use anyhow::{anyhow, Context, Result};use async_compression::futures::bufread::GzipDecoder;use async_tar::Archive;use async_trait::async_trait;use futures::{io::BufReader, StreamExt};use language::{LanguageServerName, LspAdapter, LspAdapterDelegate};use lsp::LanguageServerBinary;use smol::fs;use std::env::consts::{ARCH, OS};use std::ffi::OsString;use std::{any::Any, path::PathBuf};use util::async_maybe;use util::github::latest_github_release;use util::{github::GitHubLspBinaryVersion, ResultExt}; pub struct ZlsAdapter; #[async_trait]impl LspAdapter for ZlsAdapter {    fn name(&self) -> LanguageServerName {        LanguageServerName("zls".into())    }     async fn fetch_latest_server_version(        &self,        delegate: &dyn LspAdapterDelegate,    ) -> Result<Box<dyn 'static + Send + Any>> {        let release =            latest_github_release("zigtools/zls", true, false, delegate.http_client()).await?;        let asset_name = format!("zls-{ARCH}-{OS}.tar.gz");        let asset = release            .assets            .iter()            .find(|asset| asset.name == asset_name)            .ok_or_else(|| anyhow!("no asset found matching {:?}", asset_name))?;        let version = GitHubLspBinaryVersion {            name: release.tag_name,            url: asset.browser_download_url.clone(),        };         Ok(Box::new(version) as Box<_>)    }     async fn check_if_user_installed(        &self,        delegate: &dyn LspAdapterDelegate,    ) -> Option<LanguageServerBinary> {        let (path, env) = delegate.which_command(OsString::from("zls")).await?;        Some(LanguageServerBinary {            path,            arguments: vec![],            env: Some(env),        })    }     async fn fetch_server_binary(        &self,        version: Box<dyn 'static + Send + Any>,        container_dir: PathBuf,        delegate: &dyn LspAdapterDelegate,    ) -> Result<LanguageServerBinary> {        let version = version.downcast::<GitHubLspBinaryVersion>().unwrap();        let binary_path = container_dir.join("bin/zls");         if fs::metadata(&binary_path).await.is_err() {            let mut response = delegate                .http_client()                .get(&version.url, Default::default(), true)                .await                .context("error downloading release")?;            let decompressed_bytes = GzipDecoder::new(BufReader::new(response.body_mut()));            let archive = Archive::new(decompressed_bytes);            archive.unpack(container_dir).await?;        }         // todo("windows")        #[cfg(not(windows))]        {            fs::set_permissions(                &binary_path,                <fs::Permissions as fs::unix::PermissionsExt>::from_mode(0o755),            )            .await?;        }        Ok(LanguageServerBinary {            path: binary_path,            env: None,            arguments: vec![],        })    }     async fn cached_server_binary(        &self,        container_dir: PathBuf,        _: &dyn LspAdapterDelegate,    ) -> Option<LanguageServerBinary> {        get_cached_server_binary(container_dir).await    }     async fn installation_test_binary(        &self,        container_dir: PathBuf,    ) -> Option<LanguageServerBinary> {        get_cached_server_binary(container_dir)            .await            .map(|mut binary| {                binary.arguments = vec!["--help".into()];                binary            })    }} async fn get_cached_server_binary(container_dir: PathBuf) -> Option<LanguageServerBinary> {    async_maybe!({        let mut last_binary_path = None;        let mut entries = fs::read_dir(&container_dir).await?;        while let Some(entry) = entries.next().await {            let entry = entry?;            if entry.file_type().await?.is_file()                && entry                    .file_name()                    .to_str()                    .map_or(false, |name| name == "zls")            {                last_binary_path = Some(entry.path());            }        }         if let Some(path) = last_binary_path {            Ok(LanguageServerBinary {                path,                env: None,                arguments: Vec::new(),            })        } else {            Err(anyhow!("no cached binary"))        }    })    .await    .log_err()}