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Contents
module Nanoc::Helpers
# Provides support for breadcrumbs, which allow the user to go up in the
# page hierarchy.
module Breadcrumbs
class CannotGetBreadcrumbsForNonLegacyItem < Nanoc::Int::Errors::Generic
def initialize(identifier)
super("You cannot build a breadcrumbs trail for an item that has a “full” identifier (#{identifier}). Doing so is only possible for items that have a legacy identifier.")
end
end
# Creates a breadcrumb trail leading from the current item to its parent,
# to its parent’s parent, etc, until the root item is reached. This
# function does not require that each intermediate item exist; for
# example, if there is no `/foo/` item, breadcrumbs for a `/foo/bar/` item
# will contain a `nil` element.
#
# @return [Array] The breadcrumbs, starting with the root item and ending
# with the item itself
def breadcrumbs_trail
unless @item.identifier.legacy?
raise CannotGetBreadcrumbsForNonLegacyItem.new(@item.identifier)
end
trail = []
idx_start = 0
loop do
idx = @item.identifier.to_s.index('/', idx_start)
break if idx.nil?
idx_start = idx + 1
identifier = @item.identifier.to_s[0..idx]
trail << @items[identifier]
end
trail
end
end
end
Version data entries
12 entries across 12 versions & 1 rubygems