From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <zsh-users-return-19770-mason-zsh=primenet.com.au@zsh.org>
Received: (qmail 22788 invoked by alias); 23 Jan 2015 15:40:18 -0000
Mailing-List: contact zsh-users-help@zsh.org; run by ezmlm
Precedence: bulk
X-No-Archive: yes
List-Id: Zsh Users List <zsh-users.zsh.org>
List-Post: <mailto:zsh-users@zsh.org>
List-Help: <mailto:zsh-users-help@zsh.org>
X-Seq: 19770
Received: (qmail 14196 invoked from network); 23 Jan 2015 15:40:17 -0000
X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on f.primenet.com.au
X-Spam-Level: 
X-Spam-Status: No, score=-2.7 required=5.0 tests=BAYES_00,DKIM_SIGNED,
	DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FROM,HTML_MESSAGE,RCVD_IN_DNSWL_LOW
	autolearn=ham version=3.3.2
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=gmail.com; s=20120113;
        h=mime-version:from:date:message-id:subject:to:content-type;
        bh=fJmrFjePoJHAYwpTbsm4p/viVvIUTn3qYiTbPguexAo=;
        b=HLS+Ny0w1yudSd7LM7zyMqTvZ9ZaE2IHeKnWRdh1lNhuNMti1HjRHBoGzNZT9rOER4
         nr+Zfis094Sgdc50sSQYuYMIZcl5BXdRiHUu3m6C+g8l6bU6OqUKec6ZBbRtygWbBf5C
         B5KT2bEsnOBRTeLxrfFe5HPqRGhVukiBauOLJ/qck7C1Uv+K7hN+eHOKp+kMyPlwu1X9
         44tK5MadAn2HZ3x3AKiNwcctF3IdLid3k/ZPP6OBxLA2OahjjHw7MJnyrZiiTWL5l1C9
         FnpLB2Qq8MbYGRT/rIqSfA5vWp8iMxiKqVaErGh55T75xiA2BmeikOMu1b1AwY3YnyRo
         qwsA==
X-Received: by 10.107.12.196 with SMTP id 65mr4439158iom.71.1422027612931;
 Fri, 23 Jan 2015 07:40:12 -0800 (PST)
MIME-Version: 1.0
From: TJ Luoma <luomat@gmail.com>
Date: Fri, 23 Jan 2015 10:39:32 -0500
Message-ID: <CADjGqHt4bv3QGOCne_yktMVbeu+TbC+jj_q8wVvHO-9TQt_4ww@mail.gmail.com>
Subject: zparseopts help
To: Zsh-Users List <zsh-users@zsh.org>
Content-Type: multipart/alternative; boundary=001a113f8fd2bacdf4050d539a05

--001a113f8fd2bacdf4050d539a05
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

As I've mentioned before, I have been using zsh forever but feel like I
missed out on learning about 97% of what it can do.

For example, today I learned about zparseopts.

(Feel free to mock.)

I took a look through the `man` entry, but=E2=80=A6 I don't know what it is=
 about
my brain, but I can read and re-read man pages and still fail to understand
what it is saying. I do much better with examples.

I did some googling and found
http://emg-2.blogspot.com/2008/01/zsh-unique-features.html and once I had
that I could go back and look at the `man` page to understand what it was
doing.

So here is my first attempt at using `zparseopts`:

zparseopts -D -E -A MyVariableNameHere -- a b -orange -grape -apple

if (( ${+MyVariableNameHere[-a]} )); then
        echo "Apple";
fi

if (( ${+MyVariableNameHere[--apple]} )); then
        echo "Apple";
fi

if (( ${+MyVariableNameHere[-b]} )); then
        echo "Banana";
fi

if (( ${+MyVariableNameHere[--orange]} )); then
        echo "orange";
fi

if (( ${+MyVariableNameHere[--grape]} )); then
        echo "grape";
fi

Questions:

1. Is there a way to combine the -a and --apple statements into one?

2. Are a series of 'if' statements the best way to handle these sorts of
options?

What I have been doing is something like this:

for MyVariableNameHere in "$@"
do
case "$MyVariableNameHere" in
-a|--apple)
echo "Apple"
shift
;;
-b|--banana)
echo "Banana"
shift
;;
esac
done

but that has the disadvantage of not being able to parse "-ab" as two
separate arguments. OTOH it's very readable and I don't have to worry about
very many chances of missing a closing bracket or brace!

TjL

ps - if anyone knows of a good place for zparseopts examples, please let me
know. Google was not very much help.

--001a113f8fd2bacdf4050d539a05--