Fix linking when year spans multiple calendar years

Follow-up to 7dfecd8
And #4

generators/generator.php

@@ -46,7 +46,7 @@ protected static function get_day_entry_anchor( \DateTimeImmutable $date ) : str
  }
 
  protected static function get_month_overview_anchor( \DateTimeImmutable $date ) : string {
- return $date->format( 'F' ) . '-overview';
+ return $date->format( 'dmY' ) . '-month-overview';
  }
 
  protected static function get_week_overview_anchor( \DateTimeImmutable $date ) : string {

recalendar.php

@@ -43,7 +43,7 @@ public function generate() {
  $period = new \DatePeriod( $start, $interval, $end );
 
  foreach( $period as $week ) {
- $this->generate_week( $week );
+ $this->generate_week( $week, $end );
 
  $this->write_html();
  }
@@ -56,10 +56,10 @@ private function generate_title_page() : void {
  $this->append_html( $title_page_generator->generate() );
  }
 
- private function generate_week( \DateTimeImmutable $week ) : void {
+ private function generate_week( \DateTimeImmutable $week, \DateTimeImmutable $year_end ) : void {
  $this->generate_week_overview( $week );
 
- $this->generate_days_per_week( $week );
+ $this->generate_days_per_week( $week, $year_end );
 
  $this->generate_week_retrospective( $week );
  }
@@ -86,12 +86,11 @@ private function generate_week_overview( \DateTimeImmutable $week ) : void {
  $this->append_html( $week_overview_generator->generate() );
  }
 
- private function generate_days_per_week( \DateTimeImmutable $week ) : void {
- $year = $this->config->get( Config::YEAR );
+ private function generate_days_per_week( \DateTimeImmutable $week, \DateTimeImmutable $year_end ) : void {
  $next_week = $week->modify( 'next week' );
  $week_period = new \DatePeriod( $week, new \DateInterval( 'P1D' ), $next_week );
  foreach( $week_period as $week_day ) {
- if ( (int) $week_day->format( 'j' ) === 1 && (int) $week_day->format( 'Y' ) === $year ) {
+ if ( (int) $week_day->format( 'j' ) === 1 && $week_day < $year_end ) {
  $this->generate_month_overview( $week_day );
  }