A TerraPatcher plugin for tweaking item stats.

ItemConf.cs

using System;
using System.Collections.Generic;
using PluginLoader;
using Terraria;

/// Updated July 24, 2015
/// Updates: https://gist.github.com/YellowAfterlife/1edaa4060191823ee366
namespace YellowAfterlifePlugins {
	/// Item modification rules are defined as following:
	///  [item3507]
	///  name=Copper Sword Plus
	///  damage=20
	/// A list of possible fields can be seen below.
	/// "string" is text
	/// "float" is any number
	///	"int" is "rounded" number (1,2,3,...)
	///	"bool" is toggle ("true"/"false")
	public class ItemConfRule {
		public string name;
		//
		/// aka "auto-swing" for weapons
		public bool? autoReuse;
		public int? damage;
		public float? knockback;
		public int? crit;
		public int? defense;
		/// item "use time"/cooldown, in frames
		public int? useTime;
		/// secondary use time (used by weapons with two attacks)
		public int? useTime2;
		//
		public int? holdStyle;
		public int? useStyle;
		//
		public int? maxStack;
		/// size (1.0 is normal)
		public float? scale;
		public string toolTip;
		public string toolTip2;
		public ItemConfRule() { }
	}
	public class ItemConf : IPluginItemSetDefaults {
		Dictionary<int, ItemConfRule> rules;
		const string confPath = "plugins/ItemConf.ini";
		const int confSize = 255;
		private string loadString(string section, string field) {
			string s = IniAPI.ReadIni(section, field, "", confSize, confPath);
			return s != "" ? s : null;
		}
		private int? loadInt(string section, string field) {
			string s = IniAPI.ReadIni(section, field, "", confSize, confPath);
			if (s != "") {
				return int.Parse(s);
			} else return null;
		}
		private float? loadFloat(string section, string field) {
			string s = IniAPI.ReadIni(section, field, "", confSize, confPath);
			if (s != "") {
				return float.Parse(s);
			} else return null;
		}
		private bool? loadBool(string section, string field) {
			string s = IniAPI.ReadIni(section, field, "", confSize, confPath);
			if (s != "") {
				s = s.ToLower();
				return (s == "1" || s == "true" || s == "yes");
			} else return null;
		}
		public ItemConf() {
			rules = new Dictionary<int, ItemConfRule>();
			IniAPI.ReadIni("header", "hint",
				"Add rules below; See ItemConf.cs for instructions.",
				255, confPath, true);
			foreach (string section in IniAPI.GetIniSections(confPath)) {
				if (section.ToLower().StartsWith("item")) {
					int id = int.Parse(section.Substring(4));
					ItemConfRule r = new ItemConfRule();
					//
					r.name = loadString(section, "name");
					r.autoReuse = loadBool(section, "autoReuse");
					r.damage = loadInt(section, "damage");
					r.knockback = loadFloat(section, "knockback");
					r.crit = loadInt(section, "crit");
					r.defense = loadInt(section, "defense");
					r.useTime = loadInt(section, "useTime");
					r.useTime2 = loadInt(section, "useTime2");
					//
					r.holdStyle = loadInt(section, "holdStyle");
					r.useStyle = loadInt(section, "useStyle");
					//
					r.maxStack = loadInt(section, "maxStack");
					r.scale = loadFloat(section, "scale");
					r.toolTip = loadString(section, "toolTip");
					r.toolTip2 = loadString(section, "toolTip2");
					//
					rules[id] = r;
				}
			}
		}
		public void OnItemSetDefaults(Item item) {
			if (rules.ContainsKey(item.type)) {
				ItemConfRule r = rules[item.type];
				if (r.name != null) item.name = r.name;
				if (r.autoReuse != null) item.autoReuse = (bool)r.autoReuse;
				if (r.damage != null) item.damage = (int)r.damage;
				if (r.knockback != null) item.knockBack = (float)r.knockback;
				if (r.crit != null) item.crit = (int)r.crit - 4;
				if (r.defense != null) item.defense = (int)r.defense;
				if (r.useTime != null) item.useAnimation = (int)r.useTime;
				if (r.useTime2 != null) item.useTime = (int)r.useTime2;
				//
				if (r.holdStyle != null) item.holdStyle = (int)r.holdStyle;
				if (r.useStyle != null) item.useStyle = (int)r.useStyle;
				//
				if (r.maxStack != null) item.maxStack = (int)r.maxStack;
				if (r.scale != null) item.scale = (float)r.scale;
				if (r.toolTip != null) item.toolTip = r.toolTip;
				if (r.toolTip2 != null) item.toolTip2 = r.toolTip2;
			}
		}
	}
}

How to use?