From: Bart Schaefer <schaefer@brasslantern.com>
To: zsh-workers@zsh.org
Subject: Re: (m)-flag for boundary cases
Date: Sun, 2 Apr 2017 15:57:49 -0700 [thread overview]
Message-ID: <170402155749.ZM9915@torch.brasslantern.com> (raw)
In-Reply-To: <etPan.58d12455.2eb141f2.378f@MacMini.local>
On Mar 21, 2:02pm, Sebastian Gniazdowski wrote:
} Subject: RE: (m)-flag for boundary cases
}
} > dw=3 # Desired width
} > echo ${(mr:dw::_:)a[1,${(m)#a[1,dw-1]}>dw?dw/2:dw]}
}
} Mixed character widths are possibile.
}
[...]
}
} So if one could fix the trailing-a absence, it seems it would work.
# dw is the "desired width" [or "display width"] function
# Declare to accept a string because subscripts hate extra commas,
# and because we need to pass a parameter by name not by math value.
# Call it in math context (e.g., a scalar slice subscript) like:
# dw(paramname:width)
# Returns largest index w of a full character in $paramname, such
# that ${paramname[1,w]} occupies $width or fewer display positions.
dw() {
integer w
set -- "${(@s,:,)1}"
[[ -z ${(P)1} ]] && return -1
for ((w=$2; ${(m)#${(P)1}[1,w]} > $2; w-- )); do :; done
return w
}
functions -M -s dw
Given the above this example --
echo ${(mr:9::_:)string[1,dw(string:9)]}
-- always outputs a string nine display positions wide, padded on the
right with underscores, regardless of the mix of character widths in
the value of $string.
Optimizations, if any, left to the reader.
next prev parent reply other threads:[~2017-04-02 22:57 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-21 13:02 Sebastian Gniazdowski
2017-04-02 22:57 ` Bart Schaefer [this message]
-- strict thread matches above, loose matches on Subject: below --
2017-03-20 14:33 Sebastian Gniazdowski
2017-03-20 16:00 ` Sebastian Gniazdowski
2017-03-20 16:43 ` Bart Schaefer
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