Automatically reload project on config change

Author: matklad

crates/ra_project_model/src/project_json.rs

@@ -10,22 +10,22 @@ use serde::{de, Deserialize};
 use stdx::split_delim;
 
 /// Roots and crates that compose this Rust project.
-#[derive(Clone, Debug)]
+#[derive(Clone, Debug, Eq, PartialEq)]
 pub struct ProjectJson {
     pub(crate) roots: Vec<Root>,
     pub(crate) crates: Vec<Crate>,
 }
 
 /// A root points to the directory which contains Rust crates. rust-analyzer watches all files in
 /// all roots. Roots might be nested.
-#[derive(Clone, Debug)]
+#[derive(Clone, Debug, Eq, PartialEq)]
 pub struct Root {
     pub(crate) path: AbsPathBuf,
 }
 
 /// A crate points to the root module of a crate and lists the dependencies of the crate. This is
 /// useful in creating the crate graph.
-#[derive(Clone, Debug)]
+#[derive(Clone, Debug, Eq, PartialEq)]
 pub struct Crate {
     pub(crate) root_module: AbsPathBuf,
     pub(crate) edition: Edition,

crates/rust-analyzer/src/config.rs

@@ -44,7 +44,7 @@ pub struct Config {
     pub root_path: AbsPathBuf,
 }
 
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, Eq, PartialEq)]
 pub enum LinkedProject {
     ProjectManifest(ProjectManifest),
     InlineJsonProject(ProjectJson),

crates/rust-analyzer/src/reload.rs

@@ -19,11 +19,14 @@ impl GlobalState {
         if self.config.lru_capacity != old_config.lru_capacity {
             self.analysis_host.update_lru_capacity(old_config.lru_capacity);
         }
-        if self.config.flycheck != old_config.flycheck {
+        if self.config.linked_projects != old_config.linked_projects {
+            self.reload()
+        } else if self.config.flycheck != old_config.flycheck {
             self.reload_flycheck();
         }
     }
     pub(crate) fn reload(&mut self) {
+        log::info!("reloading projects: {:?}", self.config.linked_projects);
         let workspaces = {
             if self.config.linked_projects.is_empty()
                 && self.config.notifications.cargo_toml_not_found