Unity3D Editor Tool to convert Unity GUI Text objects to Text Mesh Pro Text Objects

UGuiTextToTextMeshPro.cs

using TMPro;
using TMPro.EditorUtilities;
using UnityEditor;
using UnityEngine;
using UnityEngine.UI;

public class UGuiTextToTextMeshPro : Editor
{
    [MenuItem("GameObject/UI/Convert To Text Mesh Pro", false, 4000)]
    private static void DoIt()
    {
        foreach (var obj in Selection.gameObjects)
        {
            var uiText = obj.GetComponent<Text>();
            if (uiText == null)
                continue;

            var command = new MenuCommand(uiText);

            var method = typeof(TMPro_CreateObjectMenu).GetMethod("CreateTextMeshProGuiObjectPerform",
                System.Reflection.BindingFlags.Static | System.Reflection.BindingFlags.NonPublic);
            if (method != null) method.Invoke(null, new object[] { command });

            var tmp = Selection.activeGameObject.GetComponent<TextMeshProUGUI>();

            if (tmp == null)
            {
                EditorUtility.DisplayDialog(
                    "ERROR!",
                    "Something went wrong! Text Mesh Pro did not select the newly created object.",
                    "OK",
                    "");
                return;
            }

            tmp.fontStyle = GetTmpFontStyle(uiText.fontStyle);

            tmp.fontSize = uiText.fontSize;
            tmp.fontSizeMin = uiText.resizeTextMinSize;
            tmp.fontSizeMax = uiText.resizeTextMaxSize;
            tmp.enableAutoSizing = uiText.resizeTextForBestFit;
            tmp.alignment = GetTmpAlignment(uiText.alignment);
            tmp.text = uiText.text;
            tmp.color = uiText.color;

            tmp.transform.SetParent(uiText.transform.parent);
            tmp.name = uiText.name;

            tmp.rectTransform.anchoredPosition3D = uiText.rectTransform.anchoredPosition3D;
            tmp.rectTransform.anchorMax = uiText.rectTransform.anchorMax;
            tmp.rectTransform.anchorMin = uiText.rectTransform.anchorMin;
            tmp.rectTransform.localPosition = uiText.rectTransform.localPosition;
            tmp.rectTransform.localRotation = uiText.rectTransform.localRotation;
            tmp.rectTransform.localScale = uiText.rectTransform.localScale;
            tmp.rectTransform.pivot = uiText.rectTransform.pivot;
            tmp.rectTransform.sizeDelta = uiText.rectTransform.sizeDelta;

            tmp.transform.SetSiblingIndex(uiText.transform.GetSiblingIndex());

            // Copy all other components
            var components = uiText.GetComponents<Component>();
            var componentsCopied = 0;
            foreach (var t in components)
            {
                var thisType = t.GetType();
                if (thisType == typeof(Text) ||
                    thisType == typeof(RectTransform) ||
                    thisType == typeof(Transform) ||
                    thisType == typeof(CanvasRenderer))
                    continue;

                UnityEditorInternal.ComponentUtility.CopyComponent(t);
                UnityEditorInternal.ComponentUtility.PasteComponentAsNew(tmp.gameObject);

                componentsCopied++;
            }

            if (componentsCopied == 0)
                Undo.DestroyObjectImmediate(uiText.gameObject);
            else
            {
                EditorUtility.DisplayDialog(
                    "uGUI to TextMesh Pro",
                    $"{componentsCopied} components copied. Please check for accuracy as some references may not transfer properly.",
                    "OK",
                    "");
                uiText.name += " OLD";
                uiText.gameObject.SetActive(false);
            }
        }
    }


    private static FontStyles GetTmpFontStyle(FontStyle uGuiFontStyle)
    {
        FontStyles tmp;
        switch (uGuiFontStyle)
        {
            case FontStyle.Normal:
            default:
                tmp = FontStyles.Normal;
                break;
            case FontStyle.Bold:
                tmp = FontStyles.Bold;
                break;
            case FontStyle.Italic:
                tmp = FontStyles.Italic;
                break;
            case FontStyle.BoldAndItalic:
                tmp = FontStyles.Bold | FontStyles.Italic;
                break;
        }

        return tmp;
    }


    private static TextAlignmentOptions GetTmpAlignment(TextAnchor uGuiAlignment)
    {
        TextAlignmentOptions alignment;

        switch (uGuiAlignment)
        {
            default:
            case TextAnchor.UpperLeft:
                alignment = TextAlignmentOptions.TopLeft;
                break;
            case TextAnchor.UpperCenter:
                alignment = TextAlignmentOptions.Top;
                break;
            case TextAnchor.UpperRight:
                alignment = TextAlignmentOptions.TopRight;
                break;
            case TextAnchor.MiddleLeft:
                alignment = TextAlignmentOptions.MidlineLeft;
                break;
            case TextAnchor.MiddleCenter:
                alignment = TextAlignmentOptions.Midline;
                break;
            case TextAnchor.MiddleRight:
                alignment = TextAlignmentOptions.MidlineRight;
                break;
            case TextAnchor.LowerLeft:
                alignment = TextAlignmentOptions.BottomLeft;
                break;
            case TextAnchor.LowerCenter:
                alignment = TextAlignmentOptions.Bottom;
                break;
            case TextAnchor.LowerRight:
                alignment = TextAlignmentOptions.BottomRight;
                break;
        }

        return alignment;
    }
}