Echo Bash Alias beneath cursor

gistfile1.vim

" Echo Bash Alias beneath cursor
" Barry Arthur, July 2015

let aliases = {}
for a in split(system('/bin/bash -ic alias'), '\n')
  let [k,v] = matchlist(a, 'alias \(\S\+\)=\(.*\)')[1:2]
  call extend(aliases, {k : v})
endfor

function! EchoAlias()
  let w = expand('<cword>')
  if has_key(g:aliases, w)
    echom 'alias ' . w . '=' . g:aliases[w]
  endif
endfunction

augroup EchoAlias
  au!
  au CursorMoved,CursorHold * call EchoAlias()
augroup END