About: include git tag in about message

crates/findex/build.rs

@@ -0,0 +1,18 @@
+use std::process::Command;
+
+fn main() {
+    let git_commit = match Command::new("git")
+        .args(&["describe", "--tags"])
+        .output() {
+        Ok(output) => {
+            if output.status.success() {
+                String::from_utf8_lossy(&output.stdout).to_string()
+            } else {
+                String::from("[git was unavailable in build time]")
+            }
+        },
+        Err(_) => String::from("[git was unavailable in build time]"),
+    };
+
+    println!("cargo:rustc-env=GIT_COMMIT={git_commit}");
+}

crates/findex/src/main.rs

@@ -14,7 +14,7 @@ static FINDEX_VERSION: &str = env!("CARGO_PKG_VERSION");
 
 fn main() {
     if std::env::args().any(|arg| arg == "--about") {
-        println!("Findex v{FINDEX_VERSION}");
+        println!("Findex v{FINDEX_VERSION} from {}", env!("GIT_COMMIT"));
         println!("Author: MD Gaziur Rahman Noor <mdgaziurrahmannoor@gmail.com>");
         println!("License: GPL3");
         println!("Report issues at: https://github.com/mdgaziur/findex/issues");