98 lines
3.3 KiB
C#
98 lines
3.3 KiB
C#
using HellionChat.Themes.Builtin;
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namespace HellionChat.Themes;
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public sealed class ThemeRegistry
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{
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public const string DefaultSlug = HellionArctic.Slug;
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private readonly Dictionary<string, Theme> _builtIns;
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private readonly Dictionary<string, (Theme Theme, DateTime Stamp)> _customCache = new(StringComparer.OrdinalIgnoreCase);
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private readonly string? _customThemesDir;
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private Theme _active;
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public ThemeRegistry(string? customThemesDir = null)
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{
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_builtIns = new Dictionary<string, Theme>(StringComparer.OrdinalIgnoreCase)
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{
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{ HellionArctic.Slug, HellionArctic.Build() },
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{ Chat2Classic.Slug, Chat2Classic.Build() },
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{ EventHorizon.Slug, EventHorizon.Build() },
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{ MoonlitBloom.Slug, MoonlitBloom.Build() },
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{ NightBlue.Slug, NightBlue.Build() },
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{ MintGrove.Slug, MintGrove.Build() },
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};
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_active = _builtIns[DefaultSlug];
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_customThemesDir = customThemesDir;
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}
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public Theme Active => _active;
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public Theme Get(string slug)
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{
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if (_builtIns.TryGetValue(slug, out var b)) return b;
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var custom = LoadCustomBySlug(slug);
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if (custom != null) return custom;
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return _builtIns[DefaultSlug];
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}
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public IEnumerable<Theme> AllBuiltIns() => _builtIns.Values;
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public IEnumerable<Theme> AllCustom() => RefreshCustomCache();
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public void Switch(string slug) => _active = Get(slug);
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// Custom-Themes werden lazy aus dem Verzeichnis geladen, Cache mit
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// LastWriteTime-Token. Eine geänderte JSON wird beim nächsten Lookup
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// neu eingelesen.
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private Theme? LoadCustomBySlug(string slug)
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{
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if (_customThemesDir is null) return null;
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if (!Directory.Exists(_customThemesDir)) return null;
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foreach (var theme in RefreshCustomCache())
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if (string.Equals(theme.Slug, slug, StringComparison.OrdinalIgnoreCase))
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return theme;
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return null;
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}
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private IEnumerable<Theme> RefreshCustomCache()
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{
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if (_customThemesDir is null || !Directory.Exists(_customThemesDir))
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yield break;
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var seenSlugs = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
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foreach (var path in Directory.EnumerateFiles(_customThemesDir, "*.json"))
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{
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Theme? theme = null;
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var stamp = File.GetLastWriteTimeUtc(path);
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var key = path;
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if (_customCache.TryGetValue(key, out var cached) && cached.Stamp == stamp)
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{
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theme = cached.Theme;
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}
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else
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{
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try
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{
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theme = ThemeJsonLoader.LoadFromFile(path);
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_customCache[key] = (theme, stamp);
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}
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catch (Exception ex)
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{
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// Logging passiert in Plugin.cs durch den Aufrufer; hier still
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// ignorieren, damit ein einzelnes kaputtes JSON nicht alle
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// Custom-Themes blockt.
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_ = ex;
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continue;
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}
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}
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if (theme is not null && seenSlugs.Add(theme.Slug))
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yield return theme;
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}
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}
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}
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