added version injection through `cmake`

CMakeLists.txt

@@ -12,13 +12,15 @@ set(EXE_NAME "qr_${CMAKE_PROJECT_VERSION}-${ARCH}")
 
 project(
 	qr
-	VERSION 1.0.0
+	VERSION 1.0.1
 	LANGUAGES CXX
 )
 
 message(STATUS "ARCH:: ${ARCH}")
 
-file(GLOB_RECURSE sources main.cpp src/*.hpp src/*.cpp lib/*.hpp lib/*.cpp)
+configure_file(main.cpp main_substitute.cpp)
+
+file(GLOB_RECURSE sources main_substitute.cpp src/*.hpp src/*.cpp lib/*.hpp lib/*.cpp)
 add_executable(qr ${sources})
 
 set_target_properties(qr PROPERTIES OUTPUT_NAME ${EXE_NAME})

main.cpp

@@ -7,7 +7,8 @@
 
 #define UNUSED(var) (void) var;
 
-constexpr const char* VERSION = "1.0.0";
+// Version is injected through cmake
+constexpr const char* VERSION = "@qr_VERSION@";
 
 void printHelp() {
 	std::string helpText = R"EOF(
@@ -22,6 +23,9 @@ Usage:
     -o --output    output file name
     -s --size      desired output file size in pixels
     -t --type      output QR code type. can be one of "small, medium, large"
+	
+In pixel based renderers (i.e. PNG), the output size may not be exactly as
+specified but be the nearest multiple of the actual cell size for the QR code.
 	)EOF";
 	std::cout << "qr " << VERSION;
 	std::cout << helpText << std::endl;