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+% Copyright 2022 by Qrrbrbirlbel
+%
+% This file may be distributed and/or modified
+%
+% 1. under the LaTeX Project Public License and/or
+% 2. under the GNU Free Documentation License.
+%
+\pgfqkeys{/pgf/calendar}{
+ style/.style={#1},
+ yesterday/.value required,
+ yesterday/.code={%
+ \begingroup
+ \pgfutil@tempcnta=\pgfcalendarifdatejulian\relax
+ \advance\pgfutil@tempcnta by -1\relax
+ \pgfcalendarjuliantodate{\pgfutil@tempcnta}{\pgfcalendarifdateyear}{\pgfcalendarifdatemonth}{\pgfcalendarifdateday}%
+ \edef\pgfcalendarifdatejulian{\the\pgfutil@tempcnta}%
+ \pgfcalendarjuliantoweekday\pgfutil@tempcnta\pgfutil@tempcntb
+ \edef\pgfcalendarifdateweekday{\the\pgfutil@tempcntb}%
+ \pgfcalendarjulianyeartoweek\pgfutil@tempcnta\pgfcalendarifdateyear\pgfutil@tempcntb
+ \edef\pgfcalendarifdateweek{\the\pgfutil@tempcntb}%
+ \pgfcalendar@launch@ifdate{#1}{%
+ \def\pgf@cal@temp{\pgfcalendarmatchestrue}%
+ }{%
+ \let\pgf@cal@temp\pgfutil@empty
+ }%
+ \expandafter
+ \endgroup\pgf@cal@temp
+ },
+ Jan/.code={\ifnum\pgfcalendarifdatemonth=1 \expandafter\pgfcalendarmatchestrue\fi},Jan/.value forbidden,
+ Feb/.code={\ifnum\pgfcalendarifdatemonth=2 \expandafter\pgfcalendarmatchestrue\fi},Feb/.value forbidden,
+ Mar/.code={\ifnum\pgfcalendarifdatemonth=3 \expandafter\pgfcalendarmatchestrue\fi},Mar/.value forbidden,
+ Apr/.code={\ifnum\pgfcalendarifdatemonth=4 \expandafter\pgfcalendarmatchestrue\fi},Apr/.value forbidden,
+ May/.code={\ifnum\pgfcalendarifdatemonth=5 \expandafter\pgfcalendarmatchestrue\fi},May/.value forbidden,
+ Jun/.code={\ifnum\pgfcalendarifdatemonth=6 \expandafter\pgfcalendarmatchestrue\fi},Jun/.value forbidden,
+ Jul/.code={\ifnum\pgfcalendarifdatemonth=7 \expandafter\pgfcalendarmatchestrue\fi},Jul/.value forbidden,
+ Aug/.code={\ifnum\pgfcalendarifdatemonth=8 \expandafter\pgfcalendarmatchestrue\fi},Aug/.value forbidden,
+ Sep/.code={\ifnum\pgfcalendarifdatemonth=9 \expandafter\pgfcalendarmatchestrue\fi},Sep/.value forbidden,
+ Oct/.code={\ifnum\pgfcalendarifdatemonth=10 \expandafter\pgfcalendarmatchestrue\fi},Oct/.value forbidden,
+ Nov/.code={\ifnum\pgfcalendarifdatemonth=11 \expandafter\pgfcalendarmatchestrue\fi},Nov/.value forbidden,
+ Dec/.code={\ifnum\pgfcalendarifdatemonth=12 \expandafter\pgfcalendarmatchestrue\fi},Dec/.value forbidden,
+ %
+ difference between/.code args={#1and#2 #3 #4}{%
+ \pgfcalendardatetojulian{#1}\pgfutil@tempcnta
