Support use #include <tommath.h> for SwiftPM dependencies

Package.swift

@@ -4,15 +4,15 @@
 import PackageDescription
 
 let package = Package(
-    name: "tommath",
+    name: "TomMath",
     platforms: [
         .macOS(.v10_10), .iOS(.v9), .tvOS(.v9)
     ],
     products: [
         // Products define the executables and libraries a package produces, and make them visible to other packages.
         .library(
             name: "libtommath",
-            targets: ["libtommath"])
+            targets: [ "libtommath" ])
     ],
     dependencies: [
         // Dependencies declare other packages that this package depends on.
@@ -30,10 +30,10 @@ let package = Package(
             cSettings: [
                 .unsafeFlags(["-flto=thin"])  // for Dead Code Elimination
             ]),
-        .testTarget(name: "TommathTests",
-                    dependencies: ["libtommath"],
+        .testTarget(name: "TomMathTests",
+                    dependencies: [ "libtommath" ],
                     path: "demo",
-                    sources: ["tommath_tests.swift"])
+                    sources: [ "tommath_tests.swift" ])
     ],
     cLanguageStandard: .gnu11,
     cxxLanguageStandard: .gnucxx14

demo/tommath_tests.swift

@@ -14,7 +14,7 @@ func mp_get_u32(_ a: UnsafePointer<mp_int>) -> UInt32 {
     return UInt32(bitPattern: mp_get_i32(a))
 }
 
-class LibTommathTests: XCTestCase {
+class TomMathTests: XCTestCase {
 
     override func setUpWithError() throws {
         // Put setup code here. This method is called before the invocation of each test method in the class.

modulemap/module.modulemap

@@ -1,4 +1,4 @@
 module libtommath [extern_c] {
-    header "../tommath.h"
+    header "tommath.h"
     export *
 }

modulemap/tommath.h

@@ -0,0 +1,9 @@
+/*
+* It's necessary for targets which come from package dependencies (C libraries).
+* an additional header search path argument `-I /path/to/this/directory`
+* will automatically added to the include directory.
+*
+* This allows projects to use #include <tommath.h> syntax which are not within the package.
+*/
+
+#include "../tommath.h"