Frontmatter Variable Substitution doesn't work in V2 Preview/Publishing

[aleksey-rowan]

Please select the area your Bug applys to. (Multiple selections are Possible)

• Onboard. Initial vault setup and import/export pods
• Create. Note creation, lookup, snippets and templates
• Retrieve. Backlinks, references, graph view
• Structure. Refactoring, multi-vault and schemas
• Publish. Sharing your repo with the world
• Misc (Choose this if your not sure)

Describe the bug

Frontmatter variable substitution doesn't work in V2 preview; it seems it hasn't been carried over from V1.

To Reproduce

Steps to reproduce the behavior:

1. Add a new variable to the frontmatter (mood: ambivalent)
2. Use the variable in the note ({{fm.mood}})
3. Open V2 preview
4. Observe that the variable value is not interpolated into the text and the note simply shows {{fm.mood}}

Expected behavior

Frontmatter variable substitution should work in V2 the same it does in V1.

Screenshots

Desktop (please complete the following information)

• Version 0.58.1

[aleksey-rowan]

After the fix, it seems that useNunjucks: true is required for variable substitution to function. Otherwise, everything seems to work as expected.

[hikchoi]

Thanks for the feedback on the fix @aleksey-rowan

Note on Nunjucks:
Currently Nunjucks is only used for frontmatter variable substitution and the overhead is quite large. We are planning to change it so that enabling Nunjucks isn't required for variable substitution works in the following week.

Please do let us know if you have any other concerns with this issue. Otherwise, this issue will be automatically closed in 4 days.

[aleksey-rowan]

@hikchoi I tried some more and out of the standard frontmatter values, only {{ fm.title }} works; others (created, updated, desc, and id) are not rendered.

Custom frontmatter values do get rendered and that's why I didn't catch the above right away.

[hikchoi]

@aleksey-rowan

others (created, updated, desc, and id) are not rendered.

This is expected behavior.
The currently exposed variables are:

1. {{fname}} (exposed by nunjucks itself)
2. {{fm.title}}
3. any custom frontmatter

It was implemented this way since it was first introduced, but I am blanking on the rationale behind it.
@kevinslin Could you give us some insight on why the other frontmatter variables aren't exposed?

[hikchoi]

As of v68 we have removed the Nunjucks dependency and frontmatter variable substitution will work out of the box.

We've also added created, updated, and id to the exposed frontmatter object.