arcan.arcan: fix static openal issues

Arcan has some interesting idiosyncrasies. One of them is using cmake. The other
is using cmake to vendor some low-level, custom-patched dependencies.

In order to work around them, I have created ... a set of custom patches!
And on top of it, I have factored the vendored sources in a separate file, in
order to clean up the `default.nix` file.

6 files changed, 149 insertions, 35 deletions

diff --git a/pkgs/desktops/arcan/arcan/000-openal.patch b/pkgs/desktops/arcan/arcan/000-openal.patch
new file mode 100644
index 00000000000..f8e02a4cb0c
--- /dev/null
+++ b/pkgs/desktops/arcan/arcan/000-openal.patch
@@ -0,0 +1,15 @@
+diff -Naur source-old/src/CMakeLists.txt source-new/src/CMakeLists.txt
+--- source-old/src/CMakeLists.txt	1969-12-31 21:00:01.000000000 -0300
++++ source-new/src/CMakeLists.txt	2021-10-29 12:03:06.461399341 -0300
+@@ -362,10 +360,8 @@
+ 	if (EXISTS ${EXTERNAL_SRC_DIR}/git/openal AND STATIC_OPENAL)
+ 		amsg("${CL_YEL}Building OpenAL static from external/git mirror${CL_RST}")
+ 		ExternalProject_Add(OpenAL
+-			SOURCE_DIR ${CMAKE_CURRENT_BINARY_DIR}/openal
++			SOURCE_DIR "${EXTERNAL_SRC_DIR}/git/openal"
+ 			BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR}/openal_static
+-			UPDATE_COMMAND ""
+-			GIT_REPOSITORY "${EXTERNAL_SRC_DIR}/git/openal"
+ 			${EXTERNAL_DEFS}
+ 			${CMAKE_EXTERNAL_DEFS}
+ 			-DALSOFT_BACKEND_DSOUND=OFF
diff --git a/pkgs/desktops/arcan/arcan/001-luajit.patch b/pkgs/desktops/arcan/arcan/001-luajit.patch
new file mode 100644
index 00000000000..eff3c0a5aad
--- /dev/null
+++ b/pkgs/desktops/arcan/arcan/001-luajit.patch
@@ -0,0 +1,17 @@
+diff -Naur source-old/src/CMakeLists.txt source-new/src/CMakeLists.txt
+--- source-old/src/CMakeLists.txt	1969-12-31 21:00:01.000000000 -0300
++++ source-new/src/CMakeLists.txt	2021-10-29 12:03:06.461399341 -0300
+@@ -419,12 +415,7 @@
+ 		set(LUA_TAG "luajit51")
+ 		if (EXISTS ${EXTERNAL_SRC_DIR}/git/luajit)
+ 			ExternalProject_Add(luajit
+-				SOURCE_DIR ${CMAKE_CURRENT_BINARY_DIR}/luajit
+-				GIT_REPOSITORY "${EXTERNAL_SRC_DIR}/git/luajit"
+-				CONFIGURE_COMMAND ""
+-				GIT_TAG "v2.1.0-beta3"
+-				UPDATE_COMMAND ""
+-				INSTALL_COMMAND ""
++				SOURCE_DIR "${EXTERNAL_SRC_DIR}/git/luajit"
+ 				BUILD_IN_SOURCE 1
+ 				BUILD_COMMAND "${EXTMAKE_CMD}"
+ 				DEFAULT_CC=${CMAKE_C_COMPILER}
diff --git a/pkgs/desktops/arcan/arcan/002-libuvc.patch b/pkgs/desktops/arcan/arcan/002-libuvc.patch
new file mode 100644
index 00000000000..48d25fe8271
--- /dev/null
+++ b/pkgs/desktops/arcan/arcan/002-libuvc.patch
@@ -0,0 +1,15 @@
+diff -Naur source-old/src/frameserver/decode/default/CMakeLists.txt source-new/src/frameserver/decode/default/CMakeLists.txt
+--- source-old/src/frameserver/decode/default/CMakeLists.txt	1969-12-31 21:00:01.000000000 -0300
++++ source-new/src/frameserver/decode/default/CMakeLists.txt	2021-10-29 12:01:31.989933725 -0300
+@@ -62,10 +62,8 @@
+ 		if (STATIC_LIBUVC)
+ 			pkg_check_modules(LIBUSB_1 REQUIRED libusb-1.0)
