Add uusi-extract to print the name and version of a package#14
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uusi-extract to print the name and version of a package
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The
uusi-extractcommand reads in the.cabalfile and prints out the version or package name, depending on the chosen command line option.This provides a better way to programmatically get the package name or the version of a package, so that in particular whitespace doesn't matter. The intended use case for this is Arch Linux's
ghcpackage, where the library information needs to be extracted from the included.cabalfiles.The actions are distinguished via two options which map to functions in the
Optionsclass. If an option is set, the corresponding function is added to the returned list. If that list contains no functions or more than one, an appropriate error is raised.The functions take in the
GenericPackageDescriptionthat's the same for everything, and return the extractedTextfor printing.The implementation has been tested with up to 9.14 and includes CPP where necessary.
Solves #12
Depends on #13 for the CI