✨ Add startLine, endLine Support for codeimporter

[jason810496]

Feat: Adding startLine, endLine support for codeimporter shortcodes

• I'm writing a blog that needs to import code from GitHub, but only a specific range of code.
  • The current codeimporter shortcodes don't provide this feature.
• If startLine and endLine are not provided, the whole code will be imported .
• Updated the docs and provided examples as well (have run npm run example, works nicely).

Working example on my blog:

{{< codeimporter url="https://raw.githubusercontent.com/redis/redis/811c5d7aeb0b76494d78efe61e418f574c310ec0/src/rdb.c" type="c" startLine="3907" endLine="3942">}}

Big thanks for sharing this theme 💯
I'm enjoying the i18n support and wonderful UX. I will promote it to my friends 🙌

[jason810496]

Thanks for the reminder! @mnjm
I have fixed the URL encoding issue mentioned.