A guidebook mod for Minecraft NeoForge, designed to provide in-game guides for other mods. Ageratum offers rich Markdown
rendering, i18n localization, and an extensible custom syntax/component system.

Documentation

Features

Core Markdown Support

✅ Block Elements

• ATX headings (# ~ ######) and Setext headings (underline style)
• Paragraphs and line breaks
• Ordered, unordered, and task lists (multi-level nesting)
• Blockquotes (multi-level nesting)
• Fenced code blocks (backticks and tildes) and indented code blocks
• Horizontal rules
• Tables with alignment settings
• Images (namespace-local references)

✅ Inline Elements

• bold, italic, strikethrough
• Inline code spans (multi-backtick support)
• Links and autolinks
• Escape character support
• Custom color tags
• Hover and Click Events (<hover> and <click> tags)

✅ Advanced Features

• Reference link definitions and reference link syntax
• Automatic link expansion
• Code block line numbers
• Table column alignment (left/center/right)

Internationalization (i18n)

• Documents organized by ageratum/<language_code>/ (e.g., en_us, zh_cn)
• Default fallback to en_us if localized version missing
• Full support for multi-byte characters (Chinese, Japanese, etc.)

Extension Syntax

Two block-level extension syntaxes for custom components:

1. Colon Syntax

::: info
This is an info box.
:::

::: tip
This is a tip.
:::

::: warning
This is a warning.
:::

::: danger
This is a danger warning.
:::

2. Tag Syntax

<namespace:component key="value" param=123>
Block content supports Markdown syntax.
</namespace:component>

<namespace:component/>
Self-closing form without content.

Namespace can be omitted (defaults to ageratum:).

Built-in Extension Components

• ageratum:info - Blue info box
• ageratum:tip - Green tip box
• ageratum:warning - Orange warning box
• ageratum:danger - Red danger box

Hover and Click Events

Support interactive text that allows players to hover for tooltips or click to perform actions.

Hover Events (<hover>)

Display tooltip text when hovering over text:

<hover type="SHOW_TEXT" data="This is the tooltip">Hover over me</hover>

Supported Types:

• SHOW_TEXT - Display plain text tooltip (data is the tooltip content)

Click Events (<click>)

Execute an action when clicking on text:

<click type="OPEN_URL" data="https://example.com">Click to open link</click>
<click type="COPY_TO_CLIPBOARD" data="Text to copy">Click to copy</click>
<click type="SUGGEST_COMMAND" data="/say hello">Click to suggest command</click>

Supported Types:

• OPEN_URL - Open a URL (data is the complete URL)
• COPY_TO_CLIPBOARD - Copy text to clipboard (data is the text to copy)
• SUGGEST_COMMAND - Suggest a command in chat (data is the command text)

Combining Styles

You can combine multiple styles in the same text:

<hover type="SHOW_TEXT" data="This is a tooltip"><click type="OPEN_URL" data="https://example.com">Click and hover on me!</click></hover>

Recipe Component (<recipe/>)

Use the recipe extension to render recipes directly inside Markdown documents:

<recipe id="minecraft:acacia_boat"/>

• id: required, target recipe ResourceLocation
• Built-in support: RecipeType.CRAFTING (crafting table recipes)
• Rendering behavior: each input slot displays the first candidate item from its Ingredient
• Fallback behavior: if client level is unavailable, recipe is missing, or no factory matches, the component renders with no visible height

You can register additional recipe component factories through AgeratumRegistries.RECIPE_COMPONENT_FACTORIES:

public static final DeferredHolder<MDRecipeComponent.RecipeComponentFactory<?>, MDRecipeComponent.RecipeComponentFactory<?>> SMELTING =
    AgeratumRegistries.RECIPE_COMPONENT_FACTORIES.register(
        "smelting",
        () -> MDRecipeComponent.RecipeComponentFactory.create(RecipeType.SMELTING, MDSmeltingRecipeComponent::new)
    );

Structure NBT Component (<structure/>)

Use the structure extension to render a summary, top-down block preview, and bounded NBT tree for .nbt structure files directly inside documents:

<structure id="minecraft:village/plains/houses/plains_small_house_1"/>

<structure id="./test.nbt"/>

• id / path: required, target structure file ResourceLocation
• maxDepth: optional, maximum expansion depth, default 2
• maxEntries: optional, maximum number of keys/list entries shown per level, default 12
• Relative paths are supported and resolved against the current document directory, including .nbt files placed next to the Markdown document inside the resource pack; in preview mode the matching file is loaded from run/ageratum_review/
• The component first shows structure metadata such as size, palette, block count, and entity count, then renders a top-down block preview followed by a depth-limited NBT tree
• Hovering a block in the preview shows its block ID, structure coordinates, palette index, and whether it carries block-entity NBT

Preloading & Caching

• Automatically scans and pre-parses Markdown documents to MDComponent lists on resource load
• Opens cached components immediately without parsing delay
• Auto-refreshes cache on resource reload

Cross-side Guide Opening

// Client: open directly
Ageratum.openGuide(ResourceLocation location);

// Server: notify client via network packet
Ageratum.

openGuide(ResourceLocation location);

