Go Proto Sugar

Extends the default protoc-gen-go with some sugar shortcuts.

Short Enum

Proto enum values must be uniquely named in each namespace, however the Go code adds an extra prefix, so that:

enum foo {
	FOO_UNSPECIFIED = 0;
	FOO_A = 1;
}

becomes package.Foo_FOO_A

With this enum extension:

• The const package.Foo_A is created
• The map package.Foo_name_short works like the inbuilt package.Foo_name
• The map package.Foo_value_short works like the inbuilt package.Foo_value
• The map package.Foo_value_either is a merger of the short and long values, useful for input data
• Method ShortString() returns the _name_short string.

When the parameter sql_driver is true, an additional set of methods make the Enum work with SQL drivers directly:

• Value() method returns the ShortString() (Short string as SQL enums are already namespaced)
• Scan(interface{}) method decodes as flexibly as it can, using either string representation.

This only works when the first value has the _UNSPECIFIED suffix, which indicates the Buf naming standard has been used. (a future version could be more flexible)

Expose OneOf

The inbuilt oneof implementation uses an isFoo and unexposed fields to ensure that OneOf values are of the correct type. The developers continue to argue about fixing that implementation but believe that it's a bad setup, as oneOf is 'just validation'. This would be fine, but it's not how they built it, so look...

Anyway, this extension just copies isFoo to IsFoo so that you can use that type elsewhere.