Unite.vim sorter for burke/matcher (provides Command-T fuzzy matching for Unite)

sorter_burkematcher.vim

" Paste this into your .vimrc.
" It's very janky but hopefully easy to tweak for your own purposes.
" If you want to make this into a real plugin, be my guest.

" To use, put this in your .vimrc:
" call unite#custom#source('<source name>', 'sorters', 'sorter_burkematcher')

python << endpython
import vim
import subprocess

def rank_files():
  candidates = vim.eval('a:candidates')
  input_str = vim.eval('a:context.input')

  candidate_filenames = '\n'.join(c['word'] for c in candidates)

  p = subprocess.Popen([ 'matcher', '--limit', '100', input_str ], stdin=subprocess.PIPE, stdout=subprocess.PIPE)
  p.stdin.write(candidate_filenames)
  ranked_filenames = p.communicate()[0].split("\n")
  p.stdin.close()

  return dict([ (v, i) for i, v in enumerate(ranked_filenames) ])

def score(ranks_by_filename):
  worst_rank = len(ranks_by_filename)
  c = vim.eval('candidate')
  cost = ranks_by_filename.get(c['word'], worst_rank)
  vim.command('let candidate.filter__cost = %d' % cost)
endpython

let sorter_burkematcher = { 'name': 'sorter_burkematcher' }
function! sorter_burkematcher.filter(candidates, context)
  if a:context.input == '' || !has('float') || empty(a:candidates)
    return a:candidates
  endif

  python ranks = rank_files()

  for candidate in a:candidates
    python score(ranks)
  endfor

  return unite#util#sort_by(a:candidates, 'v:val.filter__cost')
endfunction
call unite#define_filter(sorter_burkematcher)