4bf7ce7d99
* Better error message for spack providers fixes #1355 `spack providers` now outputs a sensible error message if non-virtual specs are provided as arguments: ``` $ spack providers mpi zlib petsc ==> Error: non-virtual specs cannot be part of the query [zlib, petsc] ``` Formatting of the output changed slightly. * Calling 'spack providers' without arguments print the virtual pkg list Also, the error message in case of a wrong parameter has been improved to show the list of valid packages. * Avoid printing headers if stdout is not a tty * The provider list is formatted with colify if not in a tty * Added a test to check the list of providers returned from the command |
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