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mod deps;
use std::env;
use std::path::PathBuf;
use std::process::Command;
use std::process::Stdio;
pub fn out_dir() -> PathBuf {
let out_dir = env::var("OUT_DIR").unwrap();
PathBuf::from(out_dir)
.parent()
.unwrap()
.parent()
.unwrap()
.parent()
.unwrap()
.to_owned()
}
pub fn is_debug() -> bool {
let m = env::var("PROFILE").unwrap();
if m == "release" {
false
} else if m == "debug" {
true
} else {
panic!("unhandled PROFILE value {}", m)
}
}
fn gn() -> String {
env::var("GN").unwrap_or_else(|_| "gn".to_owned())
}
fn ninja() -> String {
env::var("NINJA").unwrap_or_else(|_| "ninja".to_owned())
}
pub type GnArgs = Vec<String>;
pub fn maybe_gen(root: &str, gn_args: GnArgs) -> PathBuf {
let gn_out_dir = out_dir().join("gn_out");
if !gn_out_dir.exists() {
let args = gn_args.join(" ");
let path = env::current_dir().unwrap();
println!("The current directory is {}", path.display());
println!("gn gen --root={} {}", root, gn_out_dir.display());
let mut cmd = Command::new(gn());
cmd.arg(format!("--root={}", root));
cmd.arg("gen");
cmd.arg(&gn_out_dir);
cmd.arg("--args=".to_owned() + &args);
cmd.stdout(Stdio::inherit());
cmd.stderr(Stdio::inherit());
cmd.envs(env::vars());
run(&mut cmd, "gn gen");
}
gn_out_dir
}
pub fn build(target: &str) {
let gn_out_dir = out_dir().join("gn_out");
println!("cargo:rustc-env=GN_OUT_DIR={}", gn_out_dir.display());
let mut cmd = Command::new(ninja());
cmd.arg("-C");
cmd.arg(&gn_out_dir);
cmd.arg(target);
run(&mut cmd, "ninja");
rerun_if_changed(&gn_out_dir, target);
println!(
"cargo:rustc-link-search=native={}/obj/",
gn_out_dir.display()
);
}
fn rerun_if_changed(out_dir: &PathBuf, target: &str) {
let deps = deps::ninja_get_deps(&ninja(), out_dir, target);
for d in deps {
let p = out_dir.join(d);
assert!(p.exists());
println!("cargo:rerun-if-changed={}", p.display());
}
}
fn run(cmd: &mut Command, program: &str) {
use std::io::ErrorKind;
println!("running: {:?}", cmd);
let status = match cmd.status() {
Ok(status) => status,
Err(ref e) if e.kind() == ErrorKind::NotFound => {
fail(&format!(
"failed to execute command: {}\nis `{}` not installed?",
e, program
));
}
Err(e) => fail(&format!("failed to execute command: {}", e)),
};
if !status.success() {
fail(&format!(
"command did not execute successfully, got: {}",
status
));
}
}
fn fail(s: &str) -> ! {
panic!("\n{}\n\nbuild script failed, must exit now", s)
}