use std::fs;use zed::LanguageServerId;use zed_extension_api::{self as zed, settings::LspSettings, Result}; struct RuffBinary {    path: String,    args: Option<Vec<String>>,} struct RuffExtension {    cached_binary_path: Option<String>,} impl RuffExtension {    fn language_server_binary(        &mut self,        language_server_id: &LanguageServerId,        worktree: &zed::Worktree,    ) -> Result<RuffBinary> {        let binary_settings = LspSettings::for_worktree("ruff", worktree)            .ok()            .and_then(|lsp_settings| lsp_settings.binary);        let binary_args = binary_settings            .as_ref()            .and_then(|binary_settings| binary_settings.arguments.clone());         if let Some(path) = binary_settings.and_then(|binary_settings| binary_settings.path) {            return Ok(RuffBinary {                path,                args: binary_args,            });        }         if let Some(path) = worktree.which("ruff") {            return Ok(RuffBinary {                path,                args: binary_args,            });        }         if let Some(path) = &self.cached_binary_path {            if fs::metadata(path).map_or(false, |stat| stat.is_file()) {                return Ok(RuffBinary {                    path: path.clone(),                    args: binary_args,                });            }        }         zed::set_language_server_installation_status(            language_server_id,            &zed::LanguageServerInstallationStatus::CheckingForUpdate,        );        let release = zed::latest_github_release(            "astral-sh/ruff",            zed::GithubReleaseOptions {                require_assets: true,                pre_release: false,            },        )?;         let (platform, arch) = zed::current_platform();         let asset_stem = format!(            "ruff-{arch}-{os}",            arch = match arch {                zed::Architecture::Aarch64 => "aarch64",                zed::Architecture::X86 => "x86",                zed::Architecture::X8664 => "x86_64",            },            os = match platform {                zed::Os::Mac => "apple-darwin",                zed::Os::Linux => "unknown-linux-gnu",                zed::Os::Windows => "pc-windows-msvc",            }        );        let asset_name = format!(            "{asset_stem}.{suffix}",            suffix = match platform {                zed::Os::Windows => "zip",                _ => "tar.gz",            }        );         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!("ruff-{}", release.version);        let binary_path = match platform {            zed::Os::Windows => format!("{version_dir}/ruff.exe"),            _ => format!("{version_dir}/{asset_stem}/ruff"),        };         if !fs::metadata(&binary_path).map_or(false, |stat| stat.is_file()) {            zed::set_language_server_installation_status(                language_server_id,                &zed::LanguageServerInstallationStatus::Downloading,            );            let file_kind = match platform {                zed::Os::Windows => zed::DownloadedFileType::Zip,                _ => zed::DownloadedFileType::GzipTar,            };            zed::download_file(&asset.download_url, &version_dir, file_kind)                .map_err(|e| format!("failed to download file: {e}"))?;             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(RuffBinary {            path: binary_path,            args: binary_args,        })    }} impl zed::Extension for RuffExtension {    fn new() -> Self {        Self {            cached_binary_path: None,        }    }     fn language_server_command(        &mut self,        language_server_id: &LanguageServerId,        worktree: &zed::Worktree,    ) -> Result<zed::Command> {        let ruff_binary = self.language_server_binary(language_server_id, worktree)?;        Ok(zed::Command {            command: ruff_binary.path,            args: ruff_binary.args.unwrap_or_else(|| vec!["server".into()]),            env: vec![],        })    }     fn language_server_initialization_options(        &mut self,        server_id: &LanguageServerId,        worktree: &zed_extension_api::Worktree,    ) -> Result<Option<zed_extension_api::serde_json::Value>> {        let settings = LspSettings::for_worktree(server_id.as_ref(), worktree)            .ok()            .and_then(|lsp_settings| lsp_settings.initialization_options.clone())            .unwrap_or_default();        Ok(Some(settings))    }     fn language_server_workspace_configuration(        &mut self,        server_id: &LanguageServerId,        worktree: &zed_extension_api::Worktree,    ) -> Result<Option<zed_extension_api::serde_json::Value>> {        let settings = LspSettings::for_worktree(server_id.as_ref(), worktree)            .ok()            .and_then(|lsp_settings| lsp_settings.settings.clone())            .unwrap_or_default();        Ok(Some(settings))    }} zed::register_extension!(RuffExtension);