vim :terminal find-file

find-file

#!/bin/bash

if [[ $# -eq 0 ]] ; then
    echo 'find-file: no file name specified'
    exit 1
fi

echo -en "\033]51;vim:$1\007"

terminalfindfile.vim

function! TerminalFindFileCB(chan, msg)
  let l:file = matchstr(a:msg, "\<esc>]51;vim:".'\zs.\{-}\ze[\x7\x1b]')
  if empty(l:file) | return | endif
  let l:file = fnameescape(l:file)

  if filereadable(l:file)
    execute 'drop' l:file
  else
    echoerr 'terminalfindfile:' l:file 'is not readable'
  endif
endfunction

" use the first :terminal found
let s:term_buf = get(term_list(), 0, -1)

if s:term_buf > 0
  call ch_setoptions(job_getchannel(term_getjob(s:term_buf)),
        \ {"callback": function("TerminalFindFileCB")})
else
  echoerr 'terminalfindfile: no terminal buffer'
endif

Warning: this is a proof of concept.

Usage: source the script (modify if necessary). Then within vim :terminal type

$ find-file filename.txt