Refactor CMake version handling

Move the CMake version number components out of "CMakeLists.txt" into
dedicated file "Source/CMakeVersion.cmake".  Set the TWEAK level to the
date explicitly.  Add a "Source/CMakeVersion.bash" script to update the
date, thus replacing KWSys DateStamp for CMake.  Teach the bootstrap
script to extract the version components from their new location.

CMakeLists.txt

@@ -422,26 +422,13 @@ ENDIF()
 # The main section of the CMakeLists file
 #
 #-----------------------------------------------------------------------
-# The CMake version number.
-SET(CMake_VERSION_MAJOR 2)
-SET(CMake_VERSION_MINOR 8)
-SET(CMake_VERSION_PATCH 8)
-#SET(CMake_VERSION_TWEAK 0)
-#SET(CMake_VERSION_RC 1)
-
-# Releases define a tweak level.
-IF(DEFINED CMake_VERSION_TWEAK)
+INCLUDE(Source/CMakeVersion.cmake)
+# Releases define a small tweak level.
+IF("${CMake_VERSION_TWEAK}" VERSION_LESS 20000000)
   SET(CMake_VERSION_IS_RELEASE 1)
   SET(CMake_VERSION_SOURCE "")
 ELSE()
   SET(CMake_VERSION_IS_RELEASE 0)
-
-  # Use the date as the tweak level.
-  INCLUDE(${CMake_SOURCE_DIR}/Source/kwsys/kwsysDateStamp.cmake)
-  SET(CMake_VERSION_TWEAK
-    "${KWSYS_DATE_STAMP_YEAR}${KWSYS_DATE_STAMP_MONTH}${KWSYS_DATE_STAMP_DAY}"
-    )
-
   INCLUDE(${CMake_SOURCE_DIR}/Source/CMakeVersionSource.cmake)
 ENDIF()
 

Source/CMakeVersion.bash

@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+# Update the version component if it looks like a date or -f is given.
+if test "x$1" = "x-f"; then shift ; n='*' ; else n='\{8\}' ; fi
+if test "$#" -gt 0; then echo 1>&2 "usage: CMakeVersion.bash [-f]"; exit 1; fi
+sed -i -e '
+s/\(^SET(CMake_VERSION_TWEAK\) [0-9]'"$n"'\(.*\)/\1 '"$(date +%Y%m%d)"'\2/
+' "${BASH_SOURCE%/*}/CMakeVersion.cmake"

Source/CMakeVersion.cmake

@@ -0,0 +1,6 @@
+# CMake version number components.
+SET(CMake_VERSION_MAJOR 2)
+SET(CMake_VERSION_MINOR 8)
+SET(CMake_VERSION_PATCH 8)
+SET(CMake_VERSION_TWEAK 20120420)
+#SET(CMake_VERSION_RC 1)

bootstrap

@@ -18,18 +18,11 @@ die() {
 # Version number extraction function.
 cmake_version_component()
 {
-  cat "${cmake_source_dir}/CMakeLists.txt" | sed -n "
+  cat "${cmake_source_dir}/Source/CMakeVersion.cmake" | sed -n "
 /^SET(CMake_VERSION_${1}/ {s/SET(CMake_VERSION_${1} *\([0-9]*\))/\1/;p;}
 "
 }
 
-cmake_date_stamp_component()
-{
-  cat "${cmake_source_dir}/Source/kwsys/kwsysDateStamp.cmake" | sed -n "
-/KWSYS_DATE_STAMP_${1}/  {s/^.* \([0-9][0-9]*\))$/\1/;p;}
-"
-}
-
 cmake_toupper()
 {
     echo "$1" | sed 'y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/'
@@ -46,9 +39,6 @@ cmake_version_minor="`cmake_version_component MINOR`"
 cmake_version_patch="`cmake_version_component PATCH`"
 cmake_version="${cmake_version_major}.${cmake_version_minor}.${cmake_version_patch}"
 cmake_version_tweak="`cmake_version_component TWEAK`"
-if [ "x$cmake_version_tweak" = "x" ]; then
-  cmake_version_tweak="`cmake_date_stamp_component YEAR``cmake_date_stamp_component MONTH``cmake_date_stamp_component DAY`"
-fi
 if [ "$cmake_version_tweak" != "0" ]; then
   cmake_version="${cmake_version}.${cmake_version_tweak}"
 fi