build.rs/src/cli.rs

use structopt::StructOpt;
use std::path::PathBuf;
use std::env;

#[derive(Debug, StructOpt)]
#[structopt(name = "git-build", about = "Update your repositories and trigger tasks")]
pub struct Cli {

    #[structopt(short = "f", long = "force")]
    pub force: bool,

    #[structopt(short = "b", long = "basedir")]
    pub basedir: Option<String>,

    //#[structopt(def)]
    pub tasks: Vec<String>,
}

impl Cli {
    pub fn basedir(&self) -> PathBuf {
        if let Some(basedir) = &self.basedir {
            PathBuf::from(basedir).canonicalize().expect("failed to expand relative path")
        } else {
            let mut home_path = PathBuf::from(env::var("HOME").expect("No $HOME in env"));
            home_path.push(".forgebuild");
            home_path
        }
    }
}