WIP

crates/zed/src/languages/json.rs

@@ -0,0 +1,131 @@
+use anyhow::{anyhow, Context, Result};
+use client::http::HttpClient;
+use futures::{future::BoxFuture, FutureExt, StreamExt};
+use language::{LspAdapter, LspBinaryVersion};
+use serde::Deserialize;
+use serde_json::json;
+use smol::fs;
+use std::{path::PathBuf, sync::Arc};
+use util::ResultExt;
+
+pub struct JsonLspAdapter;
+
+impl JsonLspAdapter {
+    const BIN_PATH: &'static str =
+        "node_modules/vscode-json-languageserver/bin/vscode-json-languageserver";
+}
+
+impl LspAdapter for JsonLspAdapter {
+    fn name(&self) -> &'static str {
+        "vscode-json-languageserver"
+    }
+
+    fn server_args(&self) -> &[&str] {
+        &["--stdio"]
+    }
+
+    fn fetch_latest_server_version(
+        &self,
+        _: Arc<dyn HttpClient>,
+    ) -> BoxFuture<'static, Result<LspBinaryVersion>> {
+        async move {
+            #[derive(Deserialize)]
+            struct NpmInfo {
+                versions: Vec<String>,
+            }
+
+            let output = smol::process::Command::new("npm")
+                .args(["info", "vscode-json-languageserver", "--json"])
+                .output()
+                .await?;
+            if !output.status.success() {
+                Err(anyhow!("failed to execute npm info"))?;
+            }
+            let mut info: NpmInfo = serde_json::from_slice(&output.stdout)?;
+
+            Ok(LspBinaryVersion {
+                name: info
+                    .versions
+                    .pop()
+                    .ok_or_else(|| anyhow!("no versions found in npm info"))?,
+                url: Default::default(),
+            })
+        }
+        .boxed()
+    }
+
+    fn fetch_server_binary(
+        &self,
+        version: LspBinaryVersion,
+        _: Arc<dyn HttpClient>,
+        container_dir: PathBuf,
+    ) -> BoxFuture<'static, Result<PathBuf>> {
+        async move {
+            let version_dir = container_dir.join(&version.name);
+            fs::create_dir_all(&version_dir)
+                .await
+                .context("failed to create version directory")?;
+            let binary_path = version_dir.join(Self::BIN_PATH);
+
+            if fs::metadata(&binary_path).await.is_err() {
+                let output = smol::process::Command::new("npm")
+                    .current_dir(&version_dir)
+                    .arg("install")
+                    .arg(format!("vscode-json-languageserver@{}", version.name))
+                    .output()
+                    .await
+                    .context("failed to run npm install")?;
+                if !output.status.success() {
+                    Err(anyhow!("failed to install vscode-json-languageserver"))?;
+                }
+
+                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() != version_dir {
+                                fs::remove_dir_all(&entry_path).await.log_err();
+                            }
+                        }
+                    }
+                }
+            }
+
+            Ok(binary_path)
+        }
+        .boxed()
+    }
+
+    fn cached_server_binary(&self, container_dir: PathBuf) -> BoxFuture<'static, Option<PathBuf>> {
+        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 bin_path = last_version_dir.join(Self::BIN_PATH);
+            if bin_path.exists() {
+                Ok(bin_path)
+            } else {
+                Err(anyhow!(
+                    "missing executable in directory {:?}",
+                    last_version_dir
+                ))
+            }
+        }
+        .log_err()
+        .boxed()
+    }
+
+    fn process_diagnostics(&self, _: &mut lsp::PublishDiagnosticsParams) {}
+
+    fn initialization_options(&self) -> Option<serde_json::Value> {
+        Some(json!({
+            "provideFormatter": true
+        }))
+    }
+}