Fix file each message without given block.

Author: gemmaro

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ## Unreleased
 
+- Fix file each message without given block.
+
 ## CRuby and mruby version 0.3.0 - 2026-03-17
 
 - Add `GettextPO::File#each_message`,

mrblib/mrb_gettextpo_common.rb

@@ -101,7 +101,12 @@ def each_workflow_flag # yields: flag
   end
 
   class File
-    def each_message(domain = nil) # yields: message
+    # call-seq:
+    #   each_message (domain = nil) { |message| ... }
+    #   each_message (domain = nil) -> Enumerator
+    def each_message(domain = nil)
+      block_given? or return enum_for(__method__)
+
       iter = message_iterator(domain)
       while true
         begin

test/file.rb

@@ -71,6 +71,10 @@
   messages = []
   GettextPO::File.read(path).each_message { |message| messages << message.msgid }
   assert_equal ['', 'msgid1'], messages
+
+  assert_equal ['', 'msgid1'],
+               GettextPO::File.read(path).each_message.map { |message| message.msgid }
+
   true
 end