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) = worktree.which("lua-language-server") {
 17            return Ok(path);
 18        }
 19
 20        if let Some(path) = &self.cached_binary_path {
 21            if fs::metadata(path).map_or(false, |stat| stat.is_file()) {
 22                return Ok(path.clone());
 23            }
 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            "LuaLS/lua-language-server",
 32            zed::GithubReleaseOptions {
 33                require_assets: true,
 34                pre_release: false,
 35            },
 36        )?;
 37
 38        let (platform, arch) = zed::current_platform();
 39        let asset_name = format!(
 40            "lua-language-server-{version}-{os}-{arch}.tar.gz",
 41            version = release.version,
 42            os = match platform {
 43                zed::Os::Mac => "darwin",
 44                zed::Os::Linux => "linux",
 45                zed::Os::Windows => "win32",
 46            },
 47            arch = match arch {
 48                zed::Architecture::Aarch64 => "arm64",
 49                zed::Architecture::X8664 => "x64",
 50                zed::Architecture::X86 => return Err("unsupported platform x86".into()),
 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!("lua-language-server-{}", release.version);
 61        let binary_path = format!("{version_dir}/bin/lua-language-server");
 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
 69            zed::download_file(
 70                &asset.download_url,
 71                &version_dir,
 72                zed::DownloadedFileType::GzipTar,
 73            )
 74            .map_err(|e| format!("failed to download file: {e}"))?;
 75
 76            let entries =
 77                fs::read_dir(".").map_err(|e| format!("failed to list working directory {e}"))?;
 78            for entry in entries {
 79                let entry = entry.map_err(|e| format!("failed to load directory entry {e}"))?;
 80                if entry.file_name().to_str() != Some(&version_dir) {
 81                    fs::remove_dir_all(&entry.path()).ok();
 82                }
 83            }
 84        }
 85
 86        self.cached_binary_path = Some(binary_path.clone());
 87        Ok(binary_path)
 88    }
 89}
 90
 91impl zed::Extension for LuaExtension {
 92    fn new() -> Self {
 93        Self {
 94            cached_binary_path: None,
 95        }
 96    }
 97
 98    fn language_server_command(
 99        &mut self,
100        language_server_id: &LanguageServerId,
101        worktree: &zed::Worktree,
102    ) -> Result<zed::Command> {
103        Ok(zed::Command {
104            command: self.language_server_binary_path(language_server_id, worktree)?,
105            args: Default::default(),
106            env: Default::default(),
107        })
108    }
109
110    fn label_for_completion(
111        &self,
112        _language_server_id: &LanguageServerId,
113        completion: zed::lsp::Completion,
114    ) -> Option<CodeLabel> {
115        match completion.kind? {
116            CompletionKind::Method | CompletionKind::Function => {
117                let name_len = completion.label.find('(').unwrap_or(completion.label.len());
118                Some(CodeLabel {
119                    spans: vec![CodeLabelSpan::code_range(0..completion.label.len())],
120                    filter_range: (0..name_len).into(),
121                    code: completion.label,
122                })
123            }
124            CompletionKind::Field => Some(CodeLabel {
125                spans: vec![CodeLabelSpan::literal(
126                    completion.label.clone(),
127                    Some("property".into()),
128                )],
129                filter_range: (0..completion.label.len()).into(),
130                code: Default::default(),
131            }),
132            _ => None,
133        }
134    }
135
136    fn label_for_symbol(
137        &self,
138        _language_server_id: &LanguageServerId,
139        symbol: zed::lsp::Symbol,
140    ) -> Option<CodeLabel> {
141        let prefix = "let a = ";
142        let suffix = match symbol.kind {
143            zed::lsp::SymbolKind::Method => "()",
144            _ => "",
145        };
146        let code = format!("{prefix}{}{suffix}", symbol.name);
147        Some(CodeLabel {
148            spans: vec![CodeLabelSpan::code_range(
149                prefix.len()..code.len() - suffix.len(),
150            )],
151            filter_range: (0..symbol.name.len()).into(),
152            code,
153        })
154    }
155}
156
157zed::register_extension!(LuaExtension);