Presently, Midnight Commander initialises interactive instances of bash in such a way that it fails to acknowledge that it is possible for PROMPT_COMMAND to be an array, as is supported since bash 5.1. This is material to Gentoo because >=bash-5.1_p16-r8 and >=bash-5.2-p26-r1 do initialise the variable as an array. Besides which, anyone might do the same in their own ~/.bashrc file. I shall attach a patch that I think is suitable for Gentoo, whose commit message will contain a detailed rationale.
Created attachment 891294 [details, diff] mc-4.8.31-clear-PROMPT_COMMAND.patch
To comment further, upstream ought to be doing something like this: if eval '[[ ${PROMPT_COMMAND@a} == *a* ]]' 2>/dev/null; then PROMPT_COMMAND+=('mc crap goes here') else PROMPT_COMMAND+=';mc crap goes here' fi I maintain that the attached patch is likely the better solution for Gentoo, however.
There are times at which I wish I could edit comments. Rather, upstream could fix it from their perspective by doing something like: if eval '[[ ${PROMPT_COMMAND@a} == *a* ]]' 2>/dev/null; then PROMPT_COMMAND+=('mc crap goes here') else PROMPT_COMMAND+=${PROMPT_COMMAND+$PROMPT_COMMAND$'\n'}'mc crap goes here' fi
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=3d2dfa65ffe23e2ded46450a7249c5a3034b8c24 commit 3d2dfa65ffe23e2ded46450a7249c5a3034b8c24 Author: Viorel Munteanu <ceamac@gentoo.org> AuthorDate: 2025-01-23 12:40:12 +0000 Commit: Viorel Munteanu <ceamac@gentoo.org> CommitDate: 2025-01-23 15:50:24 +0000 app-misc/mc: add 4.8.33 Closes: https://bugs.gentoo.org/930401 Signed-off-by: Viorel Munteanu <ceamac@gentoo.org> app-misc/mc/Manifest | 1 + app-misc/mc/mc-4.8.33.ebuild | 139 +++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 140 insertions(+)