languages: Remove lingering Elm file (#14754)

This PR removes a leftover file from when Elm support was done natively.

Elm was extracted into an extension in #10432.

Release Notes:

- N/A

crates/languages/src/elm.rs

@@ -1,155 +0,0 @@
-use anyhow::{anyhow, Result};
-use async_trait::async_trait;
-use futures::StreamExt;
-use gpui::AsyncAppContext;
-use language::{LanguageServerName, LspAdapter, LspAdapterDelegate};
-use lsp::LanguageServerBinary;
-use node_runtime::NodeRuntime;
-use project::project_settings::ProjectSettings;
-use serde_json::Value;
-use settings::Settings;
-use smol::fs;
-use std::{
-    any::Any,
-    ffi::OsString,
-    path::{Path, PathBuf},
-    sync::Arc,
-};
-use util::{maybe, ResultExt};
-
-const SERVER_NAME: &str = "elm-language-server";
-const SERVER_PATH: &str = "node_modules/@elm-tooling/elm-language-server/out/node/index.js";
-
-fn server_binary_arguments(server_path: &Path) -> Vec<OsString> {
-    vec![server_path.into(), "--stdio".into()]
-}
-
-pub struct ElmLspAdapter {
-    node: Arc<dyn NodeRuntime>,
-}
-
-impl ElmLspAdapter {
-    pub fn new(node: Arc<dyn NodeRuntime>) -> Self {
-        ElmLspAdapter { node }
-    }
-}
-
-#[async_trait(?Send)]
-impl LspAdapter for ElmLspAdapter {
-    fn name(&self) -> LanguageServerName {
-        LanguageServerName(SERVER_NAME.into())
-    }
-
-    async fn fetch_latest_server_version(
-        &self,
-        _: &dyn LspAdapterDelegate,
-    ) -> Result<Box<dyn 'static + Any + Send>> {
-        Ok(Box::new(
-            self.node
-                .npm_package_latest_version("@elm-tooling/elm-language-server")
-                .await?,
-        ) as Box<_>)
-    }
-
-    async fn fetch_server_binary(
-        &self,
-        latest_version: Box<dyn 'static + Send + Any>,
-        container_dir: PathBuf,
-        _: &dyn LspAdapterDelegate,
-    ) -> Result<LanguageServerBinary> {
-        let latest_version = latest_version.downcast::<String>().unwrap();
-        let server_path = container_dir.join(SERVER_PATH);
-        let package_name = "@elm-tooling/elm-language-server";
-
-        let should_install_language_server = self
-            .node
-            .should_install_npm_package(package_name, &server_path, &container_dir, &latest_version)
-            .await;
-
-        if should_install_language_server {
-            self.node
-                .npm_install_packages(&container_dir, &[(package_name, latest_version.as_str())])
-                .await?;
-        }
-
-        Ok(LanguageServerBinary {
-            path: self.node.binary_path().await?,
-            env: None,
-            arguments: server_binary_arguments(&server_path),
-        })
-    }
-
-    async fn cached_server_binary(
-        &self,
-        container_dir: PathBuf,
-        _: &dyn LspAdapterDelegate,
-    ) -> Option<LanguageServerBinary> {
-        get_cached_server_binary(container_dir, &*self.node).await
-    }
-
-    async fn installation_test_binary(
-        &self,
-        container_dir: PathBuf,
-    ) -> Option<LanguageServerBinary> {
-        get_cached_server_binary(container_dir, &*self.node).await
-    }
-
-    async fn workspace_configuration(
-        self: Arc<Self>,
-        _: &Arc<dyn LspAdapterDelegate>,
-        cx: &mut AsyncAppContext,
-    ) -> Result<Value> {
-        // elm-language-server expects workspace didChangeConfiguration notification
-        // params to be the same as lsp initialization_options
-        let override_options = cx.update(|cx| {
-            ProjectSettings::get_global(cx)
-                .lsp
-                .get(SERVER_NAME)
-                .and_then(|s| s.initialization_options.clone())
-                .unwrap_or_default()
-        })?;
-
-        Ok(match override_options.clone().as_object_mut() {
-            Some(op) => {
-                // elm-language-server requests workspace configuration
-                // for the `elmLS` section, so we have to nest
-                // another copy of initialization_options there
-                op.insert("elmLS".into(), override_options);
-                serde_json::to_value(op).unwrap_or_default()
-            }
-            None => override_options,
-        })
-    }
-}
-
-async fn get_cached_server_binary(
-    container_dir: PathBuf,
-    node: &dyn NodeRuntime,
-) -> Option<LanguageServerBinary> {
-    maybe!(async {
-        let mut last_version_dir = 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_dir() {
-                last_version_dir = Some(entry.path());
-            }
-        }
-        let last_version_dir = last_version_dir.ok_or_else(|| anyhow!("no cached binary"))?;
-        let server_path = last_version_dir.join(SERVER_PATH);
-        if server_path.exists() {
-            Ok(LanguageServerBinary {
-                path: node.binary_path().await?,
-                env: None,
-                arguments: server_binary_arguments(&server_path),
-            })
-        } else {
-            Err(anyhow!(
-                "missing executable in directory {:?}",
-                last_version_dir
-            ))
-        }
-    })
-    .await
-    .log_err()
-}