use std::fs;use zed::LanguageServerId;use zed_extension_api::{self as zed, Result}; struct ZigExtension {    cached_binary_path: Option<String>,} #[derive(Clone)]struct ZlsBinary {    path: String,    environment: Option<Vec<(String, String)>>,} impl ZigExtension {    fn language_server_binary(        &mut self,        language_server_id: &LanguageServerId,        worktree: &zed::Worktree,    ) -> Result<ZlsBinary> {        if let Some(path) = worktree.which("zls") {            let environment = worktree.shell_env();            return Ok(ZlsBinary {                path,                environment: Some(environment),            });        }         if let Some(path) = &self.cached_binary_path {            if fs::metadata(&path).map_or(false, |stat| stat.is_file()) {                return Ok(ZlsBinary {                    path: path.clone(),                    environment: None,                });            }        }         zed::set_language_server_installation_status(            &language_server_id,            &zed::LanguageServerInstallationStatus::CheckingForUpdate,        );        // We're pinning ZLS to a release that has `.tar.gz` assets, since the latest release does not have        // them, at time of writing.        //        // ZLS tracking issue: https://github.com/zigtools/zls/issues/1879        let release = zed::github_release_by_tag_name("zigtools/zls", "0.11.0")?;         let (platform, arch) = zed::current_platform();        let asset_name = format!(            "zls-{arch}-{os}.{extension}",            arch = match arch {                zed::Architecture::Aarch64 => "aarch64",                zed::Architecture::X86 => "x86",                zed::Architecture::X8664 => "x86_64",            },            os = match platform {                zed::Os::Mac => "macos",                zed::Os::Linux => "linux",                zed::Os::Windows => "windows",            },            extension = match platform {                zed::Os::Mac | zed::Os::Linux => "tar.gz",                zed::Os::Windows => "zip",            }        );         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!("zls-{}", release.version);        let binary_path = format!("{version_dir}/bin/zls");         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,                match platform {                    zed::Os::Mac | zed::Os::Linux => zed::DownloadedFileType::GzipTar,                    zed::Os::Windows => 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(ZlsBinary {            path: binary_path,            environment: None,        })    }} impl zed::Extension for ZigExtension {    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 zls_binary = self.language_server_binary(language_server_id, worktree)?;        Ok(zed::Command {            command: zls_binary.path,            args: vec![],            env: zls_binary.environment.unwrap_or_default(),        })    }} zed::register_extension!(ZigExtension);