source show: include pypi and additional information about order

[abn]

$ poetry source show -v
 name       : pypi-simple             
 url        : https://pypi.org/simple 
 default    : no                      
 secondary  : no                      

 name       : pypi                     
 url        : https://pypi.org/simple/ 
 default    : no                       
 secondary  : yes                      

Poetry will search all of the above package sources when searching for packages.

All other things equal, for a give package that is available from multiple sources, it will be preferred in the order listed above.

For example, if a package foo is available in both pypi-simple and pypi, Poetry will select pypi-simple.

You can override this, by explicitly specify the source when adding the package.

    $ poetry add --source pypi foo

Alternatively, you can set all your custom sources as secondary.

[github-actions[bot]]

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