From 807d34b66b6e7407fac8e3b83eb2e97edd1931cc Mon Sep 17 00:00:00 2001
From: "Hatter Jiang@Pixelbook" <jht5945@gmail.com>
Date: Fri, 2 Aug 2019 01:23:55 +0800
Subject: [PATCH] add git hash

---
 build.rs    | 7 +++++++
 src/main.rs | 5 +++--
 2 files changed, 10 insertions(+), 2 deletions(-)
 create mode 100644 build.rs

diff --git a/build.rs b/build.rs
new file mode 100644
index 0000000..63ac78b
--- /dev/null
+++ b/build.rs
@@ -0,0 +1,7 @@
+use std::process::Command;
+fn main() {
+    // note: add error checking yourself.
+    let output = Command::new("git").args(&["rev-parse", "HEAD"]).output().unwrap();
+    let git_hash = String::from_utf8(output.stdout).unwrap();
+    println!("cargo:rustc-env=GIT_HASH={}", git_hash);
+}
diff --git a/src/main.rs b/src/main.rs
index 4ac3812..d1abeba 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -14,14 +14,15 @@ use argparse::{ArgumentParser, StoreTrue, Store};
 use rust_util::*;
 
 const VERSION: &str = env!("CARGO_PKG_VERSION");
+const GIT_HASH: &str = env!("GIT_HASH");
 
 fn print_version() {
-    print!(r#"prettyjson {}
+    print!(r#"prettyjson {} - {}
 Copyright (C) 2019 Hatter Jiang.
 License MIT <https://opensource.org/licenses/MIT>
 
 Written by Hatter Jiang
-"#, VERSION);
+"#, VERSION, &GIT_HASH[0..7]);
 }
 
 fn read_to_string(read: &mut Read) -> XResult<String> {