In perl I would say:
map {
die "missing library $1" if /\$\{libs\.(.+)\.classpath\}/
} @classpath;
and get the feature that if property expansion failed, the build would halt
with a meaningful error message.
In ant:
<filterchain>
<expandproperties/># doesn't support failonerror attribute
</filterchain>
<fail message="missing library ${missing.library}">
<condition property="missing.library"> # doesn't support property
attribute
<matches pattern="libs\.(.+)\.classpath"
string="${libs.list.classpath}"/> # doesn't support property attribute
</condition>
</fail>
<path path="${classpath}">
<existing/> # does not fail if unset pathelement
</path>
How can I fail cleanly if the classpath could not be loaded?
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