From 283c19037423aa9ac86b1094950aec04210f9129 Mon Sep 17 00:00:00 2001
From: Hiroshi SHIBATA <hsbt@ruby-lang.org>
Date: Fri, 14 Apr 2023 12:01:01 +0900
Subject: [PATCH] [ruby/nkf] Expose NKF::GEM_VERSION

https://github.com/ruby/nkf/commit/0d0fb3a162
---
 ext/nkf/nkf.c       |  3 +++
 ext/nkf/nkf.gemspec | 12 +++++++++++-
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/ext/nkf/nkf.c b/ext/nkf/nkf.c
index c6ddee1976..f89ad68845 100644
--- a/ext/nkf/nkf.c
+++ b/ext/nkf/nkf.c
@@ -9,6 +9,7 @@
 
 #define RUBY_NKF_REVISION "$Revision$"
 #define RUBY_NKF_VERSION NKF_VERSION " (" NKF_RELEASE_DATE ")"
+#define NKF_GEM_VERSION "0.1.2"
 
 #include "ruby/ruby.h"
 #include "ruby/encoding.h"
@@ -500,4 +501,6 @@ Init_nkf(void)
     rb_define_const(mNKF, "NKF_VERSION", rb_str_new2(NKF_VERSION));
     /* Release date of nkf */
     rb_define_const(mNKF, "NKF_RELEASE_DATE", rb_str_new2(NKF_RELEASE_DATE));
+    /* Version of nkf library */
+    rb_define_const(mNKF, "GEM_VERSION", rb_str_new_cstr(NKF_GEM_VERSION));
 }
diff --git a/ext/nkf/nkf.gemspec b/ext/nkf/nkf.gemspec
index 7f3bd4a4b1..92ab0f22fe 100644
--- a/ext/nkf/nkf.gemspec
+++ b/ext/nkf/nkf.gemspec
@@ -1,6 +1,16 @@
+source_version = ["", "ext/nkf/"].find do |dir|
+  begin
+    break File.open(File.join(__dir__, "#{dir}nkf.c")) {|f|
+      f.gets("\n#define NKF_GEM_VERSION ")
+      f.gets[/\s*"(.+)"/, 1]
+    }
+  rescue Errno::ENOENT
+  end
+end
+
 Gem::Specification.new do |spec|
   spec.name          = "nkf"
-  spec.version       = "0.1.2"
+  spec.version       = source_version
   spec.authors       = ["NARUSE Yui"]
   spec.email         = ["naruse@airemix.jp"]