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// Copyright 2018 the Deno authors. All rights reserved. MIT license.
// Run "cargo build -vv" if you want to see gn output.
#![deny(warnings)]
use std::env;use std::path::{self, Path, PathBuf};use std::process::Command;
fn main() {  // Cargo sets PROFILE to either "debug" or "release", which conveniently  // matches the build modes we support.  let mode = env::var("PROFILE").unwrap();
  // Normally we configure GN+Ninja to build into Cargo's OUT_DIR.  // However, when DENO_BUILD_PATH is set, perform the ninja build in that dir  // instead. This is used by CI to avoid building V8 etc twice.  let out_dir = env::var_os("OUT_DIR").unwrap();  let gn_out_dir = match env::var_os("DENO_BUILD_PATH") {    None => abs_path(out_dir),    Some(deno_build_path) => abs_path(deno_build_path),  };
  // Give cargo some instructions. We do this first so the `rerun-if-*-changed`  // directives can take effect even if something the build itself fails.  println!("cargo:rustc-env=GN_OUT_DIR={}", gn_out_dir);  println!("cargo:rustc-link-search=native={}/obj", gn_out_dir);  println!("cargo:rustc-link-lib=static=deno_deps");
  println!("cargo:rerun-if-changed={}", abs_path("src/msg.fbs"));  println!("cargo:rerun-if-env-changed=DENO_BUILD_PATH");  // TODO: this is obviously not appropriate here.  println!("cargo:rerun-if-env-changed=APPVEYOR_REPO_COMMIT");
  // Detect if we're being invoked by the rust language server (RLS).  // Unfortunately we can't detect whether we're being run by `cargo check`.  let check_only = env::var_os("CARGO")    .map(PathBuf::from)    .as_ref()    .and_then(|p| p.file_stem())    .and_then(|f| f.to_str())    .map(|s| s.starts_with("rls"))    .unwrap_or(false);
  // If we're being invoked by the RLS, build only the targets that are needed  // for `cargo check` to succeed.  let gn_target = if check_only {    "cargo_check_deps"  } else {    "deno_deps"  };
  let status = Command::new("python")    .env("DENO_BUILD_PATH", &gn_out_dir)    .env("DENO_BUILD_MODE", &mode)    .arg("./tools/setup.py")    .status()    .expect("setup.py failed");  assert!(status.success());
  let status = Command::new("python")    .env("DENO_BUILD_PATH", &gn_out_dir)    .env("DENO_BUILD_MODE", &mode)    .arg("./tools/build.py")    .arg(gn_target)    .arg("-v")    .status()    .expect("build.py failed");  assert!(status.success());}
// Utility function to make a path absolute, normalizing it to use forward// slashes only. The returned value is an owned String, otherwise panics.fn abs_path<P: AsRef<Path>>(path: P) -> String {  env::current_dir()    .unwrap()    .join(path)    .to_str()    .unwrap()    .to_owned()    .chars()    .map(|c| if path::is_separator(c) { '/' } else { c })    .collect()}