Add ruff version with long version display

crates/ruff_cli/build.rs

@@ -0,0 +1,79 @@
+use std::{fs, path::Path, path::PathBuf, process::Command};
+
+fn main() {
+    // The workspace root directory is not available without walking up the tree
+    // https://github.com/rust-lang/cargo/issues/3946
+    let workspace_root = Path::new(&std::env::var("CARGO_MANIFEST_DIR").unwrap())
+        .join("..")
+        .join("..");
+
+    commit_info(workspace_root);
+
+    #[allow(clippy::disallowed_methods)]
+    let target = std::env::var("TARGET").unwrap();
+    println!("cargo:rustc-env=RUST_HOST_TARGET={target}");
+}
+
+fn commit_info(workspace_root: PathBuf) {
+    let git_dir = workspace_root.join(".git");
+    if !git_dir.exists() {
+        return;
+    }
+
+    let git_head_path = git_dir.join("HEAD");
+    println!(
+        "cargo:rerun-if-changed={}",
+        git_head_path.as_path().display()
+    );
+
+    let git_head_contents = fs::read_to_string(git_head_path);
+    if let Ok(git_head_contents) = git_head_contents {
+        // The contents are either a commit or a reference in the following formats
+        // "<commit>""
+        // "ref <ref>""
+        // If a commit, checking if the HEAD file has changed is sufficient
+        // If a ref we want to add the head file for that ref to rebuild on commit
+        let mut git_ref_parts = git_head_contents.split_whitespace();
+        git_ref_parts.next();
+        if let Some(git_ref) = git_ref_parts.next() {
+            let git_ref_path = git_dir.join(git_ref);
+            println!(
+                "cargo:rerun-if-changed={}",
+                git_ref_path.as_path().display()
+            );
+        }
+    }
+
+    let output = match Command::new("git")
+        .arg("log")
+        .arg("-1")
+        .arg("--date=short")
+        .arg("--abbrev=9")
+        .arg("--format=%H %h %cd %(describe)")
+        .output()
+    {
+        Ok(output) if output.status.success() => output,
+        _ => return,
+    };
+    let stdout = String::from_utf8(output.stdout).unwrap();
+    let mut parts = stdout.split_whitespace();
+    let mut next = || parts.next().unwrap();
+    println!("cargo:rustc-env=RUFF_COMMIT_HASH={}", next());
+    println!("cargo:rustc-env=RUFF_COMMIT_SHORT_HASH={}", next());
+    println!("cargo:rustc-env=RUFF_COMMIT_DATE={}", next());
+
+    // Describe can fail for some commits
+    // https://git-scm.com/docs/pretty-formats#Documentation/pretty-formats.txt-emdescribeoptionsem
+    if let Some(describe) = parts.next() {
+        let mut describe_parts = describe.split('-');
+        println!(
+            "cargo:rustc-env=RUFF_LAST_TAG={}",
+            describe_parts.next().unwrap()
+        );
+        // If this is the tagged commit, this component will be missing
+        println!(
+            "cargo:rustc-env=RUFF_LAST_TAG_DISTANCE={}",
+            describe_parts.next().unwrap_or("0")
+        );
+    }
+}

crates/ruff_cli/src/args.rs

@@ -69,6 +69,11 @@ pub enum Command {
     #[doc(hidden)]
     #[clap(hide = true)]
     Format(FormatCommand),
+    /// Display Ruff's version
+    Version {
+        #[arg(long, value_enum, default_value = "text")]
+        output_format: HelpFormat,
+    },
 }
 
 // The `Parser` derive is for ruff_dev, for ruff_cli `Args` would be sufficient

crates/ruff_cli/src/commands/mod.rs

@@ -9,3 +9,4 @@ pub(crate) mod linter;
 pub(crate) mod rule;
 pub(crate) mod show_files;
 pub(crate) mod show_settings;
+pub(crate) mod version;

crates/ruff_cli/src/commands/version.rs

@@ -0,0 +1,21 @@
+use std::io::{self, BufWriter, Write};
+
+use anyhow::Result;
+
+use crate::args::HelpFormat;
+
+/// Display version information
+pub(crate) fn version(output_format: HelpFormat) -> Result<()> {
+    let mut stdout = BufWriter::new(io::stdout().lock());
+    let version_info = crate::version::version();
+
+    match output_format {
+        HelpFormat::Text => {
+            writeln!(stdout, "{}", &version_info)?;
+        }
+        HelpFormat::Json => {
+            serde_json::to_writer_pretty(stdout, &version_info)?;
+        }
+    };
+    Ok(())
+}

crates/ruff_cli/src/lib.rs

@@ -1,3 +1,5 @@
+#![allow(clippy::print_stdout)]
+
 use std::fs::File;
 use std::io::{self, stdout, BufWriter, Write};
 use std::path::{Path, PathBuf};
@@ -27,6 +29,7 @@ mod panic;
 mod printer;
 pub mod resolve;
 mod stdin;
+mod version;
 
