Function registry 

fn registry<'gctx>(
    gctx: &'gctx GlobalContext,
    source_ids: &RegistrySourceIds,
    token_from_cmdline: Option<Secret<&str>>,
    reg_or_index: Option<&RegistryOrIndex>,
    force_update: bool,
    token_required: Option<Operation<'_>>,
) -> CargoResult<(Registry, RegistrySource<'gctx>)>

Returns the Registry and Source based on command-line and config settings.

• source_ids: The source IDs for the registry. It contains the original source ID and the replacement source ID.
• token_from_cmdline: The token from the command-line. If not set, uses the token from the config.
• index: The index URL from the command-line.
• registry: The registry name from the command-line. If neither registry, or index are set, then uses crates-io.
• force_update: If true, forces the index to be updated.
• token_required: If true, the token will be set.