Allow disabling Cargo.toml not found error

crates/ra_ide/src/feature_flags.rs

@@ -56,6 +56,7 @@ impl Default for FeatureFlags {
             ("completion.insertion.add-call-parenthesis", true),
             ("completion.enable-postfix", true),
             ("notifications.workspace-loaded", true),
+            ("notifications.cargo-toml-not-found", true),
         ])
     }
 }

crates/ra_lsp_server/src/main_loop.rs

@@ -13,6 +13,7 @@ use lsp_types::{ClientCapabilities, NumberOrString};
 use ra_cargo_watch::{CheckOptions, CheckTask};
 use ra_ide::{Canceled, FeatureFlags, FileId, LibraryData, SourceRootId};
 use ra_prof::profile;
+use ra_project_model::WorkspaceError;
 use ra_vfs::{VfsTask, Watch};
 use relative_path::RelativePathBuf;
 use rustc_hash::FxHashSet;
@@ -62,6 +63,22 @@ pub fn main_loop(
 
     let mut loop_state = LoopState::default();
     let mut world_state = {
+        let feature_flags = {
+            let mut ff = FeatureFlags::default();
+            for (flag, value) in config.feature_flags {
+                if ff.set(flag.as_str(), value).is_err() {
+                    log::error!("unknown feature flag: {:?}", flag);
+                    show_message(
+                        req::MessageType::Error,
+                        format!("unknown feature flag: {:?}", flag),
+                        &connection.sender,
+                    );
+                }
+            }
+            ff
+        };
+        log::info!("feature_flags: {:#?}", feature_flags);
+
         // FIXME: support dynamic workspace loading.
         let workspaces = {
             let mut loaded_workspaces = Vec::new();
@@ -75,7 +92,11 @@ pub fn main_loop(
                     Ok(workspace) => loaded_workspaces.push(workspace),
                     Err(e) => {
                         log::error!("loading workspace failed: {}", e);
-
+                        if let WorkspaceError::CargoTomlNotFound(_) = e {
+                            if !feature_flags.get("notifications.cargo-toml-not-found") {
+                                continue;
+                            }
+                        }
                         show_message(
                             req::MessageType::Error,
                             format!("rust-analyzer failed to load workspace: {}", e),
@@ -136,22 +157,6 @@ pub fn main_loop(
             }
         };
 
-        let feature_flags = {
-            let mut ff = FeatureFlags::default();
-            for (flag, value) in config.feature_flags {
-                if ff.set(flag.as_str(), value).is_err() {
-                    log::error!("unknown feature flag: {:?}", flag);
-                    show_message(
-                        req::MessageType::Error,
-                        format!("unknown feature flag: {:?}", flag),
-                        &connection.sender,
-                    );
-                }
-            }
-            ff
-        };
-        log::info!("feature_flags: {:#?}", feature_flags);
-
         WorldState::new(
             ws_roots,
             workspaces,

crates/ra_project_model/src/lib.rs

@@ -17,12 +17,11 @@ use ra_db::{CrateGraph, CrateId, Edition, Env, FileId};
 use rustc_hash::FxHashMap;
 use serde_json::from_reader;
 
-use crate::workspace_error::WorkspaceError;
-
 pub use crate::{
     cargo_workspace::{CargoFeatures, CargoWorkspace, Package, Target, TargetKind},
     json_project::JsonProject,
     sysroot::Sysroot,
+    workspace_error::WorkspaceError,
 };
 
 #[derive(Debug, Clone)]

docs/user/README.md

@@ -118,6 +118,8 @@ host.
        "completion.enable-postfix": true,
        // Show notification when workspace is fully loaded
        "notifications.workspace-loaded": true,
+       // Show error when no Cargo.toml was found
+       "notifications.cargo-toml-not-found": true,
    }
    ```