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General Task Features
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We learned about tasks in the previous chapter when we discussed how to get the most out of NAnt. Before we look at the specific tasks we are interested in, let us define in detail what a task is. A task is an XML tag inside a NAnt build file that instructs the NAnt executable to perform a specific action. For example, you may recognize the following: <echo message="I am an example of a task"/> This task tells NAnt to echo the message to the listener/logger a very simple example. We will look at the internals of task construction when we need to build our own task in 7. For now, it is important to recognize the features of a task. First, each task has a specific tag name rather than an attribute to describe its function (for example, we do not use <task type="echo"/>). Second, tasks are customized in two ways: by using attributes and by using nested elements. Let us briefly consider these features.
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CHAPTER 3 IMPORTANT NANT TASKS
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Using Attributes
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Most tasks have individual attributes to provide the level of customization necessary for the specific task. By way of comparison, take a look at the <echo> and <mkiisdir> tasks. Each task has some standard attributes, which are listed in the individual task documentation. We can also see what those tasks are by using Reflector to examine the source code of nant.core.dll. All tasks for NAnt inherit from the Task abstract class. By reflecting over the Task class we can see the code signatures shown in Figure 3-1.
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Figure 3-1. Reflecting over the Task class The important features here are the following properties, which directly translate to attributes for the task: FailOnError. The default of this property is true. The property specifies whether NAnt should halt execution and report a problem if the task fails. This property translates to the failonerror attribute. IfDefined. The default of this property is true. The property specifies whether the task should execute if the expression in the if attribute evaluates to true. This property translates to the if attribute. UnlessDefined. This is the reverse of the IfDefined property; its default value is false. The property specifies whether the task should execute if the expression in the unless attribute evaluates to false. This property translates to the unless attribute.
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Verbose. The default value of the Verbose property is false. This allows us to provide a more verbose description of task execution if the property evaluates to true. This property translates to the verbose attribute. All of these properties are marked with the attributes TaskAttribute and BooleanValidator. We will explore these in 7 in terms of implementation, but for our current purposes this means that all tasks have these four properties defined and available for use if we apply a Boolean value to them in the task implementation within a build file. Apart from the documentation for tasks describing the attributes of the task in question, it can be very useful to use Reflector (or open the source code) to examine the behaviors and requirements of task attributes.
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Using Nested Elements
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A task can also be customized by including support for a variety of nested elements. The set of NAnt tasks contains many useful examples of this. The available set of nested elements are held in the NAnt.Core.Types namespace. Using Reflector, we can see the available types, as shown in Figure 3-2.
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Figure 3-2. Reflecting over the NAnt.Core.Types namespace
CHAPTER 3 IMPORTANT NANT TASKS
Caution Unfortunately, sometimes the types are named differently according to the context of the task. This is a positive thing in terms of understanding the purpose of the element, but when you are approaching the task for the first time, it can be confusing. As a simple example, compare the <copy> task to the <style> task. <copy> uses the name fileset as the name of its fileset element, which is very simple, but <style> uses the name infiles to refer to its fileset element, which makes it less obvious that the nested element has the same features and behaviors of a regular fileset element.
Some tasks contain several structures of this kind. These features are particularly prevalent among the specific tasks that have been used to automate core parts of the process, such as the automation of Visual Studio and the use of NDoc. Again, we will not go into depth here; the current documentation is a better starting point. However, we will take a look at the most common of these nested elements: the fileset.
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