Insert #include for a C declaration in Vim

c_insert_include_for_tag.vim

"
" CInsertIncludeForTag
"
" Search for the filename containing the prototype of the function or
" type definition for a C tag, and insert '#include <filename>' in the
" current file where there is the marker `i`.
"

function! CInsertIncludeForTag()
  redir => l:matches
  echo (":tselect " . expand("<cword>"))
  silent execute (":tselect " . expand("<cword>"))
  redir END
  for l:line in split(l:matches, "\n")
      let l:fields = filter(split(l:line, " "), 'v:val != ""')
      if len(l:fields) >= 5
        if l:fields[2] == 'p' || l:fields[2] == 't'
          call append(line("'i"), "#include <" . l:fields[4] . ">")
          break
        endif
      endif
  endfor
endfunction

command! CInsertIncludeForTag call CInsertIncludeForTag()