python: Re-land usage of source file path in toolchain picker (#31893)

This reverts commit 1e55e88c18. Closes #ISSUE Release Notes: - Python toolchain selector now uses path to the closest pyproject.toml as a basis for picking a toolchain. All files under the same pyproject.toml (in filesystem hierarchy) will share a single virtual environment. It is possible to have multiple Python virtual environments selected for disjoint parts of the same project.
2025-06-02 18:29:06 +02:00 · 2025-06-02 18:29:06 +02:00 · 9dd18e5ee1
commit 9dd18e5ee1
parent 2ebe16a52f
14 changed files with 195 additions and 92 deletions
--- a/crates/language/src/language.rs
+++ b/crates/language/src/language.rs
@ -34,7 +34,7 @@ pub use highlight_map::HighlightMap;
 use http_client::HttpClient;
 pub use language_registry::{LanguageName, LoadedLanguage};
 use lsp::{CodeActionKind, InitializeParams, LanguageServerBinary, LanguageServerBinaryOptions};
-pub use manifest::{ManifestName, ManifestProvider, ManifestQuery};
+pub use manifest::{ManifestDelegate, ManifestName, ManifestProvider, ManifestQuery};
 use parking_lot::Mutex;
 use regex::Regex;
 use schemars::{
@ -323,7 +323,6 @@ pub trait LspAdapterDelegate: Send + Sync {
    fn http_client(&self) -> Arc<dyn HttpClient>;
    fn worktree_id(&self) -> WorktreeId;
    fn worktree_root_path(&self) -> &Path;
-    fn exists(&self, path: &Path, is_dir: Option<bool>) -> bool;
    fn update_status(&self, language: LanguageServerName, status: BinaryStatus);
    fn registered_lsp_adapters(&self) -> Vec<Arc<dyn LspAdapter>>;
    async fn language_server_download_dir(&self, name: &LanguageServerName) -> Option<Arc<Path>>;
--- a/crates/language/src/manifest.rs
+++ b/crates/language/src/manifest.rs
@ -1,8 +1,7 @@
 use std::{borrow::Borrow, path::Path, sync::Arc};

 use gpui::SharedString;
-
-use crate::LspAdapterDelegate;
+use settings::WorktreeId;

 #[derive(Clone, Debug, PartialEq, Eq, Hash, PartialOrd, Ord)]
 pub struct ManifestName(SharedString);
@ -39,10 +38,15 @@ pub struct ManifestQuery {
    /// Path to the file, relative to worktree root.
    pub path: Arc<Path>,
    pub depth: usize,
-    pub delegate: Arc<dyn LspAdapterDelegate>,
+    pub delegate: Arc<dyn ManifestDelegate>,
 }

 pub trait ManifestProvider {
    fn name(&self) -> ManifestName;
    fn search(&self, query: ManifestQuery) -> Option<Arc<Path>>;
 }
+
+pub trait ManifestDelegate: Send + Sync {
+    fn worktree_id(&self) -> WorktreeId;
+    fn exists(&self, path: &Path, is_dir: Option<bool>) -> bool;
+}
--- a/crates/language/src/toolchain.rs
+++ b/crates/language/src/toolchain.rs
@ -14,7 +14,7 @@ use collections::HashMap;
 use gpui::{AsyncApp, SharedString};
 use settings::WorktreeId;

-use crate::LanguageName;
+use crate::{LanguageName, ManifestName};

 /// Represents a single toolchain.
 #[derive(Clone, Debug)]
@ -44,10 +44,13 @@ pub trait ToolchainLister: Send + Sync {
    async fn list(
        &self,
        worktree_root: PathBuf,
+        subroot_relative_path: Option<Arc<Path>>,
        project_env: Option<HashMap<String, String>>,
    ) -> ToolchainList;
    // Returns a term which we should use in UI to refer to a toolchain.
    fn term(&self) -> SharedString;
+    /// Returns the name of the manifest file for this toolchain.
+    fn manifest_name(&self) -> ManifestName;
 }

 #[async_trait(?Send)]
--- a/crates/languages/src/python.rs
+++ b/crates/languages/src/python.rs
@ -693,9 +693,13 @@ fn get_worktree_venv_declaration(worktree_root: &Path) -> Option<String> {

