Extract version number from the source

"requiring version.rb" strategy has some issues.

- cannot work when cross-compiling
- often introduces wrong namespace
- must know the superclasses
- costs at each runtime than at build-time

etc.

1 files changed, 4 insertions, 3 deletions

diff --git a/lib/optparse/optparse.gemspec b/lib/optparse/optparse.gemspec
index 25f81c08bb..3de0c07f43 100644
--- a/lib/optparse/optparse.gemspec
+++ b/lib/optparse/optparse.gemspec
@@ -1,7 +1,8 @@
+# frozen_string_literal: true
+
 name = File.basename(__FILE__, ".gemspec")
-version = nil
-["lib", ".."].find do |dir|
-  version = File.foreach(File.join(__dir__, dir, "#{name}.rb")) do |line|
+version = ["lib", Array.new(name.count("-")+1, "..").join("/")].find do |dir|
+  break File.foreach(File.join(__dir__, dir, "#{name.tr('-', '/')}.rb")) do |line|
     /^\s*OptionParser::Version\s*=\s*"(.*)"/ =~ line and break $1
   end rescue nil
 end