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annotate src/sys/glib/dark_theme.cc @ 379:5eaafed6c10b

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*: clang-format
author Paper <paper@tflc.us>
date Wed, 05 Nov 2025 12:59:46 -0500
parents 99c961c91809
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #include "sys/glib/dark_theme.h"
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2
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3 #include <array>
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4 #include <cstring>
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5 #include <gio/gio.h>
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6 #include <memory>
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7 #include <string_view>
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8
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9 namespace glib {
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10
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11 /* deleters */
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12 template<typename T>
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13 struct g_object_del {
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14 void operator()(T *p) const { ::g_object_unref(p); };
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15 };
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16
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17 template<typename T>
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18 struct g_variant_del {
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19 void operator()(T *p) const { ::g_variant_unref(p); };
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20 };
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22 template<typename T>
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23 struct g_malloc_del {
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24 void operator()(T *p) const { ::g_free(p); };
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25 };
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27 template<typename T>
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28 using GObjectPtr = std::unique_ptr<T, g_object_del<T>>;
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30 template<typename T>
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31 using GVariantPtr = std::unique_ptr<T, g_variant_del<T>>;
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33 template<typename T>
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34 using GMallocPtr = std::unique_ptr<T, g_malloc_del<T>>;
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35
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36 /* not really "glib" but GNOME-related enough */
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37 bool IsGTKThemeDark(const std::string_view str)
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38 {
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39 /* if that doesn't exist, use the GTK theme and check for some known
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40 * suffixes. if one is found, return
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41 *
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42 * XXX probably better to use case folding here */
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43 static constexpr std::array<std::string_view, 3> suffixes = {
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44 "-dark", /* Adwaita-dark */
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45 "-Dark", /* Arc-Dark */
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46 "-Darker", /* Arc-Darker */
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47 };
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48
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49 for (const auto &suffix : suffixes) {
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50 if (str.size() < suffix.size())
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51 continue;
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52
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53 if (std::equal(str.data() + str.size() - suffix.length(), str.data() + str.size(), suffix.begin(),
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54 suffix.end()))
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55 return true;
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56 }
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57
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58 return false;
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59 }
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60
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61 bool IsInDarkTheme()
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62 {
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63 GObjectPtr<GSettings> settings(::g_settings_new("org.gnome.desktop.interface"));
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64 if (!settings)
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65 return false;
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67 {
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68 /* first attempt to get the colorscheme */
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69 GVariantPtr<GVariant> val(::g_settings_get_value(settings.get(), "color-scheme"));
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70 if (!val)
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71 return false;
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73 /* this is free'd upon deconstruction of the GVariantPtr */
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74 gsize size;
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75 const gchar *str = ::g_variant_get_string(val.get(), &size);
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76 if (!str)
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77 return false;
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79 bool success = !std::strncmp(str, "prefer-dark", size);
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81 if (success)
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82 return true;
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83 }
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85 {
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87 GVariantPtr<GVariant> gtk_theme(::g_settings_get_value(settings.get(), "gtk-theme"));
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88 if (!gtk_theme)
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89 return false;
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91 gsize size;
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92 const gchar *str = ::g_variant_get_string(gtk_theme.get(), &size);
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93 if (!str)
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94 return false;
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95
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96 if (IsGTKThemeDark({str, size}))
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97 return true;
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98 }
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99
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100 /* welp, we tried */
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101 return false;
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102 }
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104 } // namespace glib