buildTreeChart.ls

buildTreeChart = (tags) ->
  tag-index = {}

  # Build tag index
  for tag in tags
    if tag-index[tag]
      tag-index[tag] += 1
    else
      tag-index[tag] = 1

  # Sort index
  sortable = []
  for tag of tag-index
    sortable.push [tag, tag-index[tag]]

  sortable.sort (a, b) ->
    b[1] - a[1]

  tree-chart = []
  limit = void

  if sortable.length > 10
    limit = 9
  else
    limit = sortable.length - 1

  # Construct proper object for D3 tree chart
  for tag in sortable[0 to limit]
    tree-chart.push {name: tag[0], size: tag[1]}

  tree-chart