Enable CSS, JSON, Python, and Tailwind to lookup LSP installed in PATH (#22037)

Co-authored-by: Peter Tripp <peter@zed.dev>

crates/languages/src/css.rs

@@ -1,7 +1,8 @@
 use anyhow::{anyhow, Result};
 use async_trait::async_trait;
 use futures::StreamExt;
-use language::{LspAdapter, LspAdapterDelegate};
+use gpui::AsyncApp;
+use language::{LanguageToolchainStore, LspAdapter, LspAdapterDelegate};
 use lsp::{LanguageServerBinary, LanguageServerName};
 use node_runtime::NodeRuntime;
 use project::Fs;
@@ -39,6 +40,24 @@ impl LspAdapter for CssLspAdapter {
         LanguageServerName("vscode-css-language-server".into())
     }
 
+    async fn check_if_user_installed(
+        &self,
+        delegate: &dyn LspAdapterDelegate,
+        _: Arc<dyn LanguageToolchainStore>,
+        _: &AsyncApp,
+    ) -> Option<LanguageServerBinary> {
+        let path = delegate
+            .which("vscode-css-language-server".as_ref())
+            .await?;
+        let env = delegate.shell_env().await;
+
+        Some(LanguageServerBinary {
+            path,
+            env: Some(env),
+            arguments: vec!["--stdio".into()],
+        })
+    }
+
     async fn fetch_latest_server_version(
         &self,
         _: &dyn LspAdapterDelegate,

crates/languages/src/json.rs

@@ -149,6 +149,24 @@ impl LspAdapter for JsonLspAdapter {
         LanguageServerName("json-language-server".into())
     }
 
+    async fn check_if_user_installed(
+        &self,
+        delegate: &dyn LspAdapterDelegate,
+        _: Arc<dyn LanguageToolchainStore>,
+        _: &AsyncApp,
+    ) -> Option<LanguageServerBinary> {
+        let path = delegate
+            .which("vscode-json-language-server".as_ref())
+            .await?;
+        let env = delegate.shell_env().await;
+
+        Some(LanguageServerBinary {
+            path,
+            env: Some(env),
+            arguments: vec!["--stdio".into()],
+        })
+    }
+
     async fn fetch_latest_server_version(
         &self,
         _: &dyn LspAdapterDelegate,

crates/languages/src/python.rs

@@ -83,19 +83,28 @@ impl LspAdapter for PythonLspAdapter {
         _: Arc<dyn LanguageToolchainStore>,
         _: &AsyncApp,
     ) -> Option<LanguageServerBinary> {
-        let node = delegate.which("node".as_ref()).await?;
-        let (node_modules_path, _) = delegate
-            .npm_package_installed_version(Self::SERVER_NAME.as_ref())
-            .await
-            .log_err()??;
+        if let Some(pyright_bin) = delegate.which(Self::SERVER_NAME.as_ref()).await {
+            let env = delegate.shell_env().await;
+            Some(LanguageServerBinary {
+                path: pyright_bin,
+                env: Some(env),
+                arguments: vec!["--stdio".into()],
+            })
+        } else {
+            let node = delegate.which("node".as_ref()).await?;
+            let (node_modules_path, _) = delegate
+                .npm_package_installed_version(Self::SERVER_NAME.as_ref())
+                .await
+                .log_err()??;
 
-        let path = node_modules_path.join(NODE_MODULE_RELATIVE_SERVER_PATH);
+            let path = node_modules_path.join(NODE_MODULE_RELATIVE_SERVER_PATH);
 
-        Some(LanguageServerBinary {
-            path: node,
-            env: None,
-            arguments: server_binary_arguments(&path),
-        })
+            Some(LanguageServerBinary {
+                path: node,
+                env: None,
+                arguments: server_binary_arguments(&path),
+            })
+        }
     }
 
     async fn fetch_latest_server_version(
@@ -791,19 +800,28 @@ impl LspAdapter for PyLspAdapter {
         toolchains: Arc<dyn LanguageToolchainStore>,
         cx: &AsyncApp,
     ) -> Option<LanguageServerBinary> {
-        let venv = toolchains
-            .active_toolchain(
-                delegate.worktree_id(),
-                LanguageName::new("Python"),
-                &mut cx.clone(),
-            )
-            .await?;
-        let pylsp_path = Path::new(venv.path.as_ref()).parent()?.join("pylsp");
-        pylsp_path.exists().then(|| LanguageServerBinary {
-            path: venv.path.to_string().into(),
-            arguments: vec![pylsp_path.into()],
-            env: None,
-        })
+        if let Some(pylsp_bin) = delegate.which(Self::SERVER_NAME.as_ref()).await {
+            let env = delegate.shell_env().await;
+            Some(LanguageServerBinary {
+                path: pylsp_bin,
+                env: Some(env),
+                arguments: vec![],
+            })
+        } else {
+            let venv = toolchains
+                .active_toolchain(
+                    delegate.worktree_id(),
+                    LanguageName::new("Python"),
+                    &mut cx.clone(),
+                )
+                .await?;
+            let pylsp_path = Path::new(venv.path.as_ref()).parent()?.join("pylsp");
+            pylsp_path.exists().then(|| LanguageServerBinary {
+                path: venv.path.to_string().into(),
+                arguments: vec![pylsp_path.into()],
+                env: None,
+            })
+        }
     }
 
     async fn fetch_latest_server_version(

crates/languages/src/tailwind.rs

@@ -47,6 +47,22 @@ impl LspAdapter for TailwindLspAdapter {
         Self::SERVER_NAME.clone()
     }
 
+    async fn check_if_user_installed(
+        &self,
+        delegate: &dyn LspAdapterDelegate,
+        _: Arc<dyn LanguageToolchainStore>,
+        _: &AsyncApp,
+    ) -> Option<LanguageServerBinary> {
+        let path = delegate.which(Self::SERVER_NAME.as_ref()).await?;
+        let env = delegate.shell_env().await;
+
+        Some(LanguageServerBinary {
+            path,
+            env: Some(env),
+            arguments: vec!["--stdio".into()],
+        })
+    }
+
     async fn fetch_latest_server_version(
         &self,
         _: &dyn LspAdapterDelegate,