CMake: Add Graphviz version information

Adds version numbers to the main CMakeLists.txt. The build version is set
to the date and time of the most recent commit, similar to the Autotools
build.

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4ce651d048db189751980ac74ef6da72c0bc234e..1ee91e3fe1701cc21ab7dc8ae81e295163350d42 100644 (file)
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,31 @@
 cmake_minimum_required (VERSION 2.8 FATAL_ERROR)
 
+# Build dependencies
+# ==================
+find_package(Git REQUIRED)
+
+# General project information
+# ===========================
 project (Graphviz)
 
+set(GRAPHVIZ_VERSION_MAJROR 2)
+set(GRAPHVIZ_VERSION_MINOR 39)
+
+# Set GRAPHVIZ_VERSION_BUILD to time of last commit, or to 0 if that fails.
+execute_process(
+    COMMAND           "${GIT_EXECUTABLE}" log -n 1 --format=%cd --date=format:%Y%m%d.%H%M
+    WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
+    RESULT_VARIABLE   git_result
+    OUTPUT_VARIABLE   GRAPHVIZ_VERSION_BUILD
+    ERROR_VARIABLE    git_error
+    OUTPUT_STRIP_TRAILING_WHITESPACE
+    ERROR_STRIP_TRAILING_WHITESPACE
+)
+if(NOT git_result EQUAL 0)
+    message(WARNING "Failed to set build version: ${git_error}")
+    set(GRAPHVIZ_VERSION_BUILD 0)
+endif()
+
+message(STATUS "Graphviz version: ${GRAPHVIZ_VERSION_MAJROR}.${GRAPHVIZ_VERSION_MINOR}.${GRAPHVIZ_VERSION_BUILD}")
+
 add_subdirectory(lib)