1use std::fs;
  2use zed_extension_api::{self as zed, settings::LspSettings, LanguageServerId, Result};
  3
  4struct OmnisharpBinary {
  5    path: String,
  6    args: Option<Vec<String>>,
  7}
  8
  9struct CsharpExtension {
 10    cached_binary_path: Option<String>,
 11}
 12
 13impl CsharpExtension {
 14    fn language_server_binary(
 15        &mut self,
 16        language_server_id: &LanguageServerId,
 17        worktree: &zed::Worktree,
 18    ) -> Result<OmnisharpBinary> {
 19        let binary_settings = LspSettings::for_worktree("omnisharp", worktree)
 20            .ok()
 21            .and_then(|lsp_settings| lsp_settings.binary);
 22        let binary_args = binary_settings
 23            .as_ref()
 24            .and_then(|binary_settings| binary_settings.arguments.clone());
 25
 26        if let Some(path) = binary_settings.and_then(|binary_settings| binary_settings.path) {
 27            return Ok(OmnisharpBinary {
 28                path,
 29                args: binary_args,
 30            });
 31        }
 32
 33        if let Some(path) = worktree.which("OmniSharp") {
 34            return Ok(OmnisharpBinary {
 35                path,
 36                args: binary_args,
 37            });
 38        }
 39
 40        if let Some(path) = &self.cached_binary_path {
 41            if fs::metadata(path).map_or(false, |stat| stat.is_file()) {
 42                return Ok(OmnisharpBinary {
 43                    path: path.clone(),
 44                    args: binary_args,
 45                });
 46            }
 47        }
 48
 49        zed::set_language_server_installation_status(
 50            language_server_id,
 51            &zed::LanguageServerInstallationStatus::CheckingForUpdate,
 52        );
 53        let release = zed::latest_github_release(
 54            "OmniSharp/omnisharp-roslyn",
 55            zed::GithubReleaseOptions {
 56                require_assets: true,
 57                pre_release: false,
 58            },
 59        )?;
 60
 61        let (platform, arch) = zed::current_platform();
 62        let asset_name = format!(
 63            "omnisharp-{os}-{arch}-net6.0.{extension}",
 64            os = match platform {
 65                zed::Os::Mac => "osx",
 66                zed::Os::Linux => "linux",
 67                zed::Os::Windows => "win",
 68            },
 69            arch = match arch {
 70                zed::Architecture::Aarch64 => "arm64",
 71                zed::Architecture::X86 => "x86",
 72                zed::Architecture::X8664 => "x64",
 73            },
 74            extension = match platform {
 75                zed::Os::Mac | zed::Os::Linux => "tar.gz",
 76                zed::Os::Windows => "zip",
 77            }
 78        );
 79
 80        let asset = release
 81            .assets
 82            .iter()
 83            .find(|asset| asset.name == asset_name)
 84            .ok_or_else(|| format!("no asset found matching {:?}", asset_name))?;
 85
 86        let version_dir = format!("omnisharp-{}", release.version);
 87        let binary_path = format!("{version_dir}/OmniSharp");
 88
 89        if !fs::metadata(&binary_path).map_or(false, |stat| stat.is_file()) {
 90            zed::set_language_server_installation_status(
 91                language_server_id,
 92                &zed::LanguageServerInstallationStatus::Downloading,
 93            );
 94
 95            zed::download_file(
 96                &asset.download_url,
 97                &version_dir,
 98                match platform {
 99                    zed::Os::Mac | zed::Os::Linux => zed::DownloadedFileType::GzipTar,
100                    zed::Os::Windows => zed::DownloadedFileType::Zip,
101                },
102            )
103            .map_err(|e| format!("failed to download file: {e}"))?;
104
105            let entries =
106                fs::read_dir(".").map_err(|e| format!("failed to list working directory {e}"))?;
107            for entry in entries {
108                let entry = entry.map_err(|e| format!("failed to load directory entry {e}"))?;
109                if entry.file_name().to_str() != Some(&version_dir) {
110                    fs::remove_dir_all(entry.path()).ok();
111                }
112            }
113        }
114
115        self.cached_binary_path = Some(binary_path.clone());
116        Ok(OmnisharpBinary {
117            path: binary_path,
118            args: binary_args,
119        })
120    }
121}
122
123impl zed::Extension for CsharpExtension {
124    fn new() -> Self {
125        Self {
126            cached_binary_path: None,
127        }
128    }
129
130    fn language_server_command(
131        &mut self,
132        language_server_id: &zed::LanguageServerId,
133        worktree: &zed::Worktree,
134    ) -> Result<zed::Command> {
135        let omnisharp_binary = self.language_server_binary(language_server_id, worktree)?;
136        Ok(zed::Command {
137            command: omnisharp_binary.path,
138            args: omnisharp_binary.args.unwrap_or_else(|| vec!["-lsp".into()]),
139            env: Default::default(),
140        })
141    }
142}
143
144zed::register_extension!(CsharpExtension);