2014/06/26 01:07, Ben Fritz <[email protected]> wrote:
> On Tuesday, June 24, 2014 10:39:28 AM UTC-5, Ben Fritz wrote:
>>
>> I thought your sort could be done in Vim with 2 passes, but unfortunately it
>> does not work:
>>
>> sort r /^\d\+/
>> sort! /.*#/
>>
>
> Bram, any chance that a way to guarantee a stable sort could be included,
I guess the :sort command *is* stable (although the sort() function is not).
If you look into ex_cmds.c, end of the function sort_compare(), lines 340-341:
if (result == 0)
return (int)(l1.lnum - l2.lnum);
this indicates that if the two lines are "equal" by the current comparison,
then just compare by the line number; this should result in the stable sort.
I think the problem is in the way the '!' flag is treated.
Suppose we have the following lines:
02 bb
02 aa
01 bb
01 aa
If I run
:sort r /\a\a/ (or :sort /^.../)
then I get the following
02 aa
01 aa
02 bb
01 bb
This is as expected, and the sort is "stable". But if I run
:sort! r /\a\a/ (or :sort! /^.../)
then I get
01 bb
02 bb
01 aa
02 aa
which may be not what you expect.
I guess the effect of the '!' flag is just to reverse the order of the
final output.
:sort! r /\a\a/
is equivalent to
:sort r /\a\a/
and reverse the order of whole output (reading the output from bottom
to top).
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