Addon to a Yanfly RMMV plugin. Shows mastery status instead of class level in actor's class list.

YEP_SkillLearnSystem_MasteryCheck.js

// YEP_SkillLearnSystem_MasteryCheck.js
/*:
@plugindesc v0.3 Shows mastery status instead of class level in actor's class list.
@author Decanter

@help
Shows count of skills obtained vs skills obtainable on class change list.
Colors count for non-mastered classes differently.

Place in plugin list directly after YEP_SkillLearnSystem.

Overrides one function in YEP_ClassChangeCore.

@param mastered text
@desc Text to show instead of skill count when mastered. Leave blank to still show skill count.
@default 

@param mastered color
@desc Color for mastered classes. Hex code formatted #ffffff
@default #84aaff

@param unmastered color
@desc Color for unmastered classes. Hex code formatted #ffffff
@default #66cc40

@param stalled color
@desc Color for classes that can't be mastered yet. Hex code formatted #ffffff
@default #ffffff
*/

(function() {
  var params = PluginManager.parameters("YEP_SkillLearnSystem_MasteryCheck");
  var masteredText = String(params["mastered text"]);
  var masteredColor = String(params["mastered color"]);
  var unmasteredColor = String(params["unmastered color"]);
  var stalledColor = String(params["stalled color"]);
  
  // override
  Window_ClassList.prototype.drawClassLevel = function(item, x, y, width) {
    var aryActorSkills = this._actor._skills;
    var aryClassSkills = item.learnSkills;
    var numClassSkills = aryClassSkills.length;
    var arySkillsUnlearned = aryClassSkills.filter(function(el){ return (aryActorSkills.indexOf(el) == -1) }, this);
    var numSkillsUnlearned = arySkillsUnlearned.length;
    var arySkillsStalled = arySkillsUnlearned.filter(function(el){ return !this.meetsRequirements($dataSkills[el]) }, this);
    var numSkillsStalled = arySkillsStalled.length;
    var numClassSkillsLearned = numClassSkills - numSkillsUnlearned;
    var skillCountText;
    if (numSkillsUnlearned == 0 && masteredText.length > 0) {
      skillCountText = masteredText;
    } else {
      skillCountText = numClassSkillsLearned + "/" + numClassSkills;
    }
    
    this.resetFontSettings();
    if (numSkillsUnlearned == 0) {
      this.changeTextColor(masteredColor);
    } else if (numSkillsUnlearned == numSkillsStalled) {
      this.changeTextColor(stalledColor);
    } else {
      this.changeTextColor(unmasteredColor);
    }
    this.contents.fontSize = Yanfly.Param.CCCLvFontSize;
    this.drawText(skillCountText, x, y, width, 'right');
  };
  
  // copying guts of Window_SkillLearn.meetsRequirements 
  // because Yanfly apparently didn't anticipate anyone checking this outside that window
  Window_ClassList.prototype.meetsRequirements = function(skill) {
    var evalValue = this.getEvalLine(skill.learnShowEval);
    if (evalValue !== undefined) return evalValue;
    if (Imported.YEP_ClassChangeCore) {
      var classLevel = this._actor.classLevel(this._classId);
      if (skill.learnRequireLevel > classLevel) return false;
    } else {
      if (skill.learnRequireLevel > this._actor.level) return false;
    }
    for (var i = 0; i < skill.learnRequireSkill.length; ++i) {
      var skillId = skill.learnRequireSkill[i];
      if (!$dataSkills[skillId]) continue;
      if (!this._actor.isLearnedSkill(skillId)) return false;
    }
    for (var i = 0; i < skill.learnRequireSwitch.length; ++i) {
      var switchId = skill.learnRequireSwitch[i];
      if (!$gameSwitches.value(switchId)) return false;
    }
    return true;
  };
  
  // copying guts of Window_SkillLearn.getEvalLine 
  // because Yanfly apparently didn't anticipate anyone checking this outside that window
  Window_ClassList.prototype.getEvalLine = function(evalLine) {
    if (evalLine.length <= 0) return undefined;
    var value = undefined;
    var a = this._actor;
    var user = this._actor;
    var subject = this._actor;
    var s = $gameSwitches._data;
    var v = $gameVariables._data;
    eval(evalLine);
    return value;
  };
  
})();