add proper version string

Cargo.lock

@@ -182,7 +182,7 @@ checksum = "9b7820b9daea5457c9f21c69448905d723fbd21136ccf521748f23fd49e723ee"
 
 [[package]]
 name = "pacdef"
-version = "0.1.0"
+version = "1.0.0-alpha1"
 dependencies = [
  "alpm",
  "anyhow",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "pacdef"
-version = "0.1.0"
+version = "1.0.0-alpha1"
 edition = "2021"
 
 [dependencies]

build.rs

@@ -0,0 +1,10 @@
+use std::process::Command;
+
+fn main() {
+    let output = Command::new("git")
+        .args(["rev-parse", "--short", "HEAD"])
+        .output()
+        .unwrap();
+    let git_hash = String::from_utf8(output.stdout).unwrap();
+    println!("cargo:rustc-env=GIT_HASH={git_hash}");
+}

src/args.rs

@@ -4,11 +4,12 @@ use clap::{Arg, ArgMatches, Command};
 use path_absolutize::Absolutize;
 
 use crate::action::*;
+use crate::core::get_version_string;
 
 fn get_arg_parser() -> Command {
     Command::new("pacdef")
         .about("declarative package manager for Arch Linux")
-        .version("1.0.0-alpha")
+        .version(get_version_string())
         .subcommand_required(true)
         .arg_required_else_help(true)
         .subcommand(Command::new(CLEAN).about("remove unmanaged packages"))

src/core.rs

@@ -136,7 +136,7 @@ impl Pacdef {
     }
 
     fn show_version(self) {
-        println!("pacdef, version: {}", env!("CARGO_PKG_VERSION"));
+        println!("{}", get_version_string());
     }
 
     fn show_unmanaged_packages(mut self) {
@@ -289,3 +289,13 @@ fn show_error(error: anyhow::Error, backend: Box<dyn Backend>) {
         None => println!("WARNING: skipping backend '{section}': {error}"),
     }
 }
+
+pub(crate) const fn get_version_string() -> &'static str {
+    concat!(
+        "pacdef, version: ",
+        env!("CARGO_PKG_VERSION"),
+        " (",
+        env!("GIT_HASH"),
+        ")",
+    )
+}