//
// Copyright (c) {{ "today" | date: "%Y" }}  murilo ijanc' <murilo@ijanc.org>
//
// Permission to use, copy, modify, and distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
//

fn main() {
    println!("cargo:rerun-if-changed=.git/HEAD");
    println!("cargo:rerun-if-changed=.git/refs/heads");

    let git_hash = git_cmd(&["rev-parse", "--short=6", "HEAD"]);

    let git_date =
        git_cmd(&["show", "-s", "--format=%cd", "--date=short", "HEAD"]);

    println!("cargo:rustc-env=GIT_HASH={}", git_hash);
    println!("cargo:rustc-env=BUILD_DATE={}", git_date);
}

fn git_cmd(args: &[&str]) -> String {
    use std::process::Command;

    Command::new("git")
        .args(args)
        .output()
        .ok()
        .filter(|output| output.status.success())
        .and_then(|output| String::from_utf8(output.stdout).ok())
        .map(|s| s.to_string())
        .filter(|s| !s.is_empty())
        .unwrap_or_else(|| "unknown".to_string())
}