Support dprint-ignore for a region

[jakebailey]

I have a piece of code that is formatted to look like a table: https://github.com/microsoft/TypeScript/blob/7910c509c4545517489d6264571bb6c05248fb4a/src/testRunner/unittests/tsserver/projectReferences.ts#L1573

I can // dprint-ignore the entire function (the describe), but that disables formatting for code I do want formatted. Or, I can wrap the code in a block like:

// dprint-ignore
{
    // Some comemnt
    baselineDisableReferencedProjectLoad(...)
    baselineDisableReferencedProjectLoad(...)
    baselineDisableReferencedProjectLoad(...)
}

But, it would be nice to instead do something like eslint where I can have:

/* dprint-ignore-start */
// my special code
/* dprint-ignore-end */

I'm not sure how possible that is; it seems like the existing ignore feature puts comments on nodes for a reason, probably because the info is stored in the AST rather than using locations?

Prettier sort of has this for regions: https://prettier.io/docs/en/ignore.html#range-ignore (But, does the same as dprint in that its other ignore comment is AST based)

[dsherret]

dprint-plugin-markdown also has this for regions. It wouldn't be too difficult to add this. Essentially, detect one of these comments, then increment a count in the context, then format all nodes as ignore until a dprint-ignore-end comment is found.

[jakebailey]

I realized that I sent this to the TS plugin repo unintentionally, but I'm assuming this would be something that would need to be implemented in each plugin separately.

[dsherret]

This is the right place to ask this. It needs to be done per plugin. The CLI to plugin interface is really simple and is essentially just "here's a file path and here's some text, please format it"

[jakebailey]

Makes sense!