pub fn read_config(flag: Option<&Path>) -> Result<Option<Table>, SettingsError>Expand description
Reads and parses config.toml, or Ok(None) if none applies. An explicit
flag path must exist (a read error is a usage error); otherwise
$PLUGMEM_CONFIG, then the platform path from
crate::default_config_path, are read only if present. Wrappers call this once, then pass the table to
Settings::from_table and also read their own keys (batch size, workers)
from it.