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"""

Sebastian Raschka 2014

watermark.py

version 1.1.0

IPython magic function to print date/time stamps and various system information.

Installation:

%install_ext https://raw.githubusercontent.com/rasbt/python_reference/master/ipython_magic/watermark.py

Usage:

%load_ext watermark

%watermark

optional arguments:

-a AUTHOR, --author AUTHOR

prints author name

-d, --date prints current date

-n, --datename prints date with abbrv. day and month names

-t, --time prints current time

-z, --timezone appends the local time zone

-u, --updated appends a string "Last updated: "

-c CUSTOM_TIME, --custom_time CUSTOM_TIME

prints a valid strftime() string

-v, --python prints Python and IPython version

-p PACKAGES, --packages PACKAGES

prints versions of specified Python modules and

packages

-h, --hostname prints the host name

-m, --machine prints system and machine info

-g, --githash prints current Git commit hash

Examples:

%watermark -d -t

"""

import platform

import subprocess

from time import strftime

from socket import gethostname

from pkg_resources import get_distribution

from multiprocessing import cpu_count

import IPython

from IPython.core.magic import Magics, magics_class, line_magic

from IPython.core.magic_arguments import argument, magic_arguments, parse_argstring

@magics_class

class WaterMark(Magics):

"""

IPython magic function to print date/time stamps

and various system information.

"""

@magic_arguments()

@argument('-a', '--author', type=str, help='prints author name')

@argument('-d', '--date', action='store_true', help='prints current date')

@argument('-n', '--datename', action='store_true', help='prints date with abbrv. day and month names')

@argument('-t', '--time', action='store_true', help='prints current time')

@argument('-z', '--timezone', action='store_true', help='appends the local time zone')

@argument('-u', '--updated', action='store_true', help='appends a string "Last updated: "')

@argument('-c', '--custom_time', type=str, help='prints a valid strftime() string')

@argument('-v', '--python', action='store_true', help='prints Python and IPython version')

@argument('-p', '--packages', type=str, help='prints versions of specified Python modules and packages')

@argument('-h', '--hostname', action='store_true', help='prints the host name')

@argument('-m', '--machine', action='store_true', help='prints system and machine info')

@argument('-g', '--githash', action='store_true', help='prints current Git commit hash')

@line_magic

def watermark(self, line):

"""

IPython magic function to print date/time stamps

and various system information.

watermark version 1.1.0

"""

self.out = ''

args = parse_argstring(self.watermark, line)

if not any(vars(args).values()):

self.out += strftime('%d/%m/%Y %H:%M:%S')

self._get_pyversions()

self._get_sysinfo()

else:

if args.author:

self.out += '% s ' %args.author.strip('\'"')

if args.updated:

self.out += 'Last updated: '

if args.custom_time:

self.out += '%s ' %strfime(args.custom_time)

if args.date:

self.out += '%s ' %strftime('%d/%m/%Y')

elif args.datename:

self.out += '%s ' %strftime('%a %b %M %Y')

if args.time:

self.out += '%s ' %strftime('%H:%M:%S')

if args.timezone:

self.out += strftime('%Z')

if args.python:

self._get_pyversions()

if args.packages:

self._get_packages(args.packages)

if args.machine:

self._get_sysinfo()

if args.hostname:

space = ''

if args.machine:

space = ' '

self.out += '\nhost name%s: %s' %(space, gethostname())

if args.githash:

self._get_commit_hash(bool(args.machine))

print(self.out)

def _get_packages(self, pkgs):

if self.out:

self.out += '\n'

packages = pkgs.split(',')

for p in packages:

self.out += '\n%s %s' %(p, get_distribution(p).version)

def _get_pyversions(self):

if self.out:

self.out += '\n\n'

self.out += '%s %s\nIPython %s' %(

platform.python_implementation(),

platform.python_version(),

IPython.__version__

)

def _get_sysinfo(self):

if self.out:

self.out += '\n\n'

self.out += 'compiler : %s\nsystem : %s\n'\

'release : %s\nmachine : %s\n'\

'processor : %s\nCPU cores : %s\ninterpreter: %s'%(

platform.python_compiler(),

platform.system(),

platform.release(),

platform.machine(),

platform.processor(),

cpu_count(),

platform.architecture()[0]

)

def _get_commit_hash(self, machine):

process = subprocess.Popen(['git', 'rev-parse', 'HEAD'], shell=False, stdout=subprocess.PIPE)

git_head_hash = process.communicate()[0].strip()

space = ''

if machine:

space = ' '

self.out += '\nGit hash%s: %s' %(space, git_head_hash.decode("utf-8"))

def load_ipython_extension(ipython):

ipython.register_magics(WaterMark)