From 1791063fa8644434c001b50b8543bad698ae713c Mon Sep 17 00:00:00 2001
From: Konstantin Lampalzer <konstantin.lampalzer@twinformatics.at>
Date: Mon, 23 Sep 2024 13:34:10 +0200
Subject: [PATCH] cmake: add versioning module

---
 CMakeLists.txt         | 20 +++++++++++++++++---
 cmake/Versioning.cmake | 26 ++++++++++++++++++++++++++
 2 files changed, 43 insertions(+), 3 deletions(-)
 create mode 100644 cmake/Versioning.cmake

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2d37b18..54d6ded 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,3 +1,15 @@
+#########
+# Setup #
+#########
+
+set(CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
+
+include(Versioning)
+
+########
+# Main #
+########
+
 # After installation this project can be found by 'find_package' command:
 #
 #    find_package(libcreate REQUIRED)
@@ -6,11 +18,14 @@
 #
 
 cmake_minimum_required(VERSION 3.28)
-project(libcreate)
+project(
+  libcreate 
+  VERSION ${TAG_VERSION_MAJOR}.${TAG_VERSION_MINOR}.${TAG_VERSION_PATCH}
+)
 
 add_compile_options(-Wall -Wextra -Wpedantic)
 
-set(PACKAGE_VERSION 3.0.0)
+set(PACKAGE_VERSION ${TAG_VERSION_MAJOR}.${TAG_VERSION_MINOR}.${TAG_VERSION_PATCH})
 
 option(LIBCREATE_BUILD_TESTS "Enable the build of tests." ON)
 
@@ -208,5 +223,4 @@ endif()
 # Packaging #
 #############
 
-set(CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
 include(Packing)
\ No newline at end of file
diff --git a/cmake/Versioning.cmake b/cmake/Versioning.cmake
new file mode 100644
index 0000000..b082127
--- /dev/null
+++ b/cmake/Versioning.cmake
@@ -0,0 +1,26 @@
+find_package(Git)
+
+if(GIT_EXECUTABLE)
+    execute_process(
+        COMMAND ${GIT_EXECUTABLE} describe --tags
+        OUTPUT_VARIABLE TAG_VERSION
+        RESULT_VARIABLE ERROR_CODE
+        OUTPUT_STRIP_TRAILING_WHITESPACE
+    )
+
+    if(TAG_VERSION STREQUAL "")
+        set(TAG_VERSION 0.0.0)
+        message(WARNING "Failed to determine version from Git tags. Using default version \"${TAG_VERSION}\".")
+    endif()
+
+    message(STATUS "Project version: ${TAG_VERSION}")
+
+    # Split into major, minor, patch
+    string(
+        REGEX MATCH "([0-9]+)\\.([0-9]+)\\.([0-9]+)"
+        TAG_VERSION_MATCH ${TAG_VERSION}
+    )
+    set(TAG_VERSION_MAJOR ${CMAKE_MATCH_1})
+    set(TAG_VERSION_MINOR ${CMAKE_MATCH_2})
+    set(TAG_VERSION_PATCH ${CMAKE_MATCH_3})
+endif()
\ No newline at end of file