should be customizable without having to alter your build script. An easy way to do that is by allowing them to be overwritten through environment variables. So if I want a custom build dir, I would just run
BUILD="/tmp/build" ./ttautohint-build.sh
To make that possible, you want to have your code work like this
if [ -z "$BUILD" ]
then
BUILD="$HOME/ttfautohint-build"
fi
so if $BUILD is already set, just take the value and don't set your own one. Only set a value if no value is set in environment.
And there exists a much easier way to write the code above, which is even POSIX shell conform and thus supported by all shells:
: "${BUILD:="$HOME/ttfautohint-build"}"
That's it. It will set $BUILD only if not already set.
Variables like
should be customizable without having to alter your build script. An easy way to do that is by allowing them to be overwritten through environment variables. So if I want a custom build dir, I would just run
To make that possible, you want to have your code work like this
so if
$BUILDis already set, just take the value and don't set your own one. Only set a value if no value is set in environment.And there exists a much easier way to write the code above, which is even POSIX shell conform and thus supported by all shells:
That's it. It will set
$BUILDonly if not already set.