Capture potential NameError exception in asked_for_progress? method

A known bug in JRuby would cause aquatone to error out because the
IO::EAGAINWaitReadable constant has not been defined.

Capture this potential exception and return false to prevent aquatone
from crashing.

CHANGELOG.md

@@ -8,6 +8,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 ### Added
 
 ### Changed
+ - Capture potential `NameError` exception in `asked_for_progress?` method,
+   related to known JRuby bug (issue #4)
 
 ## [0.1.1]
 ### Added
@@ -22,5 +24,5 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ### Changed
 
-[Unreleased]: https://github.com/michenriksen/aquatone/compare/v0.1.0...HEAD
+[Unreleased]: https://github.com/michenriksen/aquatone/compare/v0.1.1...HEAD
 [0.1.1]: https://github.com/michenriksen/aquatone/compare/v0.1.0...v0.1.1

lib/aquatone/command.rb

@@ -112,14 +112,18 @@ def seconds_to_time(seconds)
     end
 
     def asked_for_progress?
-      while c = STDIN.read_nonblock(1)
-        return true if c == "\n"
+      begin
+        while c = STDIN.read_nonblock(1)
+          return true if c == "\n"
+        end
+        false
+      rescue IO::EAGAINWaitReadable
+        false
+      rescue Errno::EINTR, Errno::EAGAIN, EOFError
+        true
       end
+    rescue NameError
       false
-    rescue IO::EAGAINWaitReadable
-      false
-    rescue Errno::EINTR, Errno::EAGAIN, EOFError
-      true
     end
 
     def has_executable?(name)