ensure --list-different + --write reports status code 0 (#5512)

* change exit code for list different and write

* update existing tests

src/cli/util.js

@@ -146,8 +146,8 @@ function listDifferent(context, input, options, filename) {
     if (!prettier.check(input, options)) {
       if (!context.argv["write"]) {
         context.logger.log(filename);
+        process.exitCode = 1;
       }
-      process.exitCode = 1;
     }
   } catch (error) {
     context.logger.error(error.message);
@@ -498,7 +498,9 @@ function formatFiles(context) {
 
     if (context.argv["list-different"] && isDifferent) {
       context.logger.log(filename);
-      process.exitCode = 1;
+      if (!context.argv["write"]) {
+        process.exitCode = 1;
+      }
     }
 
     if (context.argv["write"]) {

tests_integration/__tests__/infer-parser.js

@@ -113,7 +113,7 @@ describe("--write and --list-different with unknown path and no parser", () => {
 
   describe("multiple files", () => {
     runPrettier("cli/infer-parser/", ["--list-different", "--write", "*"]).test(
-      { status: 1 }
+      { status: 0 }
     );
   });
 });

tests_integration/__tests__/piped-output.js

@@ -8,7 +8,7 @@ describe("output with --list-different + unformatted differs when piped", () =>
     ["--write", "--list-different", "--no-color", "unformatted.js"],
     { stdoutIsTTY: true }
   ).test({
-    status: 1
+    status: 0
   });
 
   const result1 = runPrettier(
@@ -16,7 +16,7 @@ describe("output with --list-different + unformatted differs when piped", () =>
     ["--write", "--list-different", "--no-color", "unformatted.js"],
     { stdoutIsTTY: false }
   ).test({
-    status: 1
+    status: 0
   });
 
   expect(result0.stdout.length).toBeGreaterThan(result1.stdout.length);