コマンドの確認
bundler help gemを確認
➜ jewelrybox bundler help gem
Usage:
bundler gem GEM [OPTIONS]
Options:
-b, [--bin=Generate a binary for your library.]
-t, [--test=Generate a test directory for your library: 'rspec' is the default, but 'minitest' is also supported.]
-e, [--edit=/path/to/your/editor] # Open generated gemspec in the specified editor (defaults to $EDITOR or $BUNDLER_EDITOR)
[--ext=Generate the boilerplate for C extension code]
[--no-color=Disable colorization in output]
-V, [--verbose=Enable verbose output mode]
-r, [--retry=Specify the number of times you wish to attempt network commands]
Creates a skeleton for creating a rubygem
--extでC拡張用のボイラープレートが出来るとある。ついでに-t minitestでテスト生成。
ひな形の生成
bundle gem --ext -t minitest diamond
➜ jewelrybox bundle gem --ext -t minitest diamond
create diamond/Gemfile
create diamond/Rakefile
create diamond/LICENSE.txt
create diamond/README.md
create diamond/.gitignore
create diamond/diamond.gemspec
create diamond/lib/diamond.rb
create diamond/lib/diamond/version.rb
create diamond/test/minitest_helper.rb
create diamond/test/test_diamond.rb
create diamond/.travis.yml
create diamond/ext/diamond/extconf.rb
create diamond/ext/diamond/diamond.h
create diamond/ext/diamond/diamond.c
Initializing git repo in /Users/ymmtmdk/mygem/jewelrybox/diamond
.gemspecの編集
diamond.gemspecのspec.summaryにこのGemの概要を書く。必須。spec.descriptionはとりあえずコメントアウト。
diamond.gemspec
# coding: utf-8
lib = File.expand_path('../lib', __FILE__)
$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
require 'diamond/version'
Gem::Specification.new do |spec|
spec.name = "diamond"
spec.version = Diamond::VERSION
spec.authors = ["ymmtmdk"]
spec.email = ["ymmtmdk@gmail.com"]
spec.extensions = ["ext/diamond/extconf.rb"]
spec.summary = "the perfectest Gem in the world"
# spec.description = %q{TODO: Write a longer description. Optional.}
spec.homepage = ""
spec.license = "MIT"
spec.files = `git ls-files -z`.split("\x0")
spec.executables = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
spec.test_files = spec.files.grep(%r{^(test|spec|features)/})
spec.require_paths = ["lib"]
spec.add_development_dependency "bundler", "~> 1.7"
spec.add_development_dependency "rake", "~> 10.0"
spec.add_development_dependency "rake-compiler"
spec.add_development_dependency "minitest"
end
Cコードの編集
diamond/ext/diamond/diamond.cをがりがり書く
diamond.c
#include "diamond.h"
static VALUE
piece_price(VALUE self)
{
return INT2NUM(10000000);
}
void
Init_diamond(void)
{
VALUE rb_mDiamond = rb_define_module("Diamond");
VALUE rb_mPiece = rb_define_class_under(rb_mDiamond, "Piece", rb_cObject);
rb_define_method(rb_mPiece, "price", piece_price, 0);
}
コンパイルしてみる
rake compileでエラーが出ないか確認
➜ diamond git:(master) ✗ rake compile
mkdir -p tmp/x86_64-darwin13/diamond/2.2.0
cd tmp/x86_64-darwin13/diamond/2.2.0
/Users/ymmtmdk/.rvm/rubies/ruby-head/bin/ruby -I. ../../../../ext/diamond/extconf.rb
creating Makefile
cd -
cd tmp/x86_64-darwin13/diamond/2.2.0
make
compiling ../../../../ext/diamond/diamond.c
linking shared-object diamond/diamond.bundle
cd -
mkdir -p tmp/x86_64-darwin13/stage/lib/diamond
install -c tmp/x86_64-darwin13/diamond/2.2.0/diamond.bundle lib/diamond/diamond.bundle
cp tmp/x86_64-darwin13/diamond/2.2.0/diamond.bundle tmp/x86_64-darwin13/stage/lib/diamond/diamond.bundle
テストを書く
diamond/test/test_diamond.rbを完璧に仕上げる
test_diamond.rb
require 'minitest_helper'
class TestDiamond < MiniTest::Unit::TestCase
def test_that_it_has_a_version_number
refute_nil ::Diamond::VERSION
end
def test_i_cant_buy_the_price_of_the_gem
assert Diamond::Piece.new.price > 30
end
end
テスト実行
rake test
➜ diamond git:(master) ✗ rake test
MiniTest::Unit::TestCase is now Minitest::Test. From /Users/ymmtmdk/mygem/jewelrybox/diamond/test/test_diamond.rb:3:in `<top (required)>'
Run options: --seed 53137
# Running:
..
Finished in 0.002090s, 956.9378 runs/s, 956.9378 assertions/s.
2 runs, 2 assertions, 0 failures, 0 errors, 0 skips
➜ diamond git:(master) ✗
.gemの生成
rake build
➜ diamond git:(master) ✗ rake build
diamond 0.0.1 built to pkg/diamond-0.0.1.gem.
成功すればpkg/diamond-0.0.1.gemが出来る。
あら簡単。