1 files changed, 123 insertions, 2 deletions
diff --git a/lib/mruby_gem_scaffolding.rb b/lib/mruby_gem_scaffolding.rb
index 8dca6f3..67ffba6 100644
--- a/lib/mruby_gem_scaffolding.rb
+++ b/lib/mruby_gem_scaffolding.rb
@@ -1,6 +1,127 @@
 require "mruby_gem_scaffolding/version"
 
 module MrubyGemScaffolding
-  class Error < StandardError; end
-  # Your code goes here...
+  module Utility
+    class << self
+      # from thor gem
+      def snake_case(str)
+        return str.downcase if str =~ /^[A-Z_]+$/
+        str.gsub(/\B[A-Z]/, '_\&').squeeze("_") =~ /_*(.*)/
+        Regexp.last_match(-1).downcase
+      end
+
+      # from thor gem
+      def camel_case(str)
+        return str if str !~ /_/ && str =~ /[A-Z]+.*/
+        str.split("_").map(&:capitalize).join
+      end
+    end
+  end
+
+  class << self
+    def empty_project
+      {
+        "README.md" => '',
+        "mrbgem.rake" => '',
+        "include" => {},
+        "mrblib" => {},
+        "src" => {},
+        "tools" => {},
+        "test" => {},
+        "LICENSE" => '',
+      }
+    end
+
+    def generate(user_name:, project_name:)
+      result = empty_project
+
+      result["README.md"] =
+        <<MULTILINE
+# #{Utility.camel_case(project_name)}
+An mruby gem created by #{user_name} using mruby_gem_scaffolding.
+MULTILINE
+
+      result["mrbgem.rake"] =
+        <<MULTILINE
+MRuby::Gem::Specification.new('#{Utility.snake_case(project_name)}') do |spec|
+  spec.license = 'MIT'
+  spec.author  = '#{user_name}'
+end
+MULTILINE
+
+      result["src"]["main.c"] =
+        <<MULTILINE
+#include <mruby.h>
+#include <stdio.h>
+
+// defining the function to be later bound to a ruby method
+static mrb_value
+hello_world(mrb_state *mrb, mrb_value self)
+{
+    printf("Hello World");
+
+    return mrb_nil_value(); // return null
+}
+
+// gem initializer
+void
+mrb_#{Utility.snake_case(project_name)}_gem_init(mrb_state* mrb) {
+    struct RClass *#{Utility.snake_case(project_name)}_class = mrb_define_module(mrb, "#{Utility.camel_case(project_name)}");
+    mrb_define_class_method(
+      mrb,                    // Mruby VM state
+      #{Utility.snake_case(project_name)}_class,  // Class we bind method to
+      "say_hello",            // Name of method
+      hello_world,        // Function we are binding as a method
+      MRB_ARGS_NONE()         // How many arguments are optional/required
+    );
+}
+
+// gem finalizer
+void
+mrb_#{Utility.snake_case(project_name)}_gem_final(mrb_state* mrb) {
+
+}
+MULTILINE
+
+      result["LICENSE"] =
+        <<MULTILINE
+The MIT License (MIT)
+
+Copyright (c) #{Time.now.year} #{user_name}
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+
+MULTILINE
+
+      return result
+    end
+
+    def write(dir, hash_data)
+      Dir.mkdir dir unless File.exists? dir
+      hash_data.each do |key, value|
+        if value.is_a? Hash
+          write("#{dir}/#{key}", value)
+        else
+          File.open("#{dir}/#{key}", 'w') { |file| file.write(value) }
+        end
+      end
+    end
+  end
+
 end