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hg showoptlist 

dummy command to show option descriptions

options:

 -s --opt1 短名          short width
 -m --opt2 MIDDLE_       middle width
 -l --opt3 長い長い名前  long width

use "hg -v help showoptlist" to show global options
% check alignment of user names in annotate
        短名: first line(2)
     MIDDLE_: second line(2)
長い長い名前: third line(2)
% check alignment of filenames in diffstat
 MIDDLE_      |  1 +
 短名         |  1 +
 長い長い名前 |  1 +
 3 files changed, 3 insertions(+), 0 deletions(-)
marked working directory as branch 短名
marked working directory as branch MIDDLE_
marked working directory as branch 長い長い名前
% check alignment of branches
tip                                5:d745ff46155b
長い長い名前                       4:9259be597f19
MIDDLE_                            3:b06c5b6def9e
短名                               2:64a70663cee8
% check alignment of tags
tip                                5:d745ff46155b
長い長い名前                       4:9259be597f19
MIDDLE_                            3:b06c5b6def9e
短名                               2:64a70663cee8