Show project version and repo URL in usage, bump version to 1.0.1

CMakeLists.txt

@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
 
-project(respawn VERSION 0.1.0)
+project(respawn VERSION 1.0.1)
 
 add_subdirectory(external/argh EXCLUDE_FROM_ALL)
 add_subdirectory(external/sioku EXCLUDE_FROM_ALL)
@@ -21,6 +21,8 @@ add_executable(respawn
   src/repl.cpp
   src/usb/client.cpp)
 target_compile_features(respawn PRIVATE cxx_std_17)
+target_compile_definitions(respawn PRIVATE
+  CMAKE_PROJECT_VERSION="${CMAKE_PROJECT_VERSION}")
 target_include_directories(respawn PRIVATE include)
 target_link_libraries(respawn PRIVATE 
   argh

src/main.cpp

@@ -15,7 +15,12 @@
 
 #include <iostream>
 
-constexpr auto USAGE = R"(Usage: respawn [-spIrvVh]
+#ifndef CMAKE_PROJECT_VERSION
+#define CMAKE_PROJECT_VERSION "?.?.?"
+#endif
+
+constexpr auto USAGE = R"(
+Usage: respawn [-spIrvVh]
 
 Options:
   -s, --serial          Only print the device's serial, then exit
@@ -60,6 +65,8 @@ static Chip parse_cpid(const std::string &serial) {
 int main(int argc, char const **argv) {
   argh::parser args(argc, argv, argh::parser::SINGLE_DASH_IS_MULTIFLAG);
   if (args[{"-h", "--help"}]) {
+    std::cout << "Respawn " CMAKE_PROJECT_VERSION
+              << " <https://github.com/jonpalmisc/respawn>\n";
     std::cout << USAGE;
     return 0;
   }