Merge topic 'cmake-version'

fe2c558ba6 CMakeVersion: Preserve Git information during 'git archive'
0505a66cbf CMakeVersion: Add generic '-git' suffix when no git info is available
f7bf08754b CMakeVersion: Provide Git information in non-exact release versions
ac48259333 CMakeVersion: Re-order logic to obviate addition of each component
311f232f7a CMakeVersion: De-duplicate variable initialization
2f608566b4 CMakeVersion: Factor git execution into helper macro
74ff80323c CMakeVersion: Use FindGit module to find Git
e1e7986c00 CMakeVersion: Consider Git even with just a `.git` file
...

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !3622

1 files changed, 77 insertions, 0 deletions

diff --git a/Source/CMakeVersion.cmake b/Source/CMakeVersion.cmake
index 0bde5ff..63a4207 100644
--- a/Source/CMakeVersion.cmake
+++ b/Source/CMakeVersion.cmake
@@ -3,3 +3,80 @@ set(CMake_VERSION_MAJOR 3)
 set(CMake_VERSION_MINOR 15)
 set(CMake_VERSION_PATCH 20190730)
 #set(CMake_VERSION_RC 0)
+set(CMake_VERSION_IS_DIRTY 0)
+
+# Start with the full version number used in tags.  It has no dev info.
+set(CMake_VERSION
+  "${CMake_VERSION_MAJOR}.${CMake_VERSION_MINOR}.${CMake_VERSION_PATCH}")
+if(DEFINED CMake_VERSION_RC)
+  set(CMake_VERSION "${CMake_VERSION}-rc${CMake_VERSION_RC}")
+endif()
+
+# Releases define a small patch level.
+if("${CMake_VERSION_PATCH}" VERSION_LESS 20000000)
+  set(CMake_VERSION_IS_RELEASE 1)
+else()
+  set(CMake_VERSION_IS_RELEASE 0)
+endif()
+
+if(EXISTS ${CMake_SOURCE_DIR}/.git)
+  find_package(Git QUIET)
+  if(GIT_FOUND)
+    macro(_git)
+      execute_process(
+        COMMAND ${GIT_EXECUTABLE} ${ARGN}
+        WORKING_DIRECTORY ${CMake_SOURCE_DIR}
+        RESULT_VARIABLE _git_res
+        OUTPUT_VARIABLE _git_out OUTPUT_STRIP_TRAILING_WHITESPACE
+        ERROR_VARIABLE _git_err ERROR_STRIP_TRAILING_WHITESPACE
+        )
+    endmacro()
+  endif()
+endif()
+
+# Try to identify the current development source version.
+if(COMMAND _git)
+  # Get the commit checked out in this work tree.
+  _git(log -n 1 HEAD "--pretty=format:%h %s" --)
+  set(git_info "${_git_out}")
+else()
+  # Get the commit exported by 'git archive'.
+  set(git_info [==[$Format:%h %s$]==])
+endif()
+
+# Extract commit information if available.
+if(git_info MATCHES "^([0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]?[0-9a-f]?)[0-9a-f]* (.*)$")
+  # Have commit information.
+  set(git_hash "${CMAKE_MATCH_1}")
+  set(git_subject "${CMAKE_MATCH_2}")
+
+  # If this is not the exact commit of a release, add dev info.
+  if(NOT "${git_subject}" MATCHES "^[Cc][Mm]ake ${CMake_VERSION}$")
+    set(CMake_VERSION "${CMake_VERSION}-g${git_hash}")
+  endif()
+
+  # If this is a work tree, check whether it is dirty.
+  if(COMMAND _git)
+    _git(update-index -q --refresh)
+    _git(diff-index --name-only HEAD --)
+    if(_git_out)
+      set(CMake_VERSION_IS_DIRTY 1)
+    endif()
+  endif()
+else()
+  # No commit information.
+  if(NOT CMake_VERSION_IS_RELEASE)
+    # Generic development version.
+    set(CMake_VERSION "${CMake_VERSION}-git")
+  endif()
+endif()
+
+# Extract the version suffix component.
+if(CMake_VERSION MATCHES "-(.*)$")
+  set(CMake_VERSION_SUFFIX "${CMAKE_MATCH_1}")
+else()
+  set(CMake_VERSION_SUFFIX "")
+endif()
+if(CMake_VERSION_IS_DIRTY)
+  set(CMake_VERSION ${CMake_VERSION}-dirty)
+endif()