Work with the newest rescript package (#106)

Need to find the new package's name for the formatter.

Fixes #104

Author: chenglou

server/src/constants.ts

@@ -9,6 +9,12 @@ export let bscExePartialPath = path.join(
   process.platform,
   "bsc.exe"
 );
+export let bscExeReScriptPartialPath = path.join(
+  "node_modules",
+  "rescript",
+  process.platform,
+  "bsc.exe"
+);
 
 // can't use the native bsb since we might need the watcher -w flag, which is only in the js wrapper
 // export let bsbPartialPath = path.join('node_modules', 'bs-platform', process.platform, 'bsb.exe');

server/src/server.ts

@@ -428,7 +428,7 @@ function onMessage(msg: m.Message) {
         if (bscExeDir === null) {
           let params: p.ShowMessageParams = {
             type: p.MessageType.Error,
-            message: `Cannot find a nearby ${c.bscExePartialPath}. It's needed for formatting.`,
+            message: `Cannot find a nearby bsc.exe in bs-platform or rescript. It's needed for formatting.`,
           };
           let response: m.NotificationMessage = {
             jsonrpc: c.jsonrpcVersion,
@@ -438,7 +438,9 @@ function onMessage(msg: m.Message) {
           send(fakeSuccessResponse);
           send(response);
         } else {
-          let resolvedBscExePath = path.join(bscExeDir, c.bscExePartialPath);
+          let bscExePath1 = path.join(bscExeDir, c.bscExeReScriptPartialPath);
+          let bscExePath2 = path.join(bscExeDir, c.bscExePartialPath);
+          let resolvedBscExePath = fs.existsSync(bscExePath1) ? bscExePath1 : bscExePath2;
           // code will always be defined here, even though technically it can be undefined
           let code = getOpenedFileContent(params.textDocument.uri);
           let formattedResult = utils.formatUsingValidBscExePath(

server/src/utils.ts

@@ -47,8 +47,9 @@ export let findBscExeDirOfFile = (
   source: p.DocumentUri
 ): null | p.DocumentUri => {
   let dir = path.dirname(source);
-  let bscPath = path.join(dir, c.bscExePartialPath);
-  if (fs.existsSync(bscPath)) {
+  let bscExePath1 = path.join(dir, c.bscExeReScriptPartialPath);
+  let bscExePath2 = path.join(dir, c.bscExePartialPath);
+  if (fs.existsSync(bscExePath1) || fs.existsSync(bscExePath2)) {
     return dir;
   } else {
     if (dir === source) {