API
Harmony Scoreboard has an easy-to-use API for registering placeholders and changing the player's scoreboard.

If you want to register placeholders when your plugin loads, make sure to have Harmony Scoreboard as a dependency.

depend: [HarmonyScoreboard]

Registering Placeholders
Every placeholder needs to be of type HarmonyPlaceholder. Here is an example of a placeholder that replaces %health% with the player's health.

Then we need to register the placeholder. That can be easily done with

HarmonyBoardAPI.registerPlaceholder(new HealthPlaceholder());

All HarmonyBoardAPI functions are static, there is no need to create an instance.

In order to remove the placeholder, you can either remove it based on its instance or on its name.

Setting Scoreboards
You can set a player's scoreboard with the setScoreboard function. It takes as parameters the player and the name of the scoreboard you want to set. It bypasses and permission / world check.

HarmonyBoardException is thrown if the player is null or if the name of the scoreboard is invalid.