module Sprockets::Trail

# File lib/sprockets/trail.rb, line 38
def append_path(path)
  expire_index!
  @trail.append_path(path)
end

Append a ‘path` to the `paths` list.

Paths at the beginning of the ‘Array` have a higher priority.

# File lib/sprockets/trail.rb, line 48
def clear_paths
  expire_index!
  @trail.paths.dup.each { |path| @trail.remove_path(path) }
end

Clear all paths and start fresh.

There is no mechanism for reordering paths, so its best to completely wipe the paths list and reappend them in the order you want.

# File lib/sprockets/trail.rb, line 59
def extensions
  trail.extensions.dup
end

Returns an ‘Array` of extensions.

These extensions maybe omitted from logical path searches.

# => [".js", ".css", ".coffee", ".sass", ...]

# File lib/sprockets/trail.rb, line 23
def paths
  trail.paths.dup
end

Returns an ‘Array` of path `String`s.

These paths will be used for asset logical path lookups.

Note that a copy of the ‘Array` is returned so mutating will have no affect on the environment. See `append_path`, `prepend_path`, and `clear_paths`.

# File lib/sprockets/trail.rb, line 30
def prepend_path(path)
  expire_index!
  @trail.prepend_path(path)
end

Prepend a ‘path` to the `paths` list.

Paths at the end of the ‘Array` have the least priority.

# File lib/sprockets/trail.rb, line 70
def resolve(logical_path, options = {})
  # If a block is given, preform an iterable search
  if block_given?
    args = attributes_for(logical_path).search_paths + [options]
    trail.find(*args) do |path|
      yield Pathname.new(path)
    end
  else
    resolve(logical_path, options) do |pathname|
      return pathname
    end
    raise FileNotFound, "couldn't find file '#{logical_path}'"
  end
end

Finds the expanded real path for a given logical path by searching the environment’s paths.

resolve("application.js")
# => "/path/to/app/javascripts/application.js.coffee"

A ‘FileNotFound` exception is raised if the file does not exist.

# File lib/sprockets/trail.rb, line 12
def root
  trail.root.dup
end

Returns ‘Environment` root.

All relative paths are expanded with root as its base. To be useful set this to your applications root directory. (‘Rails.root`)