Re: [gentoo-user] Bash prompt colours

[Grant Taylor]

Some drive-by after-the-fact comments:

On 12/6/21 4:03 PM, Frank Steinmetzger wrote:
>      [ "$MC_SID" ] && PS1_JOBS_COUNT="${PS1_JOBS_COUNT}MC "
>      [ "$RANGER_LEVEL" ] && PS1_JOBS_COUNT="${PS1_JOBS_COUNT}R "

I've taken to using things like the following:

    PS1_JOBS_COUNT="${PS1_JOBS_COUNT}${MC_SID:+MC }${RANGER_LEVEL:+R }"

Leverage Bash's (and Zsh's) expansion conditional.  If the variable is 
set, then expand it to a different value.

    ${VARIABLE:+alternate text to show if VARIABLE is set}

> if [[ -z "$PROMPT_COMMAND" ]]; then
>     PROMPT_COMMAND=__jobsprompt
> else
>     PROMPT_COMMAND="$PROMPT_COMMAND ; __jobsprompt"
> fi

Is there a reason to not simply do the following, eliminating the if 
conditional:

    PROMPT_COMMAND=${PROMPT_COMMAND:+${PROMPT_COMMAND} ; __jobsprompt}



-- 
Grant. . . .
unix || die