Require prettier argument and library in the wrapper

crates/prettier/prettier_server/src/index.js

@@ -1,4 +1,36 @@
 const { Buffer } = require('buffer');
+const fs = require("fs");
+const path = require("path");
+
+let prettierContainerPath = process.argv[2];
+if (prettierContainerPath == null || prettierContainerPath.length == 0) {
+    console.error(`Prettier path argument was not specified or empty.\nUsage: ${process.argv[0]} ${process.argv[1]} prettier/path`);
+    process.exit(1);
+}
+fs.stat(prettierContainerPath, (err, stats) => {
+    if (err) {
+        console.error(`Path '${prettierContainerPath}' does not exist.`);
+        process.exit(1);
+    }
+
+    if (!stats.isDirectory()) {
+        console.log(`Path '${prettierContainerPath}' exists but is not a directory.`);
+        process.exit(1);
+    }
+});
+let prettierPath = path.join(prettierContainerPath, 'node_modules/prettier');
+
+(async () => {
+    let prettier;
+    try {
+        prettier = await loadPrettier(prettierPath);
+    } catch (error) {
+        console.error(error);
+        process.exit(1);
+    }
+    console.log("Prettier loadded successfully.");
+    // TODO kb do the rest here
+})()
 
 let buffer = Buffer.alloc(0);
 process.stdin.resume();
@@ -28,14 +60,15 @@ function handleData() {
     try {
         const message = JSON.parse(bytes);
         handleMessage(message);
-    } catch (_) {
-        sendResponse(makeError("Request JSON parse error"));
+    } catch (e) {
+        sendResponse(makeError(`Request JSON parse error: ${e}`));
         return;
     }
 }
 
 // format
 // clear_cache
+//
 // shutdown
 // error
 
@@ -55,3 +88,19 @@ function sendResponse(response) {
     process.stdout.write(length);
     process.stdout.write(message);
 }
+
+function loadPrettier(prettierPath) {
+    return new Promise((resolve, reject) => {
+        fs.access(prettierPath, fs.constants.F_OK, (err) => {
+            if (err) {
+                reject(`Path '${prettierPath}' does not exist.Error: ${err}`);
+            } else {
+                try {
+                    resolve(require(prettierPath));
+                } catch (err) {
+                    reject(`Error requiring prettier module from path '${prettierPath}'.Error: ${err}`);
+                }
+            }
+        });
+    });
+}