Add commit info to version display

Cargo.toml

@@ -21,7 +21,7 @@ anstream = "0.6.15"
 anyhow = "1.0.86"
 assert_cmd = { version = "2.0.16", features = ["color"] }
 axoupdater = { version = "0.8.1", default-features = false, features = [ "github_releases"] }
-clap = { version = "4.5.16", features = ["derive", "env"] }
+clap = { version = "4.5.16", features = ["derive", "env", "string", "wrap_help"] }
 clap_complete = "4.5.37"
 ctrlc = "3.4.5"
 dunce = "1.0.5"
@@ -67,6 +67,9 @@ insta-cmd = "0.6.0"
 predicates = "3.1.2"
 regex = "1.11.0"
 
+[build-dependencies]
+fs-err = "2.11.0"
+
 [lints.rust]
 dead_code = "allow"
 

build.rs

@@ -0,0 +1,124 @@
+/* MIT License
+
+Copyright (c) 2023 Astral Software Inc.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+use std::{
+    path::{Path, PathBuf},
+    process::Command,
+};
+
+use fs_err as fs;
+
+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()).to_path_buf();
+
+    commit_info(&workspace_root);
+}
+
+fn commit_info(workspace_root: &Path) {
+    // If not in a git repository, do not attempt to retrieve commit information
+    let git_dir = workspace_root.join(".git");
+    if !git_dir.exists() {
+        return;
+    }
+
+    if let Some(git_head_path) = git_head(&git_dir) {
+        println!("cargo:rerun-if-changed={}", git_head_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>" when the head is detached
+            // - "ref <ref>" when working on a branch
+            // If a commit, checking if the HEAD file has changed is sufficient
+            // If a ref, we need 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.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=PREFLIGIT_COMMIT_HASH={}", next());
+    println!("cargo:rustc-env=PREFLIGIT_COMMIT_SHORT_HASH={}", next());
+    println!("cargo:rustc-env=PREFLIGIT_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=PREFLIGIT_LAST_TAG={}",
+            describe_parts.next().unwrap()
+        );
+        // If this is the tagged commit, this component will be missing
+        println!(
+            "cargo:rustc-env=PREFLIGIT_LAST_TAG_DISTANCE={}",
+            describe_parts.next().unwrap_or("0")
+        );
+    }
+}
+
+fn git_head(git_dir: &Path) -> Option<PathBuf> {
+    // The typical case is a standard git repository.
+    let git_head_path = git_dir.join("HEAD");
+    if git_head_path.exists() {
+        return Some(git_head_path);
+    }
+    if !git_dir.is_file() {
+        return None;
+    }
+    // If `.git/HEAD` doesn't exist and `.git` is actually a file,
+    // then let's try to attempt to read it as a worktree. If it's
+    // a worktree, then its contents will look like this, e.g.:
+    //
+    //     gitdir: /home/andrew/astral/uv/main/.git/worktrees/pr2
+    //
+    // And the HEAD file we want to watch will be at:
+    //
+    //     /home/andrew/astral/uv/main/.git/worktrees/pr2/HEAD
+    let contents = fs::read_to_string(git_dir).ok()?;
+    let (label, worktree_path) = contents.split_once(':')?;
+    if label != "gitdir" {
+        return None;
+    }
+    let worktree_path = worktree_path.trim();
+    Some(PathBuf::from(worktree_path))
+}

src/cli/mod.rs

@@ -79,7 +79,7 @@ impl From<ColorChoice> for anstream::ColorChoice {
 #[command(
     name = "prefligit",
     author,
-    version,
+    long_version = crate::version::version(),
     about = "pre-commit reimplemented in Rust"
 )]
 #[command(propagate_version = true)]

src/main.rs

@@ -30,6 +30,7 @@ mod process;
 mod profiler;
 mod run;
 mod store;
+mod version;
 mod warnings;
 
 #[derive(Debug, Default, Clone, Copy, PartialEq, Eq)]
@@ -128,7 +129,7 @@ async fn run(mut cli: Cli) -> Result<ExitStatus> {
         cli.command = Some(Command::Run(Box::new(cli.run_args.clone())));
     }
 
-    debug!("prefligit: {}", env!("CARGO_PKG_VERSION"));
+    debug!("prefligit: {}", version::version());
 
     match get_root().await {
         Ok(root) => {
@@ -144,8 +145,6 @@ async fn run(mut cli: Cli) -> Result<ExitStatus> {
         }
     }
 
-    // TODO: read git commit info
-
     macro_rules! show_settings {
         ($arg:expr) => {
             if cli.globals.show_settings {

src/version.rs

@@ -0,0 +1,99 @@
+/* MIT License
+
+Copyright (c) 2023 Astral Software Inc.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+// See also <https://github.com/astral-sh/ruff/blob/8118d29419055b779719cc96cdf3dacb29ac47c9/crates/ruff/src/version.rs>
+use std::fmt;
+
+use serde::Serialize;
+
+/// Information about the git repository where prefligit was built from.
+#[derive(Serialize)]
+pub(crate) struct CommitInfo {
+    short_commit_hash: String,
+    commit_hash: String,
+    commit_date: String,
+    last_tag: Option<String>,
+    commits_since_last_tag: u32,
+}
+
+/// prefligit's version.
+#[derive(Serialize)]
+pub struct VersionInfo {
+    /// prefligit's version, such as "0.0.6"
+    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(())
+    }
+}
+
+impl From<VersionInfo> for clap::builder::Str {
+    fn from(val: VersionInfo) -> Self {
+        val.to_string().into()
+    }
+}
+
+/// Returns information about prefligit's version.
+pub fn version() -> VersionInfo {
+    // Environment variables are only read at compile-time
+    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 = env!("CARGO_PKG_VERSION").to_string();
+
+    // Commit info is pulled from git and set by `build.rs`
+    let commit_info = option_env_str!("PREFLIGIT_COMMIT_HASH").map(|commit_hash| CommitInfo {
+        short_commit_hash: option_env_str!("PREFLIGIT_COMMIT_SHORT_HASH").unwrap(),
+        commit_hash,
+        commit_date: option_env_str!("PREFLIGIT_COMMIT_DATE").unwrap(),
+        last_tag: option_env_str!("PREFLIGIT_LAST_TAG"),
+        commits_since_last_tag: option_env_str!("PREFLIGIT_LAST_TAG_DISTANCE")
+            .as_deref()
+            .map_or(0, |value| value.parse::<u32>().unwrap_or(0)),
+    });
+
+    VersionInfo {
+        version,
+        commit_info,
+    }
+}