Add lua syntax highlighting and lsp support

crates/zed/src/languages/lua.rs

@@ -0,0 +1,114 @@
+use std::{any::Any, env::consts, path::PathBuf, sync::Arc};
+
+use anyhow::{anyhow, bail, Result};
+use async_compression::futures::bufread::GzipDecoder;
+use async_tar::Archive;
+use async_trait::async_trait;
+use client::http::HttpClient;
+use futures::{io::BufReader, StreamExt};
+use language::LanguageServerName;
+use lazy_static::lazy_static;
+use regex::Regex;
+use smol::fs;
+use util::{async_iife, ResultExt};
+
+use super::installation::{latest_github_release, GitHubLspBinaryVersion};
+
+#[derive(Copy, Clone)]
+pub struct LuaLspAdapter;
+
+lazy_static! {
+    static ref LUALS_VERSION_REGEX: Regex = Regex::new(r"\d+\.\d+\.\d+").unwrap();
+}
+
+#[async_trait]
+impl super::LspAdapter for LuaLspAdapter {
+    async fn name(&self) -> LanguageServerName {
+        LanguageServerName("lua-language-server".into())
+    }
+
+    async fn server_args(&self) -> Vec<String> {
+        vec![
+            "--logpath=~/lua-language-server.log".into(),
+            "--loglevel=trace".into(),
+        ]
+    }
+
+    async fn fetch_latest_server_version(
+        &self,
+        http: Arc<dyn HttpClient>,
+    ) -> Result<Box<dyn 'static + Send + Any>> {
+        let release = latest_github_release("LuaLS/lua-language-server", http).await?;
+        let version = release.name.clone();
+        let platform = match consts::ARCH {
+            "x86_64" => "x64",
+            "aarch64" => "arm64",
+            other => bail!("Running on unsupported platform: {other}"),
+        };
+        let asset_name = format!("lua-language-server-{version}-darwin-{platform}.tar.gz");
+        let asset = release
+            .assets
+            .iter()
+            .find(|asset| asset.name == asset_name)
+            .ok_or_else(|| anyhow!("no asset found matching {:?}", asset_name))?;
+        let version = GitHubLspBinaryVersion {
+            name: release.name.clone(),
+            url: asset.browser_download_url.clone(),
+        };
+        Ok(Box::new(version) as Box<_>)
+    }
+
+    async fn fetch_server_binary(
+        &self,
+        version: Box<dyn 'static + Send + Any>,
+        http: Arc<dyn HttpClient>,
+        container_dir: PathBuf,
+    ) -> Result<PathBuf> {
+        let version = version.downcast::<GitHubLspBinaryVersion>().unwrap();
+
+        let binary_path = container_dir.join("bin/lua-language-server");
+
+        if fs::metadata(&binary_path).await.is_err() {
+            let mut response = http
+                .get(&version.url, Default::default(), true)
+                .await
+                .map_err(|err| anyhow!("error downloading release: {}", err))?;
+            let decompressed_bytes = GzipDecoder::new(BufReader::new(response.body_mut()));
+            let archive = Archive::new(decompressed_bytes);
+            archive.unpack(container_dir).await?;
+        }
+
+        fs::set_permissions(
+            &binary_path,
+            <fs::Permissions as fs::unix::PermissionsExt>::from_mode(0o755),
+        )
+        .await?;
+        Ok(binary_path)
+    }
+
+    async fn cached_server_binary(&self, container_dir: PathBuf) -> Option<PathBuf> {
+        async_iife!({
+            let mut last_binary_path = 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_file()
+                    && entry
+                        .file_name()
+                        .to_str()
+                        .map_or(false, |name| name == "lua-language-server")
+                {
+                    last_binary_path = Some(entry.path());
+                }
+            }
+
+            if let Some(path) = last_binary_path {
+                Ok(path)
+            } else {
+                Err(anyhow!("no cached binary"))
+            }
+        })
+        .await
+        .log_err()
+    }
+}