Implement release subcommand in clippy_dev

This is a QoL improvement for doing releases. The `release bump_version`
subcommand increments the version in all relevant `Cargo.toml` files. The
`release commit` command will only work with the new Josh syncs. Until then the
old way, using `git log` has to be used.

Cargo.toml

@@ -1,6 +1,8 @@
 [package]
 name = "clippy"
+# begin autogenerated version
 version = "0.1.84"
+# end autogenerated version
 description = "A bunch of helpful lints to avoid common pitfalls in Rust"
 repository = "https://github.com/rust-lang/rust-clippy"
 readme = "README.md"

clippy_config/Cargo.toml

@@ -1,6 +1,8 @@
 [package]
 name = "clippy_config"
+# begin autogenerated version
 version = "0.1.84"
+# end autogenerated version
 edition = "2021"
 publish = false
 

clippy_dev/src/lib.rs

@@ -18,6 +18,7 @@ pub mod dogfood;
 pub mod fmt;
 pub mod lint;
 pub mod new_lint;
+pub mod release;
 pub mod serve;
 pub mod setup;
 pub mod sync;

clippy_dev/src/main.rs

@@ -3,7 +3,7 @@
 #![warn(rust_2018_idioms, unused_lifetimes)]
 
 use clap::{Args, Parser, Subcommand};
-use clippy_dev::{dogfood, fmt, lint, new_lint, serve, setup, sync, update_lints, utils};
+use clippy_dev::{dogfood, fmt, lint, new_lint, release, serve, setup, sync, update_lints, utils};
 use std::convert::Infallible;
 
 fn main() {
@@ -84,6 +84,10 @@ fn main() {
                 force,
             } => sync::rustc_push(repo_path, &user, &branch, force),
         },
+        DevCommand::Release(ReleaseCommand { subcommand }) => match subcommand {
+            ReleaseSubcommand::BumpVersion => release::bump_version(),
+            ReleaseSubcommand::Commit { repo_path, branch } => release::rustc_clippy_commit(repo_path, branch),
+        },
     }
 }
 
@@ -236,6 +240,8 @@ enum DevCommand {
     },
     /// Sync between the rust repo and the Clippy repo
     Sync(SyncCommand),
+    /// Manage Clippy releases
+    Release(ReleaseCommand),
 }
 
 #[derive(Args)]
@@ -330,3 +336,23 @@ enum SyncSubcommand {
         force: bool,
     },
 }
+
+#[derive(Args)]
+struct ReleaseCommand {
+    #[command(subcommand)]
+    subcommand: ReleaseSubcommand,
+}
+
+#[derive(Subcommand)]
+enum ReleaseSubcommand {
+    #[command(name = "bump_version")]
+    /// Bump the version in the Cargo.toml files
+    BumpVersion,
+    /// Print the Clippy commit in the rustc repo for the specified branch
+    Commit {
+        /// The path to a rustc repo to look for the commit
+        repo_path: String,
+        /// For which branch to print the commit
+        branch: release::Branch,
+    },
+}

clippy_dev/src/release.rs

@@ -0,0 +1,76 @@
+use std::fmt::{Display, Write};
+use std::path::Path;
+
+use crate::sync::PUSH_PR_DESCRIPTION;
+use crate::utils::{clippy_version, replace_region_in_file, UpdateMode};
+
+use clap::ValueEnum;
+use xshell::{cmd, Shell};
+
+const CARGO_TOML_FILES: [&str; 5] = [
+    "clippy_config/Cargo.toml",
+    "clippy_lints/Cargo.toml",
+    "clippy_utils/Cargo.toml",
+    "declare_clippy_lint/Cargo.toml",
+    "Cargo.toml",
+];
+
+pub fn bump_version() {
+    let (minor, mut patch) = clippy_version();
+    patch += 1;
+    for file in &CARGO_TOML_FILES {
+        replace_region_in_file(
+            UpdateMode::Change,
+            Path::new(file),
+            "# begin autogenerated version\n",
+            "# end autogenerated version",
+            |res| {
+                writeln!(res, "version = \"0.{minor}.{patch}\"").unwrap();
+            },
+        );
+    }
+}
+
+#[derive(ValueEnum, Copy, Clone)]
+pub enum Branch {
+    Stable,
+    Beta,
+    Master,
+}
+
+impl Display for Branch {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Branch::Stable => write!(f, "stable"),
+            Branch::Beta => write!(f, "beta"),
+            Branch::Master => write!(f, "master"),
+        }
+    }
+}
+
+pub fn rustc_clippy_commit(rustc_path: String, branch: Branch) {
+    let sh = Shell::new().expect("failed to create shell");
+    sh.change_dir(rustc_path);
+
+    let base = branch.to_string();
+    cmd!(sh, "git fetch https://github.com/rust-lang/rust {base}")
+        .run()
+        .expect("failed to fetch base commit");
+    let last_rustup_commit = cmd!(
+        sh,
+        "git log -1 --merges --grep=\"{PUSH_PR_DESCRIPTION}\" FETCH_HEAD -- src/tools/clippy"
+    )
+    .read()
+    .expect("failed to run git log");
+
+    let commit = last_rustup_commit
+        .lines()
+        .find(|c| c.contains("Sync from Clippy commit:"))
+        .expect("no commit found")
+        .trim()
+        .rsplit_once('@')
+        .expect("no commit hash found")
+        .1;
+
+    println!("{commit}");
+}

clippy_lints/Cargo.toml

@@ -1,6 +1,8 @@
 [package]
 name = "clippy_lints"
+# begin autogenerated version
 version = "0.1.84"
+# end autogenerated version
 description = "A bunch of helpful lints to avoid common pitfalls in Rust"
 repository = "https://github.com/rust-lang/rust-clippy"
 readme = "README.md"

clippy_utils/Cargo.toml

@@ -1,6 +1,8 @@
 [package]
 name = "clippy_utils"
+# begin autogenerated version
 version = "0.1.84"
+# end autogenerated version
 edition = "2021"
 description = "Helpful tools for writing lints, provided as they are used in Clippy"
 repository = "https://github.com/rust-lang/rust-clippy"