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We can revisit the <ifnot> task to see how a function is called: <ifnot test="${property::exists('project.name')}"> <fail message="Please enter a project.name to run this file." /> </ifnot> Within the test attribute, the function call must return a Boolean value or the script cannot be processed. Next the ${} (dollar, curly brace, curly brace) syntax is used to encapsulate the function call with the :: (colon, colon) notation, differentiating the function type and specific method. Finally, if you are using a property name inside a function call (which is very likely), then the property name should be wrapped in '' (single quotes). Functions also support the use of operators such as equals, less than, add, and subtract. The following function, which must also return a Boolean, is straight from the NAnt documentation and uses three functions to determine whether to call the <csc> task. In this case, the criterion for calling the task is whether the assembly has been written to (in other words, generated) in the last hour: <csc target="library" output="out.dll" if="${datetime::now() - file::get-last-write-time('out.dll')) > timespan::from-hours(1)}"> ... </csc> In this example, the operators are in bold. The NAnt documentation contains up-to-date information on available functions and operators. Keep in mind, as usual, that the introduction of functions such as these into build scripts imbues the scripts with some domain logic, or basis for decision making, rather than just containing process logic. In fact, there will always be a need to have this sort of functionality, but do be mindful of the complexity, and therefore risk, introduced here.
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In 7 we will see how NAnt can be extended, and how easy this can be, through the creation of assemblies that NAnt can load and reflect over (using the <loadtasks> task). NAnt can also be extended more simply through the use of a script task. A script task is the embedding of code within a build file using C# or another .NET language (except C++). The code can then be executed as a target or as a function call, depending on the implementation. These two implementation possibilities can be seen in the following Hello World script tasks. First, we can define a function that returns a string ("Hello World!" in this case) within a build file. Consider the following build file: < xml version="1.0" > <project> <script language="C#" prefix="etomic" > <code><![CDATA[ [Function("hello-world")] public static string HelloWorld() {
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return "Hello World!"; } ]]></code> </script> <echo message='${etomic::hello-world()}'/> </project> In this file we create a script block using the <script> task, which contains a code element with the actual C# code. In this case we are using a simple method to return a string. We have placed an attribute on the method to make NAnt aware of the function and its name. Additionally, we have included a prefix for the code functions: although there is only one here, the script block could conceivably contain many functions. Therefore, when the function is called in the <echo> task, it is called with prefix::function-name notation, in other words etomic:: hello-world. We have not required any other namespaces, but in fact the <script> task supports nested elements for imports and references and by default supports the following namespaces: System, System.Collections, System.Collections.Specialized, System.IO, System.Text, System.Text.RegularExpressions, and NAnt.Core. The output from the execution of the build file is as follows: ---------- NAnt ---------NAnt 0.85 Copyright (C) 2001-2004 Gerry Shaw http://nant.sourceforge.net Buildfile: file:///ScriptFunction.build [script] Scanning assembly "2qn-tswa" for extensions. [echo] Hello World! BUILD SUCCEEDED Total time: 0.2 seconds. Output completed (0 sec consumed) - Normal Termination As the output shows, NAnt compiles the code into a temporary assembly and then loads the assembly for use throughout the build file. You can then see the correct execution of the function as part of the <echo> task call. The next type of script task is the creation of an actual target. This is analogous to the creation of an actual custom task. This time, we need to add a little extra scaffolding to the build script. Consider the following: < xml version="1.0" > <project> <target name="HelloWorld"> <script language="C#"> <code><![CDATA[ public static void ScriptMain(Project project)
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