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use anyhow::{anyhow, Result};
use std::path::{Path, PathBuf};
const DEFAULT_MRUBY_VERSION: &'static str = "3.1.0";
pub struct MRubyManager {
workdir: Option<PathBuf>,
mruby_version: Option<String>,
do_link: bool,
build_config: Option<PathBuf>,
do_download: bool,
}
impl MRubyManager {
pub fn new() -> Self {
Self {
workdir: None,
mruby_version: None,
do_link: true,
build_config: None,
do_download: true,
}
}
pub fn workdir(mut self, path: &Path) -> Self {
self.workdir = Some(path.to_path_buf());
self
}
pub fn mruby_version(mut self, mruby_version: &str) -> Self {
self.mruby_version = Some(mruby_version.to_string());
self
}
pub fn build_config(mut self, build_config: &Path) -> Self {
self.build_config = Some(build_config.to_path_buf());
self
}
pub fn link(mut self, doit: bool) -> Self {
self.do_link = doit;
self
}
pub fn download(mut self, doit: bool) -> Self {
self.do_download = doit;
self
}
pub fn run(self) {
let workdir = self.workdir.unwrap_or_else(|| {
let out_dir = std::env::var("OUT_DIR")
.expect("Could not fetch \"OUT_DIR\" environment variable.");
Path::new(&out_dir).to_path_buf()
});
let mruby_version = self
.mruby_version
.map(String::from)
.unwrap_or(DEFAULT_MRUBY_VERSION.to_string());
let build_config = self
.build_config
.unwrap_or(Path::new("default").to_path_buf());
if self.do_download {
download_mruby(&workdir, &mruby_version);
}
build_mruby(&workdir, &build_config);
if self.do_link {
link_mruby(&workdir);
}
}
}
fn build_mruby(workdir: &Path, path: &Path) {
let c = &[
"rake",
"all",
&format!("MRUBY_CONFIG={}", path.to_string_lossy()),
];
run_command(&workdir.join("mruby"), c).unwrap();
}
fn link_mruby(workdir: &Path) {
let mruby_config = workdir.join("mruby").join("bin").join("mruby-config");
let ldflags_before_libs = run_command(
workdir,
&[mruby_config.to_str().unwrap(), "--ldflags-before-libs"],
)
.unwrap();
let ldflags = run_command(workdir, &[mruby_config.to_str().unwrap(), "--ldflags"]).unwrap();
let libs = run_command(workdir, &[mruby_config.to_str().unwrap(), "--libs"]).unwrap();
println!(
"cargo:rustc-flags={} {} {}",
ldflags_before_libs.trim(),
ldflags.trim(),
libs.trim()
);
if cc::Build::new()
.is_flag_supported("-Wl,--no-as-needed")
.unwrap()
{
println!("cargo:rustc-link-arg=-Wl,--no-as-needed");
println!("cargo:rustc-link-arg=-lmruby");
}
}
pub fn download_mruby(workdir: &Path, mruby_version: &str) {
if workdir.join("mruby").exists() {
return;
}
let url = if mruby_version == "master" {
String::from("https://github.com/mruby/mruby/archive/refs/heads/master.tar.gz")
} else {
format!(
"https://github.com/mruby/mruby/archive/refs/tags/{}.tar.gz",
mruby_version
)
};
let resp = reqwest::blocking::get(url).unwrap();
let tar_gz = resp.bytes().unwrap();
let tar = {
use bytes::Buf;
flate2::read::GzDecoder::new(tar_gz.reader())
};
let mut archive = tar::Archive::new(tar);
archive.unpack(&workdir).unwrap();
std::fs::rename(
workdir.join(format!("mruby-{}", mruby_version)),
workdir.join("mruby"),
)
.unwrap();
}
fn run_command(current_dir: &Path, cmd: &[&str]) -> Result<String> {
println!("Start: {:?}", cmd);
let output = std::process::Command::new(cmd[0])
.args(&cmd[1..])
.current_dir(current_dir)
.output()?;
if output.status.success() {
Ok(String::from_utf8_lossy(&output.stdout).to_string())
} else {
Err(anyhow!(format!("Executing {:?} failed", cmd)))
}
}