Make emoji and checkstyle reporter to output report sorted by file name

CHANGELOG.md

@@ -13,7 +13,9 @@
 
 ##### Bug Fixes
 
-* None.
+* `emoji` and `checkstyle` reporter output report sorted by file name.  
+  [norio-nomura](https://github.com/norio-nomura)
+  [#1429](https://github.com/realm/SwiftLint/issues/1429)
 
 ## 0.18.1: Misaligned Drum
 

Source/SwiftLintFramework/Reporters/CheckstyleReporter.swift

@@ -21,6 +21,7 @@ public struct CheckstyleReporter: Reporter {
             "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n<checkstyle version=\"4.3\">",
             violations
                 .group(by: { ($0.location.file ?? "<nopath>").escapedForXML() })
+                .sorted(by: { $0.key < $1.key })
                 .map(generateForViolationFile).joined(),
             "\n</checkstyle>"
         ].joined()

Source/SwiftLintFramework/Reporters/EmojiReporter.swift

@@ -17,9 +17,10 @@ public struct EmojiReporter: Reporter {
     }
 
     public static func generateReport(_ violations: [StyleViolation]) -> String {
-        return violations.group { violation in
-            violation.location.file ?? "Other"
-        }.map(report).joined(separator: "\n")
+        return violations
+            .group(by: { $0.location.file ?? "Other" })
+            .sorted(by: { $0.key < $1.key })
+            .map(report).joined(separator: "\n")
     }
 
     private static func report(for file: String, with violations: [StyleViolation]) -> String {

Tests/SwiftLintFrameworkTests/Resources/CannedCheckstyleReporterOutput.xml

@@ -1,11 +1,11 @@
 <?xml version="1.0" encoding="utf-8"?>
 <checkstyle version="4.3">
+	<file name="&lt;nopath&gt;">
+		<error line="0" column="0" severity="error" message="Colons should be next to the identifier when specifying a type and next to the key in dictionary literals." source="swiftlint.rules.colon"/>
+	</file>
 	<file name="filename">
 		<error line="1" column="2" severity="warning" message="Violation Reason." source="swiftlint.rules.line_length"/>
 		<error line="1" column="2" severity="error" message="Violation Reason." source="swiftlint.rules.line_length"/>
 		<error line="1" column="2" severity="error" message="Shorthand syntactic sugar should be used, i.e. [Int] instead of Array&lt;Int&gt;." source="swiftlint.rules.syntactic_sugar"/>
 	</file>
-	<file name="&lt;nopath&gt;">
-		<error line="0" column="0" severity="error" message="Colons should be next to the identifier when specifying a type and next to the key in dictionary literals." source="swiftlint.rules.colon"/>
-	</file>
 </checkstyle>