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//! ## Build Example
//!
//! ```text
//! .
//! ├── build.rs
//! ├── Cargo.toml
//! ├── clib
//! │   ├── meson.build
//! │   ├── squid.h
//! │   └── squid.c
//! └── src
//!     └── lib.rs
//! ```
//!
//! build.rs:
//!
//! ```
//! extern crate meson;
//! use std::env;
//! use std::path::PathBuf;
//!
//! fn main() {
//!     let build_path = PathBuf::from(env::var("OUT_DIR").unwrap());
//!     build_path.join("build");
//!     let build_path = build_path.to_str().unwrap();
//!
//!     println!("cargo:rustc-link-lib=squid");
//!     println!("cargo:rustc-link-search=native={}", build_path);
//!     meson::build("clib", build_path);
//! }
//! ```
//!
//! Cargo.toml:
//!
//! ```toml
//! # ...
//!
//! [build-dependencies]
//! meson = "1.0.0"
//! ```
//!
//! meson.build:
//!
//! ```text
//! project('squid', 'c')
//! shared_library('squid', 'squid.c')
//! ```


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

/// Runs meson and/or ninja to build a project.
pub fn build(project_dir: &str, build_dir: &str) {
    run_meson(project_dir, build_dir);
}

fn run_meson(lib: &str, dir: &str) {
    if !is_configured(dir) {
        run_command(lib, "meson", &[".", dir]);
    }
    run_command(dir, "ninja", &[]);
}

fn run_command(dir: &str, name: &str, args: &[&str]) {
    let mut cmd = Command::new(name);
    cmd.current_dir(dir);
    if args.len() > 0 {
        cmd.args(args);
    }
    let status = cmd.status().expect("cannot run command");
    assert!(status.success());
}

fn is_configured(dir: &str) -> bool {
    let mut path = PathBuf::from(dir);
    path.push("build.ninja");
    return path.as_path().exists();
}