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users/21082 (expanded): a more complete sorting of version strings that are not in the form of zsh version numbers; additional explanatory comment

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Barton E. Schaefer 2015-12-19 22:03:34 -08:00
parent 7611e78ad1
commit aedff53d1f
2 changed files with 23 additions and 1 deletions
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20
Functions/Misc/is-at-least
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@ -13,10 +13,16 @@
# is-at-least 3.1.0 && setopt HIST_REDUCE_BLANKS
# is-at-least 586 $MACHTYPE && echo 'You could be running Mandrake!'
# is-at-least $ZSH_VERSION || print 'Something fishy here.'
#
# Note that segments that contain no digits at all are ignored, and leading
# text is discarded if trailing digits follow, because this was the meaning
# of certain zsh version strings in the early 2000s. Other segments that
# begin with digits are compared using NUMERIC_GLOB_SORT semantics, and any
# other segments starting with text are compared lexically.
emulate -L zsh
local IFS=".-" min_cnt=0 ver_cnt=0 part min_ver version
local IFS=".-" min_cnt=0 ver_cnt=0 part min_ver version order
min_ver=(${=1})
version=(${=2:-$ZSH_VERSION} 0)
@ -24,6 +30,18 @@ version=(${=2:-$ZSH_VERSION} 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