Example output:
Expected one of:
--count INTEGER (alias: -c)
--debug, --no-debug (alias: -d)
--files STRING (alias: -f) (may be given more than once)
--verbose, --no-verbose (alias: -v)
Prompt
======
When we raise ParseError, include all of the options we could
potentially accept, alongside their types and aliases. For example,
the switches `[foo: :string, bar: :integer]` and `aliases: [b: :bar]`,
the error message should say:
Expected one of:
--foo STRING
--bar INTEGER (alias: -b)
Furthermore, for types that are :keep (which default to string), you should
add:
--bar INTEGER (alias: -b) (may be given more than once)
And boolean ones accept no arguments, so they should be written as:
--baz, --no-baz
Sort all of them alphabetically.
José Valim
8b1922150b