Extend dynamically generated selectors (summary).

[seven-phases-max]

This ticket is to replace (mostly for the sake of clear minimal examples):
#1325
#1539
#1597

It includes two distinct sub-features that require internal selector re-parsing:

---

[1]. Extend interpolated selector:

@var: a;

@{var} {
  color: red;
}

b:extend(a) {}

Expected result:

a, b {
  color: red;
}

---

[2]. Extend concatenated selector:

a {
  &b {
    color: blue;
  }
}

c:extend(ab) {}

Expected result:

ab, c {
  color: blue;
}

---

Related but pretty much independent feature of using a variable as an extend argument,
i.e. :extend(@{var}), is clearly specified in #1485 and not included here.

[seven-phases-max]

Strictly speaking [2] is not even a "dynamically generated selector" but it's almost always mentioned with [1] examples so they are merged here for more easy tracking. (Though these two sub-features don't have to be implemented simultaneously).

[awcross]

+1

[Pestov]

When are this feature will done? It's great and very useful.

[pcwinters]

I can imagine that this requires fundamental changes to some internals, but it should really be higher priority. 👍

[zephraph]

Do we have an idea of what needs to be changed to support this? I'm more than willing to help out.

[seven-phases-max]

It's just about adding the corresponding modifications to the extend implementation.

[zephraph]

Also, what about #1485? You mentioned it's a separate feature, but would the changes needed to make this work cover that use case as well?

[seven-phases-max]

Honestly I'm not sure I understand the question. These are really three separate features from both usage and development perspective (neither one depends on the other and there's just a little overlapping between them from a technical point of view).

[zephraph]

Ahh, I see. I assumed that the two issues would share the same technical solution. Thanks for clearing that up.

[matthew-dean]

Is example 2 correctly written? I'm not sure why @var: a exists in that example.

[seven-phases-max]

I'm not sure why @var: a exists in that example.

Indeed. Hello copy-paste. Fixed now.

[zxcabs]

🆙

[DennisJohnsen]

Can't wait for this feature to each LESS 3 ;)

[guillaume-duchemin]

Hello everyone !
I can't find any news about this issue... Is it fixed ??

[matthew-dean]

@guillaume-duchemin @seven-phases-max

#1 in the example now works as of the current release, #2 does not. You can see them here: http://lesscss.org/less-preview/

[matthew-dean]

Since this is partially fixed and #1597 contains the part that is not addressed, I'm going to close this and re-open #1597.