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From: Bart Schaefer <schaefer@brasslantern.com>
Message-Id: <170320094333.ZM29062@torch.brasslantern.com>
Date: Mon, 20 Mar 2017 09:43:33 -0700
In-Reply-To: <1490020425.2614066.917182456.0E56E387@webmail.messagingengine.com>
Comments: In reply to Sebastian Gniazdowski <psprint3@fastmail.com>
        "(m)-flag for boundary cases" (Mar 20,  7:33am)
References: <1490020425.2614066.917182456.0E56E387@webmail.messagingengine.com>
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To: zsh-workers@zsh.org
Subject: Re: (m)-flag for boundary cases
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On Mar 20,  7:33am, Sebastian Gniazdowski wrote:
} Subject: (m)-flag for boundary cases
}
} Hello,
} 
} % a="0x6F220x5B57"
} % echo ${(mr:3::_:)a}
} 0x6F220x5B57
} % echo ${(mr:2::_:)a}
} 0x6F22
} 
} I think it would be better to trim first case down to single Asian
} character, and display: 0x6F22_. The point is that it gives predictable
} width.

Try this?  Works for characters that are 2 columns wide.  If you have
a mix of character widths, probably a custom math function to use in the
subscript ...

dw=3	# Desired width
echo ${(mr:dw::_:)a[1,${(m)#a[1,dw-1]}>dw?dw/2:dw]}