From 7e14d05f719767f6af364e0f4b955fd49ead8a9f Mon Sep 17 00:00:00 2001
From: ShinDarth <borzifrancesco@gmail.com>
Date: Tue, 9 Aug 2016 16:09:37 +0200
Subject: [PATCH] CMake: fixed git informations

---
 CMakeLists.txt         |  6 +--
 src/cmake/genrev.cmake | 86 +++++++++++++++++++++++++++++++-----------
 2 files changed, 67 insertions(+), 25 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index e0be32872..ab00e8eed 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -73,9 +73,9 @@ if( UNIX )
   find_package(BZip2)
 endif()
 
-#if(NOT WITHOUT_GIT)
-#  find_package(Git)
-#endif()
+if(NOT WITHOUT_GIT)
+  find_package(Git)
+endif()
 
 # Find revision ID and hash of the sourcetree
 include(src/cmake/genrev.cmake)
diff --git a/src/cmake/genrev.cmake b/src/cmake/genrev.cmake
index 23a72aa27..edd31590a 100644
--- a/src/cmake/genrev.cmake
+++ b/src/cmake/genrev.cmake
@@ -1,4 +1,4 @@
-# Copyright (C)
+# Copyright (C) TrinityCore, AzerothCore
 #
 # This file is free software; as a special exception the author gives
 # unlimited permission to copy and/or distribute it, with or without
@@ -8,34 +8,76 @@
 # WITHOUT ANY WARRANTY, to the extent permitted by law; without even the
 # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 
-include(${CMAKE_SOURCE_DIR}/src/cmake/macros/EnsureVersion.cmake)
+# User has manually chosen to ignore the git-tests, so throw them a warning.
+# This is done EACH compile so they can be alerted about the consequences.
 
-set(_REQUIRED_GIT_VERSION "1.7")
-
-# Its not set during initial run
 if(NOT BUILDDIR)
+  # Workaround for funny MSVC behaviour - this segment is only used when using cmake gui
   set(BUILDDIR ${CMAKE_BINARY_DIR})
 endif()
 
-FIND_PROGRAM(SVN_EXECUTABLE svn DOC "subversion command line client")
+if(WITHOUT_GIT)
+  set(rev_date "1970-01-01 00:00:00 +0000")
+  set(rev_hash "unknown")
+  set(rev_branch "Archived")
+else()
+  # Workaround for not correctly detecting git
+  if (NOT GIT_EXECUTABLE)
+    set(GIT_EXECUTABLE "git")
+  endif()
 
-# only do this if we have an svn client.
-if (SVN_EXECUTABLE)
-    MACRO(Subversion_GET_REVISION dir variable)
-      EXECUTE_PROCESS(COMMAND ${SVN_EXECUTABLE} info ${dir}
-        OUTPUT_VARIABLE ${variable}
-        OUTPUT_STRIP_TRAILING_WHITESPACE)
-      STRING(REGEX REPLACE "^(.*\n)?Revision: ([^\n]+).*"
-        "\\2" ${variable} "${${variable}}")
-    ENDMACRO(Subversion_GET_REVISION)
+  if(GIT_EXECUTABLE)
+    # Create a revision-string that we can use
+    execute_process(
+      COMMAND "${GIT_EXECUTABLE}" describe --long --match 0.1 --dirty=+ --abbrev=12
+      WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}"
+      OUTPUT_VARIABLE rev_info
+      OUTPUT_STRIP_TRAILING_WHITESPACE
 
-    Subversion_GET_REVISION(${CMAKE_SOURCE_DIR} REV2)
-endif ()
+    )
 
-  set(rev_hash_str ${REV2})
-  set(rev_hash ${REV2})
-  set(rev_id_str ${REV2})
-  set(rev_id ${REV2})
+    # And grab the commits timestamp
+    execute_process(
+      COMMAND "${GIT_EXECUTABLE}" show -s --format=%ci
+      WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}"
+      OUTPUT_VARIABLE rev_date
+      OUTPUT_STRIP_TRAILING_WHITESPACE
+      ERROR_QUIET
+    )
 
+    # Also retrieve branch name
+    execute_process(
+      COMMAND "${GIT_EXECUTABLE}" rev-parse --abbrev-ref HEAD
+      WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}"
+      OUTPUT_VARIABLE rev_branch
+      OUTPUT_STRIP_TRAILING_WHITESPACE
+      ERROR_QUIET
+    )
+  endif()
 
-  configure_file ( ${CMAKE_SOURCE_DIR}/revision.h.in.cmake ${BUILDDIR}/revision.h )
+  # Last minute check - ensure that we have a proper revision
+  # If everything above fails (means the user has erased the git revision control directory or removed the origin/HEAD tag)
+  if(NOT rev_info)
+    # No valid ways available to find/set the revision/hash, so let's force some defaults
+    message(STATUS "
+    Could not find a proper repository signature (hash) - you may need to pull tags with git fetch -t
+    Continuing anyway - note that the versionstring will be set to \"unknown 1970-01-01 00:00:00 (Archived)\"")
+    set(rev_date "1970-01-01 00:00:00 +0000")
+    set(rev_hash "unknown")
+    set(rev_branch "Archived")
+  else()
+    # Extract information required to build a proper versionstring
+    string(REGEX REPLACE 0.1-|[0-9]+-g "" rev_hash ${rev_info})
+  endif()
+endif()
+
+# Create the actual revision.h file from the above params
+if(NOT "${rev_hash_cached}" MATCHES "${rev_hash}" OR NOT "${rev_branch_cached}" MATCHES "${rev_branch}" OR NOT EXISTS "${BUILDDIR}/revision_data.h")
+  configure_file(
+    "${CMAKE_SOURCE_DIR}/revision.h.in.cmake"
+    "${BUILDDIR}/revision.h"
+    @ONLY
+  )
+  set(rev_hash_cached "${rev_hash}" CACHE INTERNAL "Cached commit-hash")
+  set(rev_branch_cached "${rev_branch}" CACHE INTERNAL "Cached branch name")
+endif()