
 
 impl SysrootCrateData {
-    pub fn root_dir(&self) -> &Path {
+    pub fn root_dir(&self) -> &AbsPath {
         self.root.parent().unwrap()
     }
 }