Move git commands to function

1 files changed, 34 insertions, 13 deletions

diff --git a/build.rs b/build.rs
index 8174a53..6efb53f 100644
--- a/build.rs
+++ b/build.rs
@@ -1,21 +1,42 @@
-use std::process::Command;
+//
+// Copyright (c) 2025 murilo ijanc' <murilo@ijanc.org>
+//
+// Permission to use, copy, modify, and distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+//
 
 fn main() {
-    let git_hash = Command::new("git")
-        .args(["rev-parse", "--short=6", "HEAD"])
-        .output()
-        .map(|out| String::from_utf8_lossy(&out.stdout).trim().to_string())
-        .unwrap_or_else(|_| "unknown".into());
+    println!("cargo:rerun-if-changed=.git/HEAD");
+    println!("cargo:rerun-if-changed=.git/refs/heads");
 
-    let git_date = Command::new("git")
-        .args(["show", "-s", "--format=%cd", "--date=short", "HEAD"])
-        .output()
-        .map(|out| String::from_utf8_lossy(&out.stdout).trim().to_string())
-        .unwrap_or_else(|_| "unknown".into());
+    let git_hash = git_cmd(&["rev-parse", "--short=6", "HEAD"]);
+
+    let git_date =
+        git_cmd(&["show", "-s", "--format=%cd", "--date=short", "HEAD"]);
 
     println!("cargo:rustc-env=GIT_HASH={}", git_hash);
     println!("cargo:rustc-env=BUILD_DATE={}", git_date);
+}
 
-    println!("cargo:rerun-if-changed=.git/HEAD");
-    println!("cargo:rerun-if-changed=.git/refs/heads");
+fn git_cmd(args: &[&str]) -> String {
+    use std::process::Command;
+
+    Command::new("git")
+        .args(args)
+        .output()
+        .ok()
+        .filter(|output| output.status.success())
+        .and_then(|output| String::from_utf8(output.stdout).ok())
+        .map(|s| s.to_string())
+        .filter(|s| !s.is_empty())
+        .unwrap_or_else(|| "unknown".to_string())
 }