using UnrealBuildTool;

using System.IO;

using System.Collections.Generic;

public class UnrealEnginePython : ModuleRules

// leave this string as empty for triggering auto-discovery of python installations...

private string pythonHome = "";

// otherwise specify the path of your python installation

//private string pythonHome = "C:/Program Files/Python36";

// this is an example for Homebrew on Mac

//private string pythonHome = "/usr/local/Cellar/python3/3.6.0/Frameworks/Python.framework/Versions/3.6/";

// on Linux an include;libs syntax is expected:

//private string pythonHome = "/usr/local/include/python3.6;/usr/local/lib/libpython3.6.so"

private string[] windowsKnownPaths =

{

"C:/Program Files/Python36",

"C:/Program Files/Python35",

"C:/Python27",

"C:/IntelPython35"

};

private string[] macKnownPaths =

{

"/Library/Frameworks/Python.framework/Versions/3.6",

"/Library/Frameworks/Python.framework/Versions/3.5",

"/Library/Frameworks/Python.framework/Versions/2.7",

"/System/Library/Frameworks/Python.framework/Versions/3.6",

"/System/Library/Frameworks/Python.framework/Versions/3.5",

"/System/Library/Frameworks/Python.framework/Versions/2.7"

};

private string[] linuxKnownIncludesPaths =

{

"/usr/local/include/python3.6",

"/usr/local/include/python3.6m",

"/usr/local/include/python3.5",

"/usr/local/include/python3.5m",

"/usr/local/include/python2.7",

"/usr/include/python3.6",

"/usr/include/python3.6m",

"/usr/include/python3.5",

"/usr/include/python3.5m",

"/usr/include/python2.7",

};

private string[] linuxKnownLibsPaths =

{

"/usr/local/lib/libpython3.6.so",

"/usr/local/lib/libpython3.6m.so",

"/usr/local/lib/x86_64-linux-gnu/libpython3.6.so",

"/usr/local/lib/x86_64-linux-gnu/libpython3.6m.so",

"/usr/local/lib/libpython3.5.so",

"/usr/local/lib/libpython3.5m.so",

"/usr/local/lib/x86_64-linux-gnu/libpython3.5.so",

"/usr/local/lib/x86_64-linux-gnu/libpython3.5m.so",

"/usr/local/lib/libpython2.7.so",

"/usr/local/lib/x86_64-linux-gnu/libpython2.7.so",

"/usr/lib/libpython3.6.so",

"/usr/lib/libpython3.6m.so",

"/usr/lib/x86_64-linux-gnu/libpython3.6.so",

"/usr/lib/x86_64-linux-gnu/libpython3.6m.so",

"/usr/lib/libpython3.5.so",

"/usr/lib/libpython3.5m.so",

"/usr/lib/x86_64-linux-gnu/libpython3.5.so",

"/usr/lib/x86_64-linux-gnu/libpython3.5m.so",

"/usr/lib/libpython2.7.so",

"/usr/lib/x86_64-linux-gnu/libpython2.7.so",

};

#if WITH_FORWARDED_MODULE_RULES_CTOR

public UnrealEnginePython(ReadOnlyTargetRules Target) : base(Target)

#else

public UnrealEnginePython(TargetInfo Target)

#endif

{

PublicIncludePaths.AddRange(

new string[] {

"UnrealEnginePython/Public",

// ... add public include paths required here ...

}

);

PrivateIncludePaths.AddRange(

new string[] {

"UnrealEnginePython/Private",

// ... add other private include paths required here ...

}

);

PublicDependencyModuleNames.AddRange(

new string[]

{

"Core",

"Sockets",

"Networking"

// ... add other public dependencies that you statically link with here ...

}

);

PrivateDependencyModuleNames.AddRange(

new string[]

{

"CoreUObject",

"Engine",

"InputCore",

"Slate",

"SlateCore",

"MovieScene",

"LevelSequence",

"HTTP",

"UMG",

"AppFramework",

"RHI",

"Voice",

"RenderCore",

"MovieSceneCapture",

"Landscape",

"Foliage"

// ... add private dependencies that you statically link with here ...