+ 			ExternalProject_Add(libuvc
+-				SOURCE_DIR "${CMAKE_CURRENT_BINARY_DIR}/frameserver/decode/libuvc"
++				SOURCE_DIR "${EXTERNAL_SRC_DIR}/git/libuvc"
+ 				BINARY_DIR "${CMAKE_CURRENT_BINARY_DIR}/libuvc_static"
+-				UPDATE_COMMAND ""
+-				GIT_REPOSITORY "${EXTERNAL_SRC_DIR}/git/libuvc"
+ 				${EXTERNAL_DEFS}
+ 				${CMAKE_EXTERNAL_DEFS}
+ 				-DBUILD_UVC_STATIC=ON
diff --git a/pkgs/desktops/arcan/arcan/003-freetype.patch b/pkgs/desktops/arcan/arcan/003-freetype.patch
new file mode 100644
index 00000000000..e38d329b026
--- /dev/null
+++ b/pkgs/desktops/arcan/arcan/003-freetype.patch
@@ -0,0 +1,14 @@
+diff -Naur source-old/src/CMakeLists.txt source-new/src/CMakeLists.txt
+--- source-old/src/CMakeLists.txt	1969-12-31 21:00:01.000000000 -0300
++++ source-new/src/CMakeLists.txt	2021-10-29 12:03:06.461399341 -0300
+@@ -317,9 +317,7 @@
+ 		find_package(BZip2 REQUIRED QUIET)
+ 		pkg_check_modules(HARFBUZZ REQUIRED QUIET harfbuzz)
+ 		ExternalProject_Add(Freetype
+-			SOURCE_DIR "${CMAKE_CURRENT_BINARY_DIR}/freetype"
+-			UPDATE_COMMAND ""
+-			GIT_REPOSITORY "${EXTERNAL_SRC_DIR}/git/freetype"
++			SOURCE_DIR "${EXTERNAL_SRC_DIR}/git/freetype"
+ 			${EXTERNAL_DEFS}
+ 			${CMAKE_EXTERNAL_DEFS}
+ 			-DWITH_ZLIB=OFF
diff --git a/pkgs/desktops/arcan/arcan/clone-sources.nix b/pkgs/desktops/arcan/arcan/clone-sources.nix
new file mode 100644
index 00000000000..2ade63e70bf
--- /dev/null
+++ b/pkgs/desktops/arcan/arcan/clone-sources.nix
@@ -0,0 +1,25 @@
+{ fetchgit, fetchFromGitHub }:
+{
+  letoram-openal-src = fetchFromGitHub {
+    owner = "letoram";
+    repo = "openal";
+    rev = "1c7302c580964fee9ee9e1d89ff56d24f934bdef";
+    hash = "sha256-InqU59J0zvwJ20a7KU54xTM7d76VoOlFbtj7KbFlnTU=";
+  };
+  freetype-src = fetchgit {
+    url = "git://git.sv.nongnu.org/freetype/freetype2.git";
+    rev = "94cb3a2eb96b3f17a1a3bd0e6f7da97c0e1d8f57";
+    sha256 = "sha256-LzjqunX/T8khF2UjPlPYiQOwMGem8MqPYneR2LdZ5Fg=";
+  };
+  libuvc-src = fetchgit {
+    owner = "libuvc";
+    repo = "libuvc";
+    rev = "b2b01ae6a2875d05c99eb256bb15815018d6e837";
+    sha256 = "sha256-2zCTjyodRARkHM/Q0r4bdEH9LO1Z9xPCnY2xE4KZddA=";
+  };
+  luajit-src = fetchgit {
+    url = "https://luajit.org/git/luajit-2.0.git";
+    rev = "d3294fa63b344173db68dd612c6d3801631e28d4";
+    sha256 = "sha256-1iHBXcbYhWN4M8g5oH09S1j1WrjYzI6qcRbHsdfpRkk=";
+  };
+}
diff --git a/pkgs/desktops/arcan/arcan/default.nix b/pkgs/desktops/arcan/arcan/default.nix
index 48d4f9a5481..8420df5e7e2 100644
--- a/pkgs/desktops/arcan/arcan/default.nix
+++ b/pkgs/desktops/arcan/arcan/default.nix
@@ -1,6 +1,7 @@
 { lib
 , stdenv
 , fetchFromGitHub
+, fetchgit
 , SDL2
 , cmake
 , espeak
@@ -23,6 +24,7 @@
 , libvncserver
 , libxcb
 , libxkbcommon
+, lua
 , luajit
 , makeWrapper
 , mesa
@@ -36,22 +38,16 @@
 , xcbutil
 , xcbutilwm
 , xz
-, buildManpages ? true, ruby
+, buildManPages ? true, ruby
+, useBuiltinLua ? true
+, useStaticFreetype ? false
+, useStaticLibuvc ? false
+, useStaticOpenAL ? true
+, useStaticSqlite ? false
 }:
 