Project Structure

Directory Layout

src/main/java/dev/anvilcraft/resource/ageratum/
├── Ageratum.java                           // Main mod class + command registration
├── GuideDocumentLoader.java                // Document loading utils
├── GuideDocumentCache.java                 // Preload cache & reload listener
│
├── client/
│   ├── AgeratumClient.java                 // Client hooks (reserved)
│   ├── gui/
│   │   └── GuideScreen.java                // Guide reading GUI
│   └── feat/markdown/
│       ├── MarkdownParser.java             // Markdown block-level parser
│       ├── BuiltinExtensionComponents.java // Built-in extension registration
│       ├── BlockExtensionState.java        // Block extension state machine
│       ├── SelfClosingBlockExtensionState.java
│       ├── ExtensionParamParser.java       // Parameter parsing utility
│       ├── MDExtensionContext.java         // Extension execution context
│       ├── MDExtensionComponentFactory.java // Extension factory interface
│       └── component/
│           ├── MDComponent.java            // Base class + inline parsing
│           ├── MDTextComponent.java        // Plain text paragraphs
│           ├── MDHeaderComponent.java      // Headings
│           ├── MDCodeBlockComponent.java   // Code blocks
│           ├── MDListComponent.java        // Lists (inc. task lists)
│           ├── MDQuoteComponent.java       // Blockquotes
│           ├── MDTableComponent.java       // Tables
│           ├── MDImageComponent.java       // Images
│           ├── MDHorizontalRuleComponent.java
│           └── MDNoticeBoxComponent.java   // Notice box container
│
└── network/
    ├── AgeratumNetwork.java                // Network registration & dispatch
    └── OpenGuidePayload.java               // Guide open network packet

Design Principles

• Separation of Concerns: Each class handles a single responsibility
• No Oversized Classes: Longest files ~400 lines, all inner classes extracted
• Comprehensive Documentation: Chinese Javadoc for all public APIs, inline comments for complex logic
• Extensibility: Register custom block types via registerExtensionComponent()

Usage Guide

Players

Open guides with client command:

/ageratum <namespace> [file]

Examples:
/ageratum ageratum                  # Opens ageratum:en_us/index.md
/ageratum mymod guide              # Opens mymod:en_us/guide.md
/ageratum mymod zh_cn/tutorial     # Opens mymod:zh_cn/tutorial.md

Tab completion supported for namespaces and file names.

Developers

Register Custom Extension

Use registration methods described in NeoForge docs:

1. DeferredRegister (recommended)
2. RegisterEvent (advanced usage)

public static final DeferredRegister<MDExtensionComponentFactory> EXT_COMPONENT_FACTORIES =
    AgeratumRegistries.createExtensionComponentFactoryRegister("your_modid");

public static final DeferredHolder<MDExtensionComponentFactory, MDExtensionComponentFactory> CUSTOM =
    EXT_COMPONENT_FACTORIES.register(
        "custom", () ->
            context -> new MyComponent(context.renderedContent(), context.params())
    );

// In your mod constructor
EXT_COMPONENT_FACTORIES.

register(modEventBus);

Register Custom Inline Style Parser

Inline style parsers are registered through INLINE_STYLE_PARSER_REGISTRY_KEY. MDComponent queries this registry and resolves matches by
position + parser priority.

package com.example.mymod.client.markdown;

import dev.anvilcraft.resource.ageratum.client.feat.markdown.component.MDInlineStyleParser;
import dev.anvilcraft.resource.ageratum.client.registries.AgeratumRegistries;
import net.minecraft.network.chat.Style;
import net.neoforged.neoforge.registries.DeferredHolder;
import net.neoforged.neoforge.registries.DeferredRegister;

import java.util.regex.Pattern;

public final class MyInlineStyleParsers {
    // Use your own modid here, not ageratum
    public static final DeferredRegister<MDInlineStyleParser> INLINE_STYLE_PARSERS = DeferredRegister.create(
        AgeratumRegistries.INLINE_STYLE_PARSER_REGISTRY_KEY,
        "mymod"
    );

    // Example tag: <rainbow>text</rainbow>
    public static final DeferredHolder<MDInlineStyleParser, MDInlineStyleParser> RAINBOW =
        INLINE_STYLE_PARSERS.register(
            "rainbow",
            () -> MDInlineStyleParser.create(
                100, // smaller value = higher precedence at same position
                Pattern.compile("<rainbow>"),
                "</rainbow>",
                (Style parentStyle, java.util.regex.Matcher matcher) -> parentStyle.withColor(0xFF55FF)
            )
        );

    private MyInlineStyleParsers() {
    }
}

Register it in your client init:

public class MyModClient {
    public MyModClient(IEventBus modEventBus) {
        MyInlineStyleParsers.INLINE_STYLE_PARSERS.register(modEventBus);
    }
}

Markdown usage:

normal text <rainbow>colored text</rainbow> normal text

See full guide: docs/inline-style-parser-example.en.md.

Add Documentation

Create in resource pack:

assets/<namespace>/ageratum/<language>/index.md
assets/<namespace>/ageratum/en_us/index.md
assets/<namespace>/ageratum/zh_cn/index.md

License

• Code unless otherwise stated default to our LICENSE file(LGPL-3.0)
• Non-Code assets (Located here) go by our ASSET_LICENSE file(ARR)