use std::fs;use zed_extension_api::{self as zed, settings::LspSettings, LanguageServerId, Result}; struct OmnisharpBinary {    path: String,    args: Option<Vec<String>>,} struct CsharpExtension {    cached_binary_path: Option<String>,} impl CsharpExtension {    fn language_server_binary(        &mut self,        language_server_id: &LanguageServerId,        worktree: &zed::Worktree,    ) -> Result<OmnisharpBinary> {        let binary_settings = LspSettings::for_worktree("omnisharp", 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(OmnisharpBinary {                path,                args: binary_args,            });        }         if let Some(path) = worktree.which("OmniSharp") {            return Ok(OmnisharpBinary {                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(OmnisharpBinary {                    path: path.clone(),                    args: binary_args,                });            }        }         zed::set_language_server_installation_status(            language_server_id,            &zed::LanguageServerInstallationStatus::CheckingForUpdate,        );        let release = zed::latest_github_release(            "OmniSharp/omnisharp-roslyn",            zed::GithubReleaseOptions {                require_assets: true,                pre_release: false,            },        )?;         let (platform, arch) = zed::current_platform();        let asset_name = format!(            "omnisharp-{os}-{arch}-net6.0.{extension}",            os = match platform {                zed::Os::Mac => "osx",                zed::Os::Linux => "linux",                zed::Os::Windows => "win",            },            arch = match arch {                zed::Architecture::Aarch64 => "arm64",                zed::Architecture::X86 => "x86",                zed::Architecture::X8664 => "x64",            },            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!("omnisharp-{}", release.version);        let binary_path = format!("{version_dir}/OmniSharp");         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}"))?;             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(OmnisharpBinary {            path: binary_path,            args: binary_args,        })    }} impl zed::Extension for CsharpExtension {    fn new() -> Self {        Self {            cached_binary_path: None,        }    }     fn language_server_command(        &mut self,        language_server_id: &zed::LanguageServerId,        worktree: &zed::Worktree,    ) -> Result<zed::Command> {        let omnisharp_binary = self.language_server_binary(language_server_id, worktree)?;        Ok(zed::Command {            command: omnisharp_binary.path,            args: omnisharp_binary.args.unwrap_or_else(|| vec!["-lsp".into()]),            env: Default::default(),        })    }} zed::register_extension!(CsharpExtension);