1use anyhow::{anyhow, Result};
  2use async_trait::async_trait;
  3use futures::StreamExt;
  4use language2::{LanguageServerName, LspAdapter, LspAdapterDelegate};
  5use lsp2::LanguageServerBinary;
  6use node_runtime::NodeRuntime;
  7use serde_json::json;
  8use smol::fs;
  9use std::{
 10    any::Any,
 11    ffi::OsString,
 12    path::{Path, PathBuf},
 13    sync::Arc,
 14};
 15use util::ResultExt;
 16
 17const SERVER_PATH: &'static str = "node_modules/svelte-language-server/bin/server.js";
 18
 19fn server_binary_arguments(server_path: &Path) -> Vec<OsString> {
 20    vec![server_path.into(), "--stdio".into()]
 21}
 22
 23pub struct SvelteLspAdapter {
 24    node: Arc<dyn NodeRuntime>,
 25}
 26
 27impl SvelteLspAdapter {
 28    pub fn new(node: Arc<dyn NodeRuntime>) -> Self {
 29        SvelteLspAdapter { node }
 30    }
 31}
 32
 33#[async_trait]
 34impl LspAdapter for SvelteLspAdapter {
 35    async fn name(&self) -> LanguageServerName {
 36        LanguageServerName("svelte-language-server".into())
 37    }
 38
 39    fn short_name(&self) -> &'static str {
 40        "svelte"
 41    }
 42
 43    async fn fetch_latest_server_version(
 44        &self,
 45        _: &dyn LspAdapterDelegate,
 46    ) -> Result<Box<dyn 'static + Any + Send>> {
 47        Ok(Box::new(
 48            self.node
 49                .npm_package_latest_version("svelte-language-server")
 50                .await?,
 51        ) as Box<_>)
 52    }
 53
 54    async fn fetch_server_binary(
 55        &self,
 56        version: Box<dyn 'static + Send + Any>,
 57        container_dir: PathBuf,
 58        _: &dyn LspAdapterDelegate,
 59    ) -> Result<LanguageServerBinary> {
 60        let version = version.downcast::<String>().unwrap();
 61        let server_path = container_dir.join(SERVER_PATH);
 62
 63        if fs::metadata(&server_path).await.is_err() {
 64            self.node
 65                .npm_install_packages(
 66                    &container_dir,
 67                    &[("svelte-language-server", version.as_str())],
 68                )
 69                .await?;
 70        }
 71
 72        Ok(LanguageServerBinary {
 73            path: self.node.binary_path().await?,
 74            arguments: server_binary_arguments(&server_path),
 75        })
 76    }
 77
 78    async fn cached_server_binary(
 79        &self,
 80        container_dir: PathBuf,
 81        _: &dyn LspAdapterDelegate,
 82    ) -> Option<LanguageServerBinary> {
 83        get_cached_server_binary(container_dir, &*self.node).await
 84    }
 85
 86    async fn installation_test_binary(
 87        &self,
 88        container_dir: PathBuf,
 89    ) -> Option<LanguageServerBinary> {
 90        get_cached_server_binary(container_dir, &*self.node).await
 91    }
 92
 93    async fn initialization_options(&self) -> Option<serde_json::Value> {
 94        Some(json!({
 95            "provideFormatter": true
 96        }))
 97    }
 98
 99    fn prettier_plugins(&self) -> &[&'static str] {
100        &["prettier-plugin-svelte"]
101    }
102}
103
104async fn get_cached_server_binary(
105    container_dir: PathBuf,
106    node: &dyn NodeRuntime,
107) -> Option<LanguageServerBinary> {
108    (|| async move {
109        let mut last_version_dir = None;
110        let mut entries = fs::read_dir(&container_dir).await?;
111        while let Some(entry) = entries.next().await {
112            let entry = entry?;
113            if entry.file_type().await?.is_dir() {
114                last_version_dir = Some(entry.path());
115            }
116        }
117        let last_version_dir = last_version_dir.ok_or_else(|| anyhow!("no cached binary"))?;
118        let server_path = last_version_dir.join(SERVER_PATH);
119        if server_path.exists() {
120            Ok(LanguageServerBinary {
121                path: node.binary_path().await?,
122                arguments: server_binary_arguments(&server_path),
123            })
124        } else {
125            Err(anyhow!(
126                "missing executable in directory {:?}",
127                last_version_dir
128            ))
129        }
130    })()
131    .await
132    .log_err()
133}