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

See toolshed/organising#644

Partial revert of 1f8662cd95

scripts/autocomplete/zsh

@@ -1,26 +1,23 @@
-#compdef abra
-compdef _abra abra
+#compdef $PROG
 
-# https://github.com/urfave/cli/blob/main/autocomplete/zsh_autocomplete
+_cli_zsh_autocomplete() {
 
-_abra() {
-	local -a opts
-	local cur
-	cur=${words[-1]}
-	if [[ "$cur" == "-"* ]]; then
-		opts=("${(@f)$(${words[@]:0:#words[@]-1} ${cur} --generate-shell-completion)}")
-	else
-		opts=("${(@f)$(${words[@]:0:#words[@]-1} --generate-shell-completion)}")
-	fi
+  local -a opts
+  local cur
+  cur=${words[-1]}
+  if [[ "$cur" == "-"* ]]; then
+    opts=("${(@f)$(_CLI_ZSH_AUTOCOMPLETE_HACK=1 ${words[@]:0:#words[@]-1} ${cur} --generate-bash-completion)}")
+  else
+    opts=("${(@f)$(_CLI_ZSH_AUTOCOMPLETE_HACK=1 ${words[@]:0:#words[@]-1} --generate-bash-completion)}")
+  fi
 
-	if [[ "${opts[1]}" != "" ]]; then
-		_describe 'values' opts
-	else
-		_files
-	fi
+  if [[ "${opts[1]}" != "" ]]; then
+    _describe 'values' opts
+  else
+    _files
+  fi
+
+  return
 }
 
-# don't run the completion function when being source-ed or eval-ed
-if [ "$funcstack[1]" = "_abra" ]; then
-	_abra
-fi
+compdef _cli_zsh_autocomplete $PROG