 #[async_trait]
 impl ToolchainLister for PythonToolchainProvider {
+    fn manifest_name(&self) -> language::ManifestName {
+        ManifestName::from(SharedString::new_static("pyproject.toml"))
+    }
    async fn list(
        &self,
        worktree_root: PathBuf,
+        subroot_relative_path: Option<Arc<Path>>,
        project_env: Option<HashMap<String, String>>,
    ) -> ToolchainList {
        let env = project_env.unwrap_or_default();
@ -706,7 +710,14 @@ impl ToolchainLister for PythonToolchainProvider {
            &environment,
        );
        let mut config = Configuration::default();
-        config.workspace_directories = Some(vec![worktree_root.clone()]);
+
+        let mut directories = vec![worktree_root.clone()];
+        if let Some(subroot_relative_path) = subroot_relative_path {
+            debug_assert!(subroot_relative_path.is_relative());
+            directories.push(worktree_root.join(subroot_relative_path));
+        }
+
+        config.workspace_directories = Some(directories);
        for locator in locators.iter() {
            locator.configure(&config);
        }
--- a/crates/project/src/lsp_store.rs
+++ b/crates/project/src/lsp_store.rs
@ -10,7 +10,8 @@ use crate::{
    lsp_command::{self, *},
    lsp_store,
    manifest_tree::{
-        AdapterQuery, LanguageServerTree, LanguageServerTreeNode, LaunchDisposition, ManifestTree,
+        AdapterQuery, LanguageServerTree, LanguageServerTreeNode, LaunchDisposition,
+        ManifestQueryDelegate, ManifestTree,
    },
    prettier_store::{self, PrettierStore, PrettierStoreEvent},
    project_settings::{LspSettings, ProjectSettings},
@ -1036,7 +1037,7 @@ impl LocalLspStore {
        else {
            return Vec::new();
        };
-        let delegate = LocalLspAdapterDelegate::from_local_lsp(self, &worktree, cx);
+        let delegate = Arc::new(ManifestQueryDelegate::new(worktree.read(cx).snapshot()));
        let root = self.lsp_tree.update(cx, |this, cx| {
            this.get(
                project_path,
@ -2290,7 +2291,8 @@ impl LocalLspStore {
            })
            .map(|(delegate, servers)| (true, delegate, servers))
            .unwrap_or_else(|| {
-                let delegate = LocalLspAdapterDelegate::from_local_lsp(self, &worktree, cx);
+                let lsp_delegate = LocalLspAdapterDelegate::from_local_lsp(self, &worktree, cx);
+                let delegate = Arc::new(ManifestQueryDelegate::new(worktree.read(cx).snapshot()));
                let servers = self
                    .lsp_tree
                    .clone()
@ -2304,7 +2306,7 @@ impl LocalLspStore {
                            )
                            .collect::<Vec<_>>()
                    });
-                (false, delegate, servers)
+                (false, lsp_delegate, servers)
            });
        let servers = servers
            .into_iter()
@ -3585,6 +3587,7 @@ impl LspStore {
        prettier_store: Entity<PrettierStore>,
        toolchain_store: Entity<ToolchainStore>,
        environment: Entity<ProjectEnvironment>,
+        manifest_tree: Entity<ManifestTree>,
        languages: Arc<LanguageRegistry>,
        http_client: Arc<dyn HttpClient>,
        fs: Arc<dyn Fs>,
@ -3618,7 +3621,7 @@ impl LspStore {
                sender,
            )
        };
-        let manifest_tree = ManifestTree::new(worktree_store.clone(), cx);
+
        Self {
            mode: LspStoreMode::Local(LocalLspStore {
                weak: cx.weak_entity(),
@ -4465,10 +4468,13 @@ impl LspStore {
                            )
                            .map(|(delegate, servers)| (true, delegate, servers))
                            .or_else(|| {
-                                let delegate = adapters
+                                let lsp_delegate = adapters
                                    .entry(worktree_id)
                                    .or_insert_with(|| get_adapter(worktree_id, cx))
                                    .clone()?;
+                                let delegate = Arc::new(ManifestQueryDelegate::new(
+                                    worktree.read(cx).snapshot(),
+                                ));
                                let path = file
                                    .path()
                                    .parent()
@ -4483,7 +4489,7 @@ impl LspStore {
                                    cx,
                                );

