# # Test whether $ZSH_VERSION (or some value of your choice, if a second argument # is provided) is greater than or equal to x.y.z-r (in argument one). In fact, # it'll accept any dot/dash-separated string of numbers as its second argument # and compare it to the dot/dash-separated first argument. Leading non-number # parts of a segment (such as the "zefram" in 3.1.2-zefram4) are not considered # when the comparison is done; only the numbers matter. Any left-out segments # in the first argument that are present in the version string compared are # considered as zeroes, eg 3 == 3.0 == 3.0.0 == 3.0.0.0 and so on. # # Usage examples: # is-at-least 3.1.6-15 && setopt NO_GLOBAL_RCS # is-at-least 3.1.0 && setopt HIST_REDUCE_BLANKS # is-at-least 586 $MACHTYPE && echo 'You could be running Mandrake!' # is-at-least $ZSH_VERSION || print 'Something fishy here.' # # Note that segments that contain no digits at all are ignored, and leading # text is discarded if trailing digits follow, because this was the meaning # of certain zsh version strings in the early 2000s. Other segments that # begin with digits are compared using NUMERIC_GLOB_SORT semantics, and any # other segments starting with text are compared lexically. emulate -L zsh local IFS=".-" min_cnt=0 ver_cnt=0 part min_ver version order : ${2=$ZSH_VERSION} # sort out the easy corner cases first [[ $1 = $2 ]] && return 0 # same version [[ -n $2 ]] || return 1 # no version min_ver=(${=1}) version=(${=2} 0) while (( $min_cnt <= ${#min_ver} )); do while [[ "$part" != <-> ]]; do (( ++ver_cnt > ${#version} )) && return 0 if [[ ${version[ver_cnt]} = *[0-9][^0-9]* ]]; then # Contains a number followed by text. Not a zsh version string. order=( ${version[ver_cnt]} ${min_ver[ver_cnt]} ) if [[ ${version[ver_cnt]} = <->* ]]; then # Leading digits, compare by sorting with numeric order. [[ $order != ${${(On)order}} ]] && return 1 else # No leading digits, compare by sorting in lexical order. [[ $order != ${${(O)order}} ]] && return 1 fi [[ $order[1] != $order[2] ]] && return 0 fi part=${version[ver_cnt]##*[^0-9]} done while true; do (( ++min_cnt > ${#min_ver} )) && return 0 [[ ${min_ver[min_cnt]} = <-> ]] && break done (( part > min_ver[min_cnt] )) && return 0 (( part < min_ver[min_cnt] )) && return 1 part='' done