+ \pgfcalendardatetojulian{#2}\pgfutil@tempcntb
+ \advance\pgfutil@tempcntb by -\pgfutil@tempcnta
+ \ifnum\pgfutil@tempcntb#3#4\relax
+ \pgfcalendarmatchestrue
+ \fi},
+ weekday before or same/.code args={#1and#2}{%
+ \pgfcalendarjuliantoweekday{#1}\pgfutil@tempcnta
+ \pgfcalendarjuliantoweekday{#2}\pgfutil@tempcntb
+ \ifnum\pgfutil@tempcntb<\pgfutil@tempcnta
+ \pgfcalendarmatchestrue
+ \fi
+ },
+ leap year/.code={%
+ \pgfutil@tempcnta=#1\relax
+ \divide\pgfutil@tempcnta4
+ \multiply\pgfutil@tempcnta4
+ \ifnum\pgfutil@tempcnta=#1\relax
+ \divide\pgfutil@tempcnta100
+ \multiply\pgfutil@tempcnta100
+ \ifnum\pgfutil@tempcnta=#1\relax
+ \divide\pgfutil@tempcnta400
+ \multiply\pgfutil@tempcnta400
+ \ifnum\pgfutil@tempcnta=#1\relax
+ \pgfcalendarmatchestrue
+ \fi
+ \else
+ \pgfcalendarmatchestrue
+ \fi
+ \fi},
+ leap year/.default=\pgfcalendarifdateyear,
+ between days/.code args={#1and#2}{%
+ \pgfutil@tempcnta=#1\relax
+ \ifnum\pgfcalendarifdateday<\pgfutil@tempcnta\else
+ \pgfutil@tempcnta=#2\relax
+ \ifnum\pgfcalendarifdateday>\pgfutil@tempcnta\else
+ \pgfcalendarmatchestrue\fi\fi},
+ week of month/.code={%
+ \pgfutil@tempcnta=#1\relax
+ \multiply\pgfutil@tempcnta7
+ \ifnum\pgfcalendarifdateday>\pgfutil@tempcnta\else
+ \advance\pgfutil@tempcnta-7
+ \ifnum\pgfcalendarifdateday>\pgfutil@tempcnta
+ \pgfcalendarmatchestrue
+ \fi
+ \fi},
+ week of month'/.code={%
+ \pgfcalendar@getlastYMX\pgfcalendarifdateyear\pgfcalendarifdatemonth\pgfutil@tempcnta
+ \advance\pgfutil@tempcnta1
+ \pgfutil@tempcntb=#1\relax
+ \multiply\pgfutil@tempcntb7
+ \advance\pgfutil@tempcnta-\pgfutil@tempcntb
+ \ifnum\pgfcalendarifdateday<\pgfutil@tempcnta\else
+ \advance\pgfutil@tempcnta+7
+ \ifnum\pgfcalendarifdateday<\pgfutil@tempcnta
+ \pgfcalendarmatchestrue
+ \fi
+ \fi},
+ first/.code={\pgfutil@in@:{#1}\ifpgfutil@in@
+ \pgfcalendar@ifdate@first{}#1\pgf@stop\else
+ \pgfcalendar@ifdate@first{}1:#1\pgf@stop\fi},
+ last/.code={\pgfutil@in@:{#1}\ifpgfutil@in@
+ \pgfcalendar@ifdate@first'#1\pgf@stop\else
+ \pgfcalendar@ifdate@first'1:#1\pgf@stop\fi},
+ % logic
+ not/.value required,
+ not/.code=%
+ \begingroup
+ \let\pgf@cal@tempa\pgfutil@empty
+ \pgfcalendar@launch@ifdate{#1}{}{\def\pgf@cal@tempa{\pgfcalendarmatchestrue}}%
+ \expandafter\endgroup\pgf@cal@tempa,
+ and/.value required,
+ and/.code=% and = {<cond 1>, <cond 2>, <cond 3>, …}
+ \begingroup
+ \pgfcalendarmatchestrue
+ \pgfqkeys{/pgf/calendar/and}{#1}%
+ \ifpgfcalendarmatches % is it still true?