-                                Some((false, delegate, nodes.collect()))
+                                Some((false, lsp_delegate, nodes.collect()))
                            })
                        else {
                            continue;
@ -6476,7 +6482,7 @@ impl LspStore {
                worktree_id,
                path: Arc::from("".as_ref()),
            };
-            let delegate = LocalLspAdapterDelegate::from_local_lsp(local, &worktree, cx);
+            let delegate = Arc::new(ManifestQueryDelegate::new(worktree.read(cx).snapshot()));
            local.lsp_tree.update(cx, |language_server_tree, cx| {
                for node in language_server_tree.get(
                    path,
@ -10204,14 +10210,6 @@ impl LspAdapterDelegate for LocalLspAdapterDelegate {
        self.worktree.id()
    }

-    fn exists(&self, path: &Path, is_dir: Option<bool>) -> bool {
-        self.worktree.entry_for_path(path).map_or(false, |entry| {
-            is_dir.map_or(true, |is_required_to_be_dir| {
-                is_required_to_be_dir == entry.is_dir()
-            })
-        })
-    }
-
    fn worktree_root_path(&self) -> &Path {
        self.worktree.abs_path().as_ref()
    }
--- a/crates/project/src/manifest_tree.rs
+++ b/crates/project/src/manifest_tree.rs
@ -11,16 +11,17 @@ use std::{
    borrow::Borrow,
    collections::{BTreeMap, hash_map::Entry},
    ops::ControlFlow,
+    path::Path,
    sync::Arc,
 };

 use collections::HashMap;
 use gpui::{App, AppContext as _, Context, Entity, EventEmitter, Subscription};
-use language::{LspAdapterDelegate, ManifestName, ManifestQuery};
+use language::{ManifestDelegate, ManifestName, ManifestQuery};
 pub use manifest_store::ManifestProviders;
 use path_trie::{LabelPresence, RootPathTrie, TriePath};
 use settings::{SettingsStore, WorktreeId};
-use worktree::{Event as WorktreeEvent, Worktree};
+use worktree::{Event as WorktreeEvent, Snapshot, Worktree};

 use crate::{
    ProjectPath,
@ -89,7 +90,7 @@ pub(crate) enum ManifestTreeEvent {
 impl EventEmitter<ManifestTreeEvent> for ManifestTree {}

