build.rs

extern crate git2;
extern crate syntex;
extern crate serde_codegen;

use std::env;
use std::fs::File;
use std::io::Write;
use std::path::Path;
use git2::{Repository, DescribeOptions};

fn gen_version() {
    let out_dir = env::var("OUT_DIR").unwrap();
    let dest_path = Path::new(&out_dir).join("version.rs");
    let mut f = File::create(&dest_path).unwrap();
    f.write_all(b"pub const VERSION: &'static str = \"").unwrap();
    match Repository::open(Path::new(".")) {
        Ok(repo) => {
            let describe = repo.describe(DescribeOptions::new().show_commit_oid_as_fallback(true)).unwrap();
            f.write_all(describe.format(None).unwrap().trim_left_matches("limonite-").as_bytes()).unwrap();
        },
        Err(_) => {
            f.write_all(env!("CARGO_PKG_VERSION").as_bytes()).unwrap();
        }
    };
    f.write_all(b"\";").unwrap();
}

fn process_serde_macros(input: &str, out: &str) {
    let out_dir = env::var_os("OUT_DIR").unwrap();

    let src = Path::new(input);
    let dst = Path::new(&out_dir).join(out);

    let mut registry = syntex::Registry::new();

    serde_codegen::register(&mut registry);
    registry.expand("", &src, &dst).unwrap();
}

fn main() {
    gen_version();
    process_serde_macros("src/post.rs.in", "post.rs");
    process_serde_macros("src/site.rs.in", "site.rs");
}