Vice-Speaker-Rotator/vice-speaker-rotator.py

#!/usr/bin/env python3
from datetime import date, timedelta
import sys
import argparse
from argparse import RawTextHelpFormatter
import yaml

# text appended to the end of generated emails
email_body = """
Full speaker schedule:
https://cs.uwaterloo.ca/twiki/view/CrySP/SpeakerSchedule

Other upcoming events:
https://cs.uwaterloo.ca/twiki/view/CrySP/UpcomingEvents
"""


def str_to_date(string_date):
    if type(string_date) is date:
        return string_date
    try:
        return date(*[int(s) for s in string_date.split('-')])
    except:
        print("invalid date: " + string_date)
        sys.exit()


class CryspCalendar:
    """Representation of a CrySP weekly meeting schedule for a term"""
    def __init__(self, start, end=None, weeks=None, names=[],
                 constraints=[], practice_talks=[], half_practices=[],
                 notes=[], irc_handles=dict(), no_repeat=False):
        self.dates = self.meeting_dates(start, end, weeks)
        self.names = names
        self.constraints = self.parse_constraints(constraints)
        self.practice_talks      = self.parse_practice_talks(practice_talks)
        self.practice_talks.update(self.parse_practice_talks(half_practices,
                                                             half=True))
        self.notes      = self.parse_notes(notes)
        self.notes.update(self.parse_notes(map(lambda l: l[1:],
                                               practice_talks)))
        self.notes.update(self.parse_notes(map(lambda l: l[1:],
                                               half_practices)))
        self.verify_constraints()
        self.irc_handles = irc_handles
        self.no_repeat = no_repeat

    def meeting_dates(self, start, end=None, weeks=None):
        first_meeting = str_to_date(start)
        last_meeting = None
        if end:
            last_meeting = str_to_date(end)
        if weeks:
            last_meeting = min(first_meeting + timedelta(weeks=weeks),
                               last_meeting)
        ret = []
        next_meeting = first_meeting
        one_week = timedelta(weeks=1)
        while next_meeting <= last_meeting:
            ret.append(next_meeting)
            next_meeting += one_week
        return ret

    def parse_constraints(self, constraints):
        """takes an iterable of (name,datestr,...) tuples"""
        constraint_dict = {}
        for constraint in constraints:
            name      = constraint[0]
            date_strs = constraint[1:]
            dates     = []
            for date_str in date_strs:
                if type(date_str) is not date and '--' in date_str:
                    # date_range = list(map(str_to_date, date_str.split('--')))
                    date_range = date_str.split('--')
                    date_range = [str_to_date(date_range[0]),
                                  str_to_date(date_range[1])]
                    [dates.append(d) for d in self.dates
                     if date_range[0] <= d <= date_range[1]]
                else:
                    dates.append(str_to_date(date_str))
            constraint_dict[name] = dates
        return constraint_dict

    def parse_practice_talks(self, practice, half=False):
        """'practice' is an iterable of (name, day, note) tuples"""
        practice_dict = {}
        for talk in practice:
            name = talk[0]
            day = str_to_date(talk[1])
            if day in practice_dict:
                assert half,\
                    'conflicting talks: %s and %s on %s' %\
                    (practice_dict[day][0], name, day)
                practice_dict[day].append(name)
            elif half:
                practice_dict[day] = [name, ]
            else:
                practice_dict[day] = [name, '']
        return practice_dict

    def parse_notes(self, notes):
        """takes an iterable of (day, note) tuples"""
        notes_dict = {}
        for note in notes:
            day = str_to_date(note[0])
            message = note[1]
            assert day not in notes_dict or notes_dict[day] == message,\
                'conflicting notes: "%s" and "%s" on %s' %\
                (notes_dict[day], message, note[0])
            notes_dict[day] = message
        return notes_dict

    def verify_constraints(self):
        for name in self.constraints:
            for day in self.constraints[name]:
                assert day in self.dates,\
                    "constraint %s on %s isnt a meeting date" %\
                    (name, day)
        for day in self.practice_talks:
            assert day in self.dates,\
                'talk by %s designated on %s, which is not a meeting date' %\
                (self.practice_talks[day][0], day)
        for day in self.notes:
            assert day in self.dates,\
                'note "%s" designated on %s, which is not a meeting date' %\
                (self.notes[day], day)

    def pop_name(self, day, names, i):
        """Pops the name of the next available on day from the names stack,
           where 'i' is which speaker they would be for that day (0 or 1).
           Returns None if no speakers are left in the given names stack."""
        name = None
        if day in self.practice_talks:
            if i < len(self.practice_talks[day]):
                name = self.practice_talks[day][i]
        if name is None:
            constrained_names = (name for name in names
                                 if name not in self.constraints
                                 or day  not in self.constraints[name])
            name = next(constrained_names, None)
        if name and name in names:
            names.remove(name)
        return name

