sed 0.1.1

sed ~ implemented as universal (cross-platform) utils, written in Rust
Documentation 
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// This file is part of the uutils sed package.
//
// For the full copyright and license information, please view the LICENSE
// file that was distributed with this source code.

// spell-checker:ignore (vars) krate

use std::env;
use std::fs::File;
use std::io::Write;
use std::path::Path;

pub fn main() {
    const ENV_FEATURE_PREFIX: &str = "CARGO_FEATURE_";
    const FEATURE_PREFIX: &str = "feat_";

    if let Ok(profile) = env::var("PROFILE") {
        println!("cargo:rustc-cfg=build={profile:?}");
    }

    let out_dir = env::var("OUT_DIR").unwrap();

    let mut crates = Vec::new();
    for (key, val) in env::vars() {
        if val == "1" && key.starts_with(ENV_FEATURE_PREFIX) {
            let krate = key[ENV_FEATURE_PREFIX.len()..].to_lowercase();
            // Allow this as we have a bunch of info in the comments
            #[allow(clippy::match_same_arms)]
            match krate.as_ref() {
                "default" | "macos" | "unix" | "windows" | "selinux" | "zip" => continue, // common/standard feature names
                "nightly" | "test_unimplemented" => continue, // crate-local custom features
                "test" => continue, // over-ridden with 'uu_test' to avoid collision with rust core crate 'test'
                s if s.starts_with(FEATURE_PREFIX) => continue, // crate feature sets
                _ => {}             // util feature name
            }
            crates.push(krate);
        }
    }
    crates.sort();

    let mut mf = File::create(Path::new(&out_dir).join("uutils_map.rs")).unwrap();

    mf.write_all(
        "type UtilityMap<T> = phf::OrderedMap<&'static str, (fn(T) -> i32, fn() -> Command)>;\n\
         \n\
         #[allow(clippy::too_many_lines)]
         fn util_map<T: uucore::Args>() -> UtilityMap<T> {\n"
            .as_bytes(),
    )
    .unwrap();

    let mut phf_map = phf_codegen::OrderedMap::<&str>::new();
    let crate_name = env::var("CARGO_PKG_NAME").unwrap();
    for krate in &crates {
        // Use the package name to reference modules in the main crate from binaries
        let map_value = format!("({crate_name}::{krate}::uumain, {crate_name}::{krate}::uu_app)");
        phf_map.entry(krate, map_value);
    }
    write!(mf, "{}", phf_map.build()).unwrap();
    mf.write_all(b"\n}\n").unwrap();

    mf.flush().unwrap();
}