a pipe in front seems to help with ^D behaviour

Author: inopinatus

README.md

@@ -78,10 +78,6 @@ end
 
 See Examples for more, like daisy-chaining, or updating a digest.
 
-## Note
-
-If testing with cooked interactive input at the console, note that linefeed's demo naturally reads in binary mode, so `^D` may not be instant EOF.
-
 ## License
 
 MIT license. Copyright (c) 2026 inopinatus

Rakefile

@@ -21,7 +21,7 @@ file 'tmp/Examples.md' => ['tmp', *FileList['examples/*.rb']] do |f|
       # Examples
 
       Contents of
-      {inopinatus/linefeed/examples/}[https://github.com/inopinatus/linefeed/tree/main/examples],
+      {linefeed:examples/}[https://github.com/inopinatus/linefeed/tree/main/examples],
       concatenated here for easy consumption.
 
     HEAD

examples/demo.rb

@@ -11,10 +11,11 @@
 
 def run
   recipients = Demo.setup_examples
+  input = Demo.input_pipe(ARGF)
   maxlen = 8192
   chunk = ''.b
 
-  while $stdin.read(maxlen, chunk)
+  while input.read(maxlen, chunk) && !chunk.empty?
     recipients.each do |r|
       r << chunk
     end

examples/demo_helper.rb

@@ -8,6 +8,19 @@ def <<(obj)=puts "#{@prefix}: #{obj.inspect}"
     def close()=puts "#{@prefix} closed."
   end
 
+  # decouple from tty if demo run interactively
+  def self.input_pipe(source)
+    return source unless $stdin.tty?
+
+    reader, writer = IO.pipe
+    Thread.new do
+      IO.copy_stream(source, writer)
+    ensure
+      writer.close unless writer.closed?
+    end
+    reader
+  end
+
   # Example registry
   @example_classes = []
   class << self