-let
-  # TODO: investigate vendoring, especially OpenAL
-  # WARN: vendoring of OpenAL is required for running arcan_lwa
-  # INFO: maybe it needs leaveDotGit, but it is dangerous/impure
-  letoram-openal-src = fetchFromGitHub {
-    owner = "letoram";
-    repo = "openal";
-    rev = "1c7302c580964fee9ee9e1d89ff56d24f934bdef";
-    hash = "sha256-InqU59J0zvwJ20a7KU54xTM7d76VoOlFbtj7KbFlnTU=";
-  };
-in
 stdenv.mkDerivation rec {
-  pname = "arcan";
+  pname = "arcan" + lib.optionalString useStaticOpenAL "-static-openal";
   version = "0.6.1pre1+unstable=2021-10-16";
 
   src = fetchFromGitHub {
@@ -61,28 +57,11 @@ stdenv.mkDerivation rec {
     hash = "sha256-4FodFuO51ehvyjH4YaF/xBY9dwA6cP/e6/BvEsH4w7U=";
   };
 
-  postUnpack = ''
-    pushd .
-    cd $sourceRoot/external/git/
-    cp -a ${letoram-openal-src}/ openal/
-    chmod --recursive 744 openal/
-    popd
-  '';
-
-  # TODO: work with upstream in order to get rid of these hardcoded paths
-  postPatch = ''
-    substituteInPlace ./src/platform/posix/paths.c \
-      --replace "/usr/bin" "$out/bin" \
-      --replace "/usr/share" "$out/share"
-
-    substituteInPlace ./src/CMakeLists.txt --replace "SETUID" "# SETUID"
-  '';
-
   nativeBuildInputs = [
     cmake
     makeWrapper
     pkg-config
-  ] ++ lib.optionals buildManpages [
+  ] ++ lib.optionals buildManPages [
     ruby
   ];
 
@@ -108,6 +87,7 @@ stdenv.mkDerivation rec {
     libvncserver
     libxcb
     libxkbcommon
+    lua
     luajit
     mesa
     openal
@@ -121,11 +101,54 @@ stdenv.mkDerivation rec {
     xz
   ];
 
+  patches = [
+    # Nixpkgs-specific: redirect vendoring
+    ./000-openal.patch
+    ./001-luajit.patch
+    ./002-libuvc.patch
+    ./003-freetype.patch
+  ];
+
+  # Emulate external/git/clone.sh
+  postUnpack = let
+    inherit (import ./clone-sources.nix { inherit fetchFromGitHub fetchgit; })
+      letoram-openal-src freetype-src libuvc-src luajit-src;
+  in
+    ''
+      pushd $sourceRoot/external/git/
+    ''
+    + (lib.optionalString useStaticOpenAL ''
+      cp -a ${letoram-openal-src}/ openal
+      chmod --recursive 744 openal
+    '')
+    + (lib.optionalString useStaticFreetype ''
+      cp -a ${freetype-src}/ freetype
+      chmod --recursive 744 freetype
+    '')
+    + (lib.optionalString useStaticLibuvc ''
+      cp -a ${libuvc-src}/ libuvc
+      chmod --recursive 744 libuvc
+    '')
+    + (lib.optionalString useBuiltinLua ''
+      cp -a ${luajit-src}/ luajit
+      chmod --recursive 744 luajit
+    '') +
+    ''
+      popd
+    '';
+
+  postPatch = ''
+    substituteInPlace ./src/platform/posix/paths.c \
+      --replace "/usr/bin" "$out/bin" \
+      --replace "/usr/share" "$out/share"
+
+    substituteInPlace ./src/CMakeLists.txt --replace "SETUID" "# SETUID"
+  '';
+
   # INFO: According to the source code, the manpages need to be generated before
   # the configure phase
-  preConfigure = lib.optionalString buildManpages ''
-    pushd .
-    cd doc
+  preConfigure = lib.optionalString buildManPages ''
+    pushd doc
     ruby docgen.rb mangen
     popd
   '';
@@ -136,7 +159,12 @@ stdenv.mkDerivation rec {
     "-DDISTR_TAG=Nixpkgs"
     "-DENGINE_BUILDTAG=${version}"
     "-DHYBRID_SDL=on"
-    "-DSTATIC_OPENAL=off"
+    "-DBUILTIN_LUA=${if useBuiltinLua then "on" else "off"}"
+    "-DDISABLE_JIT=${if useBuiltinLua then "on" else "off"}"
+    "-DSTATIC_FREETYPE=${if useStaticFreetype then "on" else "off"}"
+    "-DSTATIC_LIBUVC=${if useStaticLibuvc then "on" else "off"}"
+    "-DSTATIC_OPENAL=${if useStaticOpenAL then "on" else "off"}"
+    "-DSTATIC_SQLite3=${if useStaticSqlite then "on" else "off"}"
     "../src"
   ];