Start work on installing gopls

crates/zed/src/languages.rs

@@ -4,6 +4,7 @@ use rust_embed::RustEmbed;
 use std::{borrow::Cow, str, sync::Arc};
 
 mod c;
+mod go;
 mod installation;
 mod json;
 mod rust;

crates/zed/src/languages/c.rs

@@ -4,7 +4,11 @@ use client::http::HttpClient;
 use futures::{future::BoxFuture, FutureExt, StreamExt};
 pub use language::*;
 use smol::fs::{self, File};
-use std::{any::Any, path::PathBuf, sync::Arc};
+use std::{
+    any::Any,
+    path::{Path, PathBuf},
+    sync::Arc,
+};
 use util::{ResultExt, TryFutureExt};
 
 pub struct CLspAdapter;
@@ -39,7 +43,7 @@ impl super::LspAdapter for CLspAdapter {
         &self,
         version: Box<dyn 'static + Send + Any>,
         http: Arc<dyn HttpClient>,
-        container_dir: PathBuf,
+        container_dir: Arc<Path>,
     ) -> BoxFuture<'static, Result<PathBuf>> {
         let version = version.downcast::<GitHubLspBinaryVersion>().unwrap();
         async move {
@@ -88,7 +92,10 @@ impl super::LspAdapter for CLspAdapter {
         .boxed()
     }
 
-    fn cached_server_binary(&self, container_dir: PathBuf) -> BoxFuture<'static, Option<PathBuf>> {
+    fn cached_server_binary(
+        &self,
+        container_dir: Arc<Path>,
+    ) -> BoxFuture<'static, Option<PathBuf>> {
         async move {
             let mut last_clangd_dir = None;
             let mut entries = fs::read_dir(&container_dir).await?;

crates/zed/src/languages/go.rs

@@ -0,0 +1,140 @@
+use super::installation::latest_github_release;
+use anyhow::{anyhow, Result};
+use client::http::HttpClient;
+use futures::{future::BoxFuture, FutureExt, StreamExt};
+pub use language::*;
+use lazy_static::lazy_static;
+use regex::Regex;
+use smol::{fs, process};
+use std::{
+    any::Any,
+    path::{Path, PathBuf},
+    str,
+    sync::Arc,
+};
+use util::{ResultExt, TryFutureExt};
+
+#[derive(Copy, Clone)]
+pub struct GoLspAdapter;
+
+lazy_static! {
+    static ref GOPLS_VERSION_REGEX: Regex = Regex::new(r"\d+\.\d+\.\d+").unwrap();
+}
+
+impl super::LspAdapter for GoLspAdapter {
+    fn name(&self) -> LanguageServerName {
+        LanguageServerName("gopls".into())
+    }
+
+    fn fetch_latest_server_version(
+        &self,
+        http: Arc<dyn HttpClient>,
+    ) -> BoxFuture<'static, Result<Box<dyn 'static + Send + Any>>> {
+        async move {
+            let release = latest_github_release("golang/tools", http).await?;
+            let version: Option<String> = release.name.strip_prefix("gopls/v").map(str::to_string);
+            if version.is_none() {
+                log::warn!(
+                    "couldn't infer gopls version from github release name '{}'",
+                    release.name
+                );
+            }
+            Ok(Box::new(version) as Box<_>)
+        }
+        .boxed()
+    }
+
+    fn fetch_server_binary(
+        &self,
+        version: Box<dyn 'static + Send + Any>,
+        _: Arc<dyn HttpClient>,
+        container_dir: Arc<Path>,
+    ) -> BoxFuture<'static, Result<PathBuf>> {
+        let version = version.downcast::<Option<String>>().unwrap();
+        let this = *self;
+
+        async move {
+            if let Some(version) = *version {
+                let binary_path = container_dir.join(&format!("gopls_{version}"));
+                if let Ok(metadata) = fs::metadata(&binary_path).await {
+                    if metadata.is_file() {
+                        if let Some(mut entries) = fs::read_dir(&container_dir).await.log_err() {
+                            while let Some(entry) = entries.next().await {
+                                if let Some(entry) = entry.log_err() {
+                                    let entry_path = entry.path();
+                                    if entry_path.as_path() != binary_path
+                                        && entry.file_name() != "gobin"
+                                    {
+                                        fs::remove_file(&entry_path).await.log_err();
+                                    }
+                                }
+                            }
+                        }
+
+                        return Ok(binary_path.to_path_buf());
+                    }
+                }
+            } else if let Some(path) = this.cached_server_binary(container_dir.clone()).await {
+                return Ok(path.to_path_buf());
+            }
+
+            let gobin_dir = container_dir.join("gobin");
+            fs::create_dir_all(&gobin_dir).await?;
+            let install_output = process::Command::new("go")
+                .env("GO111MODULE", "on")
+                .env("GOBIN", &gobin_dir)
+                .args(["install", "golang.org/x/tools/gopls@latest"])
+                .output()
+                .await?;
+            if !install_output.status.success() {
+                Err(anyhow!("failed to install gopls"))?;
+            }
+
+            let installed_binary_path = gobin_dir.join("gopls");
+            let version_output = process::Command::new(&installed_binary_path)
+                .arg("version")
+                .output()
+                .await
+                .map_err(|e| anyhow!("failed to run installed gopls binary {:?}", e))?;
+            let version_stdout = str::from_utf8(&version_output.stdout)
+                .map_err(|_| anyhow!("gopls version produced invalid utf8"))?;
+            let version = GOPLS_VERSION_REGEX
+                .shortest_match(version_stdout)
+                .ok_or_else(|| anyhow!("failed to parse gopls version output"))?;
+            let binary_path = container_dir.join(&format!("gopls_{version}"));
+            fs::rename(&installed_binary_path, &binary_path).await?;
+
+            Ok(binary_path.to_path_buf())
+        }
+        .boxed()
+    }
+
+    fn cached_server_binary(
+        &self,
+        container_dir: Arc<Path>,
+    ) -> BoxFuture<'static, Option<PathBuf>> {
+        async move {
+            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.starts_with("gopls_"))
+                {
+                    last_binary_path = Some(entry.path());
+                }
+            }
+
+            if let Some(path) = last_binary_path {
+                Ok(path.to_path_buf())
+            } else {
+                Err(anyhow!("no cached binary"))
+            }
+        }
+        .log_err()
+        .boxed()
+    }
+}

