fix(tauri-build): preserve numeric semver build metadata in Windows FILEVERSION (tauri-apps#15289)

* fix(tauri-build): preserve numeric semver build metadata in Windows FILEVERSION

* refactor(tauri-build): clarify PRODUCTVERSION naming

* refactor(tauri-build): align fixed Windows version fields

* refactor(tauri-build): rename Windows version helper

* style(tauri-build): move winres helper near tests

Author: pascalandr

.changes/windows-fileversion-build-metadata.md

@@ -0,0 +1,5 @@
+---
+"tauri-build": "patch:enhance"
+---
+
+Preserve a numeric semver build identifier such as `1.2.3+42` in the 4th segment of the Windows `FILEVERSION` fixed field when it fits in the Windows version format.

crates/tauri-build/src/lib.rs

@@ -631,7 +631,7 @@ pub fn try_build(attributes: Attributes) -> Result<()> {
 
     if let Some(version_str) = &config.version {
       if let Ok(v) = Version::parse(version_str) {
-        let version = (v.major << 48) | (v.minor << 32) | (v.patch << 16);
+        let version = to_winres_version(&v);
         res.set_version_info(VersionInfo::FILEVERSION, version);
         res.set_version_info(VersionInfo::PRODUCTVERSION, version);
         res.set("FileVersion", version_str);
@@ -719,3 +719,54 @@ pub fn try_build(attributes: Attributes) -> Result<()> {
 
   Ok(())
 }
+
+fn to_winres_version(v: &semver::Version) -> u64 {
+  let build = v.build.parse::<u16>().map(u64::from).unwrap_or(0);
+
+  (v.major << 48) | (v.minor << 32) | (v.patch << 16) | build
+}
+
+#[cfg(test)]
+mod tests {
+  use semver::Version;
+
+  #[test]
+  fn version_uses_numeric_build_metadata() {
+    let version = Version::parse("1.2.3+42").unwrap();
+
+    assert_eq!(
+      crate::to_winres_version(&version),
+      (1 << 48) | (2 << 32) | (3 << 16) | 42
+    );
+  }
+
+  #[test]
+  fn version_ignores_non_numeric_composite_build_metadata() {
+    let version = Version::parse("1.2.3+42.sha").unwrap();
+
+    assert_eq!(
+      crate::to_winres_version(&version),
+      (1 << 48) | (2 << 32) | (3 << 16)
+    );
+  }
+
+  #[test]
+  fn version_ignores_non_numeric_build_metadata() {
+    let version = Version::parse("1.2.3+abc").unwrap();
+
+    assert_eq!(
+      crate::to_winres_version(&version),
+      (1 << 48) | (2 << 32) | (3 << 16)
+    );
+  }
+
+  #[test]
+  fn version_ignores_build_metadata_that_does_not_fit_in_u16() {
+    let version = Version::parse("1.2.3+70000").unwrap();
+
+    assert_eq!(
+      crate::to_winres_version(&version),
+      (1 << 48) | (2 << 32) | (3 << 16)
+    );
+  }
+}