feat: Expose cargo's new styling

This mirrors what the API in rust-lang/cargo#12655.  I'm hoping to have
the `anstyle` consts be a public crate owned by the cargo team in the
future after which we'll refactor to re-export it.

See rust-lang/cargo#12578 for adding the style.

Cargo.toml

@@ -41,6 +41,7 @@ default = ["clap"]
 clap = ["dep:clap"]
 
 [dependencies]
+anstyle = "1.0.3"
 cargo_metadata = { version = "0.17", optional = true }
 clap = { version = "4.4.1", default-features = false, features = ["std", "derive"], optional = true }
 

src/lib.rs

@@ -45,6 +45,8 @@ mod features;
 mod manifest;
 mod workspace;
 
+pub mod style;
+
 pub use features::*;
 pub use manifest::*;
 pub use workspace::*;

src/style.rs

@@ -0,0 +1,23 @@
+use anstyle::*;
+
+pub const NOP: Style = Style::new();
+pub const HEADER: Style = AnsiColor::Green.on_default().effects(Effects::BOLD);
+pub const USAGE: Style = AnsiColor::Green.on_default().effects(Effects::BOLD);
+pub const LITERAL: Style = AnsiColor::Cyan.on_default().effects(Effects::BOLD);
+pub const PLACEHOLDER: Style = AnsiColor::Cyan.on_default();
+pub const ERROR: Style = AnsiColor::Red.on_default().effects(Effects::BOLD);
+pub const WARN: Style = AnsiColor::Yellow.on_default().effects(Effects::BOLD);
+pub const NOTE: Style = AnsiColor::Cyan.on_default().effects(Effects::BOLD);
+pub const GOOD: Style = AnsiColor::Green.on_default().effects(Effects::BOLD);
+pub const VALID: Style = AnsiColor::Cyan.on_default().effects(Effects::BOLD);
+pub const INVALID: Style = AnsiColor::Yellow.on_default().effects(Effects::BOLD);
+
+#[cfg(feature = "clap")]
+pub const CLAP_STYLING: clap::builder::styling::Styles = clap::builder::styling::Styles::styled()
+    .header(HEADER)
+    .usage(USAGE)
+    .literal(LITERAL)
+    .placeholder(PLACEHOLDER)
+    .error(ERROR)
+    .valid(VALID)
+    .invalid(INVALID);