fix: build.rs not running on git changes

1 files changed, 37 insertions, 0 deletions

diff --git a/build.rs b/build.rs
index 5b868a4..d1a02af 100644
--- a/build.rs
+++ b/build.rs
@@ -1,3 +1,7 @@
+// (c) 2023 Cory Forsstrom
+// (c) 2024-2025 Polesznyák Márk László
+
+use std::path::Path;
 use std::process::Command;
 
 fn main() {
@@ -12,6 +16,39 @@ fn main() {
         println!("cargo:rustc-env=GIT_HASH={}", hash);
     }
 
+    if git_hash.is_none() {
+        return;
+    }
+
+    let Some(git_dir): Option<String> = Command::new("git")
+        .args(["rev-parse", "--git-dir"])
+        .output()
+        .ok()
+        .filter(|output| output.status.success())
+        .and_then(|x| String::from_utf8(x.stdout).ok())
+    else {
+        return;
+    };
+
+    let head = Path::new(&git_dir).join("HEAD");
+    if head.exists() {
+        println!("cargo:rerun-if-changed={}", head.display());
+    }
+
+    let Some(head_ref): Option<String> = Command::new("git")
+        .args(["symbolic-ref", "HEAD"])
+        .output()
+        .ok()
+        .filter(|output| output.status.success())
+        .and_then(|x| String::from_utf8(x.stdout).ok())
+    else {
+        return;
+    };
+    let head_ref = Path::new(&git_dir).join(head_ref);
+    if head_ref.exists() {
+        println!("cargo:rerun-if-changed={}", head_ref.display());
+    }
+
     println!("cargo::rerun-if-changed=fonts/icons.toml");
     iced_fontello::build("fonts/icons.toml").expect("Build icons font");
     #[cfg(windows)]