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+# -*- coding: utf-8 -*-
+
+# sysdata
+
+# Sysdata is a module uses great Py3status (i3status wrapper) to
+# display system information (RAM usage) in i3bar (Linux systems).
+# For more information read:
+# i3wm homepage: http://i3wm.org
+# py3status homepage: https://github.com/ultrabug/py3status
+
+# Copyright (C) <2013> <Shahin Azad [ishahinism at Gmail]>
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import subprocess
+from time import time
+
+
+class GetData:
+    """Get system status
+
+    """
+    def execCMD(self, cmd, arg):
+        """Take a system command and its argument, then return the result.
+
+        Arguments:
+        - `cmd`: system command.
+        - `arg`: argument.
+        """
+        result = subprocess.check_output([cmd, arg])
+        return result
+
+    def memory(self):
+        """Execute 'free -m' command, grab the memory capacity and used size
+        then return; Memory size 'total_mem', Used_mem, and percentage
+        of used memory.
+
+        """
+        # Run 'free -m' command and make a list from output.
+        mem_data = self.execCMD('free', '-m').split()
+        total_mem = int(mem_data[7]) / 1024.
+        used_mem = int(mem_data[15]) / 1024.
+        # Caculate percentage
+        used_mem_percent = int(used_mem / (total_mem / 100))
+
+        # Results are in kilobyte.
+        return total_mem, used_mem, used_mem_percent
+
+
+class Py3status:
+    """
+    System status in i3bar
+    """
+    def ramInfo(self, json, i3status_config):
+        """calculate the memory (RAM) status and return it.
+
+        """
+        data = GetData()
+        response = {'full_text': '', 'name': 'ram_info'}
+        total_mem, used_mem, used_mem_percent = data.memory()
+
+        if used_mem_percent <= 40:
+            response['color'] = i3status_config['color_good']
+        elif used_mem_percent <= 75:
+            response['color'] = i3status_config['color_degraded']
+        else:
+            response['color'] = i3status_config['color_bad']
+
+        response['full_text'] = "RAM: %.2f/%.2f GB (%d%%)" % \
+                                (used_mem, total_mem, used_mem_percent)
+        response['cached_until'] = time()
+
+        return (0, response)