+ \expandafter\pgfutil@firstoftwo
+ \else
+ \expandafter\pgfutil@secondoftwo
+ \fi
+ {\def\pgf@cal@temp{\pgfcalendarmatchestrue}}%
+ {\let\pgf@cal@temp\pgfutil@empty}%
+ \expandafter\endgroup\pgf@cal@temp,
+ and/.unknown/.code=% only inside the group of and/.code
+ \ifpgfcalendarmatches
+ \expandafter\pgfutil@firstofone
+ \else
+ \expandafter\pgfutil@gobble
+ \fi
+ {%
+ \begingroup
+ \pgfcalendar@launch@ifdate{\pgfkeyscurrentname={#1}}%
+ {\let\pgf@cal@temp\pgfutil@empty}{\def\pgf@cal@temp{\pgfcalendarmatchesfalse}}
+ \expandafter\endgroup\pgf@cal@temp
+ }%
+}
+
+\def\pgfcalendar@ifdate@first#1#2:#3\pgf@stop{%
+ \pgfqkeys{/pgf/calendar}{and={#3, week of month#1={#2}}}}
+\def\pgfcalendar@getlastYMX#1#2#3{% #1 = year, #2 = month, #3 := last day
+ \begingroup
+ \ifnum#2=2 % stupid February
+ \pgfcalendarmatchesfalse
+ \pgfqkeys{/pgf/calendar}{leap year={#1}}%
+ \ifpgfcalendarmatches
+ #3=29
+ \else
+ #3=28
+ \fi
+ \else
+ #3=\ifcase#2\relax\or
+ 31\or\or31\or30\or31\or30\or31\or31\or30\or31\or30\or31\fi
+ \fi
+ \edef\pgf@cal@temp{#3=\the#3\relax}
+ \expandafter
+ \endgroup\pgf@cal@temp}
+
+%
+% weeks
+%
+\def\pgfcalendar@week@setup#1{%
+ \pgfutil@IfUndefined{pgfcalendar@week@#1}{%
+ \begingroup
+ \pgfcalendardatetojulian{#1-01-01}\pgfutil@tempcnta
+ \pgfcalendarjuliantoweekday\pgfutil@tempcnta\pgfutil@tempcntb
+ %
+ % tempcnta holds the julian number for first day of the current year
+ % tempcntb holds the weekday for the first day of the current year
+ %
+ % set tempcnta to the Monday of the week with first day of current year
+ \advance\pgfutil@tempcnta by -\pgfutil@tempcntb
+ %
+ % if the first week starts at Fri, Sat or Sun, next week is the 1st week
+ \ifnum\pgfutil@tempcntb>3\relax
+ \advance\pgfutil@tempcnta by 7\relax
+ \fi
+ % setup macro for year with {Julian number for day of first week}{weekday of -01-01}
+ \edef\pgf@cal@temp{\def\expandafter\noexpand\csname pgfcalendar@week@#1\endcsname
+ {{\the\pgfutil@tempcnta}{\the\pgfutil@tempcntb}}}%
+ \expandafter\endgroup\pgf@cal@temp
+ }{}%
+}
+
+\def\pgfcalendarjulianyeartoweek#1#2#3{\pgfcalendarjulianyeartoweek@{#1}{#2}{#3}{\iftrue}}
+\def\pgfcalendarjulianyeartoweek@#1#2#3#4{%
+ % #1 = julian date (count)
+ % #2 = year
+ % #3 = count that holds the week at the end
+ % #4 = \iftrue or \iffalse: whether week 53 needs to be checked (\iffalse when determing week from next year)
+ \begingroup
+ \pgfcalendar@week@setup{#2}%
+ #3=#1\relax
+ %
+ % calculate difference of days between current date and start of week 1
+ %
+ \advance#3 by -\expandafter\expandafter\expandafter\pgfutil@firstoftwo\csname pgfcalendar@week@#2\endcsname\relax
+ \ifnum#3<0\relax % whoops, we are in the week of the previous year
+ \expandafter\pgfutil@firstoftwo
+ \else
+ \expandafter\pgfutil@secondoftwo
+ \fi
+ {% if first day of the year is Fri, Sat or Sun
+ \ifnum\expandafter\expandafter\expandafter\pgfutil@secondoftwo\csname pgfcalendar@week@#2\endcsname>3\relax
+ \expandafter\pgfutil@firstoftwo
+ \else
+ \expandafter\pgfutil@secondoftwo
+ \fi
+ {% we need to check the week of the previous year
+ #3=#2\relax
+ \advance#3 by -1
+ \edef\pgf@cal@temp{\noexpand\pgfcalendarjulianyeartoweek@#1{\the#3}#3\noexpand\iffalse}%
+ \pgf@cal@temp
+ }{% yeah, it's weird
+ \divide#3 by 7
+ \advance#3 by 1
+ }
+ }{%
+ \divide#3 by 7
+ \advance#3 by 1
+ #4%
+ \expandafter\pgfutil@firstofone
+ \else
+ \expandafter\pgfutil@gobble
+ \fi
+ {%
+ \ifnum#3=53\relax % whoops, we are possibly in the first week of the next year
+ \expandafter\pgfutil@firstofone
+ \else
+ \expandafter\pgfutil@gobble
+ \fi
+ {%
+ \begingroup
+ % check whether we're already in week 1 of the next year
+ #3=#2\relax
+ \advance#3 by 1
+ \expandafter\pgfcalendar@week@setup\expandafter{\the#3}%
+ \ifnum#1<\expandafter\expandafter\expandafter\pgfutil@firstoftwo\csname pgfcalendar@week@\the#3\endcsname\relax
+ #3=53
+ \else
+ #3=1
+ \fi
+ \expandafter
+ \endgroup\expandafter#3\the#3\relax
+ }%
+ }%
+ }%
+ \expandafter
+ \endgroup\expandafter
+ #3\the#3\relax
+}
+
+%
+% shorthands for weeks (n)
+%
+% n-: shortest
+% n=: shortest but prepends whitespace
+% n0: leading zero
+%
+\expandafter\def\csname pgfcalendar@shorthand@n-\endcsname{%
+ \if0\pgfcalendarcurrentweek\else\pgfcalendarcurrentweek\fi}
+\expandafter\def\csname pgfcalendar@shorthand@n=\endcsname{%
+ {\pgfutil@tempcnta=\pgfcalendarcurrentweek\relax\ifnum\pgfutil@tempcnta<10\relax\setbox0=\hbox{1}\kern\wd0\relax\fi\the\pgfutil@tempcnta}}
+\expandafter\def\csname pgfcalendar@shorthand@n0\endcsname{%
+ \pgfcalendarcurrentweek}
+
+%
+% Overwriting original \pgfcalendar
+%
+\long\def\pgfcalendar#1#2#3#4{%
+ \begingroup%
+ % Setup local \ifdate
+ \let\ifdate=\pgfcalendar@local@ifdate%
+ % Let's start with computing start and end dates...
