What would you expect to get when you have a tag without = in it?
"myvar" string => "value", meta => { "inventory", "attribute_name=my
special inventory thing" };
"inventory_tags" slist => getvariablemetatags("myvar", "inventory");
An empty list?
A list with a single element of empty string? { "" }
Skip defining the variable? <- my preference
I can see this being useful.
On Wednesday, July 13, 2016 at 5:07:05 AM UTC-5, Ted Zlatanov wrote:
>
> On Wed, 13 Jul 2016 08:35:04 +0200 Kristian Amlie <[email protected]
> <javascript:>> wrote:
>
> KA> On 12/07/16 18:08, Ted Zlatanov wrote:
> >> Right now, getclassmetatags("myclass") and getvariablemetatags("myvar")
> >> return an slist of all the tags for their respective class or variable.
> >>
> >> In 3.9.0, I found myself needing a specific tag value instead of all of
> >> them, so I was doing
> >>
> >> regex_replace(nth(grep("^foo=.*", getclassmetatags("myclass")), 0),
> "^foo=", "", "T")
> >>
> >> to get the value of the "foo=bar" tag of "myclass". So I would love to
> >> have an optional second argument getclassmetatags("myclass", "foo") and
> >> getvariablemetatags("myvar", "foo") that give me a slist of the
> specific
> >> tag values, removing the key. What do you think? It would be backwards
> >> compatible and fairly easy to implement.
>
> KA> Would it need to be an slist? If you ask for a specific tag you'll get
> KA> just one value, no? Or do you mean that it should be an expression?
>
> You'd get an slist, because you can have meta => { "foo=1", "foo=2" } so
> the function signature won't change.
>
> KA> I guess this makes sense, but just out of curiosity, can you share
> some
> KA> more about why you needed this, if it's not too secret? :-)
>
> It was for https://github.com/cfengine/masterfiles/pull/766 but I think
> it's a generally useful extension.
>
> Ted
>
>
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