+typeset -gaU GRML_PERSISTENT_DIRSTACK
+function grml_dirstack_filter() {
+ local -a exclude
+ local filter entry
+ if zstyle -s ':grml:chpwd:dirstack' filter filter; then
+ $filter $1 && return 0
+ fi
+ if zstyle -a ':grml:chpwd:dirstack' exclude exclude; then
+ for entry in "${exclude[@]}"; do
+ [[ $1 == ${~entry} ]] && return 0
+ done
+ fi
+ return 1
+}
+
+chpwd() {
+ (( $DIRSTACKSIZE <= 0 )) && return
+ [[ -z $DIRSTACKFILE ]] && return
+ grml_dirstack_filter $PWD && return
+ GRML_PERSISTENT_DIRSTACK=(
+ $PWD "${(@)GRML_PERSISTENT_DIRSTACK[1,$DIRSTACKSIZE]}"
+ )
+ builtin print -l ${GRML_PERSISTENT_DIRSTACK} >! ${DIRSTACKFILE}
+}
+