From: Sebastian Gniazdowski <psprint@zdharma.org>
To: zsh-workers@zsh.org
Subject: Feature request – substitutions similar to +, -, :+, :-
Date: Sat, 18 Nov 2017 19:05:25 +0100 [thread overview]
Message-ID: <etPan.5a107666.74b42c6c.137@zdharma.org> (raw)
Hello
I constantly save lines of code by using +,-,:+,:- substitutions. Example: there's "$theme[button-color]", which can be empty, so no need for $reset_color. Solution:
button_txt="$theme[button-color]My Button${theme[button-color]:+$reset_color}"
Sometimes I was needing similar substitution but checking for concrete value. So, substitute "abc" if value is "xyz", etc. However it's a hard time to find a place in the substitution where the value could be specified. However, a step in right direction would be boolean test for 1 or 0, or maybe like in zstyle also for true/false, yes/no.
So this would be possible:
echo "I'm ${${theme[use-name]:&Patrick}:-a subscriber}, hello."
:& would substitute on "1", not substitute otherwise, so also not for "". Analogically :^ would substitute on "0". Those substitutions would definitely often save lines of code.
--
Sebastian Gniazdowski
psprint /at/ zdharma.org
next reply other threads:[~2017-11-18 18:05 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-18 18:05 Sebastian Gniazdowski [this message]
2017-11-18 18:22 ` Sebastian Gniazdowski
2017-11-18 18:46 ` Bart Schaefer
[not found] ` <etPan.5a10805d.57d72d7c.137@AirmailxGenerated.am>
2017-11-25 11:15 ` Sebastian Gniazdowski
2017-12-03 9:11 ` Ternary expression in Zsh (was: Feature request – substitutions similar to +, -, :+, :-) Sebastian Gniazdowski
2017-12-05 6:55 ` Stephane Chazelas
2017-12-05 8:06 ` Tom M.
2017-12-05 9:04 ` Bart Schaefer
2017-12-05 8:24 ` Sebastian Gniazdowski
2017-12-05 9:05 ` Bart Schaefer
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=etPan.5a107666.74b42c6c.137@zdharma.org \
--to=psprint@zdharma.org \
--cc=zsh-workers@zsh.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://git.vuxu.org/mirror/zsh/
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).