1use std::fs;
  2use zed::LanguageServerId;
  3use zed_extension_api::{self as zed, Result};
  4
  5struct TerraformExtension {
  6    cached_binary_path: Option<String>,
  7}
  8
  9impl TerraformExtension {
 10    fn language_server_binary_path(
 11        &mut self,
 12        language_server_id: &LanguageServerId,
 13        worktree: &zed::Worktree,
 14    ) -> Result<String> {
 15        if let Some(path) = &self.cached_binary_path {
 16            if fs::metadata(path).map_or(false, |stat| stat.is_file()) {
 17                return Ok(path.clone());
 18            }
 19        }
 20
 21        if let Some(path) = worktree.which("terraform-ls") {
 22            self.cached_binary_path = Some(path.clone());
 23            return Ok(path);
 24        }
 25
 26        zed::set_language_server_installation_status(
 27            &language_server_id,
 28            &zed::LanguageServerInstallationStatus::CheckingForUpdate,
 29        );
 30        let release = zed::latest_github_release(
 31            "hashicorp/terraform-ls",
 32            zed::GithubReleaseOptions {
 33                require_assets: false,
 34                pre_release: false,
 35            },
 36        )?;
 37
 38        let (platform, arch) = zed::current_platform();
 39        let download_url = format!(
 40            "https://releases.hashicorp.com/terraform-ls/{version}/terraform-ls_{version}_{os}_{arch}.zip",
 41            version = release.version.strip_prefix('v').unwrap_or(&release.version),
 42            os = match platform {
 43                zed::Os::Mac => "darwin",
 44                zed::Os::Linux => "linux",
 45                zed::Os::Windows => "windows",
 46            },
 47            arch = match arch {
 48                zed::Architecture::Aarch64 => "arm64",
 49                zed::Architecture::X86 => "386",
 50                zed::Architecture::X8664 => "amd64",
 51            },
 52        );
 53
 54        let version_dir = format!("terraform-ls-{}", release.version);
 55        let binary_path = format!("{version_dir}/terraform-ls");
 56
 57        if !fs::metadata(&binary_path).map_or(false, |stat| stat.is_file()) {
 58            zed::set_language_server_installation_status(
 59                &language_server_id,
 60                &zed::LanguageServerInstallationStatus::Downloading,
 61            );
 62
 63            zed::download_file(&download_url, &version_dir, zed::DownloadedFileType::Zip)
 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 TerraformExtension {
 82    fn new() -> Self {
 83        Self {
 84            cached_binary_path: None,
 85        }
 86    }
 87
 88    fn language_server_command(
 89        &mut self,
 90        language_server_id: &LanguageServerId,
 91        worktree: &zed::Worktree,
 92    ) -> Result<zed::Command> {
 93        Ok(zed::Command {
 94            command: self.language_server_binary_path(language_server_id, worktree)?,
 95            args: vec!["serve".to_string()],
 96            env: Default::default(),
 97        })
 98    }
 99}
100
101zed::register_extension!(TerraformExtension);