=== modified file 'common.zsh'
--- common.zsh	2017-12-06 18:47:58 +0000
+++ common.zsh	2017-12-06 17:55:30 +0000
@@ -109,17 +109,12 @@
 	done
 }
 
-parse-previous() {
-	typeset -g previous_parsed has_previous
-	typeset -gA previous
+is-unchanged() {
+	local -A previous
 	local arg
 
-	(($previous_parsed)) && return
-
 	if ! [[ -f $FILE ]]; then
 		info "changed: missing $FILE"
-		previous_parsed=1
-		has_previous=0
 		return 1
 	fi
 
@@ -133,15 +128,6 @@
 		previous[${arg%%=*}]=${arg#*=}
 	done
 
-	previous_parsed=1
-	has_previous=1
-}
-
-is-unchanged() {
-	local arg
-
-	parse-previous
-
 	if [[ "${(ko)vars}" != "${(ko)previous}" ]]; then
 		info "changed: different variables"
 		info "now: ${(ko)vars}"