$ go get github.com/walle/lll/...

usage: lll [--maxlength MAXLENGTH] [--tabwidth TABWIDTH] [--goonly] [--skiplist SKIPLIST] [--vendor] [--files] [--exclude EXCLUDE] [INPUT [INPUT ...]]
positional arguments:
  input
options:
  --maxlength MAXLENGTH, -l MAXLENGTH
                         max line length to check for [default: 80]
  --tabwidth TABWIDTH, -w TABWIDTH
                         tab width in spaces [default: 1]
  --goonly, -g           only check .go files
  --skiplist SKIPLIST, -s SKIPLIST
                         list of dirs to skip [default: [.git vendor]]
  --vendor               check files in vendor directory
  --files                read file names from stdin one at each line
  --exclude EXCLUDE, -e EXCLUDE
                         exclude lines that matches this regex
  --help, -h             display this help and exit

$ go test -cover