use std::fs;use zed::lsp::CompletionKind;use zed::{serde_json, CodeLabel, CodeLabelSpan, LanguageServerId};use zed_extension_api::settings::LspSettings;use zed_extension_api::{self as zed, Result}; struct DenoExtension {    cached_binary_path: Option<String>,} impl DenoExtension {    fn language_server_binary_path(        &mut self,        language_server_id: &LanguageServerId,        worktree: &zed::Worktree,    ) -> Result<String> {        if let Some(path) = worktree.which("deno") {            return Ok(path);        }         if let Some(path) = &self.cached_binary_path {            if fs::metadata(path).map_or(false, |stat| stat.is_file()) {                return Ok(path.clone());            }        }         zed::set_language_server_installation_status(            language_server_id,            &zed::LanguageServerInstallationStatus::CheckingForUpdate,        );        let release = zed::latest_github_release(            "denoland/deno",            zed::GithubReleaseOptions {                require_assets: true,                pre_release: false,            },        )?;         let (platform, arch) = zed::current_platform();        let asset_name = format!(            "deno-{arch}-{os}.zip",            arch = match arch {                zed::Architecture::Aarch64 => "aarch64",                zed::Architecture::X8664 => "x86_64",                zed::Architecture::X86 =>                    return Err(format!("unsupported architecture: {arch:?}")),            },            os = match platform {                zed::Os::Mac => "apple-darwin",                zed::Os::Linux => "unknown-linux-gnu",                zed::Os::Windows => "pc-windows-msvc",            },        );         let asset = release            .assets            .iter()            .find(|asset| asset.name == asset_name)            .ok_or_else(|| format!("no asset found matching {:?}", asset_name))?;         let version_dir = format!("deno-{}", release.version);        let binary_path = format!("{version_dir}/deno");         if !fs::metadata(&binary_path).map_or(false, |stat| stat.is_file()) {            zed::set_language_server_installation_status(                language_server_id,                &zed::LanguageServerInstallationStatus::Downloading,            );             zed::download_file(                &asset.download_url,                &version_dir,                zed::DownloadedFileType::Zip,            )            .map_err(|e| format!("failed to download file: {e}"))?;             zed::make_file_executable(&binary_path)?;             let entries =                fs::read_dir(".").map_err(|e| format!("failed to list working directory {e}"))?;            for entry in entries {                let entry = entry.map_err(|e| format!("failed to load directory entry {e}"))?;                if entry.file_name().to_str() != Some(&version_dir) {                    fs::remove_dir_all(entry.path()).ok();                }            }        }         self.cached_binary_path = Some(binary_path.clone());        Ok(binary_path)    }} impl zed::Extension for DenoExtension {    fn new() -> Self {        Self {            cached_binary_path: None,        }    }     fn language_server_command(        &mut self,        language_server_id: &LanguageServerId,        worktree: &zed::Worktree,    ) -> Result<zed::Command> {        Ok(zed::Command {            command: self.language_server_binary_path(language_server_id, worktree)?,            args: vec!["lsp".to_string()],            env: Default::default(),        })    }     fn language_server_initialization_options(        &mut self,        _language_server_id: &zed::LanguageServerId,        _worktree: &zed::Worktree,    ) -> Result<Option<serde_json::Value>> {        Ok(Some(serde_json::json!({            "provideFormatter": true,        })))    }     fn language_server_workspace_configuration(        &mut self,        _language_server_id: &zed::LanguageServerId,        worktree: &zed::Worktree,    ) -> Result<Option<serde_json::Value>> {        let settings = LspSettings::for_worktree("deno", worktree)            .ok()            .and_then(|lsp_settings| lsp_settings.settings.clone())            .unwrap_or_default();        Ok(Some(settings))    }     fn label_for_completion(        &self,        _language_server_id: &LanguageServerId,        completion: zed::lsp::Completion,    ) -> Option<CodeLabel> {        let highlight_name = match completion.kind? {            CompletionKind::Class | CompletionKind::Interface | CompletionKind::Constructor => {                "type"            }            CompletionKind::Constant => "constant",            CompletionKind::Function | CompletionKind::Method => "function",            CompletionKind::Property | CompletionKind::Field => "property",            _ => return None,        };         let len = completion.label.len();        let name_span = CodeLabelSpan::literal(completion.label, Some(highlight_name.to_string()));         Some(zed::CodeLabel {            code: Default::default(),            spans: if let Some(detail) = completion.detail {                vec![                    name_span,                    CodeLabelSpan::literal(" ", None),                    CodeLabelSpan::literal(detail, None),                ]            } else {                vec![name_span]            },            filter_range: (0..len).into(),        })    }} zed::register_extension!(DenoExtension);