# ===========================================================================
#    https://www.gnu.org/software/autoconf-archive/ax_compare_version.html
# ===========================================================================
#
# SYNOPSIS
#
#   AX_COMPARE_VERSION(VERSION_A, OP, VERSION_B, [ACTION-IF-TRUE], [ACTION-IF-FALSE])
#
# DESCRIPTION
#
#   This macro compares two version strings. Due to the various number of
#   minor-version numbers that can exist, and the fact that string
#   comparisons are not compatible with numeric comparisons, this is not
#   necessarily trivial to do in a autoconf script. This macro makes doing
#   these comparisons easy.
#
#   The six basic comparisons are available, as well as checking equality
#   limited to a certain number of minor-version levels.
#
#   The operator OP determines what type of comparison to do, and can be one
#   of:
#
#    eq  - equal (test A == B)
#    ne  - not equal (test A != B)
#    le  - less than or equal (test A <= B)
#    ge  - greater than or equal (test A >= B)
#    lt  - less than (test A < B)
#    gt  - greater than (test A > B)
#
#   Additionally, the eq and ne operator can have a number after it to limit
#   the test to that number of minor versions.
#
#    eq0 - equal up to the length of the shorter version
#    ne0 - not equal up to the length of the shorter version
#    eqN - equal up to N sub-version levels
#    neN - not equal up to N sub-version levels
#
#   When the condition is true, shell commands ACTION-IF-TRUE are run,
#   otherwise shell commands ACTION-IF-FALSE are run. The environment
#   variable 'ax_compare_version' is always set to either 'true' or 'false'
#   as well.
#
#   Examples:
#
#     AX_COMPARE_VERSION([3.15.7],[lt],[3.15.8])
#     AX_COMPARE_VERSION([3.15],[lt],[3.15.8])
#
#   would both be true.
#
#     AX_COMPARE_VERSION([3.15.7],[eq],[3.15.8])
#     AX_COMPARE_VERSION([3.15],[gt],[3.15.8])
#
#   would both be false.
#
#     AX_COMPARE_VERSION([3.15.7],[eq2],[3.15.8])
#
#   would be true because it is only comparing two minor versions.
#
#     AX_COMPARE_VERSION([3.15.7],[eq0],[3.15])
#
#   would be true because it is only comparing the lesser number of minor
#   versions of the two values.
#
#   Note: The characters that separate the version numbers do not matter. An
#   empty string is the same as version 0. OP is evaluated by autoconf, not
#   configure, so must be a string, not a variable.
#
#   The author would like to acknowledge Guido Draheim whose advice about
#   the m4_case and m4_ifvaln functions make this macro only include the
#   portions necessary to perform the specific comparison specified by the
#   OP argument in the final configure script.
#
# LICENSE
#
#   Copyright (c) 2008 Tim Toolan <[email protected]>
#
#   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. This file is offered as-is, without any
#   warranty.

#serial 13

dnl #########################################################################
AC_DEFUN([AX_COMPARE_VERSION], [
 AC_REQUIRE([AC_PROG_AWK])

 # Used to indicate true or false condition
 ax_compare_version=false

 # Convert the two version strings to be compared into a format that
 # allows a simple string comparison.  The end result is that a version
 # string of the form 1.12.5-r617 will be converted to the form
 # 0001001200050617.  In other words, each number is zero padded to four
 # digits, and non digits are removed.
 AS_VAR_PUSHDEF([A],[ax_compare_version_A])
 A=`echo "$1" | sed -e 's/\([[0-9]]*\)/Z\1Z/g' \
                    -e 's/Z\([[0-9]]\)Z/Z0\1Z/g' \
                    -e 's/Z\([[0-9]][[0-9]]\)Z/Z0\1Z/g' \
                    -e 's/Z\([[0-9]][[0-9]][[0-9]]\)Z/Z0\1Z/g' \
                    -e 's/[[^0-9]]//g'`

 AS_VAR_PUSHDEF([B],[ax_compare_version_B])
 B=`echo "$3" | sed -e 's/\([[0-9]]*\)/Z\1Z/g' \
                    -e 's/Z\([[0-9]]\)Z/Z0\1Z/g' \
                    -e 's/Z\([[0-9]][[0-9]]\)Z/Z0\1Z/g' \
                    -e 's/Z\([[0-9]][[0-9]][[0-9]]\)Z/Z0\1Z/g' \
                    -e 's/[[^0-9]]//g'`

 dnl # In the case of le, ge, lt, and gt, the strings are sorted as necessary
 dnl # then the first line is used to determine if the condition is true.
 dnl # The sed right after the echo is to remove any indented white space.
 m4_case(m4_tolower($2),
 [lt],[
   ax_compare_version=`echo "x$A
x$B" | sed 's/^ *//' | sort -r | sed "s/x${A}/false/;s/x${B}/true/;1q"`
 ],
 [gt],[
   ax_compare_version=`echo "x$A
x$B" | sed 's/^ *//' | sort | sed "s/x${A}/false/;s/x${B}/true/;1q"`
 ],
 [le],[
   ax_compare_version=`echo "x$A
x$B" | sed 's/^ *//' | sort | sed "s/x${A}/true/;s/x${B}/false/;1q"`
 ],
 [ge],[
   ax_compare_version=`echo "x$A
x$B" | sed 's/^ *//' | sort -r | sed "s/x${A}/true/;s/x${B}/false/;1q"`
 ],[
   dnl Split the operator from the subversion count if present.
   m4_bmatch(m4_substr($2,2),
   [0],[
     # A count of zero means use the length of the shorter version.
     # Determine the number of characters in A and B.
     ax_compare_version_len_A=`echo "$A" | $AWK '{print(length)}'`
     ax_compare_version_len_B=`echo "$B" | $AWK '{print(length)}'`

     # Set A to no more than B's length and B to no more than A's length.
     A=`echo "$A" | sed "s/\(.\{$ax_compare_version_len_B\}\).*/\1/"`
     B=`echo "$B" | sed "s/\(.\{$ax_compare_version_len_A\}\).*/\1/"`
   ],
   [[0-9]+],[
     # A count greater than zero means use only that many subversions
     A=`echo "$A" | sed "s/\(\([[0-9]]\{4\}\)\{m4_substr($2,2)\}\).*/\1/"`
     B=`echo "$B" | sed "s/\(\([[0-9]]\{4\}\)\{m4_substr($2,2)\}\).*/\1/"`
   ],
   [.+],[
     AC_WARNING(
       [invalid OP numeric parameter: $2])
   ],[])

   # Pad zeros at end of numbers to make same length.
   ax_compare_version_tmp_A="$A`echo $B | sed 's/./0/g'`"
   B="$B`echo $A | sed 's/./0/g'`"
   A="$ax_compare_version_tmp_A"

   # Check for equality or inequality as necessary.
   m4_case(m4_tolower(m4_substr($2,0,2)),
   [eq],[
     test "x$A" = "x$B" && ax_compare_version=true
   ],
   [ne],[
     test "x$A" != "x$B" && ax_compare_version=true
   ],[
     AC_WARNING([invalid OP parameter: $2])
   ])
 ])

 AS_VAR_POPDEF([A])dnl
 AS_VAR_POPDEF([B])dnl

 dnl # Execute ACTION-IF-TRUE / ACTION-IF-FALSE.
 if test "$ax_compare_version" = "true" ; then
   m4_ifvaln([$4],[$4],[:])dnl
   m4_ifvaln([$5],[else $5])dnl
 fi
]) dnl AX_COMPARE_VERSION

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