# ===========================================================================

#       http://www.gnu.org/software/autoconf-archive/ax_is_release.html

# ===========================================================================

#

# SYNOPSIS

#

#   AX_IS_RELEASE(POLICY)

#

# DESCRIPTION

#

#   Determine whether the code is being configured as a release, or from

#   git. Set the ax_is_release variable to 'yes' or 'no'.

#

#   If building a release version, it is recommended that the configure

#   script disable compiler errors and debug features, by conditionalising

#   them on the ax_is_release variable.  If building from git, these

#   features should be enabled.

#

#   The POLICY parameter specifies how ax_is_release is determined. It can

#   take the following values:

#

#    * git-directory:  ax_is_release will be 'no' if a '.git' directory exists

#    * minor-version:  ax_is_release will be 'no' if the minor version number

#                      in $PACKAGE_VERSION is odd; this assumes

#                      $PACKAGE_VERSION follows the 'major.minor.micro' scheme

#    * micro-version:  ax_is_release will be 'no' if the micro version number

#                      in $PACKAGE_VERSION is odd; this assumes

#                      $PACKAGE_VERSION follows the 'major.minor.micro' scheme

#    * always:         ax_is_release will always be 'yes'

#    * never:          ax_is_release will always be 'no'

#

#   Other policies may be added in future.

#

# LICENSE

#

#   Copyright (c) 2015 Philip Withnall <philip@tecnocode.co.uk>

#

#   Copying and distribution of this file, with or without modification, are

#   permitted in any medium without royalty provided the copyright notice

#   and this notice are preserved.

#serial 3

AC_DEFUN([AX_IS_RELEASE],[

    AC_BEFORE([AC_INIT],[$0])

    m4_case([$1],

      [git-directory],[

        # $is_release = (.git directory does not exist)

        AS_IF([test -d .git],[ax_is_release=no],[ax_is_release=yes])

      ],

      [minor-version],[

        # $is_release = ($minor_version is even)

        minor_version=`echo "$PACKAGE_VERSION" | sed 's/[[^.]][[^.]]*.\([[^.]][[^.]]*\).*/\1/'`

        AS_IF([test "$(( $minor_version % 2 ))" -ne 0],

              [ax_is_release=no],[ax_is_release=yes])

      ],

      [micro-version],[

        # $is_release = ($micro_version is even)

        micro_version=`echo "$PACKAGE_VERSION" | sed 's/[[^.]]*\.[[^.]]*\.\([[^.]]*\).*/\1/'`

        AS_IF([test "$(( $micro_version % 2 ))" -ne 0],

              [ax_is_release=no],[ax_is_release=yes])

      ],

      [always],[ax_is_release=yes],

      [never],[ax_is_release=no],

      [

        AC_MSG_ERROR([Invalid policy. Valid policies: git-directory, minor-version.])

      ])

])