Add command argument for fonts installed on the client.

Author: Darkhax

Common/src/main/java/net/darkhax/bookshelf/impl/commands/args/FontArgument.java

@@ -0,0 +1,84 @@
+package net.darkhax.bookshelf.impl.commands.args;
+
+import com.google.gson.JsonObject;
+import com.mojang.brigadier.StringReader;
+import com.mojang.brigadier.arguments.ArgumentType;
+import com.mojang.brigadier.builder.RequiredArgumentBuilder;
+import com.mojang.brigadier.context.CommandContext;
+import com.mojang.brigadier.exceptions.CommandSyntaxException;
+import com.mojang.brigadier.suggestion.Suggestions;
+import com.mojang.brigadier.suggestion.SuggestionsBuilder;
+import net.darkhax.bookshelf.api.Services;
+import net.darkhax.bookshelf.api.util.TextHelper;
+import net.minecraft.commands.CommandSourceStack;
+import net.minecraft.commands.Commands;
+import net.minecraft.commands.SharedSuggestionProvider;
+import net.minecraft.commands.synchronization.ArgumentSerializer;
+import net.minecraft.network.FriendlyByteBuf;
+import net.minecraft.resources.ResourceLocation;
+
+import java.util.Collection;
+import java.util.List;
+import java.util.concurrent.CompletableFuture;
+import java.util.stream.Collectors;
+
+public class FontArgument implements ArgumentType<ResourceLocation> {
+
+    public static final ArgumentSerializer<FontArgument> SERIALIZER = new Serializer();
+    public static final FontArgument ARGUMENT = new FontArgument();
+
+    private static final Collection<ResourceLocation> VANILLA_FONTS = List.of(new ResourceLocation("fake_font"), TextHelper.FONT_DEFAULT, TextHelper.FONT_ALT, TextHelper.FONT_UNIFORM, TextHelper.FONT_ILLAGER);
+    private static final Collection<String> EXAMPLES = VANILLA_FONTS.stream().map(ResourceLocation::toString).collect(Collectors.toList());
+
+    public static ResourceLocation getFont(CommandContext<CommandSourceStack> context) {
+
+        return context.getArgument("font", ResourceLocation.class);
+    }
+
+    public static RequiredArgumentBuilder<CommandSourceStack, ResourceLocation> argument() {
+
+        return Commands.argument("font", FontArgument.ARGUMENT);
+    }
+
+    @Override
+    public ResourceLocation parse(final StringReader reader) throws CommandSyntaxException {
+
+        return ResourceLocation.read(reader);
+    }
+
+    @Override
+    public Collection<String> getExamples() {
+
+        return EXAMPLES;
+    }
+
+    @Override
+    public <S> CompletableFuture<Suggestions> listSuggestions(CommandContext<S> context, SuggestionsBuilder builder) {
+
+        if (Services.PLATFORM.isPhysicalClient()) {
+
+            return SharedSuggestionProvider.suggestResource(TextHelper.getRegisteredFonts(), builder);
+        }
+
+        return SharedSuggestionProvider.suggestResource(VANILLA_FONTS, builder);
+    }
+
+    static class Serializer implements ArgumentSerializer<FontArgument> {
+
+        @Override
+        public void serializeToNetwork(FontArgument fontArgument, FriendlyByteBuf friendlyByteBuf) {
+
+        }
+
+        @Override
+        public FontArgument deserializeFromNetwork(FriendlyByteBuf friendlyByteBuf) {
+
+            return FontArgument.ARGUMENT;
+        }
+
+        @Override
+        public void serializeToJson(FontArgument fontArgument, JsonObject jsonObject) {
+
+        }
+    }
+}