Shell-function to give current word of Bash readline, i.e. "read -e". To be used with key-binding for custom TAB completion

readline_cword.bash

### Source me
readline_cword(){
  # Gives current word of Bash readline, viz. the word where the insertion point/cursor is currently at
  set -- ${READLINE_LINE}
  local length=${#1}
  while ((length < READLINE_POINT)); do
    shift
    length+=${#1}
  done
  echo -n "${1}"
}; export -f readline_cword

# Use case:
# Custom TAB completion:
# Single TAB: bind -x '"\t":custom__completion_function "$(readline_cword)"'
# Double TAB: bind -x '"\t\t":custom__list_suggestions_function "$(readline_cword)"'