How to delegate to another command's completion?

[fredrikfoss]

Hi,

How can I make a completion function reuse the existing completion logic for another command? My usecase is to have myprg g <tab> offer the same completions as git <tab>. My attempts are the following, but none of them produced any completions (unless I used "git" instead of "g".)

_comp_cmd_myprg() {
	local cur prev words cword comp_args
	_comp_initialize -- "$@" || return

	if [[ $cword -eq 2 && $prev == 'g' ]]; then
		#1
		cword=git
		_comp_command_offset 1

		#2
		words[1]=git
		_comp_command_offset 1

		#3
		COMP_WORDS[1]=git
		_comp_command_offset 1

		#4
		COMP_WORDS=("${COMP_WORDS[0]}" "git" "${COMP_WORDS[@]:2}")
		_comp_command_offset 1
	fi
} &&
	complete -F _comp_cmd_myprg