Support some way of checking array length

[estan]

I know this may be frowned upon, but in the JS implementation you can do

{{#items.length}}
    stuff rendered if items is non-empty
{{/items.length}}

Several other implementations have some similar way of checking this.

This is not really spec compliant, and I know Mustache is supposed to be logic-less, but it's very useful if you want to render a block only if an array is non empty. A prime example is if you want to render a HTML table, but only if it would contain any rows, then you could do:

{{#items.length}}
    <h2>Items</h2>
    <table>
        <tbody>
            {{#items}}
                <tr><td>{{id}}</td><td>{{name}}</td></tr>
            {{/items}}
        </tbody>
    </table>
{{/items.length}}

You don't want to render the enclosing <table><tbody>...</tbody></table> if the table would be empty.

This is not possible without a .length-type of feature, short of wrapping your list under an ugly dummy key, e.g:

data = { 'items_list' : { 'items' : ["Item 1", "Item 2", "etc"] } };

and then check for items_list, or by introducing a has_items alongside items.

It would be very nice if qt-mustache could support .length or similar, for those of us who know we'll be using qt-mustache and don't care too much about interoperability.

[robertknight]

If there is a widely supported pattern across several common Mustache implementations I think I would be OK with supporting this. See #21 (comment) for notes on where to implement it.

[estan]

Alright, as far as I know, there isn't really :/ I understand your reservations and will close this for now. Lets hope the Mustache spec is updated some day to include such a feature. For now I'll use a has_xyz field.