How to get lastUpdated date of page?

Bug Report

I am trying to display the lastupdate time on each page. However, the lastupdated time o all pages is the same, even though I just updated one of them.

Steps to reproduce

I am using this to get the time:

...
hook.beforeEach(function(html) {
  return addLastUpdatedPlaceholder(html);
});

hook.afterEach(function(html, next) {
  const plugins = [insertLastUpdated];
  const finalHtml = plugins.reduce((accHtml, plugin) => plugin(accHtml), html);
  next(finalHtml);
});
...

function addLastUpdatedPlaceholder(html) {
    var footer = [
        '\n<footer class="last-updated">',
        `<small>__lastupdated__</small>`,
        '</footer>'
    ].join('');
    return html + footer;
}

function insertLastUpdated(html) {
    return html.replace(/__lastupdated__/, `Page last updated: ${window.$docsify.lastUpdated}`);
}

What is current behaviour

Displaying same time on all pages.

What is the expected behaviour

Display time of when page was last updated.

Other relevant information

• [ x] Bug does still occur when all/other plugins are disabled?

• Your OS: OSX

• Node.js version: 10.15.3

• npm/yarn version: 6.4.1

• Browser version: Chrome 83

• Docsify version: 4.4.0

• Docsify plugins: Custom

Please create a reproducible sandbox

Mention the docsify version in which this bug was not present (if any)

[sy-records]

you can use {docsify-updated}

for example :

window.$docsify = {
  plugins: [
    function(hook, vm) {
      hook.beforeEach(function(html) {
        return (
          html +
          '\n----\n' +
          'Last modified {docsify-updated} ' 
        );
      });
    }
  ]
};

However, if you deploy using a github page, you usually get the same time.

[joetidee]

I think this did it:

...
hook.beforeEach(function(html) {
          return addLastUpdatedPlaceholder(html, '{docsify-updated}');
      });
...
function addLastUpdatedPlaceholder(html, lastUpdated) {
    var footer = [
        '\n<footer class="last-updated">',
        `<small>Page last updated: ${lastUpdated}</small>`,
        '</footer>'
    ].join('');
    return html + footer;
}

As per, https://github.com/docsifyjs/docsify/blob/314e2d9d39a024270403a42eb19bd98e6cce8d17/docs/write-a-plugin.md