    def next_speaker(self, day, names, i):
        """Wrapper for pop_name() that repopulates names stack if needed."""
        name = self.pop_name(day, names, i)
        if name or self.no_repeat:
            return name
        names.extend(self.names)
        return self.pop_name(day, names, i)

    def date_to_speakers(self, day, names):
        speaker1 = self.next_speaker(day, names, 0)
        speaker2 = self.next_speaker(day, names, 1)
        note = self.notes.get(day, '')
        return speaker1, speaker2, note

    def table(self, today=date.today()):
        """Returns a string containing a twiki table."""
        table = '| *Date* | *Speakers* | *Notes* |\n'
        names = self.names.copy()
        for day in self.dates:
            color = "%SILVER% " if day <= today else ""
            endcolor = " %ENDCOLOR%" if day <= today else ""
            speaker1, speaker2, note = self.date_to_speakers(day, names)
            speaker2 = ', ' + speaker2 if speaker2 else ""
            row = "| {}{}{} | {}{}{}{} | {}{}{} |\n".format(
                color, day.strftime('%b %e'), endcolor,
                color, speaker1, speaker2, endcolor,
                color, note, endcolor
            )
            table += row
        return table

    def email(self, weeks=2, today=date.today()):
        """Returns a string for emailing to the lab who is speaking next"""
        emailstr = ''
        names = self.names.copy()
        i = 0
        for day in self.dates:
            if day <= today:
                self.date_to_speakers(day, names)
                continue
            i += 1
            if i > weeks:
                break
            speaker1, speaker2, note = self.date_to_speakers(day, names)
            emailstr += day.strftime('%b %e: ')
            if speaker1:
                emailstr += speaker1
                if speaker2:
                    emailstr += ', ' + speaker2
                if note != '':
                    emailstr += ' (' + note + ')'
            else:
                emailstr += note
            emailstr += '\n'
        emailstr += email_body
        return emailstr

    def irc(self, today=date.today()):
        """Returns a string for putting in the IRC channel topic"""
        names = self.names.copy()
        i = 0
        for day in self.dates:
            if day <= today:
                self.date_to_speakers(day, names)
                continue
            i += 1
            speaker1, speaker2, note = self.date_to_speakers(day, names)
            if speaker1:
                speaker1 = self.irc_handles.get(speaker1, speaker1)
                if speaker2:
                    speaker2 = ', ' + self.irc_handles.get(speaker2, speaker2)
                if note != '':
                    note = ' (' + note + ')'
            return "{}{}{}".format(speaker1, speaker2, note)


def parse_constraintsfile(filename):
    with open(filename, 'r') as f:
        tweaks = {'c': [], 'p': [], 'h': [], 'n': []}
        for line in f:
            line = [x.strip() for x in line.rstrip().split(',')]
            tweaks[line[0]].append(line[1:])
        return tweaks['c'], tweaks['p'], tweaks['h'], tweaks['n']


def parse_yaml(filename, today=date.today()):
    with open(filename, 'r') as f:
        struct = yaml.safe_load(f)
    currentTerm = None
    for term in struct['terms'].values():
        if 'start' in term and 'end' in term:
            term['end'] = str_to_date(term['end'])
            term['start'] = str_to_date(term['start'])
            if currentTerm is None or (term['end'] >= today and
                                       term['start'] > currentTerm['start']):
                currentTerm = term
    names = currentTerm['speakers']
    for name in names:
        assert name not in currentTerm['out']

    def triple_check(field_name, location):
        return field_name in location and \
            location[field_name] is not None and \
            len(location[field_name]) > 0

    constraints = [[name] + struct['speakers'][name]['constraints']
                   for name in names
                   if triple_check('constraints', struct['speakers'][name])]
    practice_talks = [(talk['name'], talk['date'], talk['note'])
                      for talk in currentTerm['practice_talks']]
    half_practices = [(talk['name'], talk['date'], talk['note'])
                      for talk in currentTerm['half_practices']]
    for speaker in struct['speakers']:
        location = struct['speakers'][speaker]
        if triple_check('practice_talks', location):
            practice_talks += {(speaker, talk['date'], talk['note'])
                               for talk in location['practice_talks']}
        if triple_check('half_practices', location):
            half_practices += {(speaker, talk['date'], talk['note'])
                               for talk in location['half_practices']}
    notes = [(note['date'], note['note']) for note in currentTerm['notes']]
    irc_handles = {name: struct['speakers'][name]['irc']
                   for name in struct['speakers']
                   if 'irc' in struct['speakers'][name]}
    return CryspCalendar(currentTerm['start'], currentTerm['end'],
                         names=names, constraints=constraints,
                         practice_talks=practice_talks,
                         half_practices=half_practices,
                         notes=notes, irc_handles=irc_handles)


