Special exit status when sudo is required

[AladW]

If an automatic sudo prompt isn't possible (#334), then aura should at least have a special exit code, rather than 1, when sudo is required. This way, you don't need to grep stderr or check for used arguments in bash wrappers.

[fosskers]

What's your use case?

[AladW]

Right now there's an ugly wrapper for people who expect automatic elevation from aura (as in pacaur and other helpers), from the ArchWiki:

function a(){
    AURA="$(aura "$@")"

    if echo "$AURA" | grep -q '^aura >>= .*You have to use `.*sudo.*` for that.*$'
    then
        sudo aura "$@"
    else
        echo "$AURA"
    fi
}

With an exit code of say 2, this could be reduced to:

function a() {
  aura "$@"
  (( $? = 2 )) && sudo aura "$@"
}

[AladW]

Looking at this again, grepping stdout really isn't reliable, unless you set LC_MESSAGES=C. See rmarquis/pacaur#267