m4/ax_compare_version.m4

   1 # ===========================================================================
   2 #    https://www.gnu.org/software/autoconf-archive/ax_compare_version.html
   3 # ===========================================================================
   4 #
   5 # SYNOPSIS
   6 #
   7 #   AX_COMPARE_VERSION(VERSION_A, OP, VERSION_B, [ACTION-IF-TRUE], [ACTION-IF-FALSE])
   8 #
   9 # DESCRIPTION
  10 #
  11 #   This macro compares two version strings. Due to the various number of
  12 #   minor-version numbers that can exist, and the fact that string
  13 #   comparisons are not compatible with numeric comparisons, this is not
  14 #   necessarily trivial to do in a autoconf script. This macro makes doing
  15 #   these comparisons easy.
  16 #
  17 #   The six basic comparisons are available, as well as checking equality
  18 #   limited to a certain number of minor-version levels.
  19 #
  20 #   The operator OP determines what type of comparison to do, and can be one
  21 #   of:
  22 #
  23 #    eq  - equal (test A == B)
  24 #    ne  - not equal (test A != B)
  25 #    le  - less than or equal (test A <= B)
  26 #    ge  - greater than or equal (test A >= B)
  27 #    lt  - less than (test A < B)
  28 #    gt  - greater than (test A > B)
  29 #
  30 #   Additionally, the eq and ne operator can have a number after it to limit
  31 #   the test to that number of minor versions.
  32 #
  33 #    eq0 - equal up to the length of the shorter version
  34 #    ne0 - not equal up to the length of the shorter version
  35 #    eqN - equal up to N sub-version levels
  36 #    neN - not equal up to N sub-version levels
  37 #
  38 #   When the condition is true, shell commands ACTION-IF-TRUE are run,
  39 #   otherwise shell commands ACTION-IF-FALSE are run. The environment
  40 #   variable 'ax_compare_version' is always set to either 'true' or 'false'
  41 #   as well.
  42 #
  43 #   Examples:
  44 #
  45 #     AX_COMPARE_VERSION([3.15.7],[lt],[3.15.8])
  46 #     AX_COMPARE_VERSION([3.15],[lt],[3.15.8])
  47 #
  48 #   would both be true.
  49 #
  50 #     AX_COMPARE_VERSION([3.15.7],[eq],[3.15.8])
  51 #     AX_COMPARE_VERSION([3.15],[gt],[3.15.8])
  52 #
  53 #   would both be false.
  54 #
  55 #     AX_COMPARE_VERSION([3.15.7],[eq2],[3.15.8])
  56 #
  57 #   would be true because it is only comparing two minor versions.
  58 #
  59 #     AX_COMPARE_VERSION([3.15.7],[eq0],[3.15])
  60 #
  61 #   would be true because it is only comparing the lesser number of minor
  62 #   versions of the two values.
  63 #
  64 #   Note: The characters that separate the version numbers do not matter. An
  65 #   empty string is the same as version 0. OP is evaluated by autoconf, not
  66 #   configure, so must be a string, not a variable.
  67 #
  68 #   The author would like to acknowledge Guido Draheim whose advice about
  69 #   the m4_case and m4_ifvaln functions make this macro only include the
  70 #   portions necessary to perform the specific comparison specified by the
  71 #   OP argument in the final configure script.
  72 #
  73 # LICENSE
  74 #
  75 #   Copyright (c) 2008 Tim Toolan <toolan@ele.uri.edu>
  76 #
  77 #   Copying and distribution of this file, with or without modification, are
  78 #   permitted in any medium without royalty provided the copyright notice
  79 #   and this notice are preserved. This file is offered as-is, without any
  80 #   warranty.
  81
  82 #serial 13
  83
  84 dnl #########################################################################
  85 AC_DEFUN([AX_COMPARE_VERSION], [
  86   AC_REQUIRE([AC_PROG_AWK])
  87
  88   # Used to indicate true or false condition
  89   ax_compare_version=false
  90
  91   # Convert the two version strings to be compared into a format that
  92   # allows a simple string comparison.  The end result is that a version
  93   # string of the form 1.12.5-r617 will be converted to the form
  94   # 0001001200050617.  In other words, each number is zero padded to four
  95   # digits, and non digits are removed.
