LibVT+Terminal: Add color scheme support

This commit introduces color scheme support to Terminal. These are found
in `/res/terminal_colors` and the default color scheme can be set in
`~/.config/Terminal.ini`. Furthermore, a combo box is added for
setting the color scheme at runtime.

The previously used default color scheme has been added to
`/res/terminal-colors/Default.ini`.

To make the implementation more compatible with other color schemes,
`TerminalWidget` now supports overriding the default foreground and
background colors.

2 files changed, 37 insertions, 1 deletions

diff --git a/Userland/Applications/Terminal/TerminalSettingsWindow.gml b/Userland/Applications/Terminal/TerminalSettingsWindow.gml
index 07b8400c56..6c906fd463 100644
--- a/Userland/Applications/Terminal/TerminalSettingsWindow.gml
+++ b/Userland/Applications/Terminal/TerminalSettingsWindow.gml
@@ -60,4 +60,17 @@
             orientation: "Horizontal"
         }
     }
+
+    @GUI::GroupBox {
+        title: "Color scheme"
+        shrink_to_fit: true
+
+        layout: @GUI::VerticalBoxLayout {
+            margins: [6, 16, 6, 6]
+        }
+
+        @GUI::ComboBox {
+            name: "color_scheme_combo"
+        }
+    }
 }
diff --git a/Userland/Applications/Terminal/main.cpp b/Userland/Applications/Terminal/main.cpp
index 846b0ffdd2..dd8fc9e325 100644
--- a/Userland/Applications/Terminal/main.cpp
+++ b/Userland/Applications/Terminal/main.cpp
@@ -4,10 +4,12 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
+#include <AK/QuickSort.h>
 #include <AK/URL.h>
 #include <Applications/Terminal/TerminalSettingsWindowGML.h>
 #include <LibCore/ArgsParser.h>
 #include <LibCore/ConfigFile.h>
+#include <LibCore/DirIterator.h>
 #include <LibCore/File.h>
 #include <LibDesktop/Launcher.h>
 #include <LibGUI/Action.h>
@@ -16,9 +18,11 @@
 #include <LibGUI/BoxLayout.h>
 #include <LibGUI/Button.h>
 #include <LibGUI/CheckBox.h>
+#include <LibGUI/ComboBox.h>
 #include <LibGUI/Event.h>
 #include <LibGUI/FontPicker.h>
 #include <LibGUI/Icon.h>
+#include <LibGUI/ItemListModel.h>
 #include <LibGUI/Menu.h>
 #include <LibGUI/Menubar.h>
 #include <LibGUI/OpacitySlider.h>
@@ -105,7 +109,7 @@ static RefPtr<GUI::Window> create_settings_window(VT::TerminalWidget& terminal)
     window->set_window_type(GUI::WindowType::ToolWindow);
     window->set_title("Terminal settings");
     window->set_resizable(false);
-    window->resize(200, 210);
+    window->resize(200, 240);
     window->center_within(*terminal.window());
 
     auto& settings = window->set_main_widget<GUI::Widget>();
@@ -149,6 +153,25 @@ static RefPtr<GUI::Window> create_settings_window(VT::TerminalWidget& terminal)
         terminal.set_max_history_size(value);
     };
 
+    // The settings window takes a reference to this vector, so it needs to outlive this scope.
+    // As long as we ensure that only one settings window may be open at a time (which we do),
+    // this should cause no problems.
+    static Vector<String> color_scheme_names;
+    color_scheme_names.clear();
+    Core::DirIterator iterator("/res/terminal-colors", Core::DirIterator::SkipParentAndBaseDir);
+    while (iterator.has_next()) {
+        auto path = iterator.next_path();
+        path.replace(".ini", "");
+        color_scheme_names.append(path);
+    }
+    quick_sort(color_scheme_names);
+    auto& color_scheme_combo = *settings.find_descendant_of_type_named<GUI::ComboBox>("color_scheme_combo");
+    color_scheme_combo.set_only_allow_values_from_model(true);
+    color_scheme_combo.set_model(*GUI::ItemListModel<String>::create(color_scheme_names));
+    color_scheme_combo.set_selected_index(color_scheme_names.find_first_index(terminal.color_scheme_name()).value());
+    color_scheme_combo.on_change = [&](auto&, const GUI::ModelIndex& index) {
+        terminal.set_color_scheme(index.data().as_string());
+    };
     return window;
 }