Generating version.h in cmake

.gitignore

@@ -1,2 +1,3 @@
 /_*
+/src/_version.h
 /CMakeLists.txt.user

CMakeLists.txt

@@ -1,6 +1,16 @@
 cmake_minimum_required(VERSION 3.0.0)
 project(keymapper LANGUAGES CXX)
 
+set(GIT_COMMIT_LAST_TAG "unknown")
+find_package(Git)
+if(GIT_FOUND)
+    execute_process(COMMAND ${GIT_EXECUTABLE} describe --tags
+                  WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+                  OUTPUT_VARIABLE GIT_COMMIT_LAST_TAG
+                  OUTPUT_STRIP_TRAILING_WHITESPACE)
+endif()
+configure_file("src/version.h.in" "${CMAKE_SOURCE_DIR}/src/_version.h")
+
 set(CMAKE_CXX_STANDARD 17)
 
 include_directories(src)
@@ -53,6 +63,8 @@ if(NOT WIN32)
     src/linux/server/main.cpp
     src/linux/server/uinput_keyboard.cpp
     src/linux/server/uinput_keyboard.h
+    src/linux/server/Settings.cpp
+    src/linux/server/Settings.h
   )
   target_link_libraries(keymapperd usb-1.0 udev)
 

src/linux/client/Settings.cpp

@@ -13,6 +13,9 @@ bool interpret_commandline(Settings& settings, int argc, char* argv[]) {
         return false;
       settings.config_file_path = argv[i];
     }
+    if (argument == "-v" || argument == "--verbose") {
+      settings.verbose = true;
+    }
     else {
       return false;
     }
@@ -41,6 +44,7 @@ void print_help_message(const char* argv0) {
     "Usage: %s [-options]\n"
     "  -c, --config <path>  configuration file.\n"
     "  -u, --update         reload configuration file when it changes.\n"
+    "  -v, --verbose        enable verbose output.\n"
     "\n"
     "All Rights Reserved.\n"
     "This program comes with absolutely no warranty.\n"

src/linux/client/Settings.h

@@ -5,6 +5,7 @@
 struct Settings {
   std::string config_file_path;
   bool auto_update_config;
+  bool verbose;
 };
 
 bool interpret_commandline(Settings& settings, int argc, char* argv[]);

src/linux/server/Settings.cpp

@@ -0,0 +1,43 @@
+
+#include "Settings.h"
+#include <cstdio>
+
+bool interpret_commandline(Settings& settings, int argc, char* argv[]) {
+  for (auto i = 1; i < argc; i++) {
+    const auto argument = std::string(argv[i]);
+    if (argument == "-v" || argument == "--verbose") {
+      settings.verbose = true;
+    }
+    else {
+      return false;
+    }
+  }
+  return true;
+}
+
+void print_help_message(const char* argv0) {
+  auto program = std::string(argv0);
+  if (auto i = program.rfind('/'); i != std::string::npos)
+    program = program.substr(i + 1);
+  if (auto i = program.rfind('.'); i != std::string::npos)
+    program = program.substr(0, i);
+
+  const auto version =
+#if __has_include("../../_version.h")
+# include "../../_version.h"
+  " ";
+#else
+  "";
+#endif
+
+  std::printf(
+    "keymapperd %s(c) 2019-2021 by Albert Kalchmair\n"
+    "\n"
+    "Usage: %s [-options]\n"
+    "  -v, --verbose        enable verbose output.\n"
+    "\n"
+    "All Rights Reserved.\n"
+    "This program comes with absolutely no warranty.\n"
+    "See the GNU General Public License, version 3 for details.\n"
+    "\n", version, program.c_str());
+}

src/linux/server/Settings.h

@@ -0,0 +1,10 @@
+#pragma once
+
+#include <string>
+
+struct Settings {
+  bool verbose;
+};
+
+bool interpret_commandline(Settings& settings, int argc, char* argv[]);
+void print_help_message(const char* arg0);

src/linux/server/main.cpp

@@ -2,6 +2,7 @@
 #include "ipc.h"
 #include "GrabbedKeyboards.h"
 #include "uinput_keyboard.h"
+#include "Settings.h"
 #include "runtime/Stage.h"
 #include <linux/uinput.h>
 
@@ -10,7 +11,14 @@ namespace {
   const auto uinput_keyboard_name = "Keymapper";
 }
 
-int main() {
+int main(int argc, char* argv[]) {
+  auto settings = Settings{ };
+
+  if (!interpret_commandline(settings, argc, argv)) {
+    print_help_message(argv[0]);
+    return 1;
+  }
+
   // wait for client connection loop
   for (;;) {
     const auto ipc_fd = initialize_ipc(ipc_fifo_filename);

src/version.h.in

@@ -0,0 +1 @@
+"${GIT_COMMIT_LAST_TAG}"

src/win32/Settings.cpp

@@ -25,9 +25,14 @@ bool interpret_commandline(Settings& settings, int argc, wchar_t* argv[]) {
 
 void print_help_message(const wchar_t* argv0) {
   const auto version = std::string(
-#include "../_version.h"
-  );
-  print(("keymapper " + version + " (c) 2019-2021 by Albert Kalchmair\n"
+#if __has_include("../_version.h")
+# include "../_version.h"
+  " ");
+#else
+  "");
+#endif
+
+  print(("keymapper " + version + "(c) 2019-2021 by Albert Kalchmair\n"
     "\n"
     "Usage: keymapper [-options]\n"
     "  -c, --config <path>  configuration file.\n"

src/win32/main.cpp

@@ -103,19 +103,19 @@ void reuse_buffer(KeySequence&& buffer) {
 }
 
 int WINAPI wWinMain(HINSTANCE instance, HINSTANCE, LPWSTR, int) {
-  LimitSingleInstance single_instance("Global\\{658914E7-CCA6-4425-89FF-EF4A13B75F31}");
-  if (single_instance.is_another_instance_running())
-    return 1;
-
-  SetPriorityClass(GetCurrentProcess(), HIGH_PRIORITY_CLASS);
-
   g_settings.config_file_path = config_filename;
 
   if (!interpret_commandline(g_settings, __argc, __wargv)) {
     print_help_message(__wargv[0]);
     return 1;
   }
 
+  LimitSingleInstance single_instance("Global\\{658914E7-CCA6-4425-89FF-EF4A13B75F31}");
+  if (single_instance.is_another_instance_running())
+    return 1;
+
+  SetPriorityClass(GetCurrentProcess(), HIGH_PRIORITY_CLASS);
+
   // load initial configuration
   g_config_file = ConfigFile(g_settings.config_file_path);
   if (!g_config_file.update())