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References: <CAOzo9e5HaXkoZSaVtb8gfJzV7ZThY1dStC8ToxLK68WtSBZJLQ@mail.gmail.com>
 <CAOzo9e4phyeSNmPAY_hk3YChrivB_7y76b_PS+CXaMyATO2f-w@mail.gmail.com> <20200516205926.45d04fc5@tarpaulin.shahaf.local2>
In-Reply-To: <20200516205926.45d04fc5@tarpaulin.shahaf.local2>
From: Han Boetes <hboetes@gmail.com>
Date: Sun, 17 May 2020 01:10:26 +0200
Message-ID: <CAOzo9e7tnn=HYYUEBoij3Sd1RPPXrxXA2Rb8o8g4jm6YMcZ8cA@mail.gmail.com>
Subject: Re: zsh watch function
To: Daniel Shahaf <d.s@daniel.shahaf.name>
Cc: zsh-workers@zsh.org
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Hello Daniel,

That's very observant indeed. Here is a new version. I also choose printf
'\033c' in favour of the external command "clear."

Please tell if I missed anything else.

watch () {
    local PAD
    local IN=3D2
    case $1 in
        -n)
            IN=3D$2
            shift 2
            ;;
    esac
    printf '\033c'
    local CM=3D"$*"
    local LEFT=3D"$(printf 'Every %.1f: %s' $IN $CM)"
    ((PAD =3D COLUMNS - ${#LEFT}))
    while :
    do
        echo -nE "$LEFT"
        printf "%${PAD}s\n" "$HOST $(date)"
        eval "$CM"
        sleep $IN
        printf '\033c'
    done
}

On Sat, May 16, 2020 at 10:59 PM Daniel Shahaf <d.s@daniel.shahaf.name>
wrote:

> Han Boetes wrote on Sat, 16 May 2020 16:31 +0200:
> > And then I saw the padding light, here an improved version:
> >
> > watch () {
> >     IN=3D2
>
> The code isn't WARN_CREATE_GLOBAL-clean.
>
> >     CM=3D"$*"
> >     LEFT=3D"$(printf 'Every %.1f: %s' $IN $CM)"
> =E2=8B=AE
> >         printf "$LEFT%${PAD}s\n" "$HN $(date)"
>
> $LEFT may contain unescaped percent signs from the input.
>
> >         eval "$CM"
> >         sleep $IN
> >         clear
> >     done
> > }
>
> For context to others, note that watch(1) on FreeBSD does something
> entirely different to what watch(1) does on Linux.
>

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