add repos stats script

script/repos_stats.rb

@@ -0,0 +1,26 @@
+$stdout.sync = true
+
+Repository.where('last_build_finished_at is not null').count(group: :github_language)
+
+rates = Repository.where('last_build_finished_at is not null').count(group: [:last_build_state, :github_language])
+groups = rates.group_by { |k, v| k[1] }
+stats = groups.map do |lang, values|
+  values.inject({ "language" => lang || 'unknown' }) do |result, (state, count)|
+    result.merge(state[0] => count)
+  end
+end
+
+keys = %w(language total passed failed errored cancelled)
+puts keys.join(',')
+
+rows = stats.map do |stat|
+  values = stat.values
+  row = [values.shift]
+  row << stat.values[1..-1].inject(&:+)
+  keys[1..-1].each { |key| row << (stat[key] || 0) }
+  row
+end
+
+rows = rows.sort_by { |row| row[1] }.reverse
+csv = rows.map { |row| row.join(',') }
+puts csv.join("\n")