Issue 806: Remove hard coded NVIM_QT_RUNTIME_PATH

Hard coding the compile-time install path is sub-optimal.

This can cause issues when the intended install location is changed. For
example the program is compiled on Windows with D:\Program Files. The
users installs to C:\Program Files.

This can impact Linux too, but is less likely: extract package image to /opt.

This has already been removed for MacOS. Removing for Linux/Windows
allows us to use the same code for all platforms.

src/gui/CMakeLists.txt

@@ -4,7 +4,6 @@ include_directories(.. shellwidget)
 qt5_add_resources(NEOVIM_RCC_SOURCES data.qrc)
 if(WIN32)
 	set(SRCS_PLATFORM
-		app_runtime.cpp
 		arguments_qwindowgeometry.cpp
 		input_win32.cpp
 		printinfo_msgbox.cpp
@@ -18,7 +17,6 @@ if(WIN32)
 	enable_language(RC)
 elseif(APPLE)
 	set(SRCS_PLATFORM
-		app_runtime_mac.cpp
 		arguments_qwindowgeometry.cpp
 		input_mac.cpp
 		printinfo_stdout.cpp
@@ -29,7 +27,6 @@ elseif(APPLE)
 	set(MACOSX_BUNDLE_INFO_PLIST ${PROJECT_SOURCE_DIR}/cmake/MacOSXBundleInfo.plist.in)
 else()
 	set(SRCS_PLATFORM
-		app_runtime.cpp
 		arguments_geometry.cpp
 		input_unix.cpp
 		printinfo_stdout.cpp
@@ -55,9 +52,12 @@ add_library(neovim-qt-gui
 	${NEOVIM_RCC_SOURCES})
 target_link_libraries(neovim-qt-gui ${QTLIBS} qshellwidget neovim-qt)
 
-if(NOT APPLE)
-	set_property(SOURCE app_runtime.cpp PROPERTY COMPILE_DEFINITIONS
-		NVIM_QT_RUNTIME_PATH="${CMAKE_INSTALL_FULL_DATADIR}/nvim-qt/runtime")
+if(APPLE)
+	set_property(SOURCE app.cpp PROPERTY COMPILE_DEFINITIONS
+		NVIM_QT_RELATIVE_RUNTIME_PATH="../Resources/runtime")
+else()
+	set_property(SOURCE app.cpp PROPERTY COMPILE_DEFINITIONS
+		NVIM_QT_RELATIVE_RUNTIME_PATH="../share/nvim-qt/runtime")
 endif()
 
 add_executable(nvim-qt WIN32 MACOSX_BUNDLE main.cpp

src/gui/app.cpp

@@ -254,7 +254,24 @@ void App::setupRequestTimeout() noexcept
 	m_connector->setRequestTimeout(m_parser.value("timeout").toInt());
 }
 
-QStringList App::getNeovimArgs() noexcept
+/*static*/ QString App::getRuntimePath() noexcept
+{
+	QString path{ QString::fromLocal8Bit(qgetenv("NVIM_QT_RUNTIME_PATH")) };
+
+	if (QFileInfo(path).isDir()) {
+		return path;
+	}
+
+	// Look for the runtime relative to the nvim-qt binary
+	const QDir d{ QDir{ applicationDirPath() }.filePath(NVIM_QT_RELATIVE_RUNTIME_PATH) };
+	if (d.exists()) {
+		return d.path();
+	}
+
+	return {};
+}
+
+/*static*/ QStringList App::getNeovimArgs() noexcept
 {
 	QStringList neovimArgs{ "--cmd","set termguicolors" };