Text::Calendar

Raku package with text calendar functions for displaying monthly, yearly, and custom calendars.

Motivation

• For data science applications I need sparse calendars that contain only some of the dates

• I want to facilitate making and displaying calendars in Jupyter notebooks using Markdown and HTML layouts

• I like the "transposed" calendar layout of UNIX' ncal

• I am interested in comparisons of calendar making (i) with LLM applications, and (ii) in the "hard way"

Alternative implementations

• "App::Cal", [WCp1].

• "Calendar", [TBp1].

Compared to [WCp1] and [TBp1], this package, "Text::Calendar", is lightweight and with no dependencies.

Extensions

The package "Markup::Calendar", [AAp2], provides calendars in HTML and Markdown formats.

Installation

From Zef ecosystem:

zef install Text::Calendar

From GitHub:

zef install https://github.com/antononcube/Raku-Text-Calendar.git

Examples

Emacs style: this month with ones before and after

Load the package and show today's date:

use Text::Calendar;
Date.today;

# 2024-02-09

Default, "Emacs style" calendar:

calendar();

# January                February               March                  
# Mo Tu We Th Fr Sa Su   Mo Tu We Th Fr Sa Su   Mo Tu We Th Fr Sa Su   
#  1  2  3  4  5  6  7             1  2  3  4                1  2  3   
#  8  9 10 11 12 13 14    5  6  7  8  9 10 11    4  5  6  7  8  9 10   
# 15 16 17 18 19 20 21   12 13 14 15 16 17 18   11 12 13 14 15 16 17   
# 22 23 24 25 26 27 28   19 20 21 22 23 24 25   18 19 20 21 22 23 24   
# 29 30 31               26 27 28 29            25 26 27 28 29 30 31

Compare the output above with the that of UNIX (macOS) function cal:

cal -3 -h

# 2024
#       January               February               March          
# Su Mo Tu We Th Fr Sa  Su Mo Tu We Th Fr Sa  Su Mo Tu We Th Fr Sa  
#     1  2  3  4  5  6               1  2  3                  1  2  
#  7  8  9 10 11 12 13   4  5  6  7  8  9 10   3  4  5  6  7  8  9  
# 14 15 16 17 18 19 20  11 12 13 14 15 16 17  10 11 12 13 14 15 16  
# 21 22 23 24 25 26 27  18 19 20 21 22 23 24  17 18 19 20 21 22 23  
# 28 29 30 31           25 26 27 28 29        24 25 26 27 28 29 30  
#                                             31

Here is the "transposed" version (or UNIX ncal style):

say "ncal style:\n", calendar(:transposed);

# ncal style:
#     January 2024    February 2024   March 2024      
# Mo  1  8 15 22 29      5 12 19 26      4 11 18 25   
# Tu  2  9 16 23 30      6 13 20 27      5 12 19 26   
# We  3 10 17 24 31      7 14 21 28      6 13 20 27   
# Th  4 11 18 25      1  8 15 22 29      7 14 21 28   
# Fr  5 12 19 26      2  9 16 23      1  8 15 22 29   
# Sa  6 13 20 27      3 10 17 24      2  9 16 23 30   
# Su  7 14 21 28      4 11 18 25      3 10 17 24 31

Yearly

calendar-year(2024, per-row=>6)

# 2024
# 
# January                February               March                  April                  May                    June                   
# Mo Tu We Th Fr Sa Su   Mo Tu We Th Fr Sa Su   Mo Tu We Th Fr Sa Su   Mo Tu We Th Fr Sa Su   Mo Tu We Th Fr Sa Su   Mo Tu We Th Fr Sa Su   
#  1  2  3  4  5  6  7             1  2  3  4                1  2  3    1  2  3  4  5  6  7          1  2  3  4  5                   1  2   
#  8  9 10 11 12 13 14    5  6  7  8  9 10 11    4  5  6  7  8  9 10    8  9 10 11 12 13 14    6  7  8  9 10 11 12    3  4  5  6  7  8  9   
# 15 16 17 18 19 20 21   12 13 14 15 16 17 18   11 12 13 14 15 16 17   15 16 17 18 19 20 21   13 14 15 16 17 18 19   10 11 12 13 14 15 16   
# 22 23 24 25 26 27 28   19 20 21 22 23 24 25   18 19 20 21 22 23 24   22 23 24 25 26 27 28   20 21 22 23 24 25 26   17 18 19 20 21 22 23   
# 29 30 31               26 27 28 29            25 26 27 28 29 30 31   29 30                  27 28 29 30 31         24 25 26 27 28 29 30   
# 
# July                   August                 September              October                November               December               
# Mo Tu We Th Fr Sa Su   Mo Tu We Th Fr Sa Su   Mo Tu We Th Fr Sa Su   Mo Tu We Th Fr Sa Su   Mo Tu We Th Fr Sa Su   Mo Tu We Th Fr Sa Su   
#  1  2  3  4  5  6  7             1  2  3  4                      1       1  2  3  4  5  6                1  2  3                      1   
#  8  9 10 11 12 13 14    5  6  7  8  9 10 11    2  3  4  5  6  7  8    7  8  9 10 11 12 13    4  5  6  7  8  9 10    2  3  4  5  6  7  8   
# 15 16 17 18 19 20 21   12 13 14 15 16 17 18    9 10 11 12 13 14 15   14 15 16 17 18 19 20   11 12 13 14 15 16 17    9 10 11 12 13 14 15   
# 22 23 24 25 26 27 28   19 20 21 22 23 24 25   16 17 18 19 20 21 22   21 22 23 24 25 26 27   18 19 20 21 22 23 24   16 17 18 19 20 21 22   
# 29 30 31               26 27 28 29 30 31      23 24 25 26 27 28 29   28 29 30 31            25 26 27 28 29 30      23 24 25 26 27 28 29

