Any equivalence to Dust's @sep-arator concept?

[mjudd]

Dust.js (at least LinkedIn's version) has a useful {@sep} capability to denote what "separator" should be used when generating list entries. It's akin to the "join" operator for an array.

Dust:  {#links}<a href='/nodes/{href}'>{name}</a>{@sep}, {/sep}{/links}

I can't quite figure out the best way to do this in coffeecup. It's easy to generate a list of links:

a href:link.href, link.name for link in links

but producing them as a comma-separated list is more problematic.

Since coffeecup is "generating" results to a special buffer rather than "returning" results to coffeescript, I can't use a normal "join" operator.

I'm hoping there's a nifty mechanism to do this without resorting to index counting and emitting a text ', ' for all-but-the-last list item.

Any solutions to this? Can I encapsulate this sort of functionality in a helper somehow? Am I overlooking something trivial?

[mjudd]

Well, it was easy enough to write a helper function

forEachWithSep: (list, itemFn, sep) -> 
  for idx, item of list
    itemFn item
    if idx < list.length - 1
      switch typeof sep
        when 'string'
          text sep
         when 'function'
           sep()

that I could then call generically

forEachWithSep links,
  (link) -> a href:"/#{link.path}", link.name ## Note: arbitrary item handler function
  ", "

Any other tactics come to mind?