Find `msbuild` using `vswhere`

find_msbuild.rs

use std::path::PathBuf;
use std::process::Command;
use std::str;

let mut msbuild = PathBuf::from("msbuild");

let check_msbuild = Command::new(msbuild)
    .arg("--version")
    .output()
    .is_ok();

if !check_msbuild {
    let vswhere = {
        let mut path = PathBuf::from(std::env::var("ProgramFiles(x86)").expect("failed to find `vswhere`"));
        path.push("Microsoft Visual Studio");
        path.push("Installer");
        path.push("vswhere.exe");
        path
    };

    let msbuild_paths = Command::new(vswhere)
        .args(&[
            "-latest",
            "-requires",
            "Microsoft.Component.MSBuild",
            "-find",
            "MSBuild\\**\\Bin\\MSBuild.exe"
        ] as &[_])
        .output()
        .expect("failed to run vswhere");

    let found_msbuild_path = str::from_utf8(&msbuild_paths.stdout)
        .expect("invalid vswhere output")
        .lines()
        .next()
        .expect("no vswhere output");

    msbuild = PathBuf::from(found_msbuild_path);
} else {
    panic!("on the path!");
}