Allow user config to not exist

Author: Veykril

src/tools/rust-analyzer/crates/rust-analyzer/src/config.rs

@@ -794,19 +794,17 @@ impl Config {
     /// | Linux   | `$XDG_CONFIG_HOME` or `$HOME`/.config | /home/alice/.config                      |
     /// | macOS   | `$HOME`/Library/Application Support   | /Users/Alice/Library/Application Support |
     /// | Windows | `{FOLDERID_RoamingAppData}`           | C:\Users\Alice\AppData\Roaming           |
-    pub fn user_config_path() -> &'static AbsPath {
-        static USER_CONFIG_PATH: LazyLock<AbsPathBuf> = LazyLock::new(|| {
+    pub fn user_config_path() -> Option<&'static AbsPath> {
+        static USER_CONFIG_PATH: LazyLock<Option<AbsPathBuf>> = LazyLock::new(|| {
             let user_config_path = if let Some(path) = env::var_os("__TEST_RA_USER_CONFIG_DIR") {
                 std::path::PathBuf::from(path)
             } else {
-                dirs::config_dir()
-                    .expect("A config dir is expected to existed on all platforms ra supports.")
-                    .join("rust-analyzer")
+                dirs::config_dir()?.join("rust-analyzer")
             }
             .join("rust-analyzer.toml");
-            AbsPathBuf::assert_utf8(user_config_path)
+            Some(AbsPathBuf::assert_utf8(user_config_path))
         });
-        &USER_CONFIG_PATH
+        USER_CONFIG_PATH.as_deref()
     }
 
     pub fn same_source_root_parent_map(

src/tools/rust-analyzer/crates/rust-analyzer/src/global_state.rs

@@ -399,7 +399,7 @@ impl GlobalState {
                     .collect_vec();
 
                 for (file_id, (_change_kind, vfs_path)) in modified_ratoml_files {
-                    if vfs_path == *user_config_path {
+                    if vfs_path.as_path() == user_config_path {
                         change.change_user_config(Some(db.file_text(file_id)));
                         continue;
                     }

src/tools/rust-analyzer/crates/rust-analyzer/src/reload.rs

@@ -551,11 +551,8 @@ impl GlobalState {
 
             watchers.extend(
                 iter::once(Config::user_config_path())
-                    .chain(
-                        self.workspaces
-                            .iter()
-                            .filter_map(|ws| ws.manifest().map(ManifestPath::as_ref)),
-                    )
+                    .chain(self.workspaces.iter().map(|ws| ws.manifest().map(ManifestPath::as_ref)))
+                    .flatten()
                     .map(|glob_pattern| lsp_types::FileSystemWatcher {
                         glob_pattern: lsp_types::GlobPattern::String(glob_pattern.to_string()),
                         kind: None,

src/tools/rust-analyzer/crates/rust-analyzer/tests/slow-tests/ratoml.rs

@@ -77,7 +77,7 @@ impl RatomlTest {
         let mut spl = spl.into_iter();
         if let Some(first) = spl.next() {
             if first == "$$CONFIG_DIR$$" {
-                path = Config::user_config_path().to_path_buf().into();
+                path = Config::user_config_path().unwrap().to_path_buf().into();
             } else {
                 path = path.join(first);
             }

src/tools/rust-analyzer/crates/rust-analyzer/tests/slow-tests/support.rs

@@ -123,7 +123,7 @@ impl Project<'_> {
                 if config_dir_guard.is_none() {
                     config_dir_guard = Some(CONFIG_DIR_LOCK.lock());
                 }
-                let path = Config::user_config_path().join(&pth['/'.len_utf8()..]);
+                let path = Config::user_config_path().unwrap().join(&pth['/'.len_utf8()..]);
                 fs::create_dir_all(path.parent().unwrap()).unwrap();
                 fs::write(path.as_path(), entry.text.as_bytes()).unwrap();
             } else {