Add reason field support to mandatory deps (#397)

gradle.properties

@@ -30,7 +30,7 @@ jetbrains_annotations_version=24.0.1
 slf4j_api_version=2.0.7
 apache_maven_artifact_version=3.8.5
 jarjar_version=0.4.0
-fancy_mod_loader_version=2.0.3
+fancy_mod_loader_version=2.0.4
 mojang_logging_version=1.1.1
 log4j_version=2.19.0
 guava_version=31.1.2-jre

src/main/java/net/neoforged/neoforge/common/I18nExtension.java

@@ -12,6 +12,7 @@
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Objects;
+import java.util.Optional;
 import java.util.function.BiConsumer;
 import java.util.function.Supplier;
 import java.util.regex.Pattern;
@@ -55,6 +56,8 @@ public class I18nExtension {
         customFactories.put("i18ntranslate", (name, formatString, locale) -> new CustomReadOnlyFormat((stringBuffer, o) -> stringBuffer.append(I18nExtension.parseMessage((String) o))));
         // {0,ornull,fml.absent} -> append String value of o, or i18n string 'fml.absent' (message format transforms nulls into the string literal "null")
         customFactories.put("ornull", ((name, formatString, locale) -> new CustomReadOnlyFormat((stringBuffer, o) -> stringBuffer.append(Objects.equals(String.valueOf(o), "null") ? I18nExtension.parseMessage(formatString) : String.valueOf(o)))));
+        // {0,optional,[prefix]} -> append String value of o if the optional is present, with an optional prefix at the start
+        customFactories.put("optional", (name, formatString, locale) -> new CustomReadOnlyFormat((stringBuffer, o) -> ((Optional<?>) o).ifPresent(val -> stringBuffer.append(formatString == null ? "" : formatString).append(val))));
     }
 
     private static void parseException(final String formatString, final StringBuffer stringBuffer, final Object objectToParse) {

src/main/resources/assets/neoforge/lang/en_us.json

@@ -66,7 +66,7 @@
   "fml.modloading.errorduringevent":"{0,modinfo,name} ({0,modinfo,id}) encountered an error during the {1,lower} event phase\n\u00a77{2,exc,msg}",
   "fml.modloading.failedtoloadforge": "Failed to load NeoForge",
 
-  "fml.modloading.missingdependency": "Mod \u00a7e{4}\u00a7r requires \u00a76{3}\u00a7r \u00a7o{5,vr}\u00a7r\n\u00a77Currently, \u00a76{3}\u00a7r\u00a77 is \u00a7o{6,i18n,fml.messages.artifactversion.ornotinstalled}",
+  "fml.modloading.missingdependency": "Mod \u00a7e{4}\u00a7r requires \u00a76{3}\u00a7r \u00a7o{5,vr}\u00a7r\n\u00a77Currently, \u00a76{3}\u00a7r\u00a77 is \u00a7o{6,i18n,fml.messages.artifactversion.ornotinstalled}§r\n{7,optional,§7Reason for the dependency: §r}",
   "fml.modloading.missingdependency.optional": "Mod \u00a7e{4}\u00a7r only supports \u00a73{3}\u00a7r \u00a7o{5,vr}\u00a7r\n\u00a77Currently, \u00a73{3}\u00a7r\u00a77 is \u00a7o{6}",
   "fml.modloading.incompatiblemod": "Mod \u00a7e{4}\u00a7r is §cincompatible§r with \u00a73{3}\u00a7r \u00a7o{5,vr}\u00a7r\n\u00a77Currently, \u00a73{3}\u00a7r\u00a77 is \u00a7o{6}§r\n§7The reason is:§r §o{7,i18ntranslate}§r",
   "fml.modloading.discouragedmod": "Mod \u00a7e{3}\u00a7r §ddiscourages§r the use of \u00a73{2}\u00a7r \u00a7o{4,vr}\u00a7r\n\u00a77Currently, \u00a73{2}\u00a7r\u00a77 is \u00a7o{5}§r\n§7The reason is:§r §o{6,i18ntranslate}§r",