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153 lines
4.3 KiB
Python
153 lines
4.3 KiB
Python
###############################
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# Calendar printing functions #
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###############################
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# Revision 2: uses funtions from built-in time module
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# Import functions and variables from time module
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from time import gmtime, localtime, mktime, asctime, ctime
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# Exception raised for bad input (with string parameter for details)
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error = 'calendar.error'
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# Note when comparing these calendars to the ones printed by cal(1):
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# My calendars have Monday as the first day of the week, and Sunday as
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# the last! (I believe this is the European convention.)
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# Constants for months referenced later
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January = 1
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February = 2
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# Number of days per month (except for February in leap years)
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mdays = [0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
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# Full and abbreviated names of weekdays
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day_name = ['Monday', 'Tuesday', 'Wednesday', 'Thursday', \
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'Friday', 'Saturday', 'Sunday']
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day_abbr = ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
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# Full and abbreviated names of months (1-based arrays!!!)
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month_name = ['', 'January', 'February', 'March', 'April', \
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'May', 'June', 'July', 'August', \
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'September', 'October', 'November', 'December']
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month_abbr = [' ', 'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', \
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'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
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# Return 1 for leap years, 0 for non-leap years
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def isleap(year):
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return year % 4 == 0 and (year % 100 <> 0 or year % 400 == 0)
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# Return number of leap years in range [y1, y2)
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# Assume y1 <= y2 and no funny (non-leap century) years
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def leapdays(y1, y2):
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return (y2+3)/4 - (y1+3)/4
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# Return weekday (0-6 ~ Mon-Sun) for year (1970-...), month (1-12), day (1-31)
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def weekday(year, month, day):
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secs = mktime((year, month, day, 0, 0, 0, 0, 0, 0))
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tuple = localtime(secs)
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return tuple[6]
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# Return weekday (0-6 ~ Mon-Sun) and number of days (28-31) for year, month
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def monthrange(year, month):
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if not 1 <= month <= 12: raise ValueError, 'bad month number'
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day1 = weekday(year, month, 1)
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ndays = mdays[month] + (month == February and isleap(year))
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return day1, ndays
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# Return a matrix representing a month's calendar
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# Each row represents a week; days outside this month are zero
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def _monthcalendar(year, month):
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day1, ndays = monthrange(year, month)
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rows = []
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r7 = range(7)
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day = 1 - day1
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while day <= ndays:
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row = [0, 0, 0, 0, 0, 0, 0]
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for i in r7:
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if 1 <= day <= ndays: row[i] = day
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day = day + 1
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rows.append(row)
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return rows
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# Caching interface to _monthcalendar
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_mc_cache = {}
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def monthcalendar(year, month):
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key = (year, month)
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if _mc_cache.has_key(key):
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return _mc_cache[key]
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else:
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_mc_cache[key] = ret = _monthcalendar(year, month)
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return ret
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# Center a string in a field
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def _center(str, width):
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n = width - len(str)
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if n <= 0: return str
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return ' '*((n+1)/2) + str + ' '*((n)/2)
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# XXX The following code knows that print separates items with space!
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# Print a single week (no newline)
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def prweek(week, width):
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for day in week:
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if day == 0: s = ''
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else: s = `day`
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print _center(s, width),
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# Return a header for a week
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def weekheader(width):
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str = ''
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if width >= 9: names = day_name
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else: names = day_abbr
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for i in range(7):
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if str: str = str + ' '
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str = str + _center(names[i%7][:width], width)
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return str
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# Print a month's calendar
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def prmonth(year, month, w = 0, l = 0):
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w = max(2, w)
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l = max(1, l)
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print _center(month_name[month] + ' ' + `year`, 7*(w+1) - 1),
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print '\n'*l,
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print weekheader(w),
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print '\n'*l,
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for week in monthcalendar(year, month):
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prweek(week, w)
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print '\n'*l,
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# Spacing of month columns
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_colwidth = 7*3 - 1 # Amount printed by prweek()
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_spacing = ' '*4 # Spaces between columns
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# 3-column formatting for year calendars
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def format3c(a, b, c):
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print _center(a, _colwidth),
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print _spacing,
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print _center(b, _colwidth),
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print _spacing,
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print _center(c, _colwidth)
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# Print a year's calendar
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def prcal(year):
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header = weekheader(2)
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format3c('', `year`, '')
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for q in range(January, January+12, 3):
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print
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format3c(month_name[q], month_name[q+1], month_name[q+2])
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format3c(header, header, header)
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data = []
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height = 0
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for month in range(q, q+3):
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cal = monthcalendar(year, month)
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if len(cal) > height: height = len(cal)
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data.append(cal)
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for i in range(height):
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for cal in data:
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if i >= len(cal):
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print ' '*_colwidth,
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else:
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prweek(cal[i], 2)
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print _spacing,
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print
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