Remark: The command used above has the same effect as calendar-year(per-row=>6). I.e. the first, year argument can be Whatever and the current year be "deduced" as Date.today.year.

Specific year-month pairs

calendar([2022=>2, 2023=>11, 2024 => 2])

# February               November               February               
# Mo Tu We Th Fr Sa Su   Mo Tu We Th Fr Sa Su   Mo Tu We Th Fr Sa Su   
#     1  2  3  4  5  6          1  2  3  4  5             1  2  3  4   
#  7  8  9 10 11 12 13    6  7  8  9 10 11 12    5  6  7  8  9 10 11   
# 14 15 16 17 18 19 20   13 14 15 16 17 18 19   12 13 14 15 16 17 18   
# 21 22 23 24 25 26 27   20 21 22 23 24 25 26   19 20 21 22 23 24 25   
# 28                     27 28 29 30            26 27 28 29

Month dataset

Using month dataset allows of utilizing HTML formatting in Markdown files or Jupyter notebooks.

Here is an example using "Data::Translators", [AAp2]:

use Data::Translators;
my $m = 'February';
my $res = to-html(calendar-month-dataset(2024, $m), field-names => calendar-weekday-names);
'<h4>' ~ $m ~ '</h4>' ~ $res.subst('<td>7</td>', '<td><span style="color: red"><b>7</b></span></td>')

Remark: The package "Markup::Calendar", [AAp1], provides extensions of "Text::Calendar" for getting calendars in HTML and Markdown formats.

Implementation notes

The initial codes for calendar-month-block and calendar were taken from https://rosettacode.org/wiki/Calendar#Raku .

The modifications done are for:

• Different signatures for making calendars

• Using of specs that are lists of year-month pairs

• Have the transposed, ncal style layout

Significant modifications are expected for calendars based on ranges of days. (The lists can be both dense or sparse.)

TODO

• Features

  • DONE Month block string

  • DONE Yearly calendar

  • DONE Calendar for span of months

    • I.e. "Emacs style"

  • DONE Calendar for a spec that is a list of year-month pairs

  • TODO Sparse calendar

    • Only for specified days

    • Days are specified with a list

  • DONE transposed or ncal mode

  • DONE Month block dataset

  • TODO Language localization

    • Using the short names of weekdays in "Date::Names", [TBp2]

    • Specified first day of week (e.g. Monday, not Sunday)

  • TODO Make sure month blocks align in multi-row layouts

    • Like, year calendars

    • For transposed only

  • TODO Return a list of pairs with year-month keys and month-text-block keys

    • Using adverb :pairs

• Unit tests

  • DONE Sanity / signatures

  • TODO Correctness

    • Monthly

    • Yearly

    • Span

• Documentation

  • DONE Basic README

  • DONE Detailed usage messages

  • TODO Comparison with LLMs

References

[AAp1] Anton Antonov, Markup::Calendar Raku package, (2024), GitHub/antononcube.

[AAp2] Anton Antonov, Data::Translators Raku package, (2023), GitHub/antononcube.

[TBp1] Tom Browder, Calendar Raku package, (2020-2024), GitHub/tbrowder.

[TBp2] Tom Browder, Date::Names Raku package, (2019-2024), GitHub/tbrowder.

[WCp1] Will Coleda, App::Cal Raku package, (2022-2024), GitHub/coke.