Repository: spf13/cobra
File: bash_completionsV2.go (Go)

Code before:
    # to prepare the arguments properly
    if declare -F _init_completion >/dev/null 2>&1; then
        _init_completion -n =: || return
    else
        __%[1]s_init_completion -n =: || return
    fi

    __%[1]s_debug
    __%[1]s_debug "========= starting completion logic =========="
    __%[1]s_debug "cur is ${cur}, words[*] is ${words[*]}, #words[@] is ${#words[@]}, cword is $cword"

    # The user could have moved the cursor backwards on the command-line.
    # We need to trigger completion from the $cword location, so we need
    # to truncate the command-line ($words) up to the $cword location.
    words=("${words[@]:0:$cword+1}")
    __%[1]s_debug "Truncated words[*]: ${words[*]},"

    local out directive
    __%[1]s_get_completion_results
    __%[1]s_process_completion_results
}

if [[ $(type -t compopt) = "builtin" ]]; then
    complete -o default -F __start_%[1]s %[1]s
else
    complete -F __start_%[1]s %[1]s
fi

# ex: ts=4 sw=4 et filetype=sh
`, name, compCmd,
		ShellCompDirectiveError, ShellCompDirectiveNoSpace, ShellCompDirectiveNoFileComp,
		ShellCompDirectiveFilterFileExt, ShellCompDirectiveFilterDirs, ShellCompDirectiveKeepOrder,
		activeHelpMarker))
}

// GenBashCompletionFileV2 generates Bash completion version 2.
func (c *Command) GenBashCompletionFileV2(filename string, includeDesc bool) error {
	outFile, err := os.Create(filename)
	if err != nil {
		return err
	}
	defer outFile.Close()

	return c.GenBashCompletionV2(outFile, includeDesc)
}

// GenBashCompletionV2 generates Bash completion file version 2
// and writes it to the passed writer.
func (c *Command) GenBashCompletionV2(w io.Writer, includeDesc bool) error {
	return c.genBashCompletion(w, includeDesc)
}

Review comment (suggestion):
So I think we got our signals crossed 😆 
It is the above line that needs to be reverted as it is addressing the bash v3 case.

It may not be clear but `bash_completion.go` is Cobra's legacy bash completion solution, which is still used by many projects.  `bash_completionV2.go` is a new solution some projects have migrated to.  But both solution support bash v3 and bash v4/v5.

We actively maintain `bash_completionV2.go` but are open to changes in `bash_completion.go` if the contributor feels it is important.

Code after:
    local cur prev words cword split

    COMPREPLY=()

    # Call _init_completion from the bash-completion package
    # to prepare the arguments properly
    if declare -F _init_completion >/dev/null 2>&1; then
        _init_completion -n =: || return
    else
        __%[1]s_init_completion -n =: || return
    fi

    __%[1]s_debug
    __%[1]s_debug "========= starting completion logic =========="
    __%[1]s_debug "cur is ${cur}, words[*] is ${words[*]}, #words[@] is ${#words[@]}, cword is $cword"

    # The user could have moved the cursor backwards on the command-line.
    # We need to trigger completion from the $cword location, so we need
    # to truncate the command-line ($words) up to the $cword location.
    words=("${words[@]:0:$cword+1}")
    __%[1]s_debug "Truncated words[*]: ${words[*]},"

    local out directive
    __%[1]s_get_completion_results
    __%[1]s_process_completion_results
}

if [[ $(type -t compopt) = "builtin" ]]; then
    complete -o default -F __start_%[1]s %[1]s
else
    complete -o default -o nospace -F __start_%[1]s %[1]s
fi

# ex: ts=4 sw=4 et filetype=sh
`, name, compCmd,
		ShellCompDirectiveError, ShellCompDirectiveNoSpace, ShellCompDirectiveNoFileComp,
		ShellCompDirectiveFilterFileExt, ShellCompDirectiveFilterDirs, ShellCompDirectiveKeepOrder,
		activeHelpMarker))
}

// GenBashCompletionFileV2 generates Bash completion version 2.
func (c *Command) GenBashCompletionFileV2(filename string, includeDesc bool) error {
	outFile, err := os.Create(filename)
	if err != nil {
		return err
	}
	defer outFile.Close()

	return c.GenBashCompletionV2(outFile, includeDesc)
}