1use anyhow::{anyhow, Context, Result};
  2use async_compression::futures::bufread::GzipDecoder;
  3use async_tar::Archive;
  4use async_trait::async_trait;
  5use futures::{io::BufReader, StreamExt};
  6use language::{LanguageServerName, LspAdapter, LspAdapterDelegate};
  7use lsp::LanguageServerBinary;
  8use smol::fs;
  9use std::env::consts::{ARCH, OS};
 10use std::ffi::OsString;
 11use std::{any::Any, path::PathBuf};
 12use util::async_maybe;
 13use util::github::latest_github_release;
 14use util::{github::GitHubLspBinaryVersion, ResultExt};
 15
 16pub struct ZlsAdapter;
 17
 18#[async_trait]
 19impl LspAdapter for ZlsAdapter {
 20    fn name(&self) -> LanguageServerName {
 21        LanguageServerName("zls".into())
 22    }
 23
 24    async fn fetch_latest_server_version(
 25        &self,
 26        delegate: &dyn LspAdapterDelegate,
 27    ) -> Result<Box<dyn 'static + Send + Any>> {
 28        let release =
 29            latest_github_release("zigtools/zls", true, false, delegate.http_client()).await?;
 30        let asset_name = format!("zls-{ARCH}-{OS}.tar.gz");
 31        let asset = release
 32            .assets
 33            .iter()
 34            .find(|asset| asset.name == asset_name)
 35            .ok_or_else(|| anyhow!("no asset found matching {:?}", asset_name))?;
 36        let version = GitHubLspBinaryVersion {
 37            name: release.tag_name,
 38            url: asset.browser_download_url.clone(),
 39        };
 40
 41        Ok(Box::new(version) as Box<_>)
 42    }
 43
 44    async fn check_if_user_installed(
 45        &self,
 46        delegate: &dyn LspAdapterDelegate,
 47    ) -> Option<LanguageServerBinary> {
 48        let (path, env) = delegate.which_command(OsString::from("zls")).await?;
 49        Some(LanguageServerBinary {
 50            path,
 51            arguments: vec![],
 52            env: Some(env),
 53        })
 54    }
 55
 56    async fn fetch_server_binary(
 57        &self,
 58        version: Box<dyn 'static + Send + Any>,
 59        container_dir: PathBuf,
 60        delegate: &dyn LspAdapterDelegate,
 61    ) -> Result<LanguageServerBinary> {
 62        let version = version.downcast::<GitHubLspBinaryVersion>().unwrap();
 63        let binary_path = container_dir.join("bin/zls");
 64
 65        if fs::metadata(&binary_path).await.is_err() {
 66            let mut response = delegate
 67                .http_client()
 68                .get(&version.url, Default::default(), true)
 69                .await
 70                .context("error downloading release")?;
 71            let decompressed_bytes = GzipDecoder::new(BufReader::new(response.body_mut()));
 72            let archive = Archive::new(decompressed_bytes);
 73            archive.unpack(container_dir).await?;
 74        }
 75
 76        // todo(windows)
 77        #[cfg(not(windows))]
 78        {
 79            fs::set_permissions(
 80                &binary_path,
 81                <fs::Permissions as fs::unix::PermissionsExt>::from_mode(0o755),
 82            )
 83            .await?;
 84        }
 85        Ok(LanguageServerBinary {
 86            path: binary_path,
 87            env: None,
 88            arguments: vec![],
 89        })
 90    }
 91
 92    async fn cached_server_binary(
 93        &self,
 94        container_dir: PathBuf,
 95        _: &dyn LspAdapterDelegate,
 96    ) -> Option<LanguageServerBinary> {
 97        get_cached_server_binary(container_dir).await
 98    }
 99
100    async fn installation_test_binary(
101        &self,
102        container_dir: PathBuf,
103    ) -> Option<LanguageServerBinary> {
104        get_cached_server_binary(container_dir)
105            .await
106            .map(|mut binary| {
107                binary.arguments = vec!["--help".into()];
108                binary
109            })
110    }
111}
112
113async fn get_cached_server_binary(container_dir: PathBuf) -> Option<LanguageServerBinary> {
114    async_maybe!({
115        let mut last_binary_path = None;
116        let mut entries = fs::read_dir(&container_dir).await?;
117        while let Some(entry) = entries.next().await {
118            let entry = entry?;
119            if entry.file_type().await?.is_file()
120                && entry
121                    .file_name()
122                    .to_str()
123                    .map_or(false, |name| name == "zls")
124            {
125                last_binary_path = Some(entry.path());
126            }
127        }
128
129        if let Some(path) = last_binary_path {
130            Ok(LanguageServerBinary {
131                path,
132                env: None,
133                arguments: Vec::new(),
134            })
135        } else {
136            Err(anyhow!("no cached binary"))
137        }
138    })
139    .await
140    .log_err()
141}