Implement call for shows feature

Add display_call_for_shows MACRO. Update index template to include
call to display_call_for_shows.

templates/content-index.tpl.html

@@ -1,6 +1,7 @@
 <!--% PROCESS 'shared-avatar.tpl.html' %-->
 <!--% PROCESS 'shared-utils.tpl.html' %-->
 <!--% PROCESS 'shared-listen-now.tpl.html' %-->
+<!--% PROCESS 'shared-call_for_shows.tpl.html' %-->
 <!--% INCLUDE 'content-index-announcement.tpl.html' %-->
 <hr>
   <article>
@@ -31,7 +32,10 @@
 	<!--% USE date %-->  
 	<!--% delta = date.calc.N_Delta_YMD(2005,9,19, date.format(date.now, '%Y'),date.format(date.now, '%m'),date.format(date.now, '%d')) %-->
 	<p>We started producing shows as <a href="<!--% absolute_path(baseurl) %-->eps/index.html#twat_episodes"><em>Today with a Techie</em></a> on 2005-09-19, <!--% delta.0 %--> years, <!--% delta.1 %--> months, <!--% delta.2 %--> days ago. our shows are produced by <a href="<!--% absolute_path(baseurl) %-->correspondents/index.html">listeners</a> like you and can be on any <a href="<!--% absolute_path(baseurl) %-->eps/index.html">topic</a> that <strong>"are of interest to <a href="https://en.wikipedia.org/wiki/hacker_(hobbyist)">hackers</a>"</strong>. if you listen to HPR then please consider contributing one show a year. if you <a href="<!--% absolute_path(baseurl) %-->contribute.html">record</a> your show now it could be <a href="https://www.hackerpublicradio.org/calendar.php">released</a> in <strong><!--% days_till_next_episode %--></strong> days.</p>
-    <h4>Meet the team</h4>
+  </article>
+  <!--% display_call_for_shows() %-->
+  <article>
+  <h4>Meet the team</h4>
     <p>
     <audio controls preload="none">";
         <source src="<!--% absolute_path(baseurl) %-->media/promos/all-hpr-hosts.ogg" type="audio/ogg" >

templates/shared-call_for_shows.tpl.html

@@ -0,0 +1,21 @@
+<!--% PROCESS 'shared-utils.tpl.html' %-->
+<!--% MACRO display_call_for_shows BLOCK %-->
+	<!--% query_call_for_shows = DBI.prepare('
+		SELECT CASE WHEN COUNT(id) < 7 THEN True ELSE False END AS `request_for_shows`
+		FROM eps
+		WHERE eps.date > date(\'now\') AND eps.date < date(\'now\', \'+10 days\')
+		')
+	%-->
+	<!--% results_call_for_shows = query_call_for_shows.execute().get_all() %-->
+		<!--% IF results_call_for_shows.0.request_for_shows == 1 %-->
+	<!--% USE date %-->
+	<article>
+		<header>
+			<h3>Call for shows</h3>
+		</header>
+		<p><strong><em>We are running very low on shows</em></strong> at the moment. Have a look at the <a href="<!--% absolute_path(baseurl) %-->correspondents/index.html">hosts</a> page and if you don't see "<!--% date.format(date.now, '%Y') %-->-??-??" next to your name, or if your name is not listed, you might consider sending us in something.</p>
+		<!--     <img src="/images/hprstats.png" alt="hpr queue showing an graph showing how few shows we have" /> -->
+		<p>There are no files to process on the FTP server.</p>
+	</article>
+	<!--% END %-->
+<!--% END %-->