print git commit hash and commit date in version output

clippy 0.0.212 (964fcbe0 2018-09-06)

Author: matthiaskrgr

.gitignore

@@ -19,6 +19,7 @@ Cargo.lock
 /target
 /clippy_lints/target
 /clippy_workspace_tests/target
+/rustc_tools_util/target
 
 # Generated by dogfood
 /target_recur/

Cargo.toml

@@ -44,6 +44,7 @@ clippy_lints = { version = "0.0.212", path = "clippy_lints" }
 # end automatic update
 regex = "1"
 semver = "0.9"
+rustc_tools_util = { version = "0.1.0", path = "rustc_tools_util"}
 
 [dev-dependencies]
 cargo_metadata = "0.6"

build.rs

@@ -1,8 +1,37 @@
 use std::env;
+use std::process::Command;
 
 fn main() {
     // Forward the profile to the main compilation
     println!("cargo:rustc-env=PROFILE={}", env::var("PROFILE").unwrap());
     // Don't rebuild even if nothing changed
     println!("cargo:rerun-if-changed=build.rs");
+    // forward git repo hashes we build at
+    println!("cargo:rustc-env=GIT_HASH={}", get_commit_hash());
+    println!("cargo:rustc-env=COMMIT_DATE={}", get_commit_date());
+}
+
+pub fn get_commit_hash() -> String {
+    let commit = Command::new("git")
+        .args(&["rev-parse", "--short", "HEAD"])
+        .output()
+        .ok()
+        .and_then(|r| String::from_utf8(r.stdout).ok());
+
+    match commit {
+        Some(commit) => commit,
+        None => String::new(),
+    }
+}
+
+pub fn get_commit_date() -> String {
+    let date = Command::new("git")
+        .args(&["log", "-1", "--date=short", "--pretty=format:%cd"])
+        .output()
+        .ok()
+        .and_then(|r| String::from_utf8(r.stdout).ok());
+    match date {
+        Some(date) => date,
+        None => String::new(),
+    }
 }

rustc_tools_util/Cargo.toml

@@ -0,0 +1,9 @@
+cargo-features = ["edition"]
+
+[package]
+name = "rustc_tools_util"
+version = "0.1.0"
+authors = ["Matthias Krüger <[email protected]>"]
+build = "build.rs"
+edition = "2018"
+[dependencies]

rustc_tools_util/build.rs

@@ -0,0 +1,37 @@
+use std::env;
+use std::process::Command;
+
+fn main() {
+    // Forward the profile to the main compilation
+    println!("cargo:rustc-env=PROFILE={}", env::var("PROFILE").unwrap());
+    // Don't rebuild even if nothing changed
+    println!("cargo:rerun-if-changed=build.rs");
+    // forward git repo hashes we build at
+    println!("cargo:rustc-env=GIT_HASH={}", get_commit_hash());
+    println!("cargo:rustc-env=COMMIT_DATE={}", get_commit_date());
+}
+
+pub fn get_commit_hash() -> String {
+    let commit = Command::new("git")
+        .args(&["rev-parse", "--short", "HEAD"])
+        .output()
+        .ok()
+        .and_then(|r| String::from_utf8(r.stdout).ok());
+
+    match commit {
+        Some(commit) => commit,
+        None => String::new(),
+    }
+}
+
+pub fn get_commit_date() -> String {
+    let date = Command::new("git")
+        .args(&["log", "-1", "--date=short", "--pretty=format:%cd"])
+        .output()
+        .ok()
+        .and_then(|r| String::from_utf8(r.stdout).ok());
+    match date {
+        Some(date) => date,
+        None => String::new(),
+    }
+}

rustc_tools_util/src/lib.rs

@@ -0,0 +1,80 @@
+#![feature(tool_lints)]
+
+use std::env;
+
+#[allow(clippy::useless_let_if_seq)]
+#[macro_export]
+macro_rules! get_VersionInfo {
+    () => {{
+        let major = env!("CARGO_PKG_VERSION_MAJOR").parse::<u8>().unwrap();
+        let minor = env!("CARGO_PKG_VERSION_MINOR").parse::<u8>().unwrap();
+        let patch = env!("CARGO_PKG_VERSION_PATCH").parse::<u16>().unwrap();
+
+        let host_compiler = $crate::get_channel();
+        let commit_hash = option_env!("GIT_HASH").map(|s| s.to_string());
+        let commit_date = option_env!("COMMIT_DATE").map(|s| s.to_string());
+
+        VersionInfo {
+            major,
+            minor,
+            patch,
+            host_compiler,
+            commit_hash,
+            commit_date,
+        }
+    }};
+}
+
+// some code taken and adapted from RLS and cargo
+pub struct VersionInfo {
+    pub major: u8,
+    pub minor: u8,
+    pub patch: u16,
+    pub host_compiler: Option<String>,
+    pub commit_hash: Option<String>,
+    pub commit_date: Option<String>,
+}
+
+// https://internals.rust-lang.org/t/macro-trait-implementation/5492
+impl VersionInfo {
+    pub fn new() -> VersionInfo {
+        get_VersionInfo!()
+    }
+}
+
+impl Default for VersionInfo {
+    fn default() -> Self {
+        VersionInfo::new()
+    }
+}
+
+impl std::fmt::Display for VersionInfo {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        match self.commit_hash {
+            Some(_) => {
+                write!(
+                    f,
+                    "clippy {}.{}.{} ({} {})",
+                    self.major,
+                    self.minor,
+                    self.patch,
+                    self.commit_hash.clone().unwrap_or_default().trim(),
+                    self.commit_date.clone().unwrap_or_default().trim(),
+                )?;
+            },
+            None => {
+                write!(f, "clippy {}.{}.{}", self.major, self.minor, self.patch)?;
+            },
+        };
+        Ok(())
+    }
+}
+
+pub fn get_channel() -> Option<String> {
+    if let Ok(channel) = env::var("CFG_RELEASE_CHANNEL") {
+        Some(channel)
+    } else {
+        // we could ask ${RUSTC} -Vv and do some parsing and find out
+        Some(String::from("nightly"))
+    }
+}

src/main.rs

@@ -4,6 +4,8 @@
 #![feature(tool_lints)]
 #![allow(unknown_lints, clippy::missing_docs_in_private_items)]
 
+use rustc_tools_util::*;
+
 const CARGO_CLIPPY_HELP: &str = r#"Checks a package to catch common mistakes and improve your Rust code.
 
 Usage:
@@ -35,8 +37,11 @@ fn show_help() {
 }
 
 #[allow(clippy::print_stdout)]
+#[allow(clippy::useless_let_if_seq)]
+
 fn show_version() {
-    println!(env!("CARGO_PKG_VERSION"));
+    let version_info = rustc_tools_util::get_VersionInfo!();
+    println!("{}", version_info);
 }
 
 pub fn main() {
@@ -45,6 +50,7 @@ pub fn main() {
         show_help();
         return;
     }
+
     if std::env::args().any(|a| a == "--version" || a == "-V") {
         show_version();
         return;
@@ -94,8 +100,7 @@ where
                         .into_os_string()
                 },
             )
-        })
-        .map(|p| ("CARGO_TARGET_DIR", p));
+        }).map(|p| ("CARGO_TARGET_DIR", p));
 
     let exit_status = std::process::Command::new("cargo")
         .args(&args)