添加站内消息，修复讨论节点丢失的问题

hydro/lib/template.js

@@ -1,35 +1,49 @@
-const path = require('path');
 const nunjucks = require('nunjucks');
 const markdown = require('./markdown');
-const options = require('../options');
 const perm = require('../permission');
 const builtin = require('../model/builtin');
 const model = require('../model');
 const misc = require('./misc');
 
+function Loader() { }
+Loader.prototype.getSource = function getSource(name) {
+    if (!global.Hydro.template[name]) throw new Error();
+    return {
+        src: global.Hydro.template[name],
+        path: name,
+    };
+};
+
 class Nunjucks extends nunjucks.Environment {
     constructor() {
-        super(
-            new nunjucks.FileSystemLoader(path.resolve(options.template.path)),
-            { autoescape: true, trimBlocks: true },
-        );
+        super(new Loader(), { autoescape: true, trimBlocks: true });
         this.addFilter('json', (self) => JSON.stringify(self), false);
         this.addFilter('assign', (self, data) => Object.assign(self, data));
         this.addFilter('markdown', (self) => markdown.render(self));
         this.addFilter('base64_encode', (s) => Buffer.from(s).toString('base64'));
-        this.addFilter('gravatar_url', misc.gravatar_url);
-        this.addFilter('format_size', misc.format_size);
-        this.addGlobal('typeof', (o) => typeof o);
-        this.addGlobal('console', console);
-        this.addGlobal('static_url', (str) => `/${str}`);
-        this.addGlobal('reverse_url', (str) => str);
-        this.addGlobal('datetime_span', misc.datetime_span);
-        this.addGlobal('paginate', misc.paginate);
-        this.addGlobal('perm', perm);
-        this.addGlobal('status', builtin.STATUS);
-        this.addGlobal('model', model);
     }
 }
 const env = new Nunjucks();
 
-module.exports = env;
+module.exports = {
+    render(name, state) {
+        Object.assign(state, {
+            typeof: (o) => typeof o,
+            static_url: (str) => `/${str}`,
+            datetime_span: misc.datetime_span,
+            paginate: misc.paginate,
+            perm,
+            status: builtin.status,
+            size: misc.size,
+            gravatar: misc.gravatar,
+            model,
+            Context: global.Hydro.ui,
+        });
+        return new Promise((resolve, reject) => {
+            env.render(name, state, (err, res) => {
+                if (err) reject(err);
+                else resolve(res);
+            });
+        });
+    },
+};