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From: Bart Schaefer <schaefer@brasslantern.com>
Message-id: <101205134109.ZM502@torch.brasslantern.com>
Date: Sun, 05 Dec 2010 13:41:09 -0800
In-reply-to: <AANLkTikjsQPt5QCCJnFGRJswVq_N=3P+fNnYhCSYdkQ0@mail.gmail.com>
Comments: In reply to Mikael Magnusson <mikachu@gmail.com>
 "PROMPT_SP and empty PROMPT_EOL_MARK" (Dec  5, 10:10pm)
References: <AANLkTikjsQPt5QCCJnFGRJswVq_N=3P+fNnYhCSYdkQ0@mail.gmail.com>
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To: zsh workers <zsh-workers@zsh.org>
Subject: Re: PROMPT_SP and empty PROMPT_EOL_MARK
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On Dec 5, 10:10pm, Mikael Magnusson wrote:
}
}               If not set or empty, the default  behavior
}               is equivalent to the value `%B%S%#%s%b'.
} 
} What is the rationale for disallowing an empty indicator?

Probably so that you can declare it as a local without having to
explicitly unset it afterwards.

You can get the effect you want with something like

PROMPT_EOL_MARK='%{%}'

or

PROMPT_EOL_MARK='%<<'

In fact because prompt expansion is applied to PROMPT_EOL_MARK *before*
the precmd functions are called, there are all sorts of interesting side
effects I hadn't previously considered ...