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Diffstat (limited to 'Functions/Misc/is-at-least')
| -rw-r--r-- | Functions/Misc/is-at-least | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/Functions/Misc/is-at-least b/Functions/Misc/is-at-least new file mode 100644 index 000000000..6debe4c5a --- /dev/null +++ b/Functions/Misc/is-at-least @@ -0,0 +1,38 @@ +# +# 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 $ZSH_VERSION || print 'Something fishy here.' + +emulate zsh ; setopt LOCAL_OPTIONS + +local IFS=".-" min_cnt=0 ver_cnt=0 part min_ver version + +min_ver=(${=1}) +version=(${=2:-$ZSH_VERSION} 0) + +while (( $min_cnt <= ${#min_ver} )); do + while [[ "$part" != <-> ]]; do + (( ++ver_cnt > ${#version} )) && return 0 + part=${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 |