Merge pull request #15 from schwern/issue/#14

Remove core extensions, add `until`.

.rubocop.yml

@@ -44,6 +44,9 @@ Style/AccessModifierDeclarations:
 Style/AsciiComments:
   Enabled: false
 
+Style/BlockDelimiters:
+  EnforcedStyle: "braces_for_chaining"
+
 Style/FrozenStringLiteralComment:
   Enabled: false
 

lib/time_iterator.rb

@@ -1,32 +1,31 @@
 require "active_support"
-require "active_support/core_ext/integer/time"
-require_relative "time_iterator/core_ext/numeric"
-require_relative "time_iterator/core_ext/time"
+require "active_support/duration"
 
 # Time iteration.
 module TimeIterator
-  INFINITY = 1.0 / 0.0
-  PERIODS = {
-    second: :seconds,
-    minute: :minutes,
-    hour: :hours,
-    day: :days,
-    week: :weeks,
-    month: :months,
-    quarter: :quarters,
-    year: :years
-  }.freeze
-  ITERATE_BY = (PERIODS.keys + PERIODS.values).freeze
-
   class << self
-    def iterate(start, by:, every: 1)
-      by = by.to_sym
+    def iterate(start, by:, to: nil)
+      raise ArgumentError, "`by` must be an ActiveSupport::Duration" unless by.is_a?(ActiveSupport::Duration)
+
+      return to ? iterate_to(start, by: by, to: to) : iterate_endless(start, by: by)
+    end
 
-      raise ArgumentError, "Unknown period to iterate by: #{by}" unless ITERATE_BY.include?(by)
+    private def iterate_endless(start, by:)
+      Enumerator.new do |block|
+        time = start
+        loop do
+          block << time
+          time += by
+        end
+      end
+    end
 
+    private def iterate_to(start, by:, to:)
       Enumerator.new do |block|
-        (0..INFINITY).each do |num|
-          block << (start + (num.send(by) * every))
+        time = start
+        while time <= to
+          block << time
+          time += by
         end
       end
     end

spec/time_iterator_spec.rb

@@ -1,37 +1,64 @@
 RSpec.describe TimeIterator do
-  let(:time) { Time.now }
+  let(:time) { Time.gm(2000, 1, 1, 0, 0, 0) }
 
   describe '.iterate' do
     it 'uses an Enumerator' do
-      expect( described_class.iterate(time, by: :day) ).to be_a(Enumerator)
+      expect(
+        described_class.iterate(time, by: ActiveSupport::Duration.days(1))
+      ).to be_a(Enumerator)
     end
 
-    it 'raises on an invalid period' do
-      expect do
+    it 'raises on an invalid `by`' do
+      expect {
         described_class.iterate(time, by: :colors)
-      end.to raise_error(ArgumentError)
+      }.to raise_error(ArgumentError)
     end
 
-    [
-      :second, :minute, :hour, :day, :week, :month, :quarter, :year,
-      :seconds, :minutes, :hours, :days, :weeks, :months, :quarter, :years
-    ].each do |period|
-      it "iterates by #{period}" do
-        expect(
-          described_class.iterate(time, by: period).take(3)
-        ).to eq [time, time + 1.send(period), time + 2.send(period)]
-      end
+    it "iterates" do
+      expect(
+        described_class.iterate(
+          Time.gm(2000, 1, 1), by: ActiveSupport::Duration.days(3)
+        ).take(3)
+      ).to eq [
+        Time.gm(2000, 1, 1),
+        Time.gm(2000, 1, 4),
+        Time.gm(2000, 1, 7)
+      ]
+    end
+
+    it "stops before `to`" do
+      expect(
+        described_class.iterate(
+          Time.gm(2000, 1, 1),
+          by: ActiveSupport::Duration.days(3),
+          to: Time.gm(2000, 1, 12)
+        ).to_a
+      ).to eq [
+        Time.gm(2000, 1, 1),
+        Time.gm(2000, 1, 4),
+        Time.gm(2000, 1, 7),
+        Time.gm(2000, 1, 10)
+      ]
     end
 
-    it 'iterates every X periods' do
+    it "includes `to`" do
       expect(
-        described_class.iterate(time, by: :day, every: 3).take(3)
-      ).to eq [time, time + 3.days, time + 6.days]
+        described_class.iterate(
+          Time.gm(2000, 1, 1),
+          by: ActiveSupport::Duration.days(3),
+          to: Time.gm(2000, 1, 10)
+        ).to_a
+      ).to eq [
+        Time.gm(2000, 1, 1),
+        Time.gm(2000, 1, 4),
+        Time.gm(2000, 1, 7),
+        Time.gm(2000, 1, 10)
+      ]
     end
 
     it 'does not alter the original time' do
       orig = time.clone
-      described_class.iterate(time, by: :day).take(5)
+      described_class.iterate(time, by: ActiveSupport::Duration.weeks(2)).take(5)
       expect( time ).to eq orig
     end
   end