Support absolute path for extra theme

[melck]

I have tried this option "markdown.marp.themes" and like it is described, it only work with relative css file in workspace or url.

I want to have a external folder with multiple themes. Do you think u could support absolute path for that ?

[yhatt]

Our resolution rule is following as same as VS Code's markdown.styles rule. Unfortunately we have not thought absolute path support for markdown.marp.themes because there is potential security risk by a malicious workspace.

Refer to microsoft/vscode#45260 (comment).

[melck]

Thanks for information 😢. I understand why, but it's not really simple for external theme with image, etc.

[yhatt]

Sometimes we have to take an inconvenience for users safe. 😗

You can take some workarounds:

• Use symbolic link to global theme CSS folder (Can't custum markdown style microsoft/vscode#45260 (comment))
• Specify URL to served CSS in localhost through external tool (e.g. http://localhost:3000/your-theme.css)
• Use Marp CLI (Perhaps some convertions requires insecure --allow-local-files flag)