How to add meta tag to mdBook?

Question

I'd like to add Twitter Card via meta tag to mdBook.

How can I add meta tags (example below) to mdBook?

<meta name="twitter:card" content="summary"></meta>

Current workaround is to execute sed command after mdbook build.

Answer 1

You can use the theme feature of mdBook.

1. Create a random mdBook with --theme option.

   $ mdbook init --theme abc
   

2. Confirm theme/ directory is created.

   $ ls
   
   book  book.toml  src  theme
   

3. Copy theme/ directory to your mdBook directory.

4. Edit theme/index.hbs.

5. Execute mdbook build as usual.