Added retrieval of ISIS version in Autotools

This will hopefully be a reliable way to extract ISIS version.

configure.ac

@@ -316,6 +316,9 @@ else
 fi
 
 AX_PKG(ISIS, [ISIS3RDPARTY QT], [-lisis3], [SpecialPixel.h])
+if test x"$HAVE_PKG_ISIS" = "xyes"; then
+  AX_PKG_ISIS_CHECK_VERSION()
+fi
 
 dnl check for recent rabbitmq; this can go away soon, it's just to prevent a
 dnl flag-day upgrade

m4/ax_pkg_isis_check_version.m4

@@ -0,0 +1,43 @@
+dnl __BEGIN_LICENSE__
+dnl Copyright (C) 2006-2011 United States Government as represented by
+dnl the Administrator of the National Aeronautics and Space Administration.
+dnl All Rights Reserved.
+dnl __END_LICENSE__
+
+# Usage AX_PKG_ISIS_CHECK_VERSION()
+# This checks for ISIS3.3.0+ style versioning
+AC_DEFUN([AX_PKG_ISIS_CHECK_VERSION],
+[
+  if test x"$HAVE_PKG_ISIS" != "xyes"; then
+    AC_MSG_ERROR([ISIS not found before hand, unable to find version now])
+  fi
+
+  echo "ISISROOT = $ISISROOT" >&AS_MESSAGE_LOG_FD
+  echo "PKG_PATHS_ISIS = $PKG_PATHS_ISIS" >&AS_MESSAGE_LOG_FD
+
+  if test -s "$ISISROOT"/version; then
+    # Found ISIS 3.3.0+ style versioning
+    ISIS_VERSION_PRE=`tr '\n' ' ' < $ISISROOT/version`
+  elif test -s "$PKG_PATHS_ISIS"/version; then
+    # Found ISIS 3.3.0+ style versioning
+    ISIS_VERSION_PRE=`tr '\n' ' ' < $PKG_PATHS_ISIS/version`
+  elif grep "std::string version" < "$ISISROOT"/inc/Constants.h > /dev/null; then
+    # Found ISIS < 3.3.0 style versioning
+    ISIS_VERSION_PRE=`grep "std::string version" < $ISISROOT/inc/Constants.h | sed 's/.*"\(.*\)".*/\1/'`
+  elif grep "std::string version" < "$PKG_PATHS_ISIS"/inc/Constants.h > /dev/null; then
+    # Found ISIS < 3.3.0 style versioning
+    ISIS_VERSION_PRE=`grep "std::string version" < $PKG_PATHS_ISIS/inc/Constants.h | sed 's/.*"\(.*\)".*/\1/'`
+  else
+    AC_MSG_ERROR([Unable to detect ISIS version])
+  fi
+
+  # Trim whitespaces leading an trailing
+  ISIS_VERSION=`echo $ISIS_VERSION_PRE | sed 's/^[ \t]*//;s/[ \t]*$//'`
+
+  echo "ISIS_VERSION_PRE = \"$ISIS_VERSION_PRE\"" >&AS_MESSAGE_LOG_FD
+  echo "ISIS_VERSION = \"$ISIS_VERSION\"" >&AS_MESSAGE_LOG_FD
+
+  AC_DEFINE_UNQUOTED([ISIS_VERSION],
+                     ["$ISIS_VERSION"],
+                     [The version of ISIS that this software was built against.])
+])