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ANT COMMAND LINE OPTIONS
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Some options require more explanation of Ant before they make sense. In particular, the two options related to properties are not relevant until we explore Ant s properties in chapter 3. Likewise, we don t introduce listeners and loggers until chapter 13, so let s ignore those options for now. Just keep in mind that it is possible to write Java classes that get told when targets are executed, or that get fed all the output from the tasks as they execute, a feature that is the basis for integrating Ant into IDEs. 2.7.1 Specifying which build file to run Perhaps the most important option for Ant is -buildfile. This option lets you control which build file Ant uses, allowing you to divide the targets of a project into multiple files, and select the appropriate build file depending on your actions. A shortcut to -buildfile is -f. To invoke our existing project, we just name it immediately after the -f or -buildfile argument:
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ant -buildfile build.xml compile
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This is exactly equivalent to calling ant compile with no file specified. If for some reason the current directory was somewhere in the source tree, which is sometimes the case when you are editing text from a console application such as vi, emacs, or even edit, then you can refer to a build file by passing in the appropriate relative file name for your platform, such as ../../../build.xml or ..\..\..\build.xml. This is fiddly. It is better to use the -find option, which must be followed by the name of a build file. This variant does something very special: it searches up the directory tree to find the first build file in a parent directory of that name, and invokes it. With this option, when you are deep down the source tree editing files, you can easily invoke the project build with the simple command:
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ant -find build.xml
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Controlling the amount of information provided We stated that we want to reduce the amount of information provided when we invoke Ant. Getting rid of the [java] prefix is easy: we run the build file with the -emacs option; this omits the task-name prefix from all lines printed. The option is called -emacs because the output is now in the emacs format for invoked tools, which enables that and other editors to locate the lines on which errors occurred. When calling Ant from any IDE that lacks built-in support, the -emacs option may tighten the integration. For our exercise, we only want to change the presentation from the command line, which is simple enough:
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[secondbuild]$ ant -emacs execute Buildfile: build.xml init: compile: execute:
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GETTING STARTED WITH ANT
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a b /home/ant/Projects/secondbuild BUILD SUCCESSFUL Total time: 2 seconds.
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This leaves the next half of the problem, hiding all the output entirely. Three of the Ant options control how much information is output when Ant runs. Two of these (-verbose and -debug) progressively increase the amount. The verbose option is useful when you are curious about how Ant works, or why a build isn t behaving. The debug option includes all the normal and verbose output, and much more low level information, primarily only of interest to Ant developers. The -quiet option reduces the amount of information to a success message or errors:
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[secondbuild]$ ant -quiet execute BUILD SUCCESSFUL Total time: 2 seconds
This leaves us with no way of telling if the program worked, unless we can infer it from the time to execute. Would adding an <echo> statement in the execute target help Not by default. One of the attributes of echo is the level attribute: error, warning, info, verbose, and debug control the amount of information that appears. The default value info ensures that echoed messages appear in normal builds, or the two levels of even more information, verbose and debug. By inserting an echo statement into our execute target with the level set to warning, we ensure that even when the build is running in quiet mode the output appears. The Ant task declaration
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