text/template: add support for variable overwrite (= not :=)

[bep]

Given this template snippet:

{{ $v := "init" }}
{{ if true }}
    {{ $v := "changed" }}
{{ end }}
v: {{ $v }} {{/* => init */}}

The inner $v is not visible on the outside. := does hint that this is a new variable.

Trying

{{ $v = "changed" }}

Gives

unexpected "=" in operand; missing space?

This is probably as designed, but it would be really nice if there was a way to get the changed $v outside of the conditional.

This is the #1 template question we get over at Hugo (https://github.com/spf13/hugo). We have added a hack to workaround it for now ...

[qd3v]

@bep can you please point where this hack located? Searched docs several times, but no luck...
Thanks!

[bep]

@vanburg http://gohugo.io/extras/scratch/

[qd3v]

@bep wow, how can I missed it?! Thanks!

[jupy]

@bep, could you explain, what is your workaround? How I can assign to $v variable different values depending on condition. tx.

[bep]

@jupy ask here: http://discuss.gohugo.io/ This is the GO issue tracker.

[withnale]

Any update on this issue? It's such a simple issue that would make working with templates so much easier.

[JasonTheAdams]

Wow, I'm amazed that it's been almost two years and this still doesn't work? I thought I was going crazy, not realizing it was a limitation — it seems so obvious. Looking forward to this!

[sinnlosername]

Anything new?^^