fix changed not saved to the file

editorconfig/fix_command.go

@@ -50,12 +50,18 @@ func FixCommand(c *cli.Context) error {
 		// Run line checkers and fixers.
 		lines := SplitIntoLines(fileContent)
 		lineNo := 1
-		for _, line := range lines {
+		for i, line := range lines {
 			for ruleName, ruleValue := range rules {
 				if lineChecker, ok := lineCheckers[ruleName]; ok {
 					result := lineChecker(ruleValue, line)
 					if !result.isOk {
-						fmt.Println(f + ": line " + strconv.Itoa(lineNo) + ": " + ruleName + ": " + result.messageIfNotOk)
+						if result.fixer != nil {
+							lines[i] = result.fixer(ruleValue, line)
+							hasChanged = true
+							fmt.Println(f + ": line " + strconv.Itoa(lineNo) + ": " + ruleName + ": fixed")
+						} else {
+							fmt.Println(f + ": line " + strconv.Itoa(lineNo) + ": " + ruleName + ": " + result.messageIfNotOk)
+						}
 						// Don't show more than 1 error per line.
 						break
 					}
@@ -63,14 +69,19 @@ func FixCommand(c *cli.Context) error {
 			}
 			lineNo++
 		}
+		
+		// Rejoin the lines if any were changed
+		if hasChanged {
+			fileContent = strings.Join(lines, "\n")
+		}
 
 		if hasChanged {
-			fileHandler, err := os.Open(f)
+			err := os.WriteFile(f, []byte(fileContent), 0644)
 			if err != nil {
-				fmt.Println("Could not write to " + f)
+				fmt.Println("Could not write to " + f + ": " + err.Error())
+			} else {
+				fmt.Println("Wrote to " + f)
 			}
-			fileHandler.WriteString(fileContent)
-			fmt.Println("Wrote to " + f)
 		}
 	}