1use std::fs;
  2use zed_extension_api::{self as zed, Result};
  3
  4struct GleamExtension {
  5    cached_binary_path: Option<String>,
  6}
  7
  8impl GleamExtension {
  9    fn language_server_binary_path(&mut self, config: zed::LanguageServerConfig) -> Result<String> {
 10        if let Some(path) = &self.cached_binary_path {
 11            if fs::metadata(path).map_or(false, |stat| stat.is_file()) {
 12                return Ok(path.clone());
 13            }
 14        }
 15
 16        zed::set_language_server_installation_status(
 17            &config.name,
 18            &zed::LanguageServerInstallationStatus::CheckingForUpdate,
 19        );
 20        let release = zed::latest_github_release(
 21            "gleam-lang/gleam",
 22            zed::GithubReleaseOptions {
 23                require_assets: true,
 24                pre_release: false,
 25            },
 26        )?;
 27
 28        let (platform, arch) = zed::current_platform();
 29        let asset_name = format!(
 30            "gleam-{version}-{arch}-{os}.tar.gz",
 31            version = release.version,
 32            arch = match arch {
 33                zed::Architecture::Aarch64 => "aarch64",
 34                zed::Architecture::X86 => "x86",
 35                zed::Architecture::X8664 => "x86_64",
 36            },
 37            os = match platform {
 38                zed::Os::Mac => "apple-darwin",
 39                zed::Os::Linux => "unknown-linux-musl",
 40                zed::Os::Windows => "pc-windows-msvc",
 41            },
 42        );
 43
 44        let asset = release
 45            .assets
 46            .iter()
 47            .find(|asset| asset.name == asset_name)
 48            .ok_or_else(|| format!("no asset found matching {:?}", asset_name))?;
 49
 50        let version_dir = format!("gleam-{}", release.version);
 51        let binary_path = format!("{version_dir}/gleam");
 52
 53        if !fs::metadata(&binary_path).map_or(false, |stat| stat.is_file()) {
 54            zed::set_language_server_installation_status(
 55                &config.name,
 56                &zed::LanguageServerInstallationStatus::Downloading,
 57            );
 58
 59            zed::download_file(
 60                &asset.download_url,
 61                &version_dir,
 62                zed::DownloadedFileType::GzipTar,
 63            )
 64            .map_err(|e| format!("failed to download file: {e}"))?;
 65
 66            let entries =
 67                fs::read_dir(".").map_err(|e| format!("failed to list working directory {e}"))?;
 68            for entry in entries {
 69                let entry = entry.map_err(|e| format!("failed to load directory entry {e}"))?;
 70                if entry.file_name().to_str() != Some(&version_dir) {
 71                    fs::remove_dir_all(&entry.path()).ok();
 72                }
 73            }
 74        }
 75
 76        self.cached_binary_path = Some(binary_path.clone());
 77        Ok(binary_path)
 78    }
 79}
 80
 81impl zed::Extension for GleamExtension {
 82    fn new() -> Self {
 83        Self {
 84            cached_binary_path: None,
 85        }
 86    }
 87
 88    fn language_server_command(
 89        &mut self,
 90        config: zed::LanguageServerConfig,
 91        _worktree: &zed::Worktree,
 92    ) -> Result<zed::Command> {
 93        Ok(zed::Command {
 94            command: self.language_server_binary_path(config)?,
 95            args: vec!["lsp".to_string()],
 96            env: Default::default(),
 97        })
 98    }
 99}
100
101zed::register_extension!(GleamExtension);