New fancy progress bars writing new lines instead of updating original

The new pretty progress bars are quite nice. One issue I am ecountering,

however, is demonstrated in the snippet below:

???????????????????? 71% ??????????????????????????????????????????????????????????????????????????????????????????????

???????????????????? 74% ???????????????????????????????????????????????????????????????????????????????????????????????????

???????????????????? 77% ???????????????????????????????????????????????????????????????????????????????????????????????????????

???????????????????? 81% ???????????????????????????????????????????????????????????????????????????????????????????????????????????

???????????????????? 84% ???????????????????????????????????????????????????????????????????????????????????????????????????????????????

???????????????????? 87% ??????????????????????????????????????????????????????????????????????????????????????????????????????????????????

???????????????????? 90% ??????????????????????????????????????????????????????????????????????????????????????????????????????????????????

When preceeding text contains double-width characters, progress bar updates end

up printing new lines instead of overwriting the original. When the preceeding

text is ascii, such as for substitute downloads, then the bars work

beautifully.

My guess is that the width-calculation simply forgets to account for possible

double-width charaters in the text snippet.

Anyone else seeing this?

Cheers,

B. Wilson

Le Sat, 26 Aug 2023 10:25:53 +0900,

elaexuotee--- via Bug reports for GNU Guix <bug-guix@gnu.org> a écrit :

I don't think it's specific to the fancy bars, and I was able to

reproduce with "LANG=ja_JP.UTF-8 guix pull".

I sent a patch, now tracked https://issues.guix.gnu.org/65546,which

fixes the issue.

To test it, I did:

msgfmt po/guix/ja.po

cd ../..

mkdir -p ja/LC_MESSAGES

mv messages.mo ja/LC_MESSAGES/guix.mo

./configure --localstatedir=/var --sysconfdir=/etc --localedir=$(pwd)

make

./pre-inst-env guix pull

(if you don't specify a localedir, it'll try to find the translations

in /usr by default)

No more newlines :)

As a CJK user hoping Julien's patch is accepted soon, this message is my "+1".