Some handy editor scripting for working with UI text and buttons in VRChat Udon development

ButtonEditorEnhancer.cs

using System.Linq;
using TMPro;
using TMPro.EditorUtilities;
using UnityEditor;
using UnityEditor.Events;
using UnityEditor.SceneManagement;
using UnityEngine;
using UnityEngine.UI;
using VRC.Udon;

// Adds automation so the text on the button matches the button's name.
[CustomEditor(typeof(Button))]
public class ButtonEditorEnhancer : UnityEditor.UI.ButtonEditor
{
    [SerializeField] private UdonBehaviour buttonOnClickUdonTarget;
    private int selectedEvent;
    
    public override void OnInspectorGUI()
    {
        base.OnInspectorGUI();
        
        // Get the selected object. Update its text so it matches the name of the object.
        // This is a grotty script.

        var obj = Selection.activeGameObject;
        if (!obj)
        {
            return;
        }
        
        var text = Selection.activeGameObject.GetComponentInChildren<TMP_Text>();
        if (text)
        {
            text.text = obj.name;
        }
        
        buttonOnClickUdonTarget = (UdonBehaviour)EditorGUILayout.ObjectField("Target Udon Behaviour:", buttonOnClickUdonTarget, typeof(UdonBehaviour), true);
        if (!buttonOnClickUdonTarget)
        {
            return;
        }
        
        // If we've provided an UdonTarget, set the button via some fun tricks, so we don't have to manually look up the name of the string corresponding to the exported Custom Event.
        
        // Get the event names via an utter nonsense lookup.
        var program = buttonOnClickUdonTarget.programSource.SerializedProgramAsset.RetrieveProgram();
        if (program == null)
        {
            return;
        }
        
        var events = program.EntryPoints.GetExportedSymbols();
        
        // Get the user to pick an event via a dropdown menu. This is an int; stash it.
        selectedEvent = EditorGUILayout.Popup("Selected Event", selectedEvent, events.ToArray());

        var buttonTarget = (Button) target;

        // Clear all instances of the UdonBehaviour from the OnClick listener list.
        // This means if you're using this automation you can't use the same UdonBehaviour twice in the same OnClick.
        // Frankly, if you, are, skill issue. 🎃. Just write a single function that calls both internally. If you're
        // doing something exceptionally cursed, just manually input the events!
        for (var i = 0; i < buttonTarget.onClick.GetPersistentEventCount(); i++)
        {
            if (buttonTarget.onClick.GetPersistentTarget(i) != buttonOnClickUdonTarget)
            {
                continue;
            }
                
            UnityEventTools.RemovePersistentListener(buttonTarget.onClick, i);
        }
        
        // Stick a string persistent listener that directs to trigger SCE on the UB using the event the user picked.
        UnityEventTools.AddStringPersistentListener(buttonTarget.onClick, buttonOnClickUdonTarget.SendCustomEvent, events[selectedEvent]);
        
        // Write to the object. Note that once we close this inspector window, the behaviour we used for this automation
        // will be cleared if we re-open the window. Which is totally a feature and not a limitation.
        
        // Leaving this here in case we mess with the serialized object in an update to this script.
        // serializedObject.ApplyModifiedProperties();
        
        Undo.RecordObject(buttonTarget, "modified on-click events");
        PrefabUtility.RecordPrefabInstancePropertyModifications(buttonTarget);
    }
}

// Adds automation so the name of the text object matches the text of the object.
[CustomEditor(typeof(TextMeshProUGUI))]
public class TMProTextEnhancer : TMP_EditorPanelUI
{
    public override void OnInspectorGUI()
    {
        base.OnInspectorGUI();
        
        // Get the selected object. Update its name so it matches the text of the object.
        // This is a grotty script.

        var obj = Selection.activeGameObject;
        if (!obj)
        {
            return;
        }
        
        var text = Selection.activeGameObject.GetComponent<TMP_Text>();
        if (text)
        {
            obj.name = text.text;
        }
    }
}

The above code is hereby declared as part of the public domain; the original author declares no ownership over it. No relationship is assumed between original author and user.