From 59b66edba7e5cfd62eea5d01c95cf10a7a764762 Mon Sep 17 00:00:00 2001
From: polygon <polygon@wh2.tu-dresden.de>
Date: Thu, 10 Jun 2021 00:36:36 +0200
Subject: [PATCH] mlt: Add option to build python bindings

Python bindings are required for flowblade package
Also updated licenses according to copying information
---
 pkgs/development/libraries/mlt/default.nix | 19 ++++++++++++++-----
 pkgs/top-level/python-packages.nix         |  5 +++++
 2 files changed, 19 insertions(+), 5 deletions(-)

diff --git a/pkgs/development/libraries/mlt/default.nix b/pkgs/development/libraries/mlt/default.nix
index 021dc1c3d95f..26c624668a59 100644
--- a/pkgs/development/libraries/mlt/default.nix
+++ b/pkgs/development/libraries/mlt/default.nix
@@ -2,6 +2,7 @@
 , SDL, ffmpeg, frei0r, libjack2, libdv, libsamplerate, libexif
 , libvorbis, libxml2, movit, pkg-config, sox, fftw, opencv4, SDL2
 , gtk2, genericUpdater, common-updater-scripts, libebur128
+, swig, which, ncurses, enablePython ? false, python
 }:
 
 stdenv.mkDerivation rec {
@@ -17,17 +18,20 @@ stdenv.mkDerivation rec {
 
   buildInputs = [
     SDL ffmpeg frei0r libjack2 libdv libsamplerate libvorbis libxml2
-    makeWrapper movit pkg-config sox libexif gtk2 fftw libebur128
-    opencv4 SDL2
-  ];
+    movit sox libexif gtk2 fftw libebur128 opencv4 SDL2
+  ] ++ lib.optional enablePython ncurses;
+
+  nativeBuildInputs = [ pkg-config makeWrapper ]
+  ++ lib.optionals enablePython [ which python swig ];
 
   # Mostly taken from:
   # http://www.kdenlive.org/user-manual/downloading-and-installing-kdenlive/installing-source/installing-mlt-rendering-engine
   configureFlags = [
     "--avformat-swscale" "--enable-gpl" "--enable-gpl3" "--enable-opengl"
-  ];
+  ] ++ lib.optional enablePython "--swig-languages=python";
 
   enableParallelBuilding = true;
+  outPythonPath = lib.optionalString enablePython "$(toPythonPath $out)";
 
   postInstall = ''
     wrapProgram $out/bin/melt --prefix FREI0R_PATH : ${frei0r}/lib/frei0r-1
@@ -36,6 +40,11 @@ stdenv.mkDerivation rec {
     s=${movit.dev}/include
     t=$(for ((i = 0; i < ''${#s}; i++)); do echo -n X; done)
     sed -i $out/lib/mlt/libmltopengl.so -e "s|$s|$t|g"
+  '' + lib.optionalString enablePython ''
+    mkdir -p ${outPythonPath}/mlt
+    cp -a src/swig/python/_mlt.so ${outPythonPath}/mlt/
+    cp -a src/swig/python/mlt.py ${outPythonPath}/mlt/__init__.py
+    sed -i ${outPythonPath}/mlt/__init__.py -e "s|return importlib.import_module('_mlt')|return importlib.import_module('mlt._mlt')|g"
   '';
 
   passthru.updateScript = genericUpdater {
@@ -47,7 +56,7 @@ stdenv.mkDerivation rec {
   meta = with lib; {
     description = "Open source multimedia framework, designed for television broadcasting";
     homepage = "https://www.mltframework.org";
-    license = licenses.gpl3;
+    license = with licenses; [ gpl3Only gpl2Only lgpl21Only ];
     maintainers = with maintainers; [ tohl peti ];
     platforms = platforms.linux;
   };
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 1839e598a155..3758b2cac967 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -4373,6 +4373,11 @@ in {
 
   mlxtend = callPackage ../development/python-modules/mlxtend { };
 
+  mlt = toPythonModule (pkgs.mlt.override {
+    inherit python;
+    enablePython = true;
+  });
+
   mmh3 = callPackage ../development/python-modules/mmh3 { };
 
   mmpython = callPackage ../development/python-modules/mmpython { };