Extend OPML preferences pane, to provide more control of Export OPML

User is prompted for filename, and also whether to include settings.
    Default filename is: TinyTinyRSS.opml

    modules/pref-feeds.php
        Prompt for output OPML filename (Default: TinyTinyRSS.opml )
    opml.php
        Modify to support passing in name=<filename>&settings=[0|1]
    functions.js
        Modify to support passing in name=<filename>&settings=[0|1]

functions.js

@@ -277,8 +277,9 @@ function gotoMain() {
 	document.location.href = "tt-rss.php";
 }
 
-function gotoExportOpml() {
-	document.location.href = "opml.php?op=Export";
+function gotoExportOpml(filename, settings) {
+    tmp = settings ? 1 : 0;
+	document.location.href = "opml.php?op=Export&filename=" + filename + "&settings=" + tmp;
 }
 
 

modules/pref-feeds.php

@@ -1440,16 +1440,21 @@
 			name=\"upload_iframe\" onload=\"opmlImportComplete(this)\"
 			style=\"width: 400px; height: 100px; display: none;\"></iframe>";
 
-		print "<form style='display : block' target=\"upload_iframe\"
+		print "<form  name=\"opml_form\" style='display : block' target=\"upload_iframe\"
 			enctype=\"multipart/form-data\" method=\"POST\"
 				action=\"backend.php\">
 			<input id=\"opml_file\" name=\"opml_file\" type=\"file\">&nbsp;
 			<input type=\"hidden\" name=\"op\" value=\"dlg\">
 			<input type=\"hidden\" name=\"id\" value=\"importOpml\">
-			<button dojoType=\"dijit.form.Button\" onclick=\"return opmlImport();\"
-				type=\"submit\">".__('Import')."</button>
-			<button dojoType=\"dijit.form.Button\" onclick=\"gotoExportOpml()\">".__('Export OPML')."</button>
-			</form>";
+			<button dojoType=\"dijit.form.Button\" onclick=\"return opmlImport();\" type=\"submit\">" .
+              __('Import') . "</button>" .
+            "<p>" . __('Export Name:&nbsp;') .
+            "<input type=\"text\" id=\"filename\" value=\"TinyTinyRSS.opml\" />&nbsp;" .
+            __('Include Settings?&nbsp;') . "<input type=\"checkbox\" id=\"settings\" CHECKED />" .
+
+			"<button dojoType=\"dijit.form.Button\"
+			onclick=\"gotoExportOpml(document.opml_form.filename.value, document.opml_form.settings.checked)\" >" .
+              __('Export OPML') . "</button></p></form>";
 
 		print "<p>".__('Your OPML can be published publicly and can be subscribed by anyone who knows the URL below.');
 

opml.php

@@ -10,12 +10,14 @@
 
 	init_connection($link);
 
-	function opml_export($link, $owner_uid, $hide_private_feeds=false, $include_settings=true) {
+	function opml_export($link, $name, $owner_uid, $hide_private_feeds=false, $include_settings=true) {
 		if (!$_REQUEST["debug"]) {
 			header("Content-type: application/xml+opml");
 		} else {
 			header("Content-type: text/xml");
 		}
+        header("Content-Disposition: attachment; filename=" . $name );
+
 		print "<?xml version=\"1.0\" encoding=\"utf-8\"?>";
 
 		print "<opml version=\"1.0\">";
@@ -119,14 +121,18 @@
 	// FIXME there are some brackets issues here
 
 	$op = $_REQUEST["op"];
+    if (!$op) $op = "Export";
+
+    $output_name = $_REQUEST["filename"];
+	if (!$output_name) $output_name = "TinyTinyRSS.opml";
 
-	if (!$op) $op = "Export";
+    $show_settings = $_REQUEST["settings"];
 
 	if ($op == "Export") {
 
 		login_sequence($link);
 		$owner_uid = $_SESSION["uid"];
-		return opml_export($link, $owner_uid);
+		return opml_export($link, $output_name, $owner_uid, false, ($show_settings == 1));
 	}
 
 	if ($op == "publish"){
@@ -138,7 +144,7 @@
 
 		if (db_num_rows($result) == 1) {
 			$owner_uid = db_fetch_result($result, 0, "owner_uid");
-			return opml_export($link, $owner_uid, true, false);
+			return opml_export($link, "", $owner_uid, true, false);
 		} else {
 			print "<error>User not found</error>";
 		}