}

);

DynamicallyLoadedModuleNames.AddRange(

new string[]

{

// ... add any modules that your module loads dynamically here ...

}

);

#if WITH_FORWARDED_MODULE_RULES_CTOR

if (Target.bBuildEditor)

#else

if (UEBuildConfiguration.bBuildEditor)

#endif

{

PrivateDependencyModuleNames.AddRange(new string[]{

"UnrealEd",

"LevelEditor",

"BlueprintGraph",

"Projects",

"Sequencer",

"SequencerWidgets",

"AssetTools",

"LevelSequenceEditor",

"MovieSceneTools",

"MovieSceneTracks",

"CinematicCamera",

"EditorStyle",

"GraphEditor",

"UMGEditor",

"AIGraph",

"RawMesh",

"DesktopWidgets",

"EditorWidgets",

"FBX",

"Persona",

"PropertyEditor",

"LandscapeEditor",

"MaterialEditor"

});

}

if ((Target.Platform == UnrealTargetPlatform.Win64) || (Target.Platform == UnrealTargetPlatform.Win32))

{

if (pythonHome == "")

{

pythonHome = DiscoverPythonPath(windowsKnownPaths);

if (pythonHome == "")

{

throw new System.Exception("Unable to find Python installation");

}

}

System.Console.WriteLine("Using Python at: " + pythonHome);

PublicIncludePaths.Add(pythonHome);

string libPath = GetWindowsPythonLibFile(pythonHome);

PublicLibraryPaths.Add(Path.GetDirectoryName(libPath));

PublicAdditionalLibraries.Add(libPath);

}

else if (Target.Platform == UnrealTargetPlatform.Mac)

{

if (pythonHome == "")

{

pythonHome = DiscoverPythonPath(macKnownPaths);

if (pythonHome == "")

{

throw new System.Exception("Unable to find Python installation");

}

}

System.Console.WriteLine("Using Python at: " + pythonHome);

PublicIncludePaths.Add(pythonHome);

string libPath = GetMacPythonLibFile(pythonHome);

PublicLibraryPaths.Add(Path.GetDirectoryName(libPath));

PublicDelayLoadDLLs.Add(libPath);

Definitions.Add(string.Format("UNREAL_ENGINE_PYTHON_ON_MAC"));

}

else if (Target.Platform == UnrealTargetPlatform.Linux)

{

if (pythonHome == "")

{

string includesPath = DiscoverLinuxPythonIncludesPath();

if (includesPath == null)

{

throw new System.Exception("Unable to find Python includes, please add a search path to linuxKnownIncludesPaths");

}

string libsPath = DiscoverLinuxPythonLibsPath();

if (libsPath == null)

{

throw new System.Exception("Unable to find Python libs, please add a search path to linuxKnownLibsPaths");

}

PublicIncludePaths.Add(includesPath);

PublicAdditionalLibraries.Add(libsPath);

}

else

{

string[] items = pythonHome.Split(';');

PublicIncludePaths.Add(items[0]);

PublicAdditionalLibraries.Add(items[1]);

}

Definitions.Add(string.Format("UNREAL_ENGINE_PYTHON_ON_LINUX"));

}

string enableThreads = System.Environment.GetEnvironmentVariable("UEP_ENABLE_THREADS");

if (!string.IsNullOrEmpty(enableThreads))

{

Definitions.Add("UEPY_THREADING");

System.Console.WriteLine("*** Enabled Python Threads support ***");

}

}

private bool IsPathRelative(string Path)

{

bool IsRooted = Path.StartsWith("\\", System.StringComparison.Ordinal) || // Root of the current directory on Windows. Also covers "\\" for UNC or "network" paths.

Path.StartsWith("/", System.StringComparison.Ordinal) || // Root of the current directory on Windows, root on UNIX-likes.

// Also covers "\\", considering normalization replaces "\\" with "//".

