1use std::{env, fs};
  2use zed::settings::LspSettings;
  3use zed_extension_api::{self as zed, LanguageServerId, Result, serde_json::json};
  4
  5const BINARY_NAME: &str = "vscode-html-language-server";
  6const SERVER_PATH: &str =
  7    "node_modules/@zed-industries/vscode-langservers-extracted/bin/vscode-html-language-server";
  8const PACKAGE_NAME: &str = "@zed-industries/vscode-langservers-extracted";
  9
 10struct HtmlExtension {
 11    cached_binary_path: Option<String>,
 12}
 13
 14impl HtmlExtension {
 15    fn server_exists(&self) -> bool {
 16        fs::metadata(SERVER_PATH).is_ok_and(|stat| stat.is_file())
 17    }
 18
 19    fn server_script_path(&mut self, language_server_id: &LanguageServerId) -> Result<String> {
 20        let server_exists = self.server_exists();
 21        if self.cached_binary_path.is_some() && server_exists {
 22            return Ok(SERVER_PATH.to_string());
 23        }
 24
 25        zed::set_language_server_installation_status(
 26            language_server_id,
 27            &zed::LanguageServerInstallationStatus::CheckingForUpdate,
 28        );
 29        let version = zed::npm_package_latest_version(PACKAGE_NAME)?;
 30
 31        if !server_exists
 32            || zed::npm_package_installed_version(PACKAGE_NAME)?.as_ref() != Some(&version)
 33        {
 34            zed::set_language_server_installation_status(
 35                language_server_id,
 36                &zed::LanguageServerInstallationStatus::Downloading,
 37            );
 38            let result = zed::npm_install_package(PACKAGE_NAME, &version);
 39            match result {
 40                Ok(()) => {
 41                    if !self.server_exists() {
 42                        Err(format!(
 43                            "installed package '{PACKAGE_NAME}' did not contain expected path '{SERVER_PATH}'",
 44                        ))?;
 45                    }
 46                }
 47                Err(error) => {
 48                    if !self.server_exists() {
 49                        Err(error)?;
 50                    }
 51                }
 52            }
 53        }
 54        Ok(SERVER_PATH.to_string())
 55    }
 56}
 57
 58impl zed::Extension for HtmlExtension {
 59    fn new() -> Self {
 60        Self {
 61            cached_binary_path: None,
 62        }
 63    }
 64
 65    fn language_server_command(
 66        &mut self,
 67        language_server_id: &LanguageServerId,
 68        worktree: &zed::Worktree,
 69    ) -> Result<zed::Command> {
 70        let server_path = if let Some(path) = worktree.which(BINARY_NAME) {
 71            return Ok(zed::Command {
 72                command: path,
 73                args: vec!["--stdio".to_string()],
 74                env: Default::default(),
 75            });
 76        } else {
 77            let server_path = self.server_script_path(language_server_id)?;
 78            env::current_dir()
 79                .unwrap()
 80                .join(&server_path)
 81                .to_string_lossy()
 82                .to_string()
 83        };
 84        self.cached_binary_path = Some(server_path.clone());
 85
 86        Ok(zed::Command {
 87            command: zed::node_binary_path()?,
 88            args: vec![server_path, "--stdio".to_string()],
 89            env: Default::default(),
 90        })
 91    }
 92
 93    fn language_server_workspace_configuration(
 94        &mut self,
 95        server_id: &LanguageServerId,
 96        worktree: &zed::Worktree,
 97    ) -> Result<Option<zed::serde_json::Value>> {
 98        let settings = LspSettings::for_worktree(server_id.as_ref(), worktree)
 99            .ok()
100            .and_then(|lsp_settings| lsp_settings.settings)
101            .unwrap_or_default();
102        Ok(Some(settings))
103    }
104
105    fn language_server_initialization_options(
106        &mut self,
107        _server_id: &LanguageServerId,
108        _worktree: &zed_extension_api::Worktree,
109    ) -> Result<Option<zed_extension_api::serde_json::Value>> {
110        let initialization_options = json!({"provideFormatter": true });
111        Ok(Some(initialization_options))
112    }
113}
114
115zed::register_extension!(HtmlExtension);