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We have seen some examples of build files that are not very useful currently. But even so, we can see that there are specific structures and elements to assist in the construction of a build file and therefore the definition of the process for the build. Here we will look at the various opportunities this structure affords us when creating a build file. You can investigate the allowed structure of a build file through the NAnt XML Schema (XSD file), which comes with the source code for NAnt. Alternatively, the following script will output the XSD to a file of your choosing: < xml version="1.0" encoding="utf-8" > <project name="NAntSchema" default="help"> <description>Output a copy of the NAnt Schema</description> <property name="file" value="NAnt.xsd"/> <target name="help" description="About this build file"> <echo message="This outputs the NAnt XSD to a file."/> <echo message="Override the 'file' property to change the location."/> </target>
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CHAPTER 2 DISSECTING NANT
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<target name="go" description="Create the NAnt Schema XSD file"> <nantschema output="${file}"/> </target> </project>
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The Project
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The project node is the root node of a build file. This node can contain any number of <property> nodes, <task> nodes, and <target> nodes. Generally, the rest of the build file is now defined either as a property, or as a target, or as a task within a target. The documentation for NAnt describes the project node attributes as shown in Table 2-3. Table 2-3. Project Node Attributes
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The name of the project. The default target to use when no target is supplied. The base directory from which all path calculations are done. Current directory is the default.
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Required
No Yes No
These are quite straightforward options. In fact, NAnt will run fine without the default attribute, though generally it will not execute anything, of course! Other points to note regarding the project node are All properties and tasks that are directly below the project node are executed prior to any specified target. All properties and tasks that are directly below the project node are always executed during a build. Therefore, it makes sense to use the project node to hold global properties for the rest of the execution. It also makes sense to place tasks inside a target node so that they can be bypassed when necessary for example, during testing. The reverse of this statement is also true and may suit your circumstances. Apart from these features, the project node is quite dull. Many more exciting things can be achieved with the target nodes.
The Target
Targets are used to modularize the build file. A target contains zero or more tasks to be completed in a sequence. As we have learned, each project node usually has a default target that will be invoked when none is specified by the command line. In the Hello World example, the default target was go. The documentation for NAnt describes the attributes of a target as shown in Table 2-4.
CHAPTER 2 DISSECTING NANT
Table 2-4. Target Node Attributes
Attribute
name description depends if unless
Description
The name of the target A short description of this target s function A comma-separated list of names of targets on which this depends The name of the property that must be set in order for this target to execute The name of the property that must not be set in order for this target to execute
Required
Yes No No No No
When you are constructing a build file, <targets> are excellent ways of organizing your thoughts. We will look at a proposed set of targets at the end of this chapter that can correspond to the defined sections of the processes we have already outlined. By modularizing tasks in this way, we ensure that individual sections of a build script can be Tested in isolation by invoking the specific target from the command line (do not forget the projecthelp switch) Included in or removed from the process as desired Segregated along specific lines, such as platform, environment, configuration Generated for multiple solutions via automated means in itself such as an XSLT transformation There is a great deal of strength in the target node, and its attributes are worth considering in more depth.
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