lpc55 0.1.0

Host-side tooling to interact with LPC55 chips via the ROM bootloader
Documentation 
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use std::env;
use std::fs;
use std::path;
use std::process;

#[cfg(feature = "cli")]
#[path = "src/bin/lpc55/cli.rs"]
mod cli;

fn main() {
    // OUT_DIR is set by Cargo and it's where any additional build artifacts
    // are written.
    let env_outdir = match env::var_os("OUT_DIR") {
        Some(outdir) => outdir,
        None => {
            eprintln!(
                "OUT_DIR environment variable not defined. \
                 Please file a bug: \
                 https://github.com/BurntSushi/ripgrep/issues/new"
            );
            process::exit(1);
        }
    };

    // empty file that is used in scripts/cargo-out-dir
    let stamp_path = path::Path::new(&env_outdir).join("lpc55-stamp");
    if let Err(err) = fs::File::create(&stamp_path) {
        panic!("failed to write {}: {}", stamp_path.display(), err);
    }

    // place side by side with binaries
    let outdir = path::PathBuf::from(path::PathBuf::from(env_outdir).ancestors().nth(3).unwrap());
    fs::create_dir_all(&outdir).unwrap();
    println!("{:?}", &outdir);

    #[cfg(feature = "cli")] {
        use clap_complete::{generate_to, shells};

        // Use clap to build completion files.
        // Pro-tip: use `fd -HIe bash` to get OUT_DIR
        let mut app = cli::app();
        generate_to(shells::Bash, &mut app, "lpc55", &outdir).unwrap();
        generate_to(shells::Fish, &mut app, "lpc55", &outdir).unwrap();
        generate_to(shells::PowerShell, &mut app, "lpc55", &outdir).unwrap();
        generate_to(shells::Zsh, &mut app, "lpc55", &outdir).unwrap();
    }

    // Make the current git hash available to the build.
    if let Some(rev) = git_revision_hash() {
        // this works, but it doesn't get picked up in app :/
        println!("cargo:rustc-env=LPC55_BUILD_GIT_HASH={}", rev);
    }
}

fn git_revision_hash() -> Option<String> {
    let result = process::Command::new("git")
        .args(&["rev-parse", "--short=10", "HEAD"])
        .output();
    result.ok().and_then(|output| {
        let v = String::from_utf8_lossy(&output.stdout).trim().to_string();
        if v.is_empty() {
            None
        } else {
            Some(v)
        }
    })
}