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use std::env;
use std::ffi::OsString;
use std::fs::File;
use std::io::{BufRead, BufReader, Result};
use std::ops::Bound;
use std::path::{Path, PathBuf};
pub fn probe_lua() -> PathBuf {
let include_dir = env::var_os("LUA_INC").unwrap_or(OsString::new());
let lib_dir = env::var_os("LUA_LIB").unwrap_or(OsString::new());
let lua_lib = env::var_os("LUA_LIB_NAME").unwrap_or(OsString::new());
println!("cargo:rerun-if-env-changed=LUA_INC");
println!("cargo:rerun-if-env-changed=LUA_LIB");
println!("cargo:rerun-if-env-changed=LUA_LIB_NAME");
println!("cargo:rerun-if-env-changed=LUA_LINK");
if include_dir != "" && lib_dir != "" && lua_lib != "" {
let _version = use_custom_lua(&include_dir, &lib_dir, &lua_lib).unwrap();
return PathBuf::from(include_dir);
}
// Find using via pkg-config
#[cfg(feature = "lua53")]
{
let mut lua = pkg_config::Config::new()
.range_version((Bound::Included("5.3"), Bound::Excluded("5.4")))
.probe("lua");
if lua.is_err() {
lua = pkg_config::Config::new().probe("lua5.3");
}
return lua.unwrap().include_paths[0].clone();
}
#[cfg(feature = "lua52")]
{
let mut lua = pkg_config::Config::new()
.range_version((Bound::Included("5.2"), Bound::Excluded("5.3")))
.probe("lua");
if lua.is_err() {
lua = pkg_config::Config::new().probe("lua5.2");
}
return lua.unwrap().include_paths[0].clone();
}
#[cfg(feature = "lua51")]
{
let mut lua = pkg_config::Config::new()
.range_version((Bound::Included("5.1"), Bound::Excluded("5.2")))
.probe("lua");
if lua.is_err() {
lua = pkg_config::Config::new().probe("lua5.1");
}
return lua.unwrap().include_paths[0].clone();
}
#[cfg(feature = "luajit")]
{
let lua = pkg_config::Config::new()
.range_version((Bound::Included("2.1.0"), Bound::Unbounded))
.probe("luajit");
return lua.unwrap().include_paths[0].clone();
}
}
fn use_custom_lua<S: AsRef<Path>>(include_dir: &S, lib_dir: &S, lua_lib: &S) -> Result<String> {
let mut version_found = String::new();
// Find LUA_VERSION_NUM
let mut lua_h_path = include_dir.as_ref().to_owned();
lua_h_path.push("lua.h");
let f = File::open(lua_h_path)?;
let reader = BufReader::new(f);
for line in reader.lines() {
let line = line?;
let parts = line.split_whitespace().collect::<Vec<_>>();
if parts.len() == 3 && parts[1] == "LUA_VERSION_NUM" {
version_found = parts[2].to_string();
}
}
let mut link_lib = String::new();
if env::var("LUA_LINK").unwrap_or(String::new()) == "static" {
link_lib = "static=".to_string();
}
println!(
"cargo:rustc-link-search=native={}",
lib_dir.as_ref().display()
);
println!(
"cargo:rustc-link-lib={}{}",
link_lib,
lua_lib.as_ref().display()
);
Ok(version_found)
}
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