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According to Pádraig Brady on 10/21/2008 4:04 PM:
> echo "$ver" | sed '
> s/^\([0-9]\{,\}\)\.\([0-9]\{,\}\)[.0]*$/\1.\2.0/; #1.10 ->
> 1.10.0
> s/^\([0-9]\{,\}\)\.\([0-9]\{,\}\)\([a-z]\)/\1.\2.99\3/; #1.10a ->
> 1.10.99a
For what it's worth, Autoconf does this by converting \([0-9]+\)\([a-z]+\)
to \1+1, -1, radix36(\2). In other words, 1.10a becomes 1.11.-1.10.
- From there, it is a simple numerical comparison, supplying a 0 for any
implicit field, and declaring results at the left-most field that differs:
1.10.x < 1.11.-1.x, but 1.11.-1 < 1.11.0
Hmm. Since bootstrap requires the existence of autoconf, why not just use
autoconf, instead of reimplementing this in sed?
echo 'm4_divert(0)m4_version_compare('$ver,$prereq')' \
| autom4te --language=m4sugar -
outputs -1 if $ver is smaller, 0 if equal, 1 if greater than $prereq.
- --
Don't work too hard, make some time for fun as well!
Eric Blake [EMAIL PROTECTED]
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