lib/milestoner/commits/collector.rb in milestoner-17.6.0 vs lib/milestoner/commits/collector.rb in milestoner-17.9.0

@@ -1,17 +1,29 @@
 # frozen_string_literal: true
 
+require "dry/monads"
+
 module Milestoner
   module Commits
-    # Collects commits since last tag or all commits if untagged.
+    # Collects commits since last tag, a specific range, or all commits if untagged.
     class Collector
+      include Dry::Monads[:result]
       include Import[:git]
 
-      def call = git.tagged? ? latest : all
+      MIN = :last
+      MAX = :HEAD
 
+      def call(min: MIN, max: MAX) = git.tagged? ? slice(min, max) : all
+
       private
 
-      def latest = git.tag_last.bind { |tag| git.commits "#{tag}..HEAD" }
+      def slice min, max
+        case [min, max]
+          in MIN, MAX then git.tag_last.bind { |tag| git.commits "#{tag}..#{max}" }
+          in String, String then git.commits "#{min}..#{max}"
+          else Failure "Invalid minimum and/or maximum range: #{min}..#{max}."
+        end
+      end
 
       def all = git.commits
     end
   end
 end