crates/zed/src/languages/json.rs

@@ -5,7 +5,11 @@ use language::{LanguageServerName, LspAdapter};
 use serde::Deserialize;
 use serde_json::json;
 use smol::fs;
-use std::{any::Any, path::PathBuf, sync::Arc};
+use std::{
+    any::Any,
+    path::{Path, PathBuf},
+    sync::Arc,
+};
 use util::{ResultExt, TryFutureExt};
 
 pub struct JsonLspAdapter;
@@ -56,7 +60,7 @@ impl LspAdapter for JsonLspAdapter {
         &self,
         version: Box<dyn 'static + Send + Any>,
         _: Arc<dyn HttpClient>,
-        container_dir: PathBuf,
+        container_dir: Arc<Path>,
     ) -> BoxFuture<'static, Result<PathBuf>> {
         let version = version.downcast::<String>().unwrap();
         async move {
@@ -95,7 +99,10 @@ impl LspAdapter for JsonLspAdapter {
         .boxed()
     }
 
-    fn cached_server_binary(&self, container_dir: PathBuf) -> BoxFuture<'static, Option<PathBuf>> {
+    fn cached_server_binary(
+        &self,
+        container_dir: Arc<Path>,
+    ) -> BoxFuture<'static, Option<PathBuf>> {
         async move {
             let mut last_version_dir = None;
             let mut entries = fs::read_dir(&container_dir).await?;

crates/zed/src/languages/rust.rs

@@ -7,7 +7,14 @@ pub use language::*;
 use lazy_static::lazy_static;
 use regex::Regex;
 use smol::fs::{self, File};
-use std::{any::Any, borrow::Cow, env::consts, path::PathBuf, str, sync::Arc};
+use std::{
+    any::Any,
+    borrow::Cow,
+    env::consts,
+    path::{Path, PathBuf},
+    str,
+    sync::Arc,
+};
 use util::{ResultExt, TryFutureExt};
 
 pub struct RustLspAdapter;
@@ -42,7 +49,7 @@ impl LspAdapter for RustLspAdapter {
         &self,
         version: Box<dyn 'static + Send + Any>,
         http: Arc<dyn HttpClient>,
-        container_dir: PathBuf,
+        container_dir: Arc<Path>,
     ) -> BoxFuture<'static, Result<PathBuf>> {
         async move {
             let version = version.downcast::<GitHubLspBinaryVersion>().unwrap();
@@ -79,7 +86,10 @@ impl LspAdapter for RustLspAdapter {
         .boxed()
     }
 
-    fn cached_server_binary(&self, container_dir: PathBuf) -> BoxFuture<'static, Option<PathBuf>> {
+    fn cached_server_binary(
+        &self,
+        container_dir: Arc<Path>,
+    ) -> BoxFuture<'static, Option<PathBuf>> {
         async move {
             let mut last = None;
             let mut entries = fs::read_dir(&container_dir).await?;

crates/zed/src/languages/typescript.rs

@@ -5,7 +5,11 @@ use futures::{future::BoxFuture, FutureExt, StreamExt};
 use language::{LanguageServerName, LspAdapter};
 use serde_json::json;
 use smol::fs;
-use std::{any::Any, path::PathBuf, sync::Arc};
+use std::{
+    any::Any,
+    path::{Path, PathBuf},
+    sync::Arc,
+};
 use util::{ResultExt, TryFutureExt};
 
 pub struct TypeScriptLspAdapter;
@@ -45,7 +49,7 @@ impl LspAdapter for TypeScriptLspAdapter {
         &self,
         versions: Box<dyn 'static + Send + Any>,
         _: Arc<dyn HttpClient>,
-        container_dir: PathBuf,
+        container_dir: Arc<Path>,
     ) -> BoxFuture<'static, Result<PathBuf>> {
         let versions = versions.downcast::<Versions>().unwrap();
         async move {
@@ -88,7 +92,10 @@ impl LspAdapter for TypeScriptLspAdapter {
         .boxed()
     }
 
-    fn cached_server_binary(&self, container_dir: PathBuf) -> BoxFuture<'static, Option<PathBuf>> {
+    fn cached_server_binary(
+        &self,
+        container_dir: Arc<Path>,
+    ) -> BoxFuture<'static, Option<PathBuf>> {
         async move {
             let mut last_version_dir = None;
             let mut entries = fs::read_dir(&container_dir).await?;