Print and format authors from ["name "] lists

This utility is meant to be used in a pipeline with toml-path, for extracting only the names of authors without the emails

$ toml-path --raw-output .package.authors Cargo.toml | authors --names
Adam Gaia

• Without any flags, this utility is redundant

$ authors "foo <[email protected]>, foo2 <[email protected]>"
foo <[email protected]>, foo2 <[email protected]>

• Print names only

$ authors --names "foo <[email protected]>, foo2 <[email protected]>"
foo, foo2

• Print emails only

$ authors --emails "foo <[email protected]>, foo2 <[email protected]>"
[email protected], [email protected]

• Piping to stdin instead of proving an input argument works too

$ echo "foo <[email protected]>, foo2 <[email protected]>" | authors --names
foo, foo2