(Path.Length >= 2 && char.IsLetter(Path[0]) && Path[1] == ':'); // Starts with "<DriveLetter>:"

return !IsRooted;

}

private string DiscoverPythonPath(string[] knownPaths)

{

// insert the PYTHONHOME content as the first known path

List<string> paths = new List<string>(knownPaths);

string environmentPath = System.Environment.GetEnvironmentVariable("PYTHONHOME");

if (!string.IsNullOrEmpty(environmentPath))

paths.Insert(0, environmentPath);

foreach (string path in paths)

{

string actualPath = path;

if (IsPathRelative(actualPath))

{

actualPath = Path.GetFullPath(Path.Combine(ModuleDirectory, actualPath));

}

string headerFile = Path.Combine(actualPath, "include", "Python.h");

if (File.Exists(headerFile))

{

return actualPath;

}

// this is mainly useful for OSX

headerFile = Path.Combine(actualPath, "Headers", "Python.h");

if (File.Exists(headerFile))

{

return actualPath;

}

}

return "";

}

private string DiscoverLinuxPythonIncludesPath()

{

foreach (string path in linuxKnownIncludesPaths)

{

string headerFile = Path.Combine(path, "Python.h");

if (File.Exists(headerFile))

{

return path;

}

}

return null;

}

private string DiscoverLinuxPythonLibsPath()

{

foreach (string path in linuxKnownLibsPaths)

{

if (File.Exists(path))

{

return path;

}

}

return null;

}

private string GetMacPythonLibFile(string basePath)

{

// first try with python3

for (int i = 9; i >= 0; i--)

{

string fileName = string.Format("libpython3.{0}.dylib", i);

string fullPath = Path.Combine(basePath, "lib", fileName);

if (File.Exists(fullPath))

{

return fullPath;

}

fileName = string.Format("libpython3.{0}m.dylib", i);

fullPath = Path.Combine(basePath, "lib", fileName);

if (File.Exists(fullPath))

{

return fullPath;

}

}

// then python2

for (int i = 9; i >= 0; i--)

{

string fileName = string.Format("libpython2.{0}.dylib", i);

string fullPath = Path.Combine(basePath, "lib", fileName);

if (File.Exists(fullPath))

{

return fullPath;

}

fileName = string.Format("libpython2.{0}m.dylib", i);

fullPath = Path.Combine(basePath, "lib", fileName);

if (File.Exists(fullPath))

{

return fullPath;

}

}

throw new System.Exception("Invalid Python installation, missing .dylib files");

}

private string GetWindowsPythonLibFile(string basePath)

{

// just for usability, report if the pythonHome is not in the system path

string[] allPaths = System.Environment.GetEnvironmentVariable("PATH").Split(';');

// this will transform the slashes in backslashes...

string checkedPath = Path.GetFullPath(basePath);

if (checkedPath.EndsWith("\\"))

{

checkedPath = checkedPath.Remove(checkedPath.Length - 1);

}

bool found = false;

foreach (string item in allPaths)

{

if (item == checkedPath || item == checkedPath + "\\")

{

found = true;

break;

}

}

if (!found)

{

System.Console.WriteLine("[WARNING] Your Python installation is not in the system PATH environment variable.");

System.Console.WriteLine("[WARNING] Ensure your python paths are set in GlobalConfig (DefaultEngine.ini) so the path can be corrected at runtime.");

}

// first try with python3

for (int i = 9; i >= 0; i--)

{

string fileName = string.Format("python3{0}.lib", i);

string fullPath = Path.Combine(basePath, "libs", fileName);

if (File.Exists(fullPath))

{

return fullPath;

}

}

// then python2

for (int i = 9; i >= 0; i--)

{

string fileName = string.Format("python2{0}.lib", i);

string fullPath = Path.Combine(basePath, "libs", fileName);

if (File.Exists(fullPath))

{

return fullPath;

}

}

throw new System.Exception("Invalid Python installation, missing .lib files");

}