cargo_pup_lint_impl 0.1.6

// This product includes software developed at Datadog (https://www.datadoghq.com/) Copyright 2024 Datadog, Inc.

/// Lets us create two lints in the fashion of declare_lint!,
/// but with a variant for Deny and a variant for Warn, using
/// the same lint name. We also emit a struct that wraps these lints
/// up with a get_by_severity wrapper, so that we can have multiple
/// lint declarations in the same file.
///
/// This lets us do dynamic lint level selection at runtime
/// based on the user's configuration.
#[macro_export]
macro_rules! declare_variable_severity_lint {
    ($(#[$attr:meta])* $vis: vis, $NAME: ident, $NAME_DENY: ident, $NAME_WARN: ident, $desc: expr) => (
        // Deny severity: Directly define the lint with the Deny severity.
        $(#[$attr])*
        $vis static $NAME_DENY: &rustc_session::lint::Lint = &rustc_session::lint::Lint {
            name: stringify!($NAME),  // The name for the lint (denoted by `$NAME`)
            default_level: rustc_session::lint::Level::Deny,  // Set severity to Deny
            desc: $desc,  // Use the description passed into the macro
            is_externally_loaded: false,
            ..rustc_session::lint::Lint::default_fields_for_macro()  // Default values for other fields
        };

        // Warn severity: Directly define the lint with the Warn severity.
        $(#[$attr])*
        $vis static $NAME_WARN: &rustc_session::lint::Lint = &rustc_session::lint::Lint {
            name: stringify!($NAME),  // The name for the lint (denoted by `$NAME`)
            default_level: rustc_session::lint::Level::Warn,  // Set severity to Warn
            desc: $desc,  // Use the description passed into the macro
            is_externally_loaded: false,
            ..rustc_session::lint::Lint::default_fields_for_macro()  // Default values for other fields
        };

        // Create a wrapper type to allow accessing the lint based on severity
        // Note that we need to allow BIG_CAPS_NAMES for the lint name emitted by rustc to have
        // underscores between segments
        #[allow(non_camel_case_types)]
        $vis struct $NAME;

        impl $NAME {
            /// Get the appropriate lint based on severity
            pub fn get_by_severity(severity: cargo_pup_lint_config::Severity) -> &'static rustc_session::lint::Lint {
                match severity {
                    cargo_pup_lint_config::Severity::Warn => $NAME_WARN,
                    cargo_pup_lint_config::Severity::Error => $NAME_DENY,
                }
            }
        }
    );
}