fixed Linux support

Author: colemancda

Package.swift

@@ -5,5 +5,14 @@ let package = Package(
     dependencies: [
         .Package(url: "https://github.com/PureSwift/Cairo.git", majorVersion: 1)
     ],
+    targets: [
+        
+    Target(
+        name: "SilicaTests",
+        dependencies: [.Target(name: "Silica")]),
+    Target(
+        name: "Silica")
+        
+    ],
     exclude: ["Xcode"]
 )

Sources/Silica/Font.swift

@@ -161,7 +161,7 @@ private func FcPattern(name: String) -> (pointer: OpaquePointer, family: String)
         // should free memory, but crashes
         // defer { free(traitsCString) }
 
-        let traitsString = String(utf8String: trimmedCString)!
+        let traitsString = String(cString: trimmedCString)
 
         let familyLength = name.utf8.count - traitsString.utf8.count - 1 // for separator
 
@@ -231,3 +231,11 @@ internal extension String {
         return String(utf8[indexRange])
     }
 }
+
+internal extension String {
+    
+    func contains(_ other: String) -> Bool {
+        
+        return strstr(self, other) != nil
+    }
+}

Sources/SilicaTests/FontTests.swift

@@ -15,7 +15,7 @@ final class FontTests: XCTestCase {
 
     func testCreateSimpleFont() {
 
-        guard let font = Font(name: "MicrosoftSansSerif")
+        guard let font = Silica.Font(name: "MicrosoftSansSerif")
             else { XCTFail("Could not create font"); return }
 
         let expectedFullName = "Microsoft Sans Serif"
@@ -26,7 +26,7 @@ final class FontTests: XCTestCase {
 
     func testCreateTraitFont() {
 
-        guard let font = Font(name: "MicrosoftSansSerif-Bold")
+        guard let font = Silica.Font(name: "MicrosoftSansSerif-Bold")
             else { XCTFail("Could not create font"); return }
 
         let expectedFullName = "Microsoft Sans Serif"

Xcode/Silica/Silica.xcodeproj/project.pbxproj

@@ -85,6 +85,7 @@
 		6E5041631CE8F13C0087E9A3 /* CGPath.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = CGPath.swift; sourceTree = "<group>"; };
 		6E5041641CE8F13C0087E9A3 /* CoreGraphics.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = CoreGraphics.swift; sourceTree = "<group>"; };
 		6E572EB91CDFE21E002E245A /* AffineTransform.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = AffineTransform.swift; sourceTree = "<group>"; };
+		6EC4D07E1D031435009E499F /* Package.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; name = Package.swift; path = ../../Package.swift; sourceTree = "<group>"; };
 		6EEFFEAE1CE0797900515526 /* Color.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Color.swift; sourceTree = "<group>"; };
 		6EEFFEB01CE07B6B00515526 /* Font.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Font.swift; sourceTree = "<group>"; };
 		6EEFFEB21CE07BDE00515526 /* DrawingMode.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = DrawingMode.swift; sourceTree = "<group>"; };
@@ -133,6 +134,7 @@
 		6E339B5F1CDFC492008E399E = {
 			isa = PBXGroup;
 			children = (
+				6EC4D07E1D031435009E499F /* Package.swift */,
 				6E169A5B1CE428ED00C60B0B /* Dependencies */,
 				6E339B831CDFC663008E399E /* Sources */,
 				6E339B6B1CDFC492008E399E /* Silica */,