1use std::fs;
  2use zed::lsp::CompletionKind;
  3use zed::{CodeLabel, CodeLabelSpan, LanguageServerId};
  4use zed_extension_api::{self as zed, Result};
  5
  6struct LuaExtension {
  7    cached_binary_path: Option<String>,
  8}
  9
 10impl LuaExtension {
 11    fn language_server_binary_path(
 12        &mut self,
 13        language_server_id: &LanguageServerId,
 14        worktree: &zed::Worktree,
 15    ) -> Result<String> {
 16        if let Some(path) = &self.cached_binary_path {
 17            if fs::metadata(path).map_or(false, |stat| stat.is_file()) {
 18                return Ok(path.clone());
 19            }
 20        }
 21
 22        if let Some(path) = worktree.which("lua-language-server") {
 23            self.cached_binary_path = Some(path.clone());
 24            return Ok(path);
 25        }
 26
 27        zed::set_language_server_installation_status(
 28            &language_server_id,
 29            &zed::LanguageServerInstallationStatus::CheckingForUpdate,
 30        );
 31        let release = zed::latest_github_release(
 32            "LuaLS/lua-language-server",
 33            zed::GithubReleaseOptions {
 34                require_assets: true,
 35                pre_release: false,
 36            },
 37        )?;
 38
 39        let (platform, arch) = zed::current_platform();
 40        let asset_name = format!(
 41            "lua-language-server-{version}-{os}-{arch}.tar.gz",
 42            version = release.version,
 43            os = match platform {
 44                zed::Os::Mac => "darwin",
 45                zed::Os::Linux => "linux",
 46                zed::Os::Windows => "win32",
 47            },
 48            arch = match arch {
 49                zed::Architecture::Aarch64 => "arm64",
 50                zed::Architecture::X8664 => "x86_64",
 51                zed::Architecture::X86 => return Err("unsupported platform x86".into()),
 52            },
 53        );
 54
 55        let asset = release
 56            .assets
 57            .iter()
 58            .find(|asset| asset.name == asset_name)
 59            .ok_or_else(|| format!("no asset found matching {:?}", asset_name))?;
 60
 61        let version_dir = format!("lua-language-server-{}", release.version);
 62        let binary_path = format!("{version_dir}/bin/lua-language-server");
 63
 64        if !fs::metadata(&binary_path).map_or(false, |stat| stat.is_file()) {
 65            zed::set_language_server_installation_status(
 66                &language_server_id,
 67                &zed::LanguageServerInstallationStatus::Downloading,
 68            );
 69
 70            zed::download_file(
 71                &asset.download_url,
 72                &version_dir,
 73                zed::DownloadedFileType::GzipTar,
 74            )
 75            .map_err(|e| format!("failed to download file: {e}"))?;
 76
 77            let entries =
 78                fs::read_dir(".").map_err(|e| format!("failed to list working directory {e}"))?;
 79            for entry in entries {
 80                let entry = entry.map_err(|e| format!("failed to load directory entry {e}"))?;
 81                if entry.file_name().to_str() != Some(&version_dir) {
 82                    fs::remove_dir_all(&entry.path()).ok();
 83                }
 84            }
 85        }
 86
 87        self.cached_binary_path = Some(binary_path.clone());
 88        Ok(binary_path)
 89    }
 90}
 91
 92impl zed::Extension for LuaExtension {
 93    fn new() -> Self {
 94        Self {
 95            cached_binary_path: None,
 96        }
 97    }
 98
 99    fn language_server_command(
100        &mut self,
101        language_server_id: &LanguageServerId,
102        worktree: &zed::Worktree,
103    ) -> Result<zed::Command> {
104        Ok(zed::Command {
105            command: self.language_server_binary_path(language_server_id, worktree)?,
106            args: Default::default(),
107            env: Default::default(),
108        })
109    }
110
111    fn label_for_completion(
112        &self,
113        _language_server_id: &LanguageServerId,
114        completion: zed::lsp::Completion,
115    ) -> Option<CodeLabel> {
116        match completion.kind? {
117            CompletionKind::Method | CompletionKind::Function => {
118                let name_len = completion.label.find('(').unwrap_or(completion.label.len());
119                Some(CodeLabel {
120                    spans: vec![CodeLabelSpan::code_range(0..completion.label.len())],
121                    filter_range: (0..name_len).into(),
122                    code: completion.label,
123                })
124            }
125            CompletionKind::Field => Some(CodeLabel {
126                spans: vec![CodeLabelSpan::literal(
127                    completion.label.clone(),
128                    Some("property".into()),
129                )],
130                filter_range: (0..completion.label.len()).into(),
131                code: Default::default(),
132            }),
133            _ => None,
134        }
135    }
136
137    fn label_for_symbol(
138        &self,
139        _language_server_id: &LanguageServerId,
140        symbol: zed::lsp::Symbol,
141    ) -> Option<CodeLabel> {
142        let prefix = "let a = ";
143        let suffix = match symbol.kind {
144            zed::lsp::SymbolKind::Method => "()",
145            _ => "",
146        };
147        let code = format!("{prefix}{}{suffix}", symbol.name);
148        Some(CodeLabel {
149            spans: vec![CodeLabelSpan::code_range(
150                prefix.len()..code.len() - suffix.len(),
151            )],
152            filter_range: (0..symbol.name.len()).into(),
153            code,
154        })
155    }
156}
157
158zed::register_extension!(LuaExtension);