 impl ManifestTree {
-    pub(crate) fn new(worktree_store: Entity<WorktreeStore>, cx: &mut App) -> Entity<Self> {
+    pub fn new(worktree_store: Entity<WorktreeStore>, cx: &mut App) -> Entity<Self> {
        cx.new(|cx| Self {
            root_points: Default::default(),
            _subscriptions: [
@ -106,11 +107,11 @@ impl ManifestTree {
            worktree_store,
        })
    }
-    fn root_for_path(
+    pub(crate) fn root_for_path(
        &mut self,
        ProjectPath { worktree_id, path }: ProjectPath,
        manifests: &mut dyn Iterator<Item = ManifestName>,
-        delegate: Arc<dyn LspAdapterDelegate>,
+        delegate: Arc<dyn ManifestDelegate>,
        cx: &mut App,
    ) -> BTreeMap<ManifestName, ProjectPath> {
        debug_assert_eq!(delegate.worktree_id(), worktree_id);
@ -218,3 +219,26 @@ impl ManifestTree {
        }
    }
 }
+
+pub(crate) struct ManifestQueryDelegate {
+    worktree: Snapshot,
+}
+impl ManifestQueryDelegate {
+    pub fn new(worktree: Snapshot) -> Self {
+        Self { worktree }
+    }
+}
+
+impl ManifestDelegate for ManifestQueryDelegate {
+    fn exists(&self, path: &Path, is_dir: Option<bool>) -> bool {
+        self.worktree.entry_for_path(path).map_or(false, |entry| {
+            is_dir.map_or(true, |is_required_to_be_dir| {
+                is_required_to_be_dir == entry.is_dir()
+            })
+        })
+    }
+
+    fn worktree_id(&self) -> WorktreeId {
+        self.worktree.id()
+    }
+}
--- a/crates/project/src/manifest_tree/server_tree.rs
+++ b/crates/project/src/manifest_tree/server_tree.rs
@ -16,7 +16,7 @@ use std::{
 use collections::{HashMap, IndexMap};
 use gpui::{App, AppContext as _, Entity, Subscription};
 use language::{
-    Attach, CachedLspAdapter, LanguageName, LanguageRegistry, LspAdapterDelegate,
+    Attach, CachedLspAdapter, LanguageName, LanguageRegistry, ManifestDelegate,
    language_settings::AllLanguageSettings,
 };
 use lsp::LanguageServerName;
@ -151,7 +151,7 @@ impl LanguageServerTree {
        &'a mut self,
        path: ProjectPath,
        query: AdapterQuery<'_>,
-        delegate: Arc<dyn LspAdapterDelegate>,
+        delegate: Arc<dyn ManifestDelegate>,
        cx: &mut App,
    ) -> impl Iterator<Item = LanguageServerTreeNode> + 'a {
        let settings_location = SettingsLocation {
@ -181,7 +181,7 @@ impl LanguageServerTree {
            LanguageServerName,
            (LspSettings, BTreeSet<LanguageName>, Arc<CachedLspAdapter>),
        >,
-        delegate: Arc<dyn LspAdapterDelegate>,
+        delegate: Arc<dyn ManifestDelegate>,
        cx: &mut App,
    ) -> impl Iterator<Item = LanguageServerTreeNode> + 'a {
        let worktree_id = path.worktree_id;
@ -401,7 +401,7 @@ impl<'tree> ServerTreeRebase<'tree> {
        &'a mut self,
        path: ProjectPath,
        query: AdapterQuery<'_>,
-        delegate: Arc<dyn LspAdapterDelegate>,
+        delegate: Arc<dyn ManifestDelegate>,
        cx: &mut App,
    ) -> impl Iterator<Item = LanguageServerTreeNode> + 'a {
        let settings_location = SettingsLocation {
--- a/crates/project/src/project.rs
+++ b/crates/project/src/project.rs
@ -35,6 +35,7 @@ pub use git_store::{
    ConflictRegion, ConflictSet, ConflictSetSnapshot, ConflictSetUpdate,
    git_traversal::{ChildEntriesGitIter, GitEntry, GitEntryRef, GitTraversal},
 };
+pub use manifest_tree::ManifestTree;

 use anyhow::{Context as _, Result, anyhow};
 use buffer_store::{BufferStore, BufferStoreEvent};
@ -874,11 +875,13 @@ impl Project {
                cx.new(|cx| ContextServerStore::new(worktree_store.clone(), cx));

            let environment = cx.new(|_| ProjectEnvironment::new(env));
+            let manifest_tree = ManifestTree::new(worktree_store.clone(), cx);
            let toolchain_store = cx.new(|cx| {
                ToolchainStore::local(
                    languages.clone(),
                    worktree_store.clone(),
                    environment.clone(),
+                    manifest_tree.clone(),
                    cx,
                )
            });
@ -946,6 +949,7 @@ impl Project {
                    prettier_store.clone(),
                    toolchain_store.clone(),
                    environment.clone(),
+                    manifest_tree,
                    languages.clone(),
                    client.http_client(),
                    fs.clone(),
@ -3084,14 +3088,11 @@ impl Project {
        path: ProjectPath,
        language_name: LanguageName,
        cx: &App,
-    ) -> Task<Option<ToolchainList>> {
-        if let Some(toolchain_store) = self.toolchain_store.clone() {
+    ) -> Task<Option<(ToolchainList, Arc<Path>)>> {
+        if let Some(toolchain_store) = self.toolchain_store.as_ref().map(Entity::downgrade) {
            cx.spawn(async move |cx| {
-                cx.update(|cx| {
                toolchain_store
-                        .read(cx)
-                        .list_toolchains(path, language_name, cx)
-                })
+                    .update(cx, |this, cx| this.list_toolchains(path, language_name, cx))
                    .ok()?
                    .await
            })
--- a/crates/project/src/toolchain_store.rs
+++ b/crates/project/src/toolchain_store.rs
@ -19,7 +19,11 @@ use rpc::{
 use settings::WorktreeId;
 use util::ResultExt as _;

