From 84ed7759243e775778c4f2a1dae67a148543470f Mon Sep 17 00:00:00 2001
From: Matthias Maier <matthias.maier@iwr.uni-heidelberg.de>
Date: Wed, 21 Jan 2015 18:48:47 +0100
Subject: [PATCH] CMake: allow to call DEAL_II_QUERY_GIT_INFORMATION from user
 projects

This commit enables to use the DEAL_II_QUERY_GIT_INFORMATION macro from
within user projects. In this case the variable prefix "DEAL_II_" is
ommited
---
 cmake/config/CMakeLists.txt                   | 10 ++++----
 .../macro_deal_ii_query_git_information.cmake | 25 ++++++++++++++++---
 doc/news/changes.h                            |  7 ++++++
 3 files changed, 34 insertions(+), 8 deletions(-)

diff --git a/cmake/config/CMakeLists.txt b/cmake/config/CMakeLists.txt
index 621a79b799..84a7aedafd 100644
--- a/cmake/config/CMakeLists.txt
+++ b/cmake/config/CMakeLists.txt
@@ -42,16 +42,16 @@ CONFIGURE_FILE( # for binary dir:
 #                                                                      #
 ########################################################################
 
-FILE(COPY # for binary dir:
+SET(_macros
   ${CMAKE_SOURCE_DIR}/cmake/macros/macro_deal_ii_initialize_cached_variables.cmake
   ${CMAKE_SOURCE_DIR}/cmake/macros/macro_deal_ii_invoke_autopilot.cmake
   ${CMAKE_SOURCE_DIR}/cmake/macros/macro_deal_ii_setup_target.cmake
+  ${CMAKE_SOURCE_DIR}/cmake/macros/macro_deal_ii_query_git_information.cmake
+  )
+FILE(COPY ${_macros}
   DESTINATION ${CMAKE_BINARY_DIR}/${DEAL_II_CMAKE_MACROS_RELDIR}
   )
-INSTALL(FILES # for installation:
-  ${CMAKE_SOURCE_DIR}/cmake/macros/macro_deal_ii_initialize_cached_variables.cmake
-  ${CMAKE_SOURCE_DIR}/cmake/macros/macro_deal_ii_invoke_autopilot.cmake
-  ${CMAKE_SOURCE_DIR}/cmake/macros/macro_deal_ii_setup_target.cmake
+INSTALL(FILES ${_macros}
   DESTINATION ${DEAL_II_CMAKE_MACROS_RELDIR}
   COMPONENT library
   )
diff --git a/cmake/macros/macro_deal_ii_query_git_information.cmake b/cmake/macros/macro_deal_ii_query_git_information.cmake
index 6ca84c01f2..aa536b9c64 100644
--- a/cmake/macros/macro_deal_ii_query_git_information.cmake
+++ b/cmake/macros/macro_deal_ii_query_git_information.cmake
@@ -24,6 +24,13 @@
 # short and long revision. If ${CMAKE_SOURCE_DIR} is the root of a git
 # repository the following variables will be populated:
 #
+#       GIT_BRANCH
+#       GIT_REVISION
+#       GIT_SHORTREV
+#
+# If this macro is called within the deal.II build system the variables are
+# prefixed with DEAL_II_:
+#
 #       DEAL_II_GIT_BRANCH
 #       DEAL_II_GIT_REVISION
 #       DEAL_II_GIT_SHORTREV
@@ -33,6 +40,18 @@ MACRO(DEAL_II_QUERY_GIT_INFORMATION)
 
   MESSAGE(STATUS "Query git repository information.")
 
+  #
+  # If DEAL_II_BASE_NAME is defined and DEAL_II_PROJECT_CONFIG_INCLUDED was
+  # not set, we assume that we are called from within the deal.II build
+  # system. In this case we prepend all variables by "DEAL_II_"
+  #
+  IF( DEFINED DEAL_II_BASE_NAME AND
+      NOT DEFINED DEAL_II_PROJECT_CONFIG_INCLUDED )
+    SET(_prefix "DEAL_II_")
+  ELSE()
+    SET(_prefix "")
+  ENDIF()
+
   FIND_PACKAGE(Git)
 
   #
@@ -70,9 +89,9 @@ MACRO(DEAL_II_QUERY_GIT_INFORMATION)
        )
     IF(${_result} EQUAL 0)
       STRING(REGEX REPLACE "^\"([^ ]+) ([^ ]+)\"$"
-        "\\1" DEAL_II_GIT_REVISION "${_info}")
+        "\\1" ${_prefix}GIT_REVISION "${_info}")
       STRING(REGEX REPLACE "^\"([^ ]+) ([^ ]+)\"$"
-        "\\2" DEAL_II_GIT_SHORTREV "${_info}")
+        "\\2" ${_prefix}GIT_SHORTREV "${_info}")
     ENDIF()
 
     #
@@ -87,7 +106,7 @@ MACRO(DEAL_II_QUERY_GIT_INFORMATION)
        OUTPUT_STRIP_TRAILING_WHITESPACE
        )
     IF(${_result} EQUAL 0)
-      STRING(REGEX REPLACE "refs/heads/" "" DEAL_II_GIT_BRANCH "${_branch}")
+      STRING(REGEX REPLACE "refs/heads/" "" ${_prefix}GIT_BRANCH "${_branch}")
     ENDIF()
   ENDIF()
 
diff --git a/doc/news/changes.h b/doc/news/changes.h
index 47b6ba62e4..93e08ccb00 100644
--- a/doc/news/changes.h
+++ b/doc/news/changes.h
@@ -254,6 +254,13 @@ inconvenience this causes.
 <h3>Specific improvements</h3>
 
 <ol>
+  <li> New: A new macro <code>DEAL_II_QUERY_GIT_INFORMATION</code> is
+  provided to query user projects for git repository information simmilarly
+  to those exported by deal.II.
+  <br>
+  (Matthias Maier, 2015/01/21)
+  </li>
+
   <li> Fixed: FEFaceValues and FESubfaceValues did not fill the
   jacobians and inverse jacobians if requested via the update flags.
   This is now fixed.
-- 
2.39.5