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habits of good build scripts
Good build scripts...
A build script captures the details that developers probably don’t need to know right
from the start about how to compile and package an application, like BeatBox. The
information isn’t trapped in one person’s head; it’s captured in a version-controlled,
repeatable process. But what exactly should a standard build script do?
...generate documentation
Remember those description tags in the
build file? Just type ant -projecthelp
and you’ll get a nice printout of what
targets are available, a description of each,
and what the default target is (which is
usually what you want to use).
...compile your project
Most importantly, your build scripts compile the code in your project. And in most scripts, you want a
single command that you can run to handle everything, from setup to compilation to packaging.
Here you can
see the target
dependencies in
action: our build
script tells
Ant to run the
dist target by
default, but
in order to do
that, it has to
run compile, and
in order to do
that, it has to
run init.
Your build tool probably has a way
to generate documentation about
itself and your project, even if
you’re not using Ant and Java.
228 Chapter 6 ½
File Edit Window Help Build
hfsd> ant
Buildfile: build.xml
You’ll probably add tasks to your own
build scripts, but all build scripts
should do a few common things...
init:
[mkdir] Created dir: C:\Users\Developer\workspaces\HFSD\BeatBox\bin
[mkdir] Created dir: C:\Users\Developer\workspaces\HFSD\BeatBox\dist
compile:
[javac] Compiling 4 source files to C:\Users\Developer\workspaces\HFSD\BeatBox\bin
dist:
[jar] Building jar: C:\Users\Developer\workspaces\HFSD\BeatBox\dist\BeatBox.jar
BUILD SUCCESSFUL
Total time: 16 seconds
hfsd>
File Edit Window Help Huh?
hfsd> ant -projecthelp
Buildfile: build.xml
Main targets:
clean Cleans up the build and dist directories.
compile Compiles the source files to the bin directory.
dist Packages up BeatBox into BeatBox.jar
init Creates the needed directories.
Default target: dist
hfsd>
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