Add versioning to logiops binaries

CMakeLists.txt

@@ -11,4 +11,41 @@ set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -O0 -Wall -Wextra")
 set(CMAKE_CXX_STANDARD 14)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
+find_package(Git)
+
+# Set version number
+if(EXISTS ${CMAKE_SOURCE_DIR}/version.txt)
+    file(READ version.txt LOGIOPS_VERSION)
+    string(REGEX REPLACE "\n$" "" LOGIOPS_VERSION ${LOGIOPS_VERSION})
+endif()
+
+if(GIT_FOUND AND EXISTS ${CMAKE_SOURCE_DIR}/.git)
+    execute_process(COMMAND ${GIT_EXECUTABLE}
+            rev-parse --abbrev-ref HEAD
+            OUTPUT_VARIABLE LOGIOPS_GIT_BRANCH)
+    string(REGEX REPLACE "\n$" "" LOGIOPS_GIT_BRANCH ${LOGIOPS_GIT_BRANCH})
+    if(LOGIOPS_GIT_BRANCH MATCHES "^tags/?")
+        STRING(REGEX REPLACE "^tags/" ""
+                LOGIOPS_VERSION ${LOGIOPS_GIT_BRANCH})
+    else()
+        execute_process(COMMAND ${GIT_EXECUTABLE}
+                rev-parse --short HEAD
+                OUTPUT_VARIABLE LOGIOPS_COMMIT_HASH)
+        string(REGEX REPLACE "\n$" "" LOGIOPS_COMMIT_HASH ${LOGIOPS_COMMIT_HASH})
+        if(LOGIOPS_VERSION)
+            string(APPEND LOGIOPS_VERSION -${LOGIOPS_COMMIT_HASH})
+        else()
+            set(LOGIOPS_VERSION git-${LOGIOPS_COMMIT_HASH})
+        endif()
+    endif()
+endif()
+
+if(LOGIOPS_VERSION)
+    message("LogiOps Version Number: ${LOGIOPS_VERSION}")
+else()
+    set(LOGIOPS_VERSION "null")
+endif()
+
+add_definitions( -DLOGIOPS_VERSION="${LOGIOPS_VERSION}")
+
 add_subdirectory(src/logid)

src/logid/logid.cpp

@@ -19,6 +19,11 @@
 #define evdev_name "logid"
 #define DEFAULT_CONFIG_FILE "/etc/logid.cfg"
 
+#ifndef LOGIOPS_VERSION
+#define LOGIOPS_VERSION "null"
+#warning Version is undefined!
+#endif
+
 using namespace logid;
 
 LogLevel logid::global_verbosity = INFO;
@@ -31,7 +36,8 @@ enum class Option
     None,
     Verbose,
     Config,
-    Help
+    Help,
+    Version
 };
 
 int main(int argc, char** argv)
@@ -51,11 +57,15 @@ int main(int argc, char** argv)
                     if (op_str == "--verbose") option = Option::Verbose;
                     if (op_str == "--config") option = Option::Config;
                     if (op_str == "--help") option = Option::Help;
+                    if (op_str == "--version") option = Option::Version;
                     break;
                 }
                 case 'v': // Verbosity
                     option = Option::Verbose;
                     break;
+                case 'V': //Version
+                    option = Option::Version;
+                    break;
                 case 'c': // Config file path
                     option = Option::Config;
                     break;
@@ -103,14 +113,23 @@ int main(int argc, char** argv)
                     break;
                 }
                 case Option::Help:
-                    printf(R"(Usage: %s [options]
+                {
+                    printf(R"(logid version %s
+Usage: %s [options]
 Possible options are:
     -v,--verbose [level]       Set log level to debug/info/warn/error (leave blank for debug)
+    -V,--version               Print version number
     -c,--config [file path]    Change config file from default at %s
     -h,--help                  Print this message.
-)", argv[0], DEFAULT_CONFIG_FILE);
+)", LOGIOPS_VERSION, argv[0], DEFAULT_CONFIG_FILE);
 
                     return EXIT_SUCCESS;
+                }
+                case Option::Version:
+                {
+                    printf("%s\n", LOGIOPS_VERSION);
+                    return EXIT_SUCCESS;
+                }
                 case Option::None:
                     break;
             }