Regularly store stats snapshots to track historical trends.

Fixes #37

plugins/wporg-5ftf/views/list-stats.php

@@ -0,0 +1,54 @@
+<?php
+
+namespace WordPressDotOrg\FiveForTheFuture\View;
+use WP_Post;
+
+defined( 'WPINC' ) || die();
+
+/**
+ * @var WP_Post[] $stat_values
+ */
+
+?>
+
+<p>
+	This is just rough text-based output to check that it's working in a way that will be friendly for the vizualization that will be added in #38 (and a11y fallbacks, if any are needed).
+</p>
+
+<p>
+	When that is implemented, the controller can add the data to a JSON array with `date` => `value` entries, or whatever the visualization library wants, rather than looping through it below.
+</p>
+
+<?php
+
+/*
+Label the h3s w/ full text descriptions instead of slugs. rough ones:
+	number of total pledged hours across all companies/teams/etc
+	number of people contributing (regardless of how many hours
+	number of companies contributing (regardless of how many hours
+	# of contributors sponsored for each team
+
+how to visualize teams? maybe a dropdown w/ each team, so not a huge long list of chart for each
+*/
+
+?>
+
+<ul>
+	<?php foreach ( $stat_values as $label => $values ) : ?>
+		<h3>
+			<?php echo esc_html( $label ); ?>
+		</h3>
+
+		<?php foreach ( $values as $timestamp => $value ) : ?>
+			<li>
+				<?php echo esc_html( $timestamp ); ?> -
+
+				<?php if ( is_array( $value ) ) : ?>
+					<?php echo esc_html( print_r( $value, true ) ); ?>
+				<?php else : ?>
+					<?php echo esc_html( $value ); ?>
+				<?php endif; ?>
+			</li>
+		<?php endforeach; ?>
+	<?php endforeach; ?>
+</ul>