feat: linux-only system dictionary spell checking (#6703)

Reviewed-by: Nerixyz <nerixdev@outlook.de>

src/widgets/settingspages/ExternalToolsPage.cpp

@@ -1,5 +1,7 @@
 #include "widgets/settingspages/ExternalToolsPage.hpp"
 
+#include "controllers/spellcheck/SpellChecker.hpp"
+#include "singletons/Paths.hpp"
 #include "singletons/Settings.hpp"
 #include "util/Clipboard.hpp"
 #include "util/Helpers.hpp"
@@ -16,6 +18,8 @@
 #include <QMessageBox>
 #include <QPushButton>
 
+#include <algorithm>
+
 namespace chatterino {
 
 namespace {
@@ -227,6 +231,52 @@ void ExternalToolsPage::initLayout(GeneralPageView &layout)
         layout.addLayout(buttonLayout);
     }
 
+#ifdef CHATTERINO_WITH_SPELLCHECK
+    {
+        // auto *form = new QFormLayout;
+        layout.addTitle("Spell checker (experimental)");
+
+        layout.addDescription(
+            u"Check the spelling of words in the input box of splits."
+            " Chatterino does not include dictionaries - they have to "
+            "be downloaded or created manually. Chatterino expects "
+            "Hunspell "
+            "dictionaries in " %
+            formatRichNamedLink(getApp()->getPaths().dictionariesDirectory,
+                                getApp()->getPaths().dictionariesDirectory) %
+            u". The file index.aff has to contain the affixes and "
+            u"index.dic "
+            u"must contain the dictionary (subject to change).");
+
+        SettingWidget::checkbox("Check spelling by default",
+                                s.enableSpellChecking)
+            ->setTooltip("Check the spelling of words in the input box of all "
+                         "splits by default.")
+            ->addTo(layout);
+
+        auto toItem =
+            [](const DictionaryInfo &dict) -> std::pair<QString, QVariant> {
+            return {
+                dict.name,
+                dict.path,
+            };
+        };
+        std::vector<std::pair<QString, QVariant>> dictList{{"None", ""}};
+
+        std::ranges::transform(
+            getApp()->getSpellChecker()->getSystemDictionaries(),
+            std::back_inserter(dictList), toItem);
+
+        if (dictList.size() > 1)
+        {
+            SettingWidget::dropdown(
+                "Fallback spellchecking dictionary (requires restart)",
+                s.spellCheckingFallback, dictList)
+                ->addTo(layout);
+        }
+    }
+#endif
+
     layout.addStretch();
 }
 

src/widgets/settingspages/GeneralPage.cpp

@@ -481,21 +481,6 @@ void GeneralPage::initLayout(GeneralPageView &layout)
             "yours is successfully sent in the matching channel.")
         ->addTo(layout);
 
-#ifdef CHATTERINO_WITH_SPELLCHECK
-    SettingWidget::checkbox("Check spelling by default (experimental)",
-                            s.enableSpellChecking)
-        ->setTooltip(
-            u"Check the spelling of words in the input box of all splits by "
-            "default. This can be overwritten per split in the context menu."
-            " Chatterino does not include dictionaries - they have to "
-            "be downloaded or created manually. Chatterino expects Hunspell "
-            "dictionaries in '" %
-            getApp()->getPaths().dictionariesDirectory %
-            u"'. The file index.aff has to contain the affixes and index.dic "
-            u"must contain the dictionary (subject to change).")
-        ->addTo(layout);
-#endif
-
     layout.addTitle("Messages");
 
     SettingWidget::checkbox("Separate with lines", s.separateMessages)