tpl/collections: Allow querify to accept a map argument

[jmooring]

The collections.Querify template function accepts either of the following argument forms:

{{ collections.Querify "a" 1 "b" 2 }}         --> a=1&b=2
{{ collections.Querify (slice "a" 1 "b" 2) }} --> a=1&b=2

But it would convenient if we could do:

{{ collections.Querify (dict "a" 1 "b" 2) }}

For example, in our embedded youtube shortcode we:

1. Build a map of parameters

2. Convert the map into a slice with this construct:

   {{ range $k, $v := $params }}
     {{ $s = $s | append $k }}
     {{ $s = $s | append $v }}
   {{ end }}
   

3. Pass the slice to collections.Querify

It would be more elegant if we could remove step 2 above.

[bep]

{{ collections.Querify (dict "a" 1 "b" 2) }}

We need to remember to sort the keys.

[jmooring]

We need to remember to sort the keys.

The existing code calls Encode before returning the result.

Encode encodes the values into “URL encoded” form ("bar=baz&foo=quux") sorted by key.

So unless I'm missing something, I think that covers the sort.

[bep]

So unless I'm missing something, I think that covers the sort.

You're right, I didn't look at the code.