From: Bart Schaefer <schaefer@brasslantern.com>
To: zsh-users@sunsite.dk
Subject: Re: get output of a command in prompt
Date: Sun, 17 Sep 2006 09:58:28 -0700 [thread overview]
Message-ID: <060917095828.ZM20839@torch.brasslantern.com> (raw)
In-Reply-To: <20060917141420.GA5288@localhost.localdomain>
On Sep 17, 4:14pm, arno. wrote:
}
} Le Saturday 16 September 2006, à 21:01:55PM +0200, Frank a écrit :
} > zsh% PS1='$(printf "%s: %d" "This is a one" 1)-%% '
} > $(printf ": /home/hawk" "This is a one" 1)-% setopt promptsubst
} > This is a one: 1-%
}
} Yes, I've tried things like that, but the problem is that command output
} will be evaluated once, just when prompt is set up.
Not true. The quoting is important: Note where single quotes (') have
been used and where double quotes have. Compare:
PS1="$(printf '%s: %d' 'This is a one' 1)-%% " ;: This is the wrong way
PS1='$(printf "%s: %d" "This is a one" 1)-%% ' ;: This is the right way
} It will not be evaluated each time prompt is displayed
It will if the quoting is right and the promptsubst option has been set.
Question for zsh-workers: Why is the prompt string being evaluated more
than once on every zle reset?
torch% PS1='z is $((++z)) %# '
z is $((++z)) % setopt promptsubst
z is 2 % echo I expect three
I expect three
z is 5 %
z is 8 % echo I guess I should expect eleven
I guess I should expect eleven
z is 11 %
This could be expensive for command substitutions in the prompt.
next prev parent reply other threads:[~2006-09-17 17:59 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-09-16 18:49 arno.
2006-09-16 19:01 ` Frank Terbeck
2006-09-17 14:14 ` arno.
2006-09-17 16:58 ` Bart Schaefer [this message]
2006-09-17 17:09 ` Dan Nelson
2006-09-17 17:24 ` arno.
2006-09-17 17:22 ` Phil Pennock
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