-use crate::{ProjectEnvironment, ProjectPath, worktree_store::WorktreeStore};
+use crate::{
+    ProjectEnvironment, ProjectPath,
+    manifest_tree::{ManifestQueryDelegate, ManifestTree},
+    worktree_store::WorktreeStore,
+};

 pub struct ToolchainStore(ToolchainStoreInner);
 enum ToolchainStoreInner {
@ -42,6 +46,7 @@ impl ToolchainStore {
        languages: Arc<LanguageRegistry>,
        worktree_store: Entity<WorktreeStore>,
        project_environment: Entity<ProjectEnvironment>,
+        manifest_tree: Entity<ManifestTree>,
        cx: &mut Context<Self>,
    ) -> Self {
        let entity = cx.new(|_| LocalToolchainStore {
@ -49,6 +54,7 @@ impl ToolchainStore {
            worktree_store,
            project_environment,
            active_toolchains: Default::default(),
+            manifest_tree,
        });
        let subscription = cx.subscribe(&entity, |_, _, e: &ToolchainStoreEvent, cx| {
            cx.emit(e.clone())
@ -80,11 +86,11 @@ impl ToolchainStore {
        &self,
        path: ProjectPath,
        language_name: LanguageName,
-        cx: &App,
-    ) -> Task<Option<ToolchainList>> {
+        cx: &mut Context<Self>,
+    ) -> Task<Option<(ToolchainList, Arc<Path>)>> {
        match &self.0 {
            ToolchainStoreInner::Local(local, _) => {
-                local.read(cx).list_toolchains(path, language_name, cx)
+                local.update(cx, |this, cx| this.list_toolchains(path, language_name, cx))
            }
            ToolchainStoreInner::Remote(remote) => {
                remote.read(cx).list_toolchains(path, language_name, cx)
@ -181,7 +187,7 @@ impl ToolchainStore {
            })?
            .await;
        let has_values = toolchains.is_some();
-        let groups = if let Some(toolchains) = &toolchains {
+        let groups = if let Some((toolchains, _)) = &toolchains {
            toolchains
                .groups
                .iter()
@ -195,8 +201,8 @@ impl ToolchainStore {
        } else {
            vec![]
        };
-        let toolchains = if let Some(toolchains) = toolchains {
-            toolchains
+        let (toolchains, relative_path) = if let Some((toolchains, relative_path)) = toolchains {
+            let toolchains = toolchains
                .toolchains
                .into_iter()
                .map(|toolchain| {
@ -207,15 +213,17 @@ impl ToolchainStore {
                        raw_json: toolchain.as_json.to_string(),
                    }
                })
-                .collect::<Vec<_>>()
+                .collect::<Vec<_>>();
+            (toolchains, relative_path)
        } else {
-            vec![]
+            (vec![], Arc::from(Path::new("")))
        };

        Ok(proto::ListToolchainsResponse {
            has_values,
            toolchains,
            groups,
+            relative_worktree_path: Some(relative_path.to_string_lossy().into_owned()),
        })
    }
    pub fn as_language_toolchain_store(&self) -> Arc<dyn LanguageToolchainStore> {
@ -231,6 +239,7 @@ struct LocalToolchainStore {
    worktree_store: Entity<WorktreeStore>,
    project_environment: Entity<ProjectEnvironment>,
    active_toolchains: BTreeMap<(WorktreeId, LanguageName), BTreeMap<Arc<Path>, Toolchain>>,
+    manifest_tree: Entity<ManifestTree>,
 }

