firehose fixes and optimisations. In particular get rid of the unresponsive script warning when trying to load updates (sine they aren't our posts, we can't check for unseen, hence we can't really load updates). Also make the url selection pluggable.

include/externals.php

@@ -0,0 +1,54 @@
+<?php /** @file */
+
+require_once('boot.php');
+require_once('include/cli_startup.php');
+require_once('include/zot.php');
+require_once('include/identity.php');
+
+function externals_run($argv, $argc){
+
+	cli_startup();
+	$a = get_app();
+
+
+	// pull in some public posts
+
+	$arr = array('url' => '');
+	call_hooks('externals_url_select',$arr);
+
+	if($arr['url']) {
+		$url = $arr['url'];
+	} 
+	else {
+		$r = q("select site_url from site where site_url != '%s'  order by rand() limit 1",
+			dbesc(z_root())
+		);
+		if($r)
+			$url = $r[0]['site_url'];
+	}
+
+	if($url) {
+		$feedurl = $url . '/zotfeed?f=&mindate=' . urlencode(datetime_convert('','','now - 15 days'));
+		$x = z_fetch_url($feedurl);
+
+		if(($x) && ($x['success'])) {
+			$total = 0;
+			$j = json_decode($x['body'],true);
+			if($j['success'] && $j['messages']) {
+				$sys = get_sys_channel();
+				foreach($j['messages'] as $message) {
+					$results = process_delivery(array('hash' => 'undefined'), get_item_elements($message),
+						array(array('hash' => $sys['xchan_hash'])), false, true);
+					$total ++;
+				}
+				logger('import_public_posts: ' . $total . ' messages imported', LOGGER_DEBUG);
+			}
+		}
+	}
+
+}
+
+if (array_search(__file__,get_included_files())===0){
+  externals_run($argv,$argc);
+  killme();
+}