NOTE: 本期视频宣布作废，改进版在第24期
Resources:
unzip vim-fuzzyfinder.zip -d ~/.vim
unzip vim-l9.zip -d ~/.vim
h fuf
helptags ~/.vim/doc/
FulCoverageFile
FulCoverageFile!
let g:fuf_coveragefile_globPatterns = ['**/*.erb']
map ,, :FufCoverageFile <cr>
let g:fuf_coveragefile_globPatterns = ['**/*.erb']
h g:fuf_coveragefile_globPatterns