Extension for the tartan library that allows to flexibly compare tartans by threadcounts and/or palettes.
After including this extension to the project, tartan.fingerprint will be
available. Use tartan.fingerprint.create(string sett, object defaultColors)
to create a fingerprint of tartan; returned value is opaque and should
be passed to comparison function. tartan.fingerprint.compare(left, right)
takes two fingerprints and returns several numbers: distance by sett, distance
by palette and aggregated value. Each of that numbers is not a kind of absolute
measure, but rather a value that should be used to decide which of tartans from
some list is closer to searched one. For example, refer to helper function
tartan.fingerprint.search(items, fingerprint) which accepts a list of object
(each of them should have a fingerprint field), and returns an ordered subset
of items that are the best matching to provided fingerprint.