1use std::fs;
  2use zed::LanguageServerId;
  3use zed_extension_api::settings::LspSettings;
  4use zed_extension_api::{self as zed, Result};
  5
  6struct TaploBinary {
  7    path: String,
  8    args: Option<Vec<String>>,
  9}
 10
 11struct TomlExtension {
 12    cached_binary_path: Option<String>,
 13}
 14
 15impl TomlExtension {
 16    fn language_server_binary(
 17        &mut self,
 18        language_server_id: &LanguageServerId,
 19        worktree: &zed::Worktree,
 20    ) -> Result<TaploBinary> {
 21        let binary_settings = LspSettings::for_worktree("taplo", worktree)
 22            .ok()
 23            .and_then(|lsp_settings| lsp_settings.binary);
 24        let binary_args = binary_settings
 25            .as_ref()
 26            .and_then(|binary_settings| binary_settings.arguments.clone());
 27
 28        if let Some(path) = binary_settings.and_then(|binary_settings| binary_settings.path) {
 29            return Ok(TaploBinary {
 30                path,
 31                args: binary_args,
 32            });
 33        }
 34
 35        if let Some(path) = worktree.which("taplo") {
 36            return Ok(TaploBinary {
 37                path,
 38                args: binary_args,
 39            });
 40        }
 41
 42        if let Some(path) = &self.cached_binary_path
 43            && fs::metadata(path).is_ok_and(|stat| stat.is_file())
 44        {
 45            return Ok(TaploBinary {
 46                path: path.clone(),
 47                args: binary_args,
 48            });
 49        }
 50
 51        zed::set_language_server_installation_status(
 52            language_server_id,
 53            &zed::LanguageServerInstallationStatus::CheckingForUpdate,
 54        );
 55        let release = zed::latest_github_release(
 56            "tamasfe/taplo",
 57            zed::GithubReleaseOptions {
 58                require_assets: true,
 59                pre_release: false,
 60            },
 61        )?;
 62
 63        let (platform, arch) = zed::current_platform();
 64        let asset_name = format!(
 65            "taplo-{os}-{arch}.gz",
 66            arch = match arch {
 67                zed::Architecture::Aarch64 => "aarch64",
 68                zed::Architecture::X86 => "x86",
 69                zed::Architecture::X8664 => "x86_64",
 70            },
 71            os = match platform {
 72                zed::Os::Mac => "darwin",
 73                zed::Os::Linux => "linux",
 74                zed::Os::Windows => "windows",
 75            },
 76        );
 77
 78        let asset = release
 79            .assets
 80            .iter()
 81            .find(|asset| asset.name == asset_name)
 82            .ok_or_else(|| format!("no asset found matching {:?}", asset_name))?;
 83
 84        let version_dir = format!("taplo-{}", release.version);
 85        fs::create_dir_all(&version_dir)
 86            .map_err(|err| format!("failed to create directory '{version_dir}': {err}"))?;
 87
 88        let binary_path = format!(
 89            "{version_dir}/{bin_name}",
 90            bin_name = match platform {
 91                zed::Os::Windows => "taplo.exe",
 92                zed::Os::Mac | zed::Os::Linux => "taplo",
 93            }
 94        );
 95
 96        if !fs::metadata(&binary_path).is_ok_and(|stat| stat.is_file()) {
 97            zed::set_language_server_installation_status(
 98                language_server_id,
 99                &zed::LanguageServerInstallationStatus::Downloading,
100            );
101
102            zed::download_file(
103                &asset.download_url,
104                &binary_path,
105                zed::DownloadedFileType::Gzip,
106            )
107            .map_err(|err| format!("failed to download file: {err}"))?;
108
109            zed::make_file_executable(&binary_path)?;
110
111            let entries = fs::read_dir(".")
112                .map_err(|err| format!("failed to list working directory {err}"))?;
113            for entry in entries {
114                let entry = entry.map_err(|err| format!("failed to load directory entry {err}"))?;
115                if entry.file_name().to_str() != Some(&version_dir) {
116                    fs::remove_dir_all(entry.path()).ok();
117                }
118            }
119        }
120
121        self.cached_binary_path = Some(binary_path.clone());
122        Ok(TaploBinary {
123            path: binary_path,
124            args: binary_args,
125        })
126    }
127}
128
129impl zed::Extension for TomlExtension {
130    fn new() -> Self {
131        Self {
132            cached_binary_path: None,
133        }
134    }
135
136    fn language_server_command(
137        &mut self,
138        language_server_id: &LanguageServerId,
139        worktree: &zed::Worktree,
140    ) -> Result<zed::Command> {
141        let taplo_binary = self.language_server_binary(language_server_id, worktree)?;
142        Ok(zed::Command {
143            command: taplo_binary.path,
144            args: taplo_binary
145                .args
146                .unwrap_or_else(|| vec!["lsp".to_string(), "stdio".to_string()]),
147            env: Default::default(),
148        })
149    }
150}
151
152zed::register_extension!(TomlExtension);