# $Id: is-at-least,v 1.2 2000/04/01 20:49:47 pws Exp $ -*- shell-script -*- # # 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 $MACHTYPE && echo 'You could be running Mandrake!' function is-at-least() { emulate zsh ; setopt LOCAL_OPTIONS local IFS=".-" min_cnt=0 ver_cnt=0 part min_ver version min_ver=(${=1}) version=(${=2:-$ZSH_VERSION} 0) while (( $min_cnt <= ${#min_ver} )) { while [[ "$part" != <-> ]] { [[ $[++ver_cnt] > ${#version} ]] && return 0 part=${version[ver_cnt]##*[^0-9]} } [[ $[++min_cnt] > ${#min_ver} ]] && return 0 (( part > min_ver[min_cnt] )) && return 0 (( part < min_ver[min_cnt] )) && return 1 part='' } }