Allow opening documentation for the current editor or tool with F1

[elisee]

The documentation plugin provides a generic mechanism for plugins to register one or more Markdown documentation pages.

It would be nice to be able to call up the related documentation page for the current editor or tool by pressing F1 (or later, clicking some button).

• Expose a setupHelpCallback(callback: Function); method to SupClient that simply stores the callback for later use and should be called by each editor or tool on startup
• Bind the F1 in SupClient.setupHotkeys to check if a help callback was provided, and if so, call it
• Add a window.addEventListener("message", ...); handler to the documentation editor, similar to

  superpowers-game/plugins/default/typescript/editors/search/ui.ts

  Line 27 in 2f0a995

  window.addEventListener("message", (event: any) => {

• Go over the editors that already have some documentation pages and use SupClient.setupHelpCallback to open the documentation tool at the correct page using window.parent.postMessage similar to https://github.com/superpowers/superpowers-game/blob/master/plugins/default/typescript/editors/script/ui.ts#L505

[abclive]

I'll give it a try tomorrow :)

[bilou84]

This is done :) See
d4150de
and
superpowers/superpowers-core@b4273e2