Update to Swift 4 package format

Package.swift

@@ -1,10 +1,18 @@
+// swift-tools-version:4.0
+
 import PackageDescription
 
 let package = Package(
     name: "Atk",
+    products: [
+        .library(name: "Atk", targets: ["Atk"]),
+    ],
     dependencies: [
-        .Package(url: "https://github.com/rhx/CAtk.git", majorVersion: 1),
-        .Package(url: "https://github.com/rhx/SwiftGObject.git", majorVersion: 2)
+        .package(url: "https://github.com/rhx/CAtk.git", .branch("master")),
+        .package(url: "https://github.com/rhx/SwiftGObject.git", .branch("master"))
     ],
-    swiftLanguageVersions: [3, 4]
+    targets: [
+        .target(name: "Atk", dependencies: ["GLibObject"]),
+        .testTarget(name: "AtkTests", dependencies: ["Atk"]),
+    ]
 )

config.sh

@@ -3,8 +3,9 @@
 # Configuration for the module to compile, the Swift toolchain, and
 # the compiler and linker flags to use.
 #
-Mod=Atk
-Module=${Mod}-1.0
+VER=1.0
+Mod=`grep name: Package.swift | head -n1 | cut -d'"' -f2`
+Module=${Mod}-${VER}
 module=`echo "${Module}" | tr '[:upper:]' '[:lower:]'`
 mod=`echo "${Mod}" | tr '[:upper:]' '[:lower:]'`
 BUILD_DIR=`pwd`/.build

distclean.sh

@@ -4,4 +4,4 @@
 #
 . ./config.sh
 ./clean.sh
-exec rm -rf Package.pins Packages Sources/${Module}.swift Sources/Swift${Mod}.swift ${Mod}.xcodeproj
+exec rm -rf Package.pins Packages Sources/${Mod}/${Module}.swift Sources/${Mod}/Swift${Mod}.swift ${Mod}.xcodeproj

gir-to-swift.sh

@@ -21,8 +21,8 @@ if [ ! -e "${GIR}" ] ; then
 	echo "and can be found in /usr /usr/local or by pkg-config!"
 	exit 1
 fi
-gir2swift -o Sources -m ${Module}.module -p ${GIR_DIR}/GObject-2.0.gir -p ${GIR_DIR}/GLib-2.0.gir -p ${GIR_DIR}/GObject-2.0.gir -p ${GIR_DIR}/GModule-2.0.gir -p ${GIR_DIR}/Gio-2.0.gir "${GIR}"
-for src in Sources/*-*.swift ; do
+gir2swift -o Sources/${Mod} -m ${Module}.module -p ${GIR_DIR}/GObject-2.0.gir -p ${GIR_DIR}/GLib-2.0.gir -p ${GIR_DIR}/GObject-2.0.gir -p ${GIR_DIR}/GModule-2.0.gir -p ${GIR_DIR}/Gio-2.0.gir "${GIR}"
+for src in Sources/${Mod}/*-*.swift ; do
 	sed -f ${Module}.sed < ${src} > ${src}.out
 	mv ${src}.out ${src}
 done

xcodegen.sh

@@ -5,7 +5,7 @@
 # and pass them to subprojects, based on the configured -I flags.
 #
 . ./config.sh
-[ -e Sources/${Module}.swift ] || ./generate-wrapper.sh
+[ -e Sources/${Mod}/${Module}.swift ] || ./generate-wrapper.sh
 ./package.sh generate-xcodeproj "$@"
 [ ! -e ${Mod}.xcodeproj/Configs ] ||					   \
 ( cd ${Mod}.xcodeproj/Configs						&& \