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class Pather
attr_accessor :current_path
def initialize
@assets = {}
@current_path = []
end
def add asset_id, path
@assets[asset_id] = @current_path + path.split('/')
end
def path_to asset_id
other_path = @assets[asset_id]
find_path_between @current_path, other_path
end
def find_path_between from, to
from, to = drop_common_prefix from, to
path = ('../' * from.length) + to.join('/')
end
def drop_common_prefix path1, path2
common_prefix_length = path1.zip(path2).take_while do |(segment1, segment2)|
segment1 == segment2
end.length
return path1[common_prefix_length..], path2[common_prefix_length..]
end
def cd path
path.split('/').each do |segment|
if segment == '..'
@current_path.pop
else
@current_path.push segment
end
end
end
end
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