From c8f4e524ba30f6148c6da83d0f23dd0f3fc68125 Mon Sep 17 00:00:00 2001
From: WarmUpTill <19472752+WarmUpTill@users.noreply.github.com>
Date: Fri, 25 Sep 2026 21:00:47 +0200
Subject: [PATCH] Make deps/exprtk dependency optional

---
 CMakeLists.txt             | 14 ++++++++++++--
 lib/utils/math-helpers.cpp |  4 ++++
 tests/CMakeLists.txt       |  7 +++++--
 3 files changed, 21 insertions(+), 4 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index df1e47c3..09c6086a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -383,8 +383,18 @@ target_precompile_headers(${LIB_NAME} PRIVATE
                           "${CMAKE_CURRENT_SOURCE_DIR}/lib/pch.hpp")
 
 target_include_directories(
-  ${LIB_NAME} PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/deps/obs-websocket/lib"
-                     "${CMAKE_CURRENT_SOURCE_DIR}/deps/exprtk")
+  ${LIB_NAME} PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/deps/obs-websocket/lib")
+
+if(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/deps/exprtk/exprtk.hpp")
+  target_include_directories(${LIB_NAME}
+                             PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/deps/exprtk")
+  target_compile_definitions(${LIB_NAME} PRIVATE EXPRTK_SUPPORT=1)
+else()
+  message(
+    STATUS
+      "${PROJECT_NAME}: deps/exprtk not found - math expression support disabled"
+  )
+endif()
 
 if(NOT nlohmann_json_DIR
    AND EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/deps/json/CMakeLists.txt")
diff --git a/lib/utils/math-helpers.cpp b/lib/utils/math-helpers.cpp
index fc014343..64d15268 100644
--- a/lib/utils/math-helpers.cpp
+++ b/lib/utils/math-helpers.cpp
@@ -2,13 +2,16 @@
 #include "obs-module-helper.hpp"
 
 #include <climits>
+#ifdef EXPRTK_SUPPORT
 #include <exprtk.hpp>
 #include <random>
+#endif
 
 namespace advss {
 
 std::variant<double, std::string> EvalMathExpression(const std::string &expr)
 {
+#ifdef EXPRTK_SUPPORT
 	static auto randomFunc = []() {
 		thread_local std::mt19937 gen(std::random_device{}());
 		thread_local std::uniform_real_distribution<double> dis(0.0,
@@ -26,6 +29,7 @@ std::variant<double, std::string> EvalMathExpression(const std::string &expr)
 	if (parser.compile(expr, expression)) {
 		return expression.value();
 	}
+#endif
 	return std::string(obs_module_text(
 		       "AdvSceneSwitcher.math.expressionFail")) +
 	       " \"" + expr + "\"";
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 97165712..e3d2fdcb 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -85,8 +85,11 @@ target_sources(
   ${PROJECT_NAME}
   PRIVATE test-math.cpp ${ADVSS_SOURCE_DIR}/lib/utils/math-helpers.cpp
           ${ADVSS_SOURCE_DIR}/lib/utils/obs-module-helper.cpp)
-target_include_directories(${PROJECT_NAME}
-                           PRIVATE ${ADVSS_SOURCE_DIR}/deps/exprtk)
+if(EXISTS "${ADVSS_SOURCE_DIR}/deps/exprtk/exprtk.hpp")
+  target_include_directories(${PROJECT_NAME}
+                             PRIVATE ${ADVSS_SOURCE_DIR}/deps/exprtk)
+  target_compile_definitions(${PROJECT_NAME} PRIVATE EXPRTK_SUPPORT=1)
+endif()
 
 if(MSVC)
   target_compile_options(${PROJECT_NAME} PUBLIC /MP /d2FH4- /wd4267 /bigobj)