 #[derive(Copy, Clone)]
 pub enum ExitStatus {
@@ -134,6 +137,10 @@ pub fn run(
     set_up_logging(&log_level)?;
 
     match command {
+        Command::Version { output_format } => {
+            commands::version::version(output_format)?;
+            Ok(ExitStatus::Success)
+        }
         Command::Rule { rule, all, format } => {
             if all {
                 commands::rule::rules(format)?;

crates/ruff_cli/src/version.rs

@@ -0,0 +1,69 @@
+//! Code for representing Ruff's release version number.
+use serde::Serialize;
+use std::fmt;
+
+/// Information about the git repository where Ruff was built from.
+#[derive(Serialize)]
+pub(crate) struct CommitInfo {
+    short_commit_hash: String,
+    commit_hash: String,
+    commit_date: String,
+    last_tag: String,
+    commits_since_last_tag: u32,
+}
+
+/// Ruff's version.
+#[derive(Serialize)]
+pub(crate) struct VersionInfo {
+    /// Ruff's version, such as "0.5.1"
+    version: String,
+    /// Information about the git commit we may have been built from.
+    ///
+    /// `None` if not built from a git repo or if retrieval failed.
+    commit_info: Option<CommitInfo>,
+}
+
+impl fmt::Display for VersionInfo {
+    /// Formatted version information: "<version>[+<commits>] (<commit> <date>)"
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{}", self.version)?;
+
+        if let Some(ref ci) = self.commit_info {
+            if ci.commits_since_last_tag > 0 {
+                write!(f, "+{}", ci.commits_since_last_tag)?;
+            }
+            write!(f, " ({} {})", ci.short_commit_hash, ci.commit_date)?;
+        }
+
+        Ok(())
+    }
+}
+
+/// Returns information about Ruff's version.
+pub(crate) fn version() -> VersionInfo {
+    macro_rules! option_env_str {
+        ($name:expr) => {
+            option_env!($name).map(|s| s.to_string())
+        };
+    }
+
+    // This version is pulled from Cargo.toml and set by Cargo
+    let version = option_env_str!("CARGO_PKG_VERSION").unwrap();
+
+    // Commit info is pulled from git and set by `build.rs`
+    let commit_info = option_env_str!("RUFF_COMMIT_HASH").map(|commit_hash| CommitInfo {
+        short_commit_hash: option_env_str!("RUFF_COMMIT_SHORT_HASH").unwrap(),
+        commit_hash,
+        commit_date: option_env_str!("RUFF_COMMIT_DATE").unwrap(),
+        last_tag: option_env_str!("RUFF_LAST_TAG").unwrap(),
+        commits_since_last_tag: option_env_str!("RUFF_LAST_TAG_DISTANCE")
+            .unwrap()
+            .parse::<u32>()
+            .unwrap(),
+    });
+
+    VersionInfo {
+        version,
+        commit_info,
+    }
+}

docs/configuration.md

@@ -156,12 +156,13 @@ Ruff: An extremely fast Python linter.
 Usage: ruff [OPTIONS] <COMMAND>
 
 Commands:
-  check   Run Ruff on the given files or directories (default)
-  rule    Explain a rule (or all rules)
-  config  List or describe the available configuration options
-  linter  List all supported upstream linters
-  clean   Clear any caches in the current directory and any subdirectories
-  help    Print this message or the help of the given subcommand(s)
+  check    Run Ruff on the given files or directories (default)
+  rule     Explain a rule (or all rules)
+  config   List or describe the available configuration options
+  linter   List all supported upstream linters
+  clean    Clear any caches in the current directory and any subdirectories
+  version  Display Ruff's version
+  help     Print this message or the help of the given subcommand(s)
 
 Options:
   -h, --help     Print help