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Date: Sun, 31 Mar 2019 13:12:04 +0000
From: Daniel Shahaf <d.s@daniel.shahaf.name>
To: Anssi Saari <as@sci.fi>
Cc: zsh-users@zsh.org
Subject: Re: Confused about splitting
Message-ID: <20190331131204.mpyahlfvy2dxe63f@tarpaulin.shahaf.local2>
References: <vg3k1gf4dmf.fsf@coffee.modeemi.fi>
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In-Reply-To: <vg3k1gf4dmf.fsf@coffee.modeemi.fi>
User-Agent: NeoMutt/20170113 (1.7.2)

Anssi Saari wrote on Sun, Mar 31, 2019 at 12:06:16 +0300:
> foofunc3 () {
> 	if [[ $# -ge 1 ]]
> 	then
> 		if=$1 
> 	else
> 		if=eno1
> 	fi
> 	while read g
> 	do
> 	    if [[ $g =~ $if ]]
> 	    then
> 		first=${=g}
> 		break
> 	    fi
> 	done < /proc/net/dev
> 
> 	echo $first
> 	echo length of first is $#first
> }

Here's another solution:

     1	% () {
     2	    : ${1:=enp2s0}
     3	    local -a net_dev_lines=( "${(@f)"$(</proc/net/dev)"}" )
     4	    local line=${${(M)net_dev_lines:#*$1*}[1]}
     5	    print -r -- $=line
     6	    print -r -- ${#${=line}}
     7	  }
     8	17
     9	% 

Line 2 sets $1 to "enp2s0" if it's not already set.

Line 3 slurps the target file (the «$(<…)») and splits it into lines (the «${(f)}»).

Line 4 greps it (that's the :# and the (M) together) and takes the first result
(that's the outer «${…[1]}» construct).

Line 6 splits it, takes the length of the intermediate array, and prints that.

Cheers,

Daniel