fix: use old auto-completion for 0.9.x compat

See toolshed/organising#644

Partial revert of 1f8662cd95

scripts/autocomplete/bash

@@ -2,31 +2,17 @@
 
 : ${PROG:=$(basename ${BASH_SOURCE})}
 
-# Macs have bash3 for which the bash-completion package doesn't include
-# _init_completion. This is a minimal version of that function.
-_cli_init_completion() {
-  COMPREPLY=()
-  _get_comp_words_by_ref "$@" cur prev words cword
-}
-
 _cli_bash_autocomplete() {
   if [[ "${COMP_WORDS[0]}" != "source" ]]; then
-    local cur opts base words
+    local cur opts base
     COMPREPLY=()
     cur="${COMP_WORDS[COMP_CWORD]}"
-    if declare -F _init_completion >/dev/null 2>&1; then
-      _init_completion -n "=:" || return
-    else
-      _cli_init_completion -n "=:" || return
-    fi
-    words=("${words[@]:0:$cword}")
     if [[ "$cur" == "-"* ]]; then
-      requestComp="${words[*]} ${cur} --generate-shell-completion"
+      opts=$( ${COMP_WORDS[@]:0:$COMP_CWORD} ${cur} --generate-bash-completion )
     else
-      requestComp="${words[*]} --generate-shell-completion"
+      opts=$( ${COMP_WORDS[@]:0:$COMP_CWORD} --generate-bash-completion )
     fi
-    opts=$(eval "${requestComp}" 2>/dev/null)
-    COMPREPLY=($(compgen -W "${opts}" -- ${cur}))
+    COMPREPLY=( $(compgen -W "${opts}" -- ${cur}) )
     return 0
   fi
 }