  96   AS_VAR_PUSHDEF([A],[ax_compare_version_A])
  97   A=`echo "$1" | sed -e 's/\([[0-9]]*\)/Z\1Z/g' \
  98                      -e 's/Z\([[0-9]]\)Z/Z0\1Z/g' \
  99                      -e 's/Z\([[0-9]][[0-9]]\)Z/Z0\1Z/g' \
 100                      -e 's/Z\([[0-9]][[0-9]][[0-9]]\)Z/Z0\1Z/g' \
 101                      -e 's/[[^0-9]]//g'`
 102
 103   AS_VAR_PUSHDEF([B],[ax_compare_version_B])
 104   B=`echo "$3" | sed -e 's/\([[0-9]]*\)/Z\1Z/g' \
 105                      -e 's/Z\([[0-9]]\)Z/Z0\1Z/g' \
 106                      -e 's/Z\([[0-9]][[0-9]]\)Z/Z0\1Z/g' \
 107                      -e 's/Z\([[0-9]][[0-9]][[0-9]]\)Z/Z0\1Z/g' \
 108                      -e 's/[[^0-9]]//g'`
 109
 110   dnl # In the case of le, ge, lt, and gt, the strings are sorted as necessary
 111   dnl # then the first line is used to determine if the condition is true.
 112   dnl # The sed right after the echo is to remove any indented white space.
 113   m4_case(m4_tolower($2),
 114   [lt],[
 115     ax_compare_version=`echo "x$A
 116 x$B" | sed 's/^ *//' | sort -r | sed "s/x${A}/false/;s/x${B}/true/;1q"`
 117   ],
 118   [gt],[
 119     ax_compare_version=`echo "x$A
 120 x$B" | sed 's/^ *//' | sort | sed "s/x${A}/false/;s/x${B}/true/;1q"`
 121   ],
 122   [le],[
 123     ax_compare_version=`echo "x$A
 124 x$B" | sed 's/^ *//' | sort | sed "s/x${A}/true/;s/x${B}/false/;1q"`
 125   ],
 126   [ge],[
 127     ax_compare_version=`echo "x$A
 128 x$B" | sed 's/^ *//' | sort -r | sed "s/x${A}/true/;s/x${B}/false/;1q"`
 129   ],[
 130     dnl Split the operator from the subversion count if present.
 131     m4_bmatch(m4_substr($2,2),
 132     [0],[
 133       # A count of zero means use the length of the shorter version.
 134       # Determine the number of characters in A and B.
 135       ax_compare_version_len_A=`echo "$A" | $AWK '{print(length)}'`
 136       ax_compare_version_len_B=`echo "$B" | $AWK '{print(length)}'`
 137
 138       # Set A to no more than B's length and B to no more than A's length.
 139       A=`echo "$A" | sed "s/\(.\{$ax_compare_version_len_B\}\).*/\1/"`
 140       B=`echo "$B" | sed "s/\(.\{$ax_compare_version_len_A\}\).*/\1/"`
 141     ],
 142     [[0-9]+],[
 143       # A count greater than zero means use only that many subversions
 144       A=`echo "$A" | sed "s/\(\([[0-9]]\{4\}\)\{m4_substr($2,2)\}\).*/\1/"`
 145       B=`echo "$B" | sed "s/\(\([[0-9]]\{4\}\)\{m4_substr($2,2)\}\).*/\1/"`
 146     ],
 147     [.+],[
 148       AC_WARNING(
 149         [invalid OP numeric parameter: $2])
 150     ],[])
 151
 152     # Pad zeros at end of numbers to make same length.
 153     ax_compare_version_tmp_A="$A`echo $B | sed 's/./0/g'`"
 154     B="$B`echo $A | sed 's/./0/g'`"
 155     A="$ax_compare_version_tmp_A"
 156
 157     # Check for equality or inequality as necessary.
 158     m4_case(m4_tolower(m4_substr($2,0,2)),
 159     [eq],[
 160       test "x$A" = "x$B" && ax_compare_version=true
 161     ],
 162     [ne],[
 163       test "x$A" != "x$B" && ax_compare_version=true
 164     ],[
 165       AC_WARNING([invalid OP parameter: $2])
 166     ])
 167   ])
 168
 169   AS_VAR_POPDEF([A])dnl
 170   AS_VAR_POPDEF([B])dnl
 171
 172   dnl # Execute ACTION-IF-TRUE / ACTION-IF-FALSE.
 173   if test "$ax_compare_version" = "true" ; then
 174     m4_ifvaln([$4],[$4],[:])dnl
 175     m4_ifvaln([$5],[else $5])dnl
 176   fi
 177 ]) dnl AX_COMPARE_VERSION