def make_parser():
    parser = argparse.ArgumentParser(description='''\
Print a speaker schedule for the CrySP weekly meetings.
All dates are ISO formatted (yyyy-mm-dd). Constraints in files can also be
ranges of ISO formatted dates (yyyy-mm-dd--yyyy-mm-dd).''',
                                     epilog='''\
Now that the lab is so large, you likely want to use one of the file options,
probably YAML. The command line options still function if you want to play
with how this script works to learn, though.
The YAML file has the following format:
There are two main objects, a "terms" object that stores data about particular
terms, and a "speakers" ojbect that stores data about the speakers.
The "terms" object contains any number of term objects with any name. Each
term has the following objects:
  start: the date of the first meeting
  end: a date on and beyond which there are no more meetings
  speakers: an ordered list of names for each speaker this term
  out: a list to store lab members who won't speak this term (ignored)
  practice_talks: a list of practice talks, of the form
    {date: _, name: _, note: _}
  half_practices: a list of half practice talks (format is the same)
  notes: notes, of the form
    {date: _, note: _}
The "speakers" object contains any number of speaker objects. The name of each
speaker object should be the same as the name in the speakers list, if they
are speaking this term. The names can have spaces. Each speaker object has
the following objects:
  irc: the IRC handle of the speaker, if they're in CrySP IRC
  email: the email address of the speaker (check the UW whitepages if need be)
  constraints: a list of dates/date ranges the speaker cannot speak on
  practice_talks: a list of practice talks, each of the form:
    {date: _, note: _}
  half_practices: a list of half practice talks (format is the same)
''',
                                     formatter_class=RawTextHelpFormatter)
    parser.add_argument('-y', '--yaml',
                        metavar='FILE',
                        help='full description of the term via YAML file.')
    parser.add_argument('-s', '--start',
                        metavar='DATE',
                        help='date of the first meeting')
    parser.add_argument('-e', '--end', metavar='DATE',
                        help='last date to schedule a meeting on or before\n'
                        '(if -w also specified, uses whatever is shortest)')
    parser.add_argument('-w', '--weeks', type=int,
                        help='number of weeks to schedule for\n'
                        '(if -e also specified, uses whatever is shortest)')

    group = parser.add_mutually_exclusive_group()
    group.add_argument('-n', '--names',
                       nargs='+', default=[], metavar='NAME',
                       help='names to schedule in their speaking order')
    group.add_argument('-f', '--namesfile',
                       metavar='FILE',
                       help='path of a file that contains a comma-seperated\n'
                       'list of names to schedule in their speaking order')

    parser.add_argument('-c', '--constraintsfile',
                        metavar='FILE',
                        help='Provide constraints, practice talks, and notes\n'
                        'via supplied CSV file. The CSV can contain the\n'
                        'following lines:\n'
                        'constraints - dates where someone cannot speak:\n'
                        '"c,[name],[date/range1],[date/range2],[...]"\n'
                        'notes - goes in the notes column for that date:\n'
                        '"n,[date],[note]"\n'
                        'practice talks - dates where something other than\n'
                        'the usual CrySP meeting talks is happening:\n'
                        '"p,[name],[date],[note (e.g., "practice talk")]"\n'
                        'half-slot - a rare case where someone/thing needs\n'
                        'only one of the speaker slots on this date:\n'
                        '"h,[name],[date],[note]"\n')

    parser.add_argument('-r', '--no-repeat',
                        action='store_true',
                        help='disables repeating the list of names')
    parser.add_argument('-E', '--email',
                        nargs='?', const=2, default=False,
                        metavar='WEEKS',
                        help='print an email for notifying who is speaking\n'
                        'the next two (or specified) weeks')
    parser.add_argument('-i', '--irc',
                        action='store_true',
                        help='print names formatted for an irc channel topic')
    parser.add_argument('-d', '--today',
                        default=date.today(), metavar='DATE',
                        help='pretend the script is being run on the day DATE')
    return parser


def old_format(args):
    if args.namesfile:
        with open(args.namesfile, 'r') as f:
            names = [x.strip() for x in f.read().split(',')]
    else:
        names = args.names

    if args.constraintsfile:
        constraints, practice, halves, notes = \
            parse_constraintsfile(args.constraintsfile)
        return CryspCalendar(args.start, args.end, args.weeks, names,
                             constraints, practice, halves, notes,
                             args.no_repeat)
    return CryspCalendar(args.start, args.end, args.weeks, names,
                         no_repeat=args.no_repeat)


def main(argv=None):
    if argv is None:
        argv = sys.argv
    parser = make_parser()
    args = parser.parse_args()

    if not args.end and not args.weeks and not args.yaml:
        parser.error('requires -w/--weeks or -e/--end')

    if not args.yaml:
        cal = old_format(args)
    else:
        cal = parse_yaml(args.yaml)

    today = str_to_date(args.today)
    if args.email:
        print(cal.email(int(args.email), today))
    elif args.irc:
        print(cal.irc(today))
    else:
        print(cal.table(today))
    return 0


if __name__ == '__main__':
    sys.exit(main())