Use vergen crate (#164)

Partially fixes #132

Author: trueleo

server/Cargo.toml

@@ -57,6 +57,7 @@ static-files = "0.2.1"
 cargo_toml = "0.11.5"
 ureq = "2.5.0"
 sha1_smol = { version = "1.0.0", features=["std"] }
+vergen = { version = "7.4.2", features = ["build", "git"] }
 zip = { git = "https://github.com/zip-rs/zip" }
 
 [dev-dependencies]

server/build.rs

@@ -16,7 +16,17 @@
  *
  */
 
+use vergen::{vergen, Config};
+
 fn main() {
+    // Init vergen
+    if let Err(e) = vergen(Config::default()) {
+        println!(
+            "cargo:warning=initializing vergen failed due to error: {}",
+            e
+        );
+    }
+
     println!("cargo:rerun-if-changed=build.rs");
     println!("cargo:rerun-if-changed=Cargo.toml");
     println!("cargo:rerun-if-env-changed=LOCAL_ASSETS_PATH");

server/src/banner.rs

@@ -92,8 +92,8 @@ pub mod version {
     }
 
     fn current_version() -> Version {
-        let current_version = env!("CARGO_PKG_VERSION");
-        semver::Version::parse(current_version).expect("CARGO_PKG_VERSION is always valid semver")
+        let current_version = env!("VERGEN_BUILD_SEMVER");
+        semver::Version::parse(current_version).expect("VERGEN_BUILD_SEMVER is always valid semver")
     }
 
     fn humanize_time(time_passed: Duration) -> String {