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Date: Tue, 21 Mar 2017 14:02:13 +0100
From: Sebastian Gniazdowski <psprint@zdharma.org>
To: zsh-workers@zsh.org
Message-ID: <etPan.58d12455.2eb141f2.378f@MacMini.local>
Subject: RE: (m)-flag for boundary cases
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> Try this=3F =C2=A0Works for characters that are 2 columns wide. =C2=A0I=
f you have
> a mix of character widths, probably a custom math function to use in th=
e
> subscript ...
>=C2=A0
> dw=3D3 =C2=A0 =C2=A0=23 Desired width
> echo =24=7B(mr:dw::=5F:)a=5B1,=24=7B(m)=23a=5B1,dw-1=5D=7D>dw=3Fdw/2:dw=
=5D=7D

Mixed character widths are possibile. =46ollowing cases can occur:

1. a=3D=22=E6=B8=AC=E8=A9=A6a=E5=8F=A5=22; echo =24=7B(mr:7:)a=7D,
=E6=B8=AC=E8=A9=A6a=E5=8F=A5,

2.=C2=A0a=3D=22=E6=B8=AC=E8=A9=A6a=E5=8F=A5=22; echo =24=7B(mr:6:)a=7D,
=E6=B8=AC=E8=A9=A6a=E5=8F=A5,

3.=C2=A0a=3D=22=E6=B8=AC=E8=A9=A6a=E5=8F=A5=22; echo =24=7B(mr:5:)a=7D,
=E6=B8=AC=E8=A9=A6a,

4.=C2=A0a=3D=22=E6=B8=AC=E8=A9=A6a=E5=8F=A5=22; echo =24=7B(mr:4:)a=7D,
=E6=B8=AC=E8=A9=A6,

Now a try with minus-one:
------------------------

1. a=3D=22=E6=B8=AC=E8=A9=A6a=E5=8F=A5=22; echo =24=7B(mr:7-1:)a=7D,
=E6=B8=AC=E8=A9=A6a=E5=8F=A5,

2.=C2=A0a=3D=22=E6=B8=AC=E8=A9=A6a=E5=8F=A5=22; echo =24=7B(mr:6-1:)a=7D,=

=E6=B8=AC=E8=A9=A6a,

3.=C2=A0a=3D=22=E6=B8=AC=E8=A9=A6a=E5=8F=A5=22; echo =24=7B(mr:5-1:)a=7D,=

=E6=B8=AC=E8=A9=A6, =23 problem

4.=C2=A0a=3D=22=E6=B8=AC=E8=A9=A6a=E5=8F=A5=22; echo =24=7B(mr:4-1:)a=7D,=

=E6=B8=AC=E8=A9=A6,

So if one could fix the trailing-a absence, it seems it would work. Did f=
ollowing:

dw=3D5; a=3D=22=E6=B8=AC=E8=A9=A6a=E5=8F=A5=22; echo =24=7B(mr,=24=7B(m)=23=
=24=7B(mr:dw:)a=7D=5B-1=5D=7D > 1 =3F dw-1 : dw,)a=7D
=E6=B8=AC=E8=A9=A6a
dw=3D3; a=3D=22=E6=B8=AC=E8=A9=A6a=E5=8F=A5=22; echo =24=7B(mr,=24=7B(m)=23=
=24=7B(mr:dw:)a=7D=5B-1=5D=7D > 1 =3F dw-1 : dw,)a=7D
=E6=B8=AC

But not sure if I will commit this.

--
Sebastian Gniazdowski
psprint=40zdharma.org