Accept relative paths in rust-project.json

If a relative path is found as part of Crate.root_module or Root.path,
interpret it as relative to the location of the rust-project.json file.

Author: tweksteen

crates/ra_project_model/src/lib.rs

@@ -29,13 +29,7 @@ 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 },
-}
-
-impl From<JsonProject> for ProjectWorkspace {
-    fn from(project: JsonProject) -> ProjectWorkspace {
-        ProjectWorkspace::Json { project }
-    }
+    Json { project: JsonProject, project_location: PathBuf },
 }
 
 /// `PackageRoot` describes a package root folder.
@@ -164,10 +158,15 @@ 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(),
+                };
                 ProjectWorkspace::Json {
                     project: from_reader(reader).with_context(|| {
                         format!("Failed to deserialize json file {}", project_json.display())
                     })?,
+                    project_location: project_location,
                 }
             }
             ProjectManifest::CargoToml(cargo_toml) => {
@@ -200,9 +199,11 @@ impl ProjectWorkspace {
     /// the root is a member of the current workspace
     pub fn to_roots(&self) -> Vec<PackageRoot> {
         match self {
-            ProjectWorkspace::Json { project } => {
-                project.roots.iter().map(|r| PackageRoot::new_member(r.path.clone())).collect()
-            }
+            ProjectWorkspace::Json { project, project_location } => project
+                .roots
+                .iter()
+                .map(|r| PackageRoot::new_member(project_location.join(&r.path)))
+                .collect(),
             ProjectWorkspace::Cargo { cargo, sysroot } => cargo
                 .packages()
                 .map(|pkg| PackageRoot {
@@ -219,7 +220,7 @@ impl ProjectWorkspace {
 
     pub fn proc_macro_dylib_paths(&self) -> Vec<PathBuf> {
         match self {
-            ProjectWorkspace::Json { project } => project
+            ProjectWorkspace::Json { project, .. } => project
                 .crates
                 .iter()
                 .filter_map(|krate| krate.proc_macro_dylib_path.as_ref())
@@ -235,7 +236,7 @@ impl ProjectWorkspace {
 
     pub fn n_packages(&self) -> usize {
         match self {
-            ProjectWorkspace::Json { project } => project.crates.len(),
+            ProjectWorkspace::Json { project, .. } => project.crates.len(),
             ProjectWorkspace::Cargo { cargo, sysroot } => {
                 cargo.packages().len() + sysroot.crates().len()
             }
@@ -251,13 +252,14 @@ impl ProjectWorkspace {
     ) -> CrateGraph {
         let mut crate_graph = CrateGraph::default();
         match self {
-            ProjectWorkspace::Json { project } => {
+            ProjectWorkspace::Json { project, project_location } => {
                 let crates: FxHashMap<_, _> = project
                     .crates
                     .iter()
                     .enumerate()
                     .filter_map(|(seq_index, krate)| {
-                        let file_id = load(&krate.root_module)?;
+                        let file_path = project_location.join(&krate.root_module);
+                        let file_id = load(&file_path)?;
                         let edition = match krate.edition {
                             json_project::Edition::Edition2015 => Edition::Edition2015,
                             json_project::Edition::Edition2018 => Edition::Edition2018,
@@ -540,7 +542,7 @@ impl ProjectWorkspace {
             ProjectWorkspace::Cargo { cargo, .. } => {
                 Some(cargo.workspace_root()).filter(|root| path.starts_with(root))
             }
-            ProjectWorkspace::Json { project: JsonProject { roots, .. } } => roots
+            ProjectWorkspace::Json { project: JsonProject { roots, .. }, .. } => roots
                 .iter()
                 .find(|root| path.starts_with(&root.path))
                 .map(|root| root.path.as_ref()),

crates/rust-analyzer/src/bin/main.rs

@@ -108,11 +108,11 @@ fn run_server() -> Result<()> {
             config.update(value);
         }
         config.update_caps(&initialize_params.capabilities);
+        let cwd = std::env::current_dir()?;
+        config.root_path =
+            initialize_params.root_uri.and_then(|it| it.to_file_path().ok()).unwrap_or(cwd);
 
         if config.linked_projects.is_empty() {
-            let cwd = std::env::current_dir()?;
-            let root =
-                initialize_params.root_uri.and_then(|it| it.to_file_path().ok()).unwrap_or(cwd);
             let workspace_roots = initialize_params
                 .workspace_folders
                 .map(|workspaces| {
@@ -122,7 +122,7 @@ fn run_server() -> Result<()> {
                         .collect::<Vec<_>>()
                 })
                 .filter(|workspaces| !workspaces.is_empty())
-                .unwrap_or_else(|| vec![root]);
+                .unwrap_or_else(|| vec![config.root_path.clone()]);
 
             config.linked_projects = ProjectManifest::discover_all(&workspace_roots)
                 .into_iter()

crates/rust-analyzer/src/config.rs

@@ -38,12 +38,13 @@ pub struct Config {
 
     pub with_sysroot: bool,
     pub linked_projects: Vec<LinkedProject>,
+    pub root_path: PathBuf,
 }
 
 #[derive(Debug, Clone)]
 pub enum LinkedProject {
     ProjectManifest(ProjectManifest),
-    JsonProject(JsonProject),
+    InlineJsonProject(JsonProject),
 }
 
 impl From<ProjectManifest> for LinkedProject {
@@ -54,7 +55,7 @@ impl From<ProjectManifest> for LinkedProject {
 
 impl From<JsonProject> for LinkedProject {
     fn from(v: JsonProject) -> Self {
-        LinkedProject::JsonProject(v)
+        LinkedProject::InlineJsonProject(v)
     }
 }
 
@@ -167,6 +168,7 @@ impl Default for Config {
             lens: LensConfig::default(),
             hover: HoverConfig::default(),
             linked_projects: Vec::new(),
+            root_path: PathBuf::new(),
         }
     }
 }

crates/rust-analyzer/src/main_loop.rs

@@ -121,7 +121,12 @@ pub fn main_loop(config: Config, connection: Connection) -> Result<()> {
                         })
                         .ok()
                     }
-                    LinkedProject::JsonProject(it) => Some(it.clone().into()),
+                    LinkedProject::InlineJsonProject(it) => {
+                        Some(ra_project_model::ProjectWorkspace::Json {
+                            project: it.clone(),
+                            project_location: config.root_path.clone(),
+                        })
+                    }
                 })
                 .collect::<Vec<_>>()
         };