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.

2 files changed, 9 insertions, 9 deletions

diff --git a/lib/pstore/pstore.gemspec b/lib/pstore/pstore.gemspec
index e781c77043..d04fddcb0a 100644
--- a/lib/pstore/pstore.gemspec
+++ b/lib/pstore/pstore.gemspec
@@ -1,12 +1,15 @@
-begin
-  require_relative "lib/pstore/version"
-rescue LoadError # Fallback to load version file in ruby core repository
-  require_relative "version"
+# frozen_string_literal: true
+
+name = File.basename(__FILE__, ".gemspec")
+version = ["lib", Array.new(name.count("-")+1, "..").join("/")].find do |dir|
+  break File.foreach(File.join(__dir__, dir, "#{name.tr('-', '/')}.rb")) do |line|
+    /^\s*VERSION\s*=\s*"(.*)"/ =~ line and break $1
+  end rescue nil
 end
 
 Gem::Specification.new do |spec|
-  spec.name          = "pstore"
-  spec.version       = PStore::VERSION
+  spec.name          = name
+  spec.version       = version
   spec.authors       = ["Yukihiro Matsumoto"]
   spec.email         = ["matz@ruby-lang.org"]
 
diff --git a/lib/pstore/version.rb b/lib/pstore/version.rb
deleted file mode 100644
index 0e7a3fbd15..0000000000
--- a/lib/pstore/version.rb
+++ /dev/null
@@ -1,3 +0,0 @@
-class PStore
-  VERSION = "0.1.0"
-end