use std::{env, fs};use zed_extension_api::{self as zed, Result}; const SERVER_PATH: &str = "node_modules/.bin/purescript-language-server";const PACKAGE_NAME: &str = "purescript-language-server"; struct PurescriptExtension {    did_find_server: bool,} impl PurescriptExtension {    fn server_exists(&self) -> bool {        fs::metadata(SERVER_PATH).map_or(false, |stat| stat.is_file())    }     fn server_script_path(&mut self, config: zed::LanguageServerConfig) -> Result<String> {        let server_exists = self.server_exists();        if self.did_find_server && server_exists {            return Ok(SERVER_PATH.to_string());        }         zed::set_language_server_installation_status(            &config.name,            &zed::LanguageServerInstallationStatus::CheckingForUpdate,        );        let version = zed::npm_package_latest_version(PACKAGE_NAME)?;         if !server_exists            || zed::npm_package_installed_version(PACKAGE_NAME)?.as_ref() != Some(&version)        {            zed::set_language_server_installation_status(                &config.name,                &zed::LanguageServerInstallationStatus::Downloading,            );            let result = zed::npm_install_package(PACKAGE_NAME, &version);            match result {                Ok(()) => {                    if !self.server_exists() {                        Err(format!(                            "installed package '{PACKAGE_NAME}' did not contain expected path '{SERVER_PATH}'",                        ))?;                    }                }                Err(error) => {                    if !self.server_exists() {                        Err(error)?;                    }                }            }        }         self.did_find_server = true;        Ok(SERVER_PATH.to_string())    }} impl zed::Extension for PurescriptExtension {    fn new() -> Self {        Self {            did_find_server: false,        }    }     fn language_server_command(        &mut self,        config: zed::LanguageServerConfig,        _worktree: &zed::Worktree,    ) -> Result<zed::Command> {        let server_path = self.server_script_path(config)?;        Ok(zed::Command {            command: zed::node_binary_path()?,            args: vec![                env::current_dir()                    .unwrap()                    .join(&server_path)                    .to_string_lossy()                    .to_string(),                "--stdio".to_string(),            ],            env: Default::default(),        })    }     fn language_server_initialization_options(        &mut self,        _config: zed::LanguageServerConfig,        _worktree: &zed::Worktree,    ) -> Result<Option<String>> {        let initialization_options = r#"{            "purescript": {                "addSpagoSources": true            }        }"#;         Ok(Some(initialization_options.to_string()))    }} zed::register_extension!(PurescriptExtension);