GNU bug report logs - #29351
Sed missing eval command

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: "Aeron.E. Wang" <aeron.e.wang <at> gmail.com>
To: "bug-sed <at> gnu.org" <bug-sed <at> gnu.org>
Subject: Sed missing eval command
Date: Sat, 18 Nov 2017 17:21:34 +0000

[Message part 1 (text/plain, inline)]

Hello,

I use sed a lot. To make it more powerful, please add eval command.

With e and s///e, we can somehow eval shell command, isn’t nicer and easier
to eval sed syntax itself?

I would consider this as a great meta programming feature adding to sed.

Thanks.

Aeron Wang

[Message part 2 (text/html, inline)]

Message #8 received at 29351 <at> debbugs.gnu.org (full text, mbox):

From: Assaf Gordon <assafgordon <at> gmail.com>
To: "Aeron.E. Wang" <aeron.e.wang <at> gmail.com>, 29351 <at> debbugs.gnu.org
Subject: Re: bug#29351: Sed missing eval command
Date: Sat, 18 Nov 2017 12:57:23 -0700

Hello,

On 2017-11-18 10:21 AM, Aeron.E. Wang wrote:
> I use sed a lot. To make it more powerful, please add eval command.
> 
> With e and s///e, we can somehow eval shell command, isn’t nicer and easier
> to eval sed syntax itself?

It would be easier to think of the "e" command as "execute" not "eval" -
it executes the command given (using the shell), and then reads the
output of the command and inserts it into the pattern space.

sed itself does not evaluate the command (or parses, or checks for valid 
syntax). It passes the command as-is to the shell.

> I would consider this as a great meta programming feature adding to sed.

This is certainly not a trivial feature, can you elaborate
and provide some concrete use cases where such feature would be useful?

regards,
 - assaf

Message #11 received at 29351 <at> debbugs.gnu.org (full text, mbox):

From: Assaf Gordon <assafgordon <at> gmail.com>
To: "Aeron.E. Wang" <aeron.e.wang <at> gmail.com>, 29351 <at> debbugs.gnu.org
Subject: Re: bug#29351: Sed missing eval command
Date: Tue, 9 Oct 2018 05:29:19 -0600

severity 29351 wishlist
tags 29351 moreinfo
close
stop

With no further comments for now, I'm marking this as "wishlist" item
and closing it. Further discussion can continue by replying to this
thread.

-assaf

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