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                zed::set_language_server_installation_status(
 13                    &config.name,
 14                    &zed::LanguageServerInstallationStatus::Cached,
 15                );
 16                return Ok(path.clone());
 17            }
 18        }
 19
 20        zed::set_language_server_installation_status(
 21            &config.name,
 22            &zed::LanguageServerInstallationStatus::CheckingForUpdate,
 23        );
 24        let release = zed::latest_github_release(
 25            "gleam-lang/gleam",
 26            zed::GithubReleaseOptions {
 27                require_assets: true,
 28                pre_release: false,
 29            },
 30        )?;
 31
 32        let (platform, arch) = zed::current_platform();
 33        let asset_name = format!(
 34            "gleam-{version}-{arch}-{os}.tar.gz",
 35            version = release.version,
 36            arch = match arch {
 37                zed::Architecture::Aarch64 => "aarch64",
 38                zed::Architecture::X86 => "x86",
 39                zed::Architecture::X8664 => "x86_64",
 40            },
 41            os = match platform {
 42                zed::Os::Mac => "apple-darwin",
 43                zed::Os::Linux => "unknown-linux-musl",
 44                zed::Os::Windows => "pc-windows-msvc",
 45            },
 46        );
 47
 48        let asset = release
 49            .assets
 50            .iter()
 51            .find(|asset| asset.name == asset_name)
 52            .ok_or_else(|| format!("no asset found matching {:?}", asset_name))?;
 53
 54        let version_dir = format!("gleam-{}", release.version);
 55        let binary_path = format!("{version_dir}/gleam");
 56
 57        if !fs::metadata(&binary_path).map_or(false, |stat| stat.is_file()) {
 58            zed::set_language_server_installation_status(
 59                &config.name,
 60                &zed::LanguageServerInstallationStatus::Downloading,
 61            );
 62
 63            zed::download_file(
 64                &asset.download_url,
 65                &version_dir,
 66                zed::DownloadedFileType::GzipTar,
 67            )
 68            .map_err(|e| format!("failed to download file: {e}"))?;
 69
 70            let entries =
 71                fs::read_dir(".").map_err(|e| format!("failed to list working directory {e}"))?;
 72            for entry in entries {
 73                let entry = entry.map_err(|e| format!("failed to load directory entry {e}"))?;
 74                if entry.file_name().to_str() != Some(&version_dir) {
 75                    fs::remove_dir_all(&entry.path()).ok();
 76                }
 77            }
 78
 79            zed::set_language_server_installation_status(
 80                &config.name,
 81                &zed::LanguageServerInstallationStatus::Downloaded,
 82            );
 83        }
 84
 85        self.cached_binary_path = Some(binary_path.clone());
 86        Ok(binary_path)
 87    }
 88}
 89
 90impl zed::Extension for GleamExtension {
 91    fn new() -> Self {
 92        Self {
 93            cached_binary_path: None,
 94        }
 95    }
 96
 97    fn language_server_command(
 98        &mut self,
 99        config: zed::LanguageServerConfig,
100        _worktree: &zed::Worktree,
101    ) -> Result<zed::Command> {
102        Ok(zed::Command {
103            command: self.language_server_binary_path(config)?,
104            args: vec!["lsp".to_string()],
105            env: Default::default(),
106        })
107    }
108}
109
110zed::register_extension!(GleamExtension);