style: share linting options across packages

Move the Rust and Clippy linting options into the Cargo manifest and
share them with all the packages in the workspace. This ensures a
consistent style in all packages.

Cargo.toml

@@ -19,6 +19,13 @@ members = [
     "xtask"
 ]
 
+[workspace.lints.clippy]
+use_self = "deny"
+multiple_inherent_impl = "deny"
+
+[lints]
+workspace = true
+
 [profile.release]
 lto = true
 codegen-units = 1

src/main.rs

@@ -1,5 +1,3 @@
-#![deny(clippy::use_self, clippy::multiple_inherent_impl)]
-
 #[macro_use]
 extern crate cursive;
 #[macro_use]

xtask/Cargo.toml

@@ -13,3 +13,6 @@ clap = "4.4.12"
 [dependencies.ncspot]
 default-features = false
 path = ".."
+
+[lints]
+workspace = true

xtask/src/main.rs

@@ -20,8 +20,8 @@ impl TryFrom<&ArgMatches> for XTaskSubcommand {
     fn try_from(value: &ArgMatches) -> Result<Self, Self::Error> {
         if let Some(subcommand) = value.subcommand() {
             match subcommand.0 {
-                "generate-manpage" => Ok(XTaskSubcommand::GenerateManpage),
-                "generate-shell-completion" => Ok(XTaskSubcommand::GenerateShellCompletion),
+                "generate-manpage" => Ok(Self::GenerateManpage),
+                "generate-shell-completion" => Ok(Self::GenerateShellCompletion),
                 _ => Err(Error::new(clap::error::ErrorKind::InvalidSubcommand)),
             }
         } else {