refactor: move lib/postal/reply_separator to app/lib/reply_separator

app/lib/reply_separator.rb

@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+
+module Postal
+  class ReplySeparator
+
+    RULES = [
+      /^-{2,10} $.*/m,
+      /^>*\s*----- ?Original Message ?-----.*/m,
+      /^>*\s*From:[^\r\n]*[\r\n]+Sent:.*/m,
+      /^>*\s*From:[^\r\n]*[\r\n]+Date:.*/m,
+      /^>*\s*-----Urspr.ngliche Nachricht----- .*/m,
+      /^>*\s*Le[^\r\n]{10,200}a .crit ?:\s*$.*/,
+      /^>*\s*__________________.*/m,
+      /^>*\s*On.{10,200}wrote:\s*$.*/m,
+      /^>*\s*Sent from my.*/m,
+      /^>*\s*=== Please reply above this line ===.*/m,
+      /(^>.*\n?){10,}/
+    ].freeze
+
+    def self.separate(text)
+      return "" unless text.is_a?(String)
+
+      text = text.gsub("\r", "")
+      stripped = String.new
+      RULES.each do |rule|
+        text.gsub!(rule) do
+          stripped = ::Regexp.last_match(0).to_s + "\n" + stripped
+          ""
+        end
+      end
+      stripped = stripped.strip
+      [text.strip, stripped.presence]
+    end
+
+  end
+end