Use date instead of file mtime for updated date

lib/hexo/default_config.js

@@ -45,6 +45,8 @@ module.exports = {
   // Date / Time format
   date_format: 'YYYY-MM-DD',
   time_format: 'HH:mm:ss',
+  // Use post date for updated date instead of file modification date when front-matter provides no updated date
+  use_date_for_updated: false,
   // Pagination
   per_page: 10,
   pagination_dir: 'page',

lib/plugins/processor/asset.js

@@ -12,7 +12,7 @@ module.exports = ctx => {
     const { path } = file;
     const doc = Page.findOne({source: path});
     const { config } = ctx;
-    const { timezone } = config;
+    const { timezone, use_date_for_updated } = config;
 
     if (file.type === 'skip' && doc) {
       return;
@@ -48,6 +48,8 @@ module.exports = ctx => {
 
       if (data.updated) {
         if (timezone) data.updated = common.timezone(data.updated, timezone);
+      } else if (use_date_for_updated) {
+        data.updated = data.date;
       } else {
         data.updated = stats.mtime;
       }

lib/plugins/processor/post.js

@@ -26,7 +26,7 @@ module.exports = ctx => {
     const { path } = file.params;
     const doc = Post.findOne({source: file.path});
     const { config } = ctx;
-    const { timezone } = config;
+    const { timezone, use_date_for_updated } = config;
     let categories, tags;
 
     if (file.type === 'skip' && doc) {
@@ -84,6 +84,8 @@ module.exports = ctx => {
 
       if (data.updated) {
         if (timezone) data.updated = common.timezone(data.updated, timezone);
+      } else if (use_date_for_updated) {
+        data.updated = data.date;
       } else {
         data.updated = stats.mtime;
       }

test/scripts/processors/asset.js

@@ -280,6 +280,33 @@ describe('asset', () => {
     });
   });
 
+  it('page - use the date for updated if use_date_for_updated is set', () => {
+    const file = newFile({
+      path: 'hello.swig',
+      type: 'create',
+      renderable: true
+    });
+
+    hexo.config.use_date_for_updated = true;
+
+    return fs.writeFile(file.source, '').then(() => Promise.all([
+      fs.stat(file.source),
+      process(file)
+    ])).spread(stats => {
+      const page = Page.findOne({source: file.path});
+
+      page.date.toDate().should.eql(stats.ctime);
+      page.updated.toDate().should.eql(page.date.toDate());
+
+      return Promise.all([
+        page.remove(),
+        fs.unlink(file.source)
+      ]);
+    }).finally(() => {
+      hexo.config.use_date_for_updated = undefined;
+    });
+  });
+
   it('page - permalink', () => {
     const body = [
       'title: "Hello world"',
@@ -449,7 +476,7 @@ describe('asset', () => {
       const page = Page.findOne({source: file.path});
 
       page.date.toDate().should.eql(stats.ctime);
-      page.updated.toDate().should.eql(stats.mtime);
+      page.updated.toDate().should.eql(page.date.toDate());
 
       return Promise.all([
         page.remove(),

test/scripts/processors/post.js

@@ -537,6 +537,37 @@ describe('post', () => {
     }).finally(() => fs.unlink(file.source));
   });
 
+  it('post - use date when no updated and use_date_for_updated', () => {
+    const body = [
+      'title: "Hello world"',
+      '---'
+    ].join('\n');
+
+    const file = newFile({
+      path: 'foo.html',
+      published: true,
+      type: 'create',
+      renderable: true
+    });
+
+    hexo.config.use_date_for_updated = true;
+
+    return fs.writeFile(file.source, body).then(() => Promise.all([
+      file.stat(),
+      process(file)
+    ])).spread(stats => {
+      const post = Post.findOne({source: file.path});
+
+      post.date.toDate().setMilliseconds(0).should.eql(stats.birthtime.setMilliseconds(0));
+      post.updated.toDate().setMilliseconds(0).should.eql(stats.birthtime.setMilliseconds(0));
+
+      return post.remove();
+    }).finally(() => {
+      hexo.config.use_date_for_updated = undefined;
+      fs.unlink(file.source);
+    });
+  });
+
   it('post - photo is an alias for photos', () => {
     const body = [
       'title: "Hello world"',