 #[async_trait(?Send)]
@ -312,36 +321,73 @@ impl LocalToolchainStore {
        })
    }
    pub(crate) fn list_toolchains(
-        &self,
+        &mut self,
        path: ProjectPath,
        language_name: LanguageName,
-        cx: &App,
-    ) -> Task<Option<ToolchainList>> {
+        cx: &mut Context<Self>,
+    ) -> Task<Option<(ToolchainList, Arc<Path>)>> {
        let registry = self.languages.clone();
-        let Some(abs_path) = self
-            .worktree_store
+
+        let manifest_tree = self.manifest_tree.downgrade();
+
+        let environment = self.project_environment.clone();
+        cx.spawn(async move |this, cx| {
+            let language = cx
+                .background_spawn(registry.language_for_name(language_name.as_ref()))
+                .await
+                .ok()?;
+            let toolchains = language.toolchain_lister()?;
+            let manifest_name = toolchains.manifest_name();
+            let (snapshot, worktree) = this
+                .update(cx, |this, cx| {
+                    this.worktree_store
                        .read(cx)
                        .worktree_for_id(path.worktree_id, cx)
-            .map(|worktree| worktree.read(cx).abs_path())
-        else {
-            return Task::ready(None);
-        };
-        let environment = self.project_environment.clone();
-        cx.spawn(async move |cx| {
+                        .map(|worktree| (worktree.read(cx).snapshot(), worktree))
+                })
+                .ok()
+                .flatten()?;
+            let worktree_id = snapshot.id();
+            let worktree_root = snapshot.abs_path().to_path_buf();
+            let relative_path = manifest_tree
+                .update(cx, |this, cx| {
+                    this.root_for_path(
+                        path,
+                        &mut std::iter::once(manifest_name.clone()),
+                        Arc::new(ManifestQueryDelegate::new(snapshot)),
+                        cx,
+                    )
+                })
+                .ok()?
+                .remove(&manifest_name)
+                .unwrap_or_else(|| ProjectPath {
+                    path: Arc::from(Path::new("")),
+                    worktree_id,
+                });
+            let abs_path = worktree
+                .update(cx, |this, _| this.absolutize(&relative_path.path).ok())
+                .ok()
+                .flatten()?;
+
            let project_env = environment
                .update(cx, |environment, cx| {
-                    environment.get_directory_environment(abs_path.clone(), cx)
+                    environment.get_directory_environment(abs_path.as_path().into(), cx)
                })
                .ok()?
                .await;

            cx.background_spawn(async move {
-                let language = registry
-                    .language_for_name(language_name.as_ref())
-                    .await
-                    .ok()?;
-                let toolchains = language.toolchain_lister()?;
-                Some(toolchains.list(abs_path.to_path_buf(), project_env).await)
+                Some((
+                    toolchains
+                        .list(
+                            worktree_root,
+                            Some(relative_path.path.clone())
+                                .filter(|_| *relative_path.path != *Path::new("")),
+                            project_env,
+                        )
+                        .await,
+                    relative_path.path,
+                ))
            })
            .await
        })
@ -404,7 +450,7 @@ impl RemoteToolchainStore {
        path: ProjectPath,
        language_name: LanguageName,
        cx: &App,
-    ) -> Task<Option<ToolchainList>> {
+    ) -> Task<Option<(ToolchainList, Arc<Path>)>> {
        let project_id = self.project_id;
        let client = self.client.clone();
        cx.background_spawn(async move {
@ -444,11 +490,20 @@ impl RemoteToolchainStore {
                    Some((usize::try_from(group.start_index).ok()?, group.name.into()))
                })
                .collect();
-            Some(ToolchainList {
+            let relative_path = Arc::from(Path::new(
+                response
+                    .relative_worktree_path
+                    .as_deref()
+                    .unwrap_or_default(),
+            ));
+            Some((
+                ToolchainList {
                    toolchains,
                    default: None,
                    groups,
-            })
+                },
+                relative_path,
+            ))
        })
    }
    pub(crate) fn active_toolchain(
--- a/crates/proto/proto/toolchain.proto
+++ b/crates/proto/proto/toolchain.proto
@ -23,6 +23,7 @@ message ListToolchainsResponse {
    repeated Toolchain toolchains = 1;
    bool has_values = 2;
    repeated ToolchainGroup groups = 3;
+    optional string relative_worktree_path = 4;
 }

 message ActivateToolchain {
--- a/crates/remote_server/src/headless_project.rs
+++ b/crates/remote_server/src/headless_project.rs
@ -9,8 +9,8 @@ use http_client::HttpClient;
 use language::{Buffer, BufferEvent, LanguageRegistry, proto::serialize_operation};
 use node_runtime::NodeRuntime;
 use project::{
-    LspStore, LspStoreEvent, PrettierStore, ProjectEnvironment, ProjectPath, ToolchainStore,
-    WorktreeId,
+    LspStore, LspStoreEvent, ManifestTree, PrettierStore, ProjectEnvironment, ProjectPath,
+    ToolchainStore, WorktreeId,
    buffer_store::{BufferStore, BufferStoreEvent},
    debugger::{breakpoint_store::BreakpointStore, dap_store::DapStore},
    git_store::GitStore,
@ -87,12 +87,13 @@ impl HeadlessProject {
        });

