vergen

Includes 3 functions for use in version strings in lib.rs/main.rs at compile time via a custom cargo build script.

Note: This currently only works for projects using git building on Linux or msys2. I haven't tested on Mac OS/X, but it will work if the date command exists. I plan to expand the functionality to additional platforms eventually.

pub fn now() -> &'static str {
   // Output of 'date --rc-3339=ns'
}

pub fn sha() -> &'static str {
   // Output of 'git rev-parse HEAD'
}

pub fn semver() -> &'static str {
   // output of 'git describe'
   // this works best if you tag your releases 'vX.X.X'
   // and create a new tag on master after a release 'vX.X.Y-pre'
}

Status

Basic Usage

Cargo.toml

[package]
#
build = "build.rs"
#
[build-dependencies]
vergen = "*"

build.rs

use vergen::vergen;

fn main() {
    vergen();
}

lib.rs/main.rs

include!(concat!(env!("OUT_DIR"), "/version.rs"));

// The following is an exmaple.  You could use now(), sha(), and semver() however you want.
fn version() -> String {
    format!("{} {} {}", now(), sha(), semver())
    // 2015-02-11 15:35:30.991638113-05:00 b8acdc17bbf0d9928f08b15cba6d3b659770a624 rh v0.0.1-pre-21-gb8acdc1
}