1use anyhow::{anyhow, Result};
  2use async_trait::async_trait;
  3use futures::StreamExt;
  4use gpui::AppContext;
  5use language::{LanguageServerName, LspAdapter, LspAdapterDelegate};
  6use lsp::LanguageServerBinary;
  7use node_runtime::NodeRuntime;
  8use project::project_settings::ProjectSettings;
  9use serde_json::Value;
 10use settings::Settings;
 11use smol::fs;
 12use std::{
 13    any::Any,
 14    ffi::OsString,
 15    path::{Path, PathBuf},
 16    sync::Arc,
 17};
 18use util::ResultExt;
 19
 20const SERVER_NAME: &'static str = "elm-language-server";
 21const SERVER_PATH: &'static str = "node_modules/@elm-tooling/elm-language-server/out/node/index.js";
 22
 23fn server_binary_arguments(server_path: &Path) -> Vec<OsString> {
 24    vec![server_path.into(), "--stdio".into()]
 25}
 26
 27pub struct ElmLspAdapter {
 28    node: Arc<dyn NodeRuntime>,
 29}
 30
 31impl ElmLspAdapter {
 32    pub fn new(node: Arc<dyn NodeRuntime>) -> Self {
 33        ElmLspAdapter { node }
 34    }
 35}
 36
 37#[async_trait]
 38impl LspAdapter for ElmLspAdapter {
 39    fn name(&self) -> LanguageServerName {
 40        LanguageServerName(SERVER_NAME.into())
 41    }
 42
 43    fn short_name(&self) -> &'static str {
 44        "elmLS"
 45    }
 46
 47    async fn fetch_latest_server_version(
 48        &self,
 49        _: &dyn LspAdapterDelegate,
 50    ) -> Result<Box<dyn 'static + Any + Send>> {
 51        Ok(Box::new(
 52            self.node
 53                .npm_package_latest_version("@elm-tooling/elm-language-server")
 54                .await?,
 55        ) as Box<_>)
 56    }
 57
 58    async fn fetch_server_binary(
 59        &self,
 60        version: Box<dyn 'static + Send + Any>,
 61        container_dir: PathBuf,
 62        _: &dyn LspAdapterDelegate,
 63    ) -> Result<LanguageServerBinary> {
 64        let version = version.downcast::<String>().unwrap();
 65        let server_path = container_dir.join(SERVER_PATH);
 66
 67        if fs::metadata(&server_path).await.is_err() {
 68            self.node
 69                .npm_install_packages(
 70                    &container_dir,
 71                    &[("@elm-tooling/elm-language-server", version.as_str())],
 72                )
 73                .await?;
 74        }
 75
 76        Ok(LanguageServerBinary {
 77            path: self.node.binary_path().await?,
 78            env: None,
 79            arguments: server_binary_arguments(&server_path),
 80        })
 81    }
 82
 83    async fn cached_server_binary(
 84        &self,
 85        container_dir: PathBuf,
 86        _: &dyn LspAdapterDelegate,
 87    ) -> Option<LanguageServerBinary> {
 88        get_cached_server_binary(container_dir, &*self.node).await
 89    }
 90
 91    async fn installation_test_binary(
 92        &self,
 93        container_dir: PathBuf,
 94    ) -> Option<LanguageServerBinary> {
 95        get_cached_server_binary(container_dir, &*self.node).await
 96    }
 97
 98    fn workspace_configuration(&self, _workspace_root: &Path, cx: &mut AppContext) -> Value {
 99        // elm-language-server expects workspace didChangeConfiguration notification
100        // params to be the same as lsp initialization_options
101        let override_options = ProjectSettings::get_global(cx)
102            .lsp
103            .get(SERVER_NAME)
104            .and_then(|s| s.initialization_options.clone())
105            .unwrap_or_default();
106
107        match override_options.clone().as_object_mut() {
108            Some(op) => {
109                // elm-language-server requests workspace configuration
110                // for the `elmLS` section, so we have to nest
111                // another copy of initialization_options there
112                op.insert("elmLS".into(), override_options);
113                serde_json::to_value(op).unwrap_or_default()
114            }
115            None => override_options,
116        }
117    }
118}
119
120async fn get_cached_server_binary(
121    container_dir: PathBuf,
122    node: &dyn NodeRuntime,
123) -> Option<LanguageServerBinary> {
124    (|| async move {
125        let mut last_version_dir = None;
126        let mut entries = fs::read_dir(&container_dir).await?;
127        while let Some(entry) = entries.next().await {
128            let entry = entry?;
129            if entry.file_type().await?.is_dir() {
130                last_version_dir = Some(entry.path());
131            }
132        }
133        let last_version_dir = last_version_dir.ok_or_else(|| anyhow!("no cached binary"))?;
134        let server_path = last_version_dir.join(SERVER_PATH);
135        if server_path.exists() {
136            Ok(LanguageServerBinary {
137                path: node.binary_path().await?,
138                env: None,
139                arguments: server_binary_arguments(&server_path),
140            })
141        } else {
142            Err(anyhow!(
143                "missing executable in directory {:?}",
144                last_version_dir
145            ))
146        }
147    })()
148    .await
149    .log_err()
150}