Could you explain, give an use example? If I understand correctly, for internationalisation, couldn't you just pass an object with a different set of strings?

This isnt just targeted at internationalization is it? As it enables extensibility it resembles a simple plugin system IMO. Could it be something to work on related to plugins / pragmas as mentioned in #406?

@dasilvacontin
According to this pull-request:

var translationsHash = {
    firstName: "First name",
    lastName: "Last name"
};

Mustache.addCustomTag('i', function(contents, value) {
    return translationsHash[contents];
});

Template may look like this:

<div class="user">
    <div class="user-firstName">{{i lastName}}: {{firstName}}</div>
    <div class="user-lastName">{{i firstName}}: {{lastName}}</div>
</div>

If we use this approach, we don't need to pass strings at all.

@phillipj
Actually Handlebars has this feature (helpers), so we switched to it. Now I'm not sure, that mustache.js really need custom tags.

@zverev, thanks for the template example.

Couldn't you just pass a different data/model object or a modified one to Mustache.render?

@dasilvacontin
Yes, I certainly could. But this method allows to avoid it. Also in my case I have some global translations, that are used by multiple components (e.g. button titles such as 'ok', 'cancel'). Without 'i' tag I would have to pass them manually.
Sorry for the late reply.

No worries. I see what you mean.

We certainly need some kind of Plugin API. Having a Plugin API would make solving this issue something trivial. I think we should discuss how we approach adding a Plugin API in a separate issue.