fixes #78

src/main/scala/com/github/nscala_time/time/Implicits.scala

@@ -85,6 +85,7 @@ trait JodaImplicits {
   implicit def richDateTimeZone(zone: DateTimeZone): RichDateTimeZone = new RichDateTimeZone(zone)
   implicit def richDuration(dur: Duration): RichDuration = new RichDuration(dur)
   implicit def richInstant(in: Instant): RichInstant = new RichInstant(in)
+  implicit def richInterval(in: Interval): RichInterval = new RichInterval(in)
   implicit def richLocalDate(ld: LocalDate): RichLocalDate = new RichLocalDate(ld)
   implicit def richLocalDateProperty(pty: LocalDate.Property): RichLocalDateProperty = new RichLocalDateProperty(pty)
   implicit def richLocalDateTime(dt: LocalDateTime): RichLocalDateTime = new RichLocalDateTime(dt)

src/main/scala/com/github/nscala_time/time/RichInterval.scala

@@ -0,0 +1,39 @@
+package com.github.nscala_time.time
+
+import JodaImplicits._
+import com.github.nscala_time.PimpedType
+import org.joda.time._
+import scala.collection.generic.CanBuildFrom
+
+class RichInterval(val underlying: Interval) extends Super with PimpedType[Interval] {
+
+  /** Returns a collection containing every instance between the interval, `period` time apart.
+    *
+    * {{{
+    * scala> val start = DateTime.now
+    * start: org.joda.time.DateTime = 2014-11-27T00:24:54.714+01:00
+    *
+    * scala> val end = start + 1.day
+    * end: org.joda.time.DateTime = 2014-11-28T00:24:54.714+01:00
+    *
+    * scala> start to end by 1.minute
+    * res0: scala.collection.immutable.IndexedSeq[org.joda.time.DateTime] = Vector(2014-11-27T00:24:54.714+01:00, ...)
+    *
+    * scala> val coll: Iterator[DateTime] = start to end by 1.minute
+    * coll: Iterator[com.github.nscala_time.time.Imports.DateTime] = non-empty iterator
+    * }}}
+    */
+  def by[CC[_]](period: ReadablePeriod)(implicit cbf: CanBuildFrom[Nothing, DateTime, CC[DateTime]]): CC[DateTime] = {
+    val builder = cbf()
+
+    var x = underlying.getStart
+
+    while (x < underlying.getEnd) {
+      builder += x
+      x += period
+    }
+
+    builder.result
+  }
+
+}

src/test/scala/RichIntervalSpec.scala

@@ -0,0 +1,20 @@
+package com.github.nscala_time.time
+
+import org.scalacheck._
+import org.scalacheck.Prop._
+
+object RichIntervalSpec extends Properties("RichInterval") with Imports {
+
+  property("by") = forAll(Gen.choose(1,1440)) { n =>
+    val start = DateTime.now
+    val end = start + 1.day
+
+    val coll = start to end by n.minute
+
+    coll forall { date =>
+      start <= date &&
+      date <= end
+    }
+  }
+
+}