~azzar1/unity/add-show-desktop-key

# IVLE

# Copyright (C) 2008 The University of Melbourne

#

# 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 2 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, write to the Free Software

# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

'''Utilities for making nice, human readable dates.'''

import time

import datetime

def get_datetime(datetime_or_seconds):

    '''Return the given datetime, or convert the given seconds since epoch.

    >>> get_datetime(1000000000)

    datetime.datetime(2001, 9, 9, 11, 46, 40)

    >>> get_datetime(2000000000)

    datetime.datetime(2033, 5, 18, 13, 33, 20)

    >>> get_datetime(datetime.datetime(2009, 5, 26, 11, 38, 53))

    datetime.datetime(2009, 5, 26, 11, 38, 53)

    >>> get_datetime(datetime.datetime(2001, 9, 9, 11, 46, 40))

    datetime.datetime(2001, 9, 9, 11, 46, 40)

    '''

    if type(datetime_or_seconds) is datetime.datetime:

        return datetime_or_seconds

    return datetime.datetime.fromtimestamp(datetime_or_seconds)

def make_date_nice(datetime_or_seconds):

    """Generate a full human-readable representation of a date and time.

    Given a datetime or number of seconds elapsed since the epoch,

    generates a string representing the date/time in human-readable form.

    "ddd mmm dd, yyyy h:m a"

    >>> make_date_nice(datetime.datetime(2009, 5, 26, 11, 38, 53))

    'Tue May 26 2009, 11:38am'

    """

    dt = get_datetime(datetime_or_seconds)

    return dt.strftime("%a %b %d %Y, %l:%M%P")

def make_date_nice_short(datetime_or_seconds):

    """Generate a very compact human-readable representation of a date.

    Given a datetime or number of seconds elapsed since the epoch,

    generates a string representing the date in human-readable form.

    Does not include the time.

    >>> now = datetime.datetime.now()

    >>> make_date_nice_short(now)

    'Today'

    >>> make_date_nice_short(now - datetime.timedelta(1))

    'Yesterday'

    >>> make_date_nice_short(now - datetime.timedelta(2))

    '2 days ago'

    >>> make_date_nice_short(now - datetime.timedelta(5))

    '5 days ago'

    >>> make_date_nice_short(1242783748)

    'May 20'

    """

    dt = get_datetime(datetime_or_seconds)

    now = datetime.datetime.now()

    # Use a "naturalisation" algorithm.

    delta = now - dt

    if delta.days <= 5:

        # Dates today or yesterday, return "today" or "yesterday".

        if delta.days == 0:

            return "Today"

        elif delta.days == 1:

            return "Yesterday"

        else:

            # Dates in the last 5 days, return "n days ago".

            return str(delta.days) + " days ago"

    # Other dates, return a short date format.

    # If within the same year, omit the year (mmm dd)

    if dt.year == now.year:

        return dt.strftime("%b %d")

    # Else, include the year (mmm dd, yyyy)

    else:

        return dt.strftime("%b %d, %Y")

def format_datetime_for_paragraph(datetime_or_seconds):

    """Generate a compact representation of a datetime for use in a paragraph.

    Given a datetime or number of seconds elapsed since the epoch, generates

    a compact string representing the date and time in human-readable form.

    Unlike make_date_nice_short, the time will always be included.

    Also unlike make_date_nice_short, it is suitable for use in the middle of

    a block of prose and properly handles timestamps in the future nicely.

    >>> now = datetime.datetime.now()

    >>> today = now.date()

    >>> time = datetime.time(10, 35, 40)

    >>> earlier = datetime.datetime.combine(today, time)

    >>> date = datetime.datetime(2009, 5, 20, 21, 19, 53)

    >>> format_datetime_for_paragraph(now)

    'now'

    # We can go backwards and forwards a little while and be pretty.

    >>> format_datetime_for_paragraph(now - datetime.timedelta(0, 40))

    '40 seconds ago'

    >>> format_datetime_for_paragraph(now + datetime.timedelta(0, 30))

    'in 29 seconds'

    >>> format_datetime_for_paragraph(now - datetime.timedelta(0, 245))

    '4 minutes ago'

    >>> format_datetime_for_paragraph(now + datetime.timedelta(0, 3500))

    'in 58 minutes'

    # If we go back further, it gets a bit ugly.

    >>> format_datetime_for_paragraph(earlier - datetime.timedelta(1))

    'yesterday at 10:35am'

    >>> format_datetime_for_paragraph(date)

    'on 2009-05-20 at  9:19pm'

    >>> format_datetime_for_paragraph(earlier + datetime.timedelta(1))

    'tomorrow at 10:35am'

    """

    dt = get_datetime(datetime_or_seconds)

    now = datetime.datetime.now()

    delta = dt - now

    # If the date is earlier than now, we want to either say something like

    # '5 days ago' or '25 seconds ago', 'yesterday at 08:54' or

    # 'on 2009-03-26 at 20:09'.

    # If the time is within one hour of now, we show it nicely in either

    # minutes or seconds.

    if abs(delta).days == 0 and abs(delta).seconds <= 1:

        return 'now'

    if abs(delta).days == 0 and abs(delta).seconds < 60*60:

        if abs(delta) == delta:

            # It's in the future.

            prefix = 'in '

            suffix = ''

        else:

            prefix = ''

            suffix = ' ago'

        # Show the number of minutes unless we are within two minutes.

        if abs(delta).seconds >= 120:

            return (prefix + '%d minutes' + suffix) % (abs(delta).seconds / 60)

        else:

            return (prefix + '%d seconds' + suffix) % (abs(delta).seconds)

    if dt < now:

        if dt.date() == now.date():

            # Today.

            return dt.strftime('today at %l:%M%P')

        elif dt.date() == now.date() - datetime.timedelta(days=1):

            # Yesterday.

            return dt.strftime('yesterday at %l:%M%P')

    elif dt > now:

        if dt.date() == now.date():

            # Today.

            return dt.strftime('today at %l:%M%P')

        elif dt.date() == now.date() + datetime.timedelta(days=1):

            # Tomorrow

            return dt.strftime('tomorrow at %l:%M%P')

    return dt.strftime('on %Y-%m-%d at %l:%M%P')