修复参加比赛的错误

hydro/lib/misc.js

@@ -11,6 +11,9 @@ exports.datetime_span = function (dt, relative = true, format = '%Y-%m-%d %H:%M:
         dt.format(format)
     );
 };
+exports.nl2br = function (self) {
+    return self.replace(/\n/gm, '<br>');
+};
 exports.paginate = function* (page, num_pages) {
     let radius = 2, first, last;
     if (page > 1) {

hydro/lib/rank.js

@@ -0,0 +1,11 @@
+module.exports = function* ranked(diter, equ = (a, b) => a == b) {
+    let last_doc = null;
+    let r = 0, count = 0;
+    for (let doc of diter) {
+        count++;
+        if (count == 1 || !equ(last_doc, doc))
+            r = count;
+        last_doc = doc;
+        yield [r, doc];
+    }
+};