Drop Swift 4 support

.travis.yml

@@ -1,25 +1,13 @@
 matrix:
  include:
  - os: osx
- osx_image: xcode9.2
- env: SWIFT_VERSION=4.0.3
- - os: osx
- osx_image: xcode9.4
- env: SWIFT_VERSION=4.1
- - os: osx
- osx_image: xcode10
+ osx_image: xcode11.4
  env: SWIFT_VERSION=4.2
  - os: osx
- osx_image: xcode10.2
+ osx_image: xcode11.4
  env: SWIFT_VERSION=5.0
- - os: linux
- env: SWIFT_VERSION=4.0.3
- - os: linux
- env: SWIFT_VERSION=4.1
  - os: linux
  env: SWIFT_VERSION=4.2
- - os: linux
- env: SWIFT_VERSION=4.2.3
  - os: linux
  env: SWIFT_VERSION=5.0
 language: generic

CHANGELOG.md

@@ -4,7 +4,9 @@
 
 ### Breaking
 
-_None_
+- Drop support for Swift < 4.2. For Swift 4 support, you should use Stencil 0.13.1. 
+ [David Jennes](https:/djbe)
+ [#294](https:/stencilproject/Stencil/pull/294)
 
 ### Enhancements
 
@@ -22,7 +24,6 @@ _None_
 - Fixed using parenthesis in boolean expressions, they now can be used without spaces around them. 
  [Ilya Puchka](https:/ilyapuchka)
  [#254](https:/stencilproject/Stencil/pull/254)
-
 - Throw syntax error on empty variable tags (`{{ }}`) instead `fatalError`. 
  [Ilya Puchka](https:/ilyapuchka)
  [#263](https:/stencilproject/Stencil/pull/263)

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version:4.0
+// swift-tools-version:4.2
 import PackageDescription
 
 let package = Package(
@@ -18,5 +18,6 @@ let package = Package(
  "Stencil",
  "Spectre"
  ])
- ]
+ ],
+ swiftLanguageVersions: [.v4_2]
 )

Package@swift-5.swift

@@ -19,5 +19,5 @@ let package = Package(
  "Spectre"
  ])
  ],
- swiftLanguageVersions: [.v4, .v4_2, .v5]
+ swiftLanguageVersions: [.v4_2, .v5]
 )

Sources/_SwiftSupport.swift

@@ -1,42 +1,5 @@
 import Foundation
 
-#if !swift(>=4.1)
- public extension Sequence {
- func compactMap<ElementOfResult>(_ transform: (Element) throws -> ElementOfResult?) rethrows -> [ElementOfResult] {
- return try flatMap(transform)
- }
- }
-#endif
-
-#if !swift(>=4.1)
- public extension Collection {
- func index(_ index: Self.Index, offsetBy offset: Int) -> Self.Index {
- let indexDistance = Self.IndexDistance(offset)
- return self.index(index, offsetBy: indexDistance)
- }
- }
-#endif
-
-#if !swift(>=4.1)
-public extension TemplateSyntaxError {
- public static func == (lhs: TemplateSyntaxError, rhs: TemplateSyntaxError) -> Bool {
- return lhs.reason == rhs.reason &&
- lhs.description == rhs.description &&
- lhs.token == rhs.token &&
- lhs.stackTrace == rhs.stackTrace &&
- lhs.templateName == rhs.templateName
- }
-}
-#endif
-
-#if !swift(>=4.1)
-public extension Variable {
- public static func == (lhs: Variable, rhs: Variable) -> Bool {
- return lhs.variable == rhs.variable
- }
-}
-#endif
-
 #if !swift(>=4.2)
 extension ArraySlice where Element: Equatable {
  func firstIndex(of element: Element) -> Int? {

Stencil.podspec.json

@@ -23,12 +23,12 @@
  "osx": "10.9",
  "tvos": "9.0"
  },
- "cocoapods_version": ">= 1.4.0",
- "swift_version": "5.0",
+ "cocoapods_version": ">= 1.7.0",
+ "swift_versions": ["4.2", "5.0"],
  "requires_arc": true,
  "dependencies": {
  "PathKit": [
- "~> 0.9.0"
+ "~> 1.0.0"
  ]
  }
 }