use anyhow::{anyhow, Result};use async_trait::async_trait;use futures::StreamExt;use language::{LanguageServerName, LspAdapter, LspAdapterDelegate};use lsp::LanguageServerBinary;use node_runtime::NodeRuntime;use serde_json::json;use smol::fs;use std::{    any::Any,    ffi::OsString,    path::{Path, PathBuf},    sync::Arc,};use util::{async_maybe, ResultExt}; const SERVER_PATH: &str =    "node_modules/vscode-langservers-extracted/bin/vscode-css-language-server"; fn server_binary_arguments(server_path: &Path) -> Vec<OsString> {    vec![server_path.into(), "--stdio".into()]} pub struct CssLspAdapter {    node: Arc<dyn NodeRuntime>,} impl CssLspAdapter {    pub fn new(node: Arc<dyn NodeRuntime>) -> Self {        CssLspAdapter { node }    }} #[async_trait(?Send)]impl LspAdapter for CssLspAdapter {    fn name(&self) -> LanguageServerName {        LanguageServerName("vscode-css-language-server".into())    }     async fn fetch_latest_server_version(        &self,        _: &dyn LspAdapterDelegate,    ) -> Result<Box<dyn 'static + Any + Send>> {        Ok(Box::new(            self.node                .npm_package_latest_version("vscode-langservers-extracted")                .await?,        ) as Box<_>)    }     async fn fetch_server_binary(        &self,        latest_version: Box<dyn 'static + Send + Any>,        container_dir: PathBuf,        _: &dyn LspAdapterDelegate,    ) -> Result<LanguageServerBinary> {        let latest_version = latest_version.downcast::<String>().unwrap();        let server_path = container_dir.join(SERVER_PATH);        let package_name = "vscode-langservers-extracted";         let should_install_language_server = self            .node            .should_install_npm_package(package_name, &server_path, &container_dir, &latest_version)            .await;         if should_install_language_server {            self.node                .npm_install_packages(&container_dir, &[(package_name, latest_version.as_str())])                .await?;        }         Ok(LanguageServerBinary {            path: self.node.binary_path().await?,            env: None,            arguments: server_binary_arguments(&server_path),        })    }     async fn cached_server_binary(        &self,        container_dir: PathBuf,        _: &dyn LspAdapterDelegate,    ) -> Option<LanguageServerBinary> {        get_cached_server_binary(container_dir, &*self.node).await    }     async fn installation_test_binary(        &self,        container_dir: PathBuf,    ) -> Option<LanguageServerBinary> {        get_cached_server_binary(container_dir, &*self.node).await    }     fn initialization_options(&self) -> Option<serde_json::Value> {        Some(json!({            "provideFormatter": true        }))    }} async fn get_cached_server_binary(    container_dir: PathBuf,    node: &dyn NodeRuntime,) -> Option<LanguageServerBinary> {    async_maybe!({        let mut last_version_dir = None;        let mut entries = fs::read_dir(&container_dir).await?;        while let Some(entry) = entries.next().await {            let entry = entry?;            if entry.file_type().await?.is_dir() {                last_version_dir = Some(entry.path());            }        }        let last_version_dir = last_version_dir.ok_or_else(|| anyhow!("no cached binary"))?;        let server_path = last_version_dir.join(SERVER_PATH);        if server_path.exists() {            Ok(LanguageServerBinary {                path: node.binary_path().await?,                env: None,                arguments: server_binary_arguments(&server_path),            })        } else {            Err(anyhow!(                "missing executable in directory {:?}",                last_version_dir            ))        }    })    .await    .log_err()} #[cfg(test)]mod tests {    use gpui::{Context, TestAppContext};    use text::BufferId;    use unindent::Unindent;     #[gpui::test]    async fn test_outline(cx: &mut TestAppContext) {        let language = crate::language("css", tree_sitter_css::language());         let text = r#"            /* Import statement */            @import './fonts.css';             /* multiline list of selectors with nesting */            .test-class,            div {                .nested-class {                    color: red;                }            }             /* descendant selectors */            .test .descendant {}             /* pseudo */            .test:not(:hover) {}             /* media queries */            @media screen and (min-width: 3000px) {                .desktop-class {}            }        "#        .unindent();         let buffer = cx.new_model(|cx| {            language::Buffer::new(0, BufferId::new(cx.entity_id().as_u64()).unwrap(), text)                .with_language(language, cx)        });        let outline = buffer.update(cx, |buffer, _| buffer.snapshot().outline(None).unwrap());        assert_eq!(            outline                .items                .iter()                .map(|item| (item.text.as_str(), item.depth))                .collect::<Vec<_>>(),            &[                ("@import './fonts.css'", 0),                (".test-class, div", 0),                (".nested-class", 1),                (".test .descendant", 0),                (".test:not(:hover)", 0),                ("@media screen and (min-width: 3000px)", 0),                (".desktop-class", 1),            ]        );    }}