minirepl

#!/bin/bash

autocompletion () {
  local pre word rest i list expanded
  pre=${READLINE_LINE:0:READLINE_POINT}
  word=${pre##* }
  rest=${pre%"$word"}
  list=(correct horse battery staple startup hotel)                 # possible completions

  (( ! ${#word} )) && return
  for i in "${list[@]}"; do
    [[ ${#word} -lt ${#i} && $i = "$word"* ]] && expanded+=("$i")   # found a match
  done

  case ${#expanded[@]} in
    0) ;;
    1) READLINE_LINE=$rest$expanded${READLINE_LINE:READLINE_POINT}  # replace
       (( READLINE_POINT += ${#expanded} - ${#word} )) ;;           # move cursor
    *) printf "%s\\n" "${expanded[@]}" --
  esac
}

set -o emacs
bind -x '"\C-i":autocompletion'

while read -ep "> " ; do
  [[ $REPLY ]] || continue                                          # ignore empty lines

  if hist=$(history -p "$REPLY") 2>/dev/null; then                  # can perform history expansion?
    REPLY=$hist                                                     # if so, ok let's do it
  fi

  history -s -- "$REPLY"                                            # add this line to history
  printf "your line was: %s\n" "$REPLY"
done