Merge pull request #2846 from take-cheeze/mgem_mrbgem

Add :mgem gem loading.

doc/mrbgems/README.md

@@ -26,6 +26,15 @@ conf.gem :github => 'masuidrive/mrbgems-example', :branch => 'master'
 conf.gem :bitbucket => 'mruby/mrbgems-example', :branch => 'master'
 ```
 
+To use mrbgem from [mgem-list](https://github.com/mruby/mgem-list) use `:mgem` option:
+```ruby
+conf.gem :mgem => 'mruby-yaml'
+conf.gem :mgem => 'yaml' # 'mruby-' prefix could be ignored
+```
+
+If there is missing dependencies, mrbgem dependencies solver will reference
+mrbgem from core or mgem-list.
+
 To pull all gems from remote GIT repository on build, call ```./minirake -p```,
 or ```./minirake --pull-gems```.
 

tasks/mrbgem_spec.rake

@@ -304,7 +304,14 @@ module MRuby
         default_gems = []
         each do |g|
           g.dependencies.each do |dep|
-            default_gems << dep if dep[:default] and not gem_table.key? dep[:gem]
+            unless gem_table.key? dep[:gem]
+              if dep[:default]; default_gems << dep
+              elsif File.exist? "#{root}/mrbgems/#{dep[:gem]}" # check core
+                default_gems << { :gem => dep[:gem], :default => { :core => dep[:gem] } }
+              else # fallback to mgem-list
+                default_gems << { :gem => dep[:gem], :default => { :mgem => dep[:gem] } }
+              end
+            end
           end
         end
 
@@ -316,7 +323,11 @@ module MRuby
           spec.setup
 
           spec.dependencies.each do |dep|
-            default_gems << dep if dep[:default] and not gem_table.key? dep[:gem]
+            unless gem_table.key? dep[:gem]
+              if dep[:default]; default_gems << dep
+              else default_gems << { :gem => dep[:gem], :default => { :mgem => dep[:gem] } }
+              end
+            end
           end
           gem_table[spec.name] = spec
         end

tasks/mruby_build_gem.rake

@@ -52,6 +52,26 @@ module MRuby
         else
           params[:git] = "https://bitbucket.org/#{params[:bitbucket]}.git"
         end
+      elsif params[:mgem]
+        mgem_list_dir = "#{gem_clone_dir}/mgem-list"
+        mgem_list_url = 'https://github.com/mruby/mgem-list.git'
+        if File.exist? mgem_list_dir
+          git.run_pull mgem_list_dir, mgem_list_url if $pull_gems
+        else
+          FileUtils.mkdir_p mgem_list_dir
+          git.run_clone mgem_list_dir, mgem_list_url
+        end
+
+        require 'yaml'
+
+        conf_path = "#{mgem_list_dir}/#{params[:mgem]}.gem"
+        conf_path = "#{mgem_list_dir}/mruby-#{params[:mgem]}.gem" unless File.exist? conf_path
+        fail "mgem not found: #{params[:mgem]}" unless File.exist? conf_path
+        conf = YAML.load File.read conf_path
+
+        fail "unknown mgem protocol: #{conf['protocol']}" if conf['protocol'] != 'git'
+        params[:git] = conf['repository']
+        params[:branch] = conf['branch"] if conf["branch']
       end
 
       if params[:core]