1use std::fs;
  2use zed::LanguageServerId;
  3use zed_extension_api::{self as zed, settings::LspSettings, Result};
  4
  5struct RuffExtension {
  6    cached_binary_path: Option<String>,
  7}
  8
  9impl RuffExtension {
 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) = worktree.which("ruff") {
 16            return Ok(path);
 17        }
 18
 19        zed::set_language_server_installation_status(
 20            &language_server_id,
 21            &zed::LanguageServerInstallationStatus::CheckingForUpdate,
 22        );
 23        let release = zed::latest_github_release(
 24            "astral-sh/ruff",
 25            zed::GithubReleaseOptions {
 26                require_assets: true,
 27                pre_release: false,
 28            },
 29        )?;
 30
 31        let (platform, arch) = zed::current_platform();
 32
 33        let asset_stem = format!(
 34            "ruff-{arch}-{os}",
 35            arch = match arch {
 36                zed::Architecture::Aarch64 => "aarch64",
 37                zed::Architecture::X86 => "x86",
 38                zed::Architecture::X8664 => "x86_64",
 39            },
 40            os = match platform {
 41                zed::Os::Mac => "apple-darwin",
 42                zed::Os::Linux => "unknown-linux-gnu",
 43                zed::Os::Windows => "pc-windows-msvc",
 44            }
 45        );
 46        let asset_name = format!(
 47            "{asset_stem}.{suffix}",
 48            suffix = match platform {
 49                zed::Os::Windows => "zip",
 50                _ => "tar.gz",
 51            }
 52        );
 53
 54        let asset = release
 55            .assets
 56            .iter()
 57            .find(|asset| asset.name == asset_name)
 58            .ok_or_else(|| format!("no asset found matching {:?}", asset_name))?;
 59
 60        let version_dir = format!("ruff-{}", release.version);
 61        let binary_path = format!("{version_dir}/{asset_stem}/ruff");
 62
 63        if !fs::metadata(&binary_path).map_or(false, |stat| stat.is_file()) {
 64            zed::set_language_server_installation_status(
 65                &language_server_id,
 66                &zed::LanguageServerInstallationStatus::Downloading,
 67            );
 68            let file_kind = match platform {
 69                zed::Os::Windows => zed::DownloadedFileType::Zip,
 70                _ => zed::DownloadedFileType::GzipTar,
 71            };
 72            zed::download_file(&asset.download_url, &version_dir, file_kind)
 73                .map_err(|e| format!("failed to download file: {e}"))?;
 74
 75            let entries =
 76                fs::read_dir(".").map_err(|e| format!("failed to list working directory {e}"))?;
 77            for entry in entries {
 78                let entry = entry.map_err(|e| format!("failed to load directory entry {e}"))?;
 79                if entry.file_name().to_str() != Some(&version_dir) {
 80                    fs::remove_dir_all(&entry.path()).ok();
 81                }
 82            }
 83        }
 84
 85        self.cached_binary_path = Some(binary_path.clone());
 86        Ok(binary_path)
 87    }
 88}
 89
 90impl zed::Extension for RuffExtension {
 91    fn new() -> Self {
 92        Self {
 93            cached_binary_path: None,
 94        }
 95    }
 96
 97    fn language_server_command(
 98        &mut self,
 99        server_id: &LanguageServerId,
100        worktree: &zed::Worktree,
101    ) -> Result<zed::Command> {
102        let mut binary = None;
103        let mut args = None;
104        if let Some(binary_settings) = LspSettings::for_worktree(server_id.as_ref(), worktree)
105            .ok()
106            .and_then(|lsp_settings| lsp_settings.binary)
107        {
108            if let Some(bin_path) = binary_settings.path {
109                binary = Some(bin_path);
110            }
111            if let Some(bin_args) = binary_settings.arguments {
112                args = Some(bin_args);
113            }
114        }
115        let command = if let Some(binary) = binary {
116            binary
117        } else {
118            self.language_server_binary_path(server_id, worktree)?
119        };
120        let args = args.unwrap_or_else(|| vec!["server".into()]);
121        Ok(zed::Command {
122            command,
123            args,
124            env: vec![],
125        })
126    }
127
128    fn language_server_initialization_options(
129        &mut self,
130        server_id: &LanguageServerId,
131        worktree: &zed_extension_api::Worktree,
132    ) -> Result<Option<zed_extension_api::serde_json::Value>> {
133        let settings = LspSettings::for_worktree(server_id.as_ref(), worktree)
134            .ok()
135            .and_then(|lsp_settings| lsp_settings.initialization_options.clone())
136            .unwrap_or_default();
137        Ok(Some(settings))
138    }
139
140    fn language_server_workspace_configuration(
141        &mut self,
142        server_id: &LanguageServerId,
143        worktree: &zed_extension_api::Worktree,
144    ) -> Result<Option<zed_extension_api::serde_json::Value>> {
145        let settings = LspSettings::for_worktree(server_id.as_ref(), worktree)
146            .ok()
147            .and_then(|lsp_settings| lsp_settings.settings.clone())
148            .unwrap_or_default();
149        Ok(Some(settings))
150    }
151}
152
153zed::register_extension!(RuffExtension);