stevenharman · December 16, 2020 17:28 · Dec 16, 2020 · Dec 16, 2020
diff --git a/erb_now.rb b/erb_now.rb
@@ -0,0 +1,30 @@
+require "ostruct"
+
+# A wrapper around a single ERB template that will bind the given Hash of values,
+# making them available as local variables w/in the template.
+class ErbNow < OpenStruct
+  # Render a given ERB +template+ string, binding the entries in the given +attrs+ Hash
+  # as local variables in the template, with the key as the variable name.
+  #
+  # @example
+  #
+  # template = <<~ERB
+  #  <h1>Hello, <%= name %>!</h1>
+  #  <p>The current time is: <time datetime="<%= timestamp %>"><%= timestamp.strftime("%d of %B, %Y")%></time>.</p>
+  # ERB
+  #
+  # ErbNow.render(template, name: "Alice", timestamp: Time.now)
+  #
+  # => <h1>Hello, Alice</h1>
+  # => <p>The current time is: <time datetime="2020-12-16 10:31:36 -0500">16 of December, 2020</time>.</p>
+  #
+  # @param [String] template An ERB template, as a String.
+  # @param [Hash] attrs A Hash of values to be bound to the template, with the key as the local name.
+  def self.render(template, attrs = {})
+    new(attrs).render(template)
+  end
+
+  def render(template)
+    ERB.new(template).result(binding)
+  end
+end