+ \def\pgfcalendarprefix{#1}%
+ \pgfcalendardatetojulian{#2}{\pgfcalendarcurrentjulian}%
+ \edef\pgfcalendarbeginjulian{\the\pgfcalendarcurrentjulian}%
+ \edef\pgfcalendarbeginiso{#2}%
+ \pgfcalendardatetojulian{#3}{\pgfutil@tempcnta}%
+ \edef\pgfcalendarendjulian{\the\pgfutil@tempcnta}%
+ \advance\pgfutil@tempcnta by1\relax%
+ \edef\pgfcalendarendjulianplus{\the\pgfutil@tempcnta}%
+ \edef\pgfcalendarendiso{#3}%
+ %
+ % Start main loop
+ %
+ \loop%
+ \ifnum\pgfcalendarcurrentjulian<\pgfcalendarendjulianplus\relax%
+ % Setup information about current date
+ \pgfcalendarjuliantodate{\pgfcalendarcurrentjulian}%
+ {\pgfcalendarcurrentyear}{\pgfcalendarcurrentmonth}{\pgfcalendarcurrentday}%
+ \pgfcalendarjuliantoweekday{\pgfcalendarcurrentjulian}{\pgfutil@tempcntb}%
+ \edef\pgfcalendarcurrentweekday{\the\pgfutil@tempcntb}%
+ \pgfcalendarjulianyeartoweek{\pgfcalendarcurrentjulian}{\pgfcalendarcurrentyear}{\pgfutil@tempcntb}%
+ \edef\pgfcalendarcurrentweek{\ifnum\pgfutil@tempcntb<10 0\fi\the\pgfutil@tempcntb}%
+ % Render:
+ #4%
+ % Advance day:
+ \advance\pgfcalendarcurrentjulian by1\relax%
+ \repeat%
+ \endgroup%
+}
+
+%
+% Overwriting original \pgfcalendar@local@ifdate
+%
+\def\pgfcalendar@local@ifdate{%
+ \let\pgfcalendarifdatejulian=\pgfcalendarcurrentjulian
+ \let\pgfcalendarifdateyear=\pgfcalendarcurrentyear
+ \let\pgfcalendarifdatemonth=\pgfcalendarcurrentmonth
+ \let\pgfcalendarifdateday=\pgfcalendarcurrentday
+ \let\pgfcalendarifdateweekday=\pgfcalendarcurrentweekday
+ \let\pgfcalendarifdateweek=\pgfcalendarcurrentweek
+ \pgfcalendar@launch@ifdate%
+}
+
+\pgfqkeys{/pgf/calendar/week}{.value required,.code=\ifnum#1=\pgfcalendarifdateweek\relax\expandafter\pgfcalendarmatchestrue\fi}
+
+% Overwriting shorthands of pgfcalendar
+\expandafter\def\csname pgfcalendar@shorthand@d-\endcsname{%
+ \if0\pgfcalendarcurrentday\else\pgfcalendarcurrentday\fi}
+\expandafter\def\csname pgfcalendar@shorthand@m-\endcsname{%
+ \if0\pgfcalendarcurrentmonth\else\pgfcalendarcurrentmonth\fi}
+
+\endinput \ No newline at end of file