Fix printer in uncurried false mode (#6378)

Author: DZakh

CHANGELOG.md

@@ -15,6 +15,7 @@
 #### :bug: Bug Fix
 
 - Fix issue with JSX V4 when component props have the default value with same name. https://github.com/rescript-lang/rescript-compiler/pull/6377
+- Fixed printer with `"uncurried": false` in bsconfig. https://github.com/rescript-lang/rescript-compiler/pull/6378
 
 # 11.0.0-rc.2
 

jscomp/build_tests/uncurried_printer/bsconfig.json

@@ -0,0 +1,6 @@
+{
+  "name": "uncurried_printer",
+  "version": "0.1.0",
+  "sources": ["src"],
+  "uncurried": false
+}

jscomp/build_tests/uncurried_printer/input.js

@@ -0,0 +1,15 @@
+const assert = require("assert");
+const child_process = require("child_process");
+const fs = require("fs");
+const path = require("path");
+
+const expectedContent = `let a = (. b) => b\n`;
+const filePath = path.join(__dirname, "src", "a.res");
+
+fs.writeFileSync(filePath, expectedContent, "utf-8");
+
+child_process.execSync(`../../../rescript format -all`, { cwd: __dirname });
+
+const content = fs.readFileSync(filePath, "utf-8");
+
+assert.equal(content, expectedContent);

jscomp/build_tests/uncurried_printer/src/a.res

@@ -0,0 +1 @@
+let a = (. b) => b

jscomp/syntax/src/res_multi_printer.ml

@@ -1,7 +1,6 @@
 let defaultPrintWidth = 100
 
-(* Determine if the file is in uncurried mode by looking for
-   the fist ancestor .bsconfig and see if it contains "uncurried": false *)
+(* Look at bsconfig.json to set Uncurried or Legacy mode if it contains "uncurried": false *)
 let getUncurriedFromBsconfig ~filename =
   let rec findBsconfig ~dir =
     let bsconfig = Filename.concat dir "bsconfig.json" in
@@ -38,25 +37,26 @@ let getUncurriedFromBsconfig ~filename =
   | None -> ()
   | Some bsconfig ->
     let lines = bsconfig |> String.split_on_char '\n' in
-    let uncurried =
+    let is_legacy_uncurried =
       lines
       |> List.exists (fun line ->
-             let uncurried = ref false in
-             let false_ = ref false in
+             let is_uncurried_option = ref false in
+             let is_option_falsy = ref false in
              let words = line |> String.split_on_char ' ' in
              words
              |> List.iter (fun word ->
                     match word with
-                    | "\"uncurried\"" | "\"uncurried\":" -> uncurried := true
+                    | "\"uncurried\"" | "\"uncurried\":" ->
+                      is_uncurried_option := true
                     | "\"uncurried\":false" | "\"uncurried\":false," ->
-                      uncurried := true;
-                      false_ := true
+                      is_uncurried_option := true;
+                      is_option_falsy := true
                     | "false" | ":false" | "false," | ":false," ->
-                      false_ := true
+                      is_option_falsy := true
                     | _ -> ());
-             not (!uncurried && !false_))
+             !is_uncurried_option && !is_option_falsy)
     in
-    if uncurried then Config.uncurried := Uncurried
+    if not is_legacy_uncurried then Config.uncurried := Uncurried
 
 (* print res files to res syntax *)
 let printRes ~ignoreParseErrors ~isInterface ~filename =