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-rw-r--r--Functions/Calendar/calendar_edit11
1 files changed, 10 insertions, 1 deletions
diff --git a/Functions/Calendar/calendar_edit b/Functions/Calendar/calendar_edit
index e31decb76..e3ac5c39b 100644
--- a/Functions/Calendar/calendar_edit
+++ b/Functions/Calendar/calendar_edit
@@ -10,12 +10,21 @@ done
 
 zstyle -s ':datetime:calendar:' calendar-file calendar || calendar=~/calendar
 
+# start of subshell for OS file locking
+(
+# start of block for following always to clear up lockfiles.
+# Not needed but harmless if OS file locking is used.
 {
-  calendar_lockfiles $calendar || return 1
+  if zmodload -F zsh/system b:zsystem && zsystem supports flock; then
+    zsystem flock $calendar
+  else
+    calendar_lockfiles $calendar || exit 1
+  fi
 
   eval $editor \$calendar
 } always {
   (( ${#lockfiles} )) && rm -f $lockfiles
 }
+)
 
 (( cal_running )) && calendar -s