Use short SHA in start message

build.rs

@@ -1,8 +1,10 @@
 use std::error::Error;
 
-use vergen::{vergen, Config};
+use vergen::{vergen, Config, ShaKind};
 
 fn main() -> Result<(), Box<dyn Error>> {
-    vergen(Config::default())?;
+    let mut config = Config::default();
+    *config.git_mut().sha_kind_mut() = ShaKind::Short;
+    vergen(config)?;
     Ok(())
 }

src/main.rs

@@ -244,8 +244,8 @@ fn print_preamble_and_warnings(args: &CliArgs) -> Result<(), Box<dyn Error>> {
         " ",
         env!("CARGO_PKG_VERSION"),
         " (",
-        env!("VERGEN_GIT_SHA"),
-        ") ",
+        env!("VERGEN_GIT_SHA_SHORT"),
+        ")",
         "  Copyright (C) 2021  ",
         env!("CARGO_PKG_AUTHORS"),
         "\n\n",