StateUnsealsSkillType.js

/*:
 * @plugindesc Provides a tag that allows you to unseal particular skill types with a state
 * Also grays out the skill type in the command window when the skill type is unavailable
 *
 * @help
 * Use the tag <unsealskilltype:3> for example, to unseal skilltype #3
 *
 * No warranty, express or implied. I can't guarantee that it will
 * work at all. If it's useful to you, credit is appreciated.
 * You may redistribute, but do not remove any of the above.
 */

(function(){

Game_BattlerBase.prototype.isSkillTypeSealed = function(stypeId) {
    var unseals = [];
    this._states.forEach(function(state) {
        meta = $dataStates[state].meta.unsealskilltype;
        if (meta){
            unseals.push(Number(meta));
        }
    });

    if (unseals.contains(stypeId)){
        return false;
    }
    return this.traitsSet(Game_BattlerBase.TRAIT_STYPE_SEAL).contains(stypeId);
};

Window_ActorCommand.prototype.addSkillCommands = function() {
    var skillTypes = this._actor.addedSkillTypes();
    skillTypes.sort(function(a, b) {
        return a - b;
    });
    skillTypes.forEach(function(stypeId) {
        var name = $dataSystem.skillTypes[stypeId];
        this.addCommand(name, 'skill', !this._actor.isSkillTypeSealed(stypeId), stypeId);
    }, this);
};

})();