How to enable default file completion in bash

Question

Say I have a command named \"foo\" that takes one argument (either \"encrypt\" or \"decrypt\") and then a list of files. I want to write a bash completion script that helps wit

Answer 1

I know this is a little late, but I have found a solution here: https://stackoverflow.com/a/19062943/108105

Basically, you use complete -o bashdefault -o default, and when you want to revert to the default bash completion you set COMPREPLY=(). Here's an example:

complete -o bashdefault -o default -F _foo foo
_foo() {
    local cur=${COMP_WORDS[COMP_CWORD]}
    if (( $COMP_CWORD == 1 )); then
        COMPREPLY=( $(compgen -W 'encrypt decrypt' -- "$cur") )
    else
        COMPREPLY=()
    fi
}