#!/usr/bin/python
#*-*coding:utf8*-*

"""适用于在/proc/meminfo中提供了可用内存MemAvailable的系统使用"""

from optparse import OptionParser
import sys

parser = OptionParser()
parser.add_option("-k",
                        dest="k",
                        action="store_true",
                        default=True,
                        help="Display Meminfo KB")
parser.add_option("-m",
                        dest="m",
                        action="store_true",
                        default=False,
                        help="Display Meminfo MB")
parser.add_option("-g",
                        dest="g",
                        action="store_true",
                        default=False,
                        help="Display Meminfo GB")

option, args = parser.parse_args()

with open("/proc/meminfo") as meminfo:
    for i in meminfo:
        if i.startswith("MemTotal"):
            total_mem = i.split()
            total_mem = total_mem[1]
            continue
        elif i.startswith("MemAvailable"):
            free_mem = i.split()
            free_mem = free_mem[1]
            break
        else:
            pass

total_mem, free_mem = float(total_mem), float(free_mem)

x = free_mem/total_mem

if option.k and (not option.m) and (not option.g):
    print("总内存为：%d" %total_mem + " kB")
    print("剩余可用内存为：%d" %free_mem + " kB")
    print("剩余内存可用比例为：%d" %(x*100) + "%" )
elif option.k and option.m and (not option.g):
    print("总内存为：%d" %(total_mem/1024) + " MB")
    print("剩余可用内存为：%d" %(free_mem/1024) + " MB")
    print("剩余内存可用比例为：%d" %(x*100) + "%" )
elif option.k and (not option.m) and option.g:
    print("总内存为：%.2f" %(total_mem/1024/1024) + " GB")
    print("剩余可用内存为：%.2f" %(free_mem/1024/1024) + " GB")
    print("剩余内存可用比例为：%d" %(x*100) + "%" )
else:
    pass