From 68408f38382163291b23e6aec2985f858d2a381c Mon Sep 17 00:00:00 2001
From: Julia <floc@unpromptedtirade.com>
Date: Tue, 22 Aug 2023 23:50:40 -0400
Subject: [PATCH] Add VSCode CSS language server & add Tailwind to .css files

---
 crates/zed/src/languages.rs     |  10 ++-
 crates/zed/src/languages/css.rs | 126 ++++++++++++++++++++++++++++++++
 2 files changed, 135 insertions(+), 1 deletion(-)
 create mode 100644 crates/zed/src/languages/css.rs

diff --git a/crates/zed/src/languages.rs b/crates/zed/src/languages.rs
index 2cdd540e8a26fe55a4ed4a3947541e49f863d4c8..42b62cdfa96aef5f2eaf25419a9e5a34bb8c66ec 100644
--- a/crates/zed/src/languages.rs
+++ b/crates/zed/src/languages.rs
@@ -6,6 +6,7 @@ use std::{borrow::Cow, str, sync::Arc};
 use util::asset_str;
 
 mod c;
+mod css;
 mod elixir;
 mod go;
 mod html;
@@ -52,7 +53,14 @@ pub fn init(languages: Arc<LanguageRegistry>, node_runtime: Arc<NodeRuntime>) {
         tree_sitter_cpp::language(),
         vec![Arc::new(c::CLspAdapter)],
     );
-    language("css", tree_sitter_css::language(), vec![]);
+    language(
+        "css",
+        tree_sitter_css::language(),
+        vec![
+            Arc::new(css::CssLspAdapter::new(node_runtime.clone())),
+            Arc::new(tailwind::TailwindLspAdapter::new(node_runtime.clone())),
+        ],
+    );
     language(
         "elixir",
         tree_sitter_elixir::language(),
diff --git a/crates/zed/src/languages/css.rs b/crates/zed/src/languages/css.rs
new file mode 100644
index 0000000000000000000000000000000000000000..51db8b8ab8dac4b8fac0985bdbd08a8d2e4faa3c
--- /dev/null
+++ b/crates/zed/src/languages/css.rs
@@ -0,0 +1,126 @@
+use anyhow::{anyhow, Result};
+use async_trait::async_trait;
+use futures::StreamExt;
+use language::{LanguageServerName, LspAdapter, LspAdapterDelegate};
+use lsp::LanguageServerBinary;
+use node_runtime::NodeRuntime;
+use serde_json::json;
+use smol::fs;
+use std::{
+    any::Any,
+    ffi::OsString,
+    path::{Path, PathBuf},
+    sync::Arc,
+};
+use util::ResultExt;
+
+const SERVER_PATH: &'static str =
+    "node_modules/vscode-langservers-extracted/bin/vscode-css-language-server";
+
+fn server_binary_arguments(server_path: &Path) -> Vec<OsString> {
+    vec![server_path.into(), "--stdio".into()]
+}
+
+pub struct CssLspAdapter {
+    node: Arc<NodeRuntime>,
+}
+
+impl CssLspAdapter {
+    pub fn new(node: Arc<NodeRuntime>) -> Self {
+        CssLspAdapter { node }
+    }
+}
+
+#[async_trait]
+impl LspAdapter for CssLspAdapter {
+    async fn name(&self) -> LanguageServerName {
+        LanguageServerName("vscode-css-language-server".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("vscode-langservers-extracted")
+                .await?,
+        ) as Box<_>)
+    }
+
+    async fn fetch_server_binary(
+        &self,
+        version: Box<dyn 'static + Send + Any>,
+        container_dir: PathBuf,
+        _: &dyn LspAdapterDelegate,
+    ) -> Result<LanguageServerBinary> {
+        let version = version.downcast::<String>().unwrap();
+        let server_path = container_dir.join(SERVER_PATH);
+
+        if fs::metadata(&server_path).await.is_err() {
+            self.node
+                .npm_install_packages(
+                    &container_dir,
+                    [("vscode-langservers-extracted", version.as_str())],
+                )
+                .await?;
+        }
+
+        Ok(LanguageServerBinary {
+            path: self.node.binary_path().await?,
+            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 initialization_options(&self) -> Option<serde_json::Value> {
+        Some(json!({
+            "provideFormatter": true
+        }))
+    }
+}
+
+async fn get_cached_server_binary(
+    container_dir: PathBuf,
+    node: &NodeRuntime,
+) -> Option<LanguageServerBinary> {
+    (|| async move {
+        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?,
+                arguments: server_binary_arguments(&server_path),
+            })
+        } else {
+            Err(anyhow!(
+                "missing executable in directory {:?}",
+                last_version_dir
+            ))
+        }
+    })()
+    .await
+    .log_err()
+}