1use std::fs;
  2use zed::lsp::CompletionKind;
  3use zed::{serde_json, CodeLabel, CodeLabelSpan, LanguageServerId};
  4use zed_extension_api::{self as zed, Result};
  5
  6struct DenoExtension {
  7    cached_binary_path: Option<String>,
  8}
  9
 10impl DenoExtension {
 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("deno") {
 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            "denoland/deno",
 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            "deno-{arch}-{os}.zip",
 41            arch = match arch {
 42                zed::Architecture::Aarch64 => "aarch64",
 43                zed::Architecture::X8664 => "x86_64",
 44                zed::Architecture::X86 =>
 45                    return Err(format!("unsupported architecture: {arch:?}")),
 46            },
 47            os = match platform {
 48                zed::Os::Mac => "apple-darwin",
 49                zed::Os::Linux => "unknown-linux-gnu",
 50                zed::Os::Windows => "pc-windows-msvc",
 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!("deno-{}", release.version);
 61        let binary_path = format!("{version_dir}/deno");
 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::Zip,
 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 DenoExtension {
 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: vec!["lsp".to_string()],
106            env: Default::default(),
107        })
108    }
109
110    fn language_server_initialization_options(
111        &mut self,
112        _language_server_id: &zed::LanguageServerId,
113        _worktree: &zed::Worktree,
114    ) -> Result<Option<serde_json::Value>> {
115        Ok(Some(serde_json::json!({
116            "provideFormatter": true,
117        })))
118    }
119
120    fn label_for_completion(
121        &self,
122        _language_server_id: &LanguageServerId,
123        completion: zed::lsp::Completion,
124    ) -> Option<CodeLabel> {
125        let highlight_name = match completion.kind? {
126            CompletionKind::Class | CompletionKind::Interface | CompletionKind::Constructor => {
127                "type"
128            }
129            CompletionKind::Constant => "constant",
130            CompletionKind::Function | CompletionKind::Method => "function",
131            CompletionKind::Property | CompletionKind::Field => "property",
132            _ => return None,
133        };
134
135        let len = completion.label.len();
136        let name_span = CodeLabelSpan::literal(completion.label, Some(highlight_name.to_string()));
137
138        Some(zed::CodeLabel {
139            code: Default::default(),
140            spans: if let Some(detail) = completion.detail {
141                vec![
142                    name_span,
143                    CodeLabelSpan::literal(" ", None),
144                    CodeLabelSpan::literal(detail, None),
145                ]
146            } else {
147                vec![name_span]
148            },
149            filter_range: (0..len).into(),
150        })
151    }
152}
153
154zed::register_extension!(DenoExtension);