use chrono::prelude::*;

const README_TEMPLATE: &str = include_str!("../doc/README.tera.md");
const CLI_MENU: &str = include_str!("../doc/cli-menu.txt");
const JUST_COMMANDS: &str = include_str!("../doc/just-commands.txt");
const CONFIG_SAMPLE: &str = include_str!("../config.toml.sample");

fn get_commit_ref() -> Result<String, Box<dyn std::error::Error>> {
    let output = std::process::Command::new("git")
        .args(&["rev-parse", "HEAD"][..])
        .output()?
        .stdout;

    let commit = std::str::from_utf8(&output[..8]).map(|x| x.to_string())?;

    Ok(commit)
}

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let mut tera = tera::Tera::default();
    tera.add_raw_template("README.md", README_TEMPLATE).unwrap();
    let mut ctx = tera::Context::new();
    ctx.insert("cli_menu", CLI_MENU);
    ctx.insert("config_sample", CONFIG_SAMPLE);
    ctx.insert("just_commands", JUST_COMMANDS);
    ctx.insert("git_commit", &get_commit_ref()?);
    ctx.insert("generation_time", &Utc::now().to_rfc2822());
    let readme = tera.render("README.md", &ctx)?;
    println!("{}", readme);
    Ok(())
}