        let environment = cx.new(|_| ProjectEnvironment::new(None));
-
+        let manifest_tree = ManifestTree::new(worktree_store.clone(), cx);
        let toolchain_store = cx.new(|cx| {
            ToolchainStore::local(
                languages.clone(),
                worktree_store.clone(),
                environment.clone(),
+                manifest_tree.clone(),
                cx,
            )
        });
@ -172,6 +173,7 @@ impl HeadlessProject {
                prettier_store.clone(),
                toolchain_store.clone(),
                environment,
+                manifest_tree,
                languages.clone(),
                http_client.clone(),
                fs.clone(),
--- a/crates/repl/src/kernels/mod.rs
+++ b/crates/repl/src/kernels/mod.rs
@ -92,7 +92,7 @@ pub fn python_env_kernel_specifications(
    let background_executor = cx.background_executor().clone();

    async move {
-        let toolchains = if let Some(toolchains) = toolchains.await {
+        let toolchains = if let Some((toolchains, _)) = toolchains.await {
            toolchains
        } else {
            return Ok(Vec::new());
--- a/crates/toolchain_selector/src/active_toolchain.rs
+++ b/crates/toolchain_selector/src/active_toolchain.rs
@ -158,7 +158,7 @@ impl ActiveToolchain {
                let project = workspace
                    .read_with(cx, |this, _| this.project().clone())
                    .ok()?;
-                let toolchains = cx
+                let (toolchains, relative_path) = cx
                    .update(|_, cx| {
                        project.read(cx).available_toolchains(
                            ProjectPath {
--- a/crates/toolchain_selector/src/toolchain_selector.rs
+++ b/crates/toolchain_selector/src/toolchain_selector.rs
@ -10,7 +10,7 @@ use gpui::{
 use language::{LanguageName, Toolchain, ToolchainList};
 use picker::{Picker, PickerDelegate};
 use project::{Project, ProjectPath, WorktreeId};
-use std::{path::Path, sync::Arc};
+use std::{borrow::Cow, path::Path, sync::Arc};
 use ui::{HighlightedLabel, ListItem, ListItemSpacing, prelude::*};
 use util::ResultExt;
 use workspace::{ModalView, Workspace};
@ -172,18 +172,8 @@ impl ToolchainSelectorDelegate {
                let relative_path = this
                    .read_with(cx, |this, _| this.delegate.relative_path.clone())
                    .ok()?;
-                let placeholder_text = format!(
-                    "Select a {} for `{}`…",
-                    term.to_lowercase(),
-                    relative_path.to_string_lossy()
-                )
-                .into();
-                let _ = this.update_in(cx, move |this, window, cx| {
-                    this.delegate.placeholder_text = placeholder_text;
-                    this.refresh_placeholder(window, cx);
-                });

-                let available_toolchains = project
+                let (available_toolchains, relative_path) = project
                    .update(cx, |this, cx| {
                        this.available_toolchains(
                            ProjectPath {
@ -196,6 +186,21 @@ impl ToolchainSelectorDelegate {
                    })
                    .ok()?
                    .await?;
+                let pretty_path = {
+                    let path = relative_path.to_string_lossy();
+                    if path.is_empty() {
+                        Cow::Borrowed("worktree root")
+                    } else {
+                        Cow::Owned(format!("`{}`", path))
+                    }
+                };
+                let placeholder_text =
+                    format!("Select a {} for {pretty_path}…", term.to_lowercase(),).into();
+                let _ = this.update_in(cx, move |this, window, cx| {
+                    this.delegate.relative_path = relative_path;
+                    this.delegate.placeholder_text = placeholder_text;
+                    this.refresh_placeholder(window, cx);
+                });

                let _ = this.update_in(cx, move |this, window, cx| {
                    this.delegate.candidates = available_toolchains;