lib/fugit/cron.rb in fugit-1.3.3 vs lib/fugit/cron.rb in fugit-1.3.4

@@ -186,10 +186,21 @@
 
     def day_match?(nt)
 
       return weekday_match?(nt) || monthday_match?(nt) \
         if @weekdays && @monthdays
+          #
+          # From `man 5 crontab`
+          #
+          # Note: The day of a command's execution can be specified
+          # by two fields -- day of month, and day of week.
+          # If both fields are restricted (ie, are not *), the command will be
+          # run when either field matches the current time.
+          # For example, ``30 4 1,15 * 5'' would cause a command to be run
+          # at 4:30 am on the 1st and 15th of each month, plus every Friday.
+          #
+          # as seen in gh-5 and gh-35
 
       return false unless weekday_match?(nt)
       return false unless monthday_match?(nt)
 
       true
@@ -334,9 +345,10 @@
       slots.each do |k, v0, v1, a|
         next unless a && a.length > 1
         return (a + [ a.first + v1 ])
           .each_cons(2)
           .collect { |a0, a1| a1 - a0 }
+          .select { |d| d > 0 } # weed out zero deltas
           .min * v0
       end
 
       slots.reverse.each do |k, v0, v1, a|
         return v0 * v1 if a && a.length == 1