Customizing Topics
Topics.txt

Natural Docs has two files called `Topics.txt`: one in its Config directory, and one in your project directory. These control the topic behavior and keywords Natural Docs uses.

You should edit the one in your project directory whenever possible. It keeps your changes separate and easier to manage, plus you don’t have to reapply them whenever you upgrade. Editing the one in Natural Docs’ Config directory would be better only if you’re using Natural Docs with a lot of projects and would like the changes to apply everywhere.

Topic Types vs. Keywords

It’s important to understand the difference between topic types and keywords. Topic types have their own indexes and behavior settings. You’ll reference them by name when dealing with indexes in the menu file or prototype detection in the language file, but not when documenting your code unless you make their names keywords as well.

You use keywords when documenting your code. There can be many keywords per topic type, and they are completely interchangable.

Suppose you document a class with the `Class` keyword and a struct with `Struct`. They are both keywords for the Class topic type by default, so they will appear in the same index. If you wanted structs to have their own index, you would add a topic type for structs and change the `Struct` keyword to point to it.

Adding Topic Types

If you want to be able to document something in Natural Docs doesn’t handle by default, you want to create your own topic type for it. Let’s say you’re working on a video game and you want to document all the sound effects because you want to keep track of what each one is for and have an index of them. You’d add this to your topics file:

    Topic Type: Sound Effect
       Plural: Sound Effects
       Keywords:
          sound
          sound effect

Sound effects can now be documented with the `sound` or `sound effect` keywords, and they’ll get their own index. The `Plural` line just specifies the plural name of the topic type. It isn’t required, but Natural Docs will use it in some places where the plural would sound more natural, like when grouping topics or naming indexes on the menu.

Here are a couple of other things you may want to add:

    Topic Type: Sound Effect
       Plural: Sound Effects
       Scope: Always Global
       Keywords:
          sound, sounds
          sound effect, sound effects

You can set the scope behavior of the topic type. Your options are:

Normal | Topics stay within the current scope.
Start | Topics start a new scope for all the topics beneath it, like class topics.
End | Topics reset the scope back to global for all the topics beneath it.
Always Global | Topics are defined as global, but do not change the scope for any other topics.

Here we set it to `Always Global` so that if we document one as part of a class, it will still be global yet will not break the class’ scope. In other words, we can always link to it with just its name instead of needing something like `<Class.Sound>`.

The other thing we did was add plural keywords, which you do by using a comma after an existing keyword. These keywords are used for list topics so we don’t have to document each one individually with the full syntax.

There are more options, these are just the most important ones. See the full syntax reference for the rest.

Prototypes

If you’d like to collect prototypes for your new topic type, you have to do that by editing `Languages.txt`.

Changing Keywords
Adding and Changing

If you’re defining your own topic type or editing the main topics file, you simply add to the keywords list:

    Topic Type: Sound Effect
       Keywords:
          sound, sounds
          sound effect, sound effects

It doesn’t matter if the keyword was previously defined for a different topic type. Just define it again and the definition will change.

If you want to add keywords to one of the main topic types from the project file, use `Alter Topic Type` instead:

    Alter Topic Type: General
       Keywords:
          note
          notes

Natural Docs will keep a list of the main file’s topic types in your project file so that you can do this easily.

Ignoring

Sometimes a keyword just gets in the way. It’s too common in your comments and Natural Docs keeps accidentally picking them up as topics when that isn’t what you wanted. You can get rid of keywords completely by either deleting them from the main file or putting this in your project file:

    Ignore Keywords:
       about
       title

If you only have a few, you can use this syntax as well:

    Ignore Keywords: note, notes, title

Altering Behavior

You can change the behavior of any topic type defined in the main file via your project file. Just use `Alter Topic Type` and redefine any property.

    Alter Topic Type: Constant
       Scope: Always Global

Natural Docs will keep a list of the main file’s topic types in your project file so you can do this easily. See the syntax reference below for a full list of your options.

Syntax Reference

    Ignore Keywords: [keyword], [keyword] ...
       [keyword]
       [keyword], [keyword]
       ...

Ignores the keywords so that they’re not recognized as Natural Docs topics anymore. Can be specified as a list on the same line and/or following like a normal Keywords section.

    Topic Type: [name]
    Alter Topic Type: [name]

Creates a new topic type or alters an existing one. The name can only contain letters, numbers, spaces, and these characters: `. - ‘ /`. It isn’t case sensitive, although the original case is remembered for presentation.

There are a number of default types that must be defined in the main file, but they will be listed there since it may change between versions. The default types can have their keywords or behaviors changed, though, either by editing the default file or by overriding them in the user file.

Properties

    Plural: [name]

Specifies the plural name of the topic type. Defaults to the singular name. Has the same restrictions as the topic type name.

    Index: [yes|no]

Whether the topic type gets an index. Defaults to yes.

    Scope: [normal|start|end|always global]

How the topic affects scope. Defaults to normal.

Normal | Topics stay within the current scope.
Start | Topics start a new scope for all the topics beneath it, like class topics.
End | Topics reset the scope back to global for all the topics beneath it.
Always Global | Topics are defined as global, but do not change the scope for any other topics.

    Class Hierarchy: [yes|no]

Whether the topic is part of the class hierarchy. Defaults to no.

    Page Title if First: [yes|no]

Whether the title of this topic becomes the page title if it is the first topic in a file. Defaults to no.

    Break Lists: [yes|no]

Whether list topics should be broken into individual topics in the output. Defaults to no.

    Can Group With: [topic type], [topic type], ...

Lists the topic types that can be grouped with this one in the output. If two or more topic types often appear together, like Functions and Properties, this will allow them to be grouped together under one heading if it would cause too many groups otherwise.

    Keywords:
       [keyword]
       [keyword], [plural keyword]
       ...

A list of the topic type’s keywords. Each line after the heading is the keyword and optionally its plural form. This continues until the next line in “`keyword: value`” format.

- Keywords can only have letters, numbers, and spaces. No punctuation or symbols are allowed.
- Keywords are not case sensitive.
- Subsequent keyword sections add to the list. They don’t replace it.
- Keywords can be redefined by appearing in later keyword sections.

| Copyright © 2003-2008 Greg Valure