Sublime Text command to debug blank/wrong file icons

DebugFileIcon.py

# Given a file extension, displays information about the assigned file icon
#
# Usage:
#
# 1) Open a window in Sublime Text
# 2) View -> Show Console
# 3) Type in the following (with your extension instead of "h"):
#    window.run_command("debug_file_icon, { "extension": "h" })
#

from __future__ import annotations

import sublime
import sublime_plugin
import plistlib


def get_icon_for_syntax(syntax: sublime.Syntax) -> str:
    window = sublime.active_window()

    tmp_view = window.new_file(flags=sublime.NewFileFlags.TRANSIENT)

    tmp_view.set_scratch(True)
    tmp_view.assign_syntax(syntax)
    icon = tmp_view.meta_info("icon", 0)
    tmp_view.close()
    
    return icon


class DebugFileIcon(sublime_plugin.WindowCommand):
    def run(self, extension: str):
        syntax = sublime.find_syntax_for_file(f"foo.{extension}")
        used_icon = get_icon_for_syntax(syntax)
        scope = syntax.scope

        print("")
        print(f"File extension '{extension}' resolved to scope '{scope}'")
        print(f"Scope '{scope}' resolved to icon name '{used_icon}'")
        print()
        
        print("Scanning .tmPreferences files for icon settings...")
        print()

        matches = [ ]
        
        for tm_preference in sublime.find_resources("*.tmPreferences"):
            contents = sublime.load_binary_resource(tm_preference)
            plist = plistlib.loads(contents)
            if settings := plist.get("settings"):
                icon = settings.get("icon")
                selector = plist.get("scope")
                
                if icon and selector and icon == used_icon:
                    score = sublime.score_selector(syntax.scope, selector)
                
                    if score > 0:
                        matches.append( ( tm_preference, score, selector, icon ) )
        
        for match in matches:
            print(f"    File: '{match[0]}'")
            print(f"   Score: '{match[1]}'")
            print(f"Selector: '{match[2]}'")
            print(f"    Icon: '{match[3]}'")
            print()