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#![allow(dead_code)]
use std::env;
use std::ops::Bound;
use std::path::PathBuf;
fn get_env_var(name: &str) -> String {
match env::var(name) {
Ok(val) => val,
Err(env::VarError::NotPresent) => String::new(),
Err(err) => panic!("cannot get {name}: {err}"),
}
}
pub fn probe_lua() -> Option<PathBuf> {
let include_dir = get_env_var("LUA_INC");
let lib_dir = get_env_var("LUA_LIB");
let lua_lib = get_env_var("LUA_LIB_NAME");
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");
let need_lua_lib = cfg!(any(not(feature = "module"), target_os = "windows"));
if !include_dir.is_empty() {
if need_lua_lib {
if lib_dir.is_empty() {
panic!("LUA_LIB is not set");
}
if lua_lib.is_empty() {
panic!("LUA_LIB_NAME is not set");
}
let mut link_lib = "";
if get_env_var("LUA_LINK") == "static" {
link_lib = "static=";
};
println!("cargo:rustc-link-search=native={lib_dir}");
println!("cargo:rustc-link-lib={link_lib}{lua_lib}");
}
return Some(PathBuf::from(include_dir));
}
// Find using `pkg-config`
#[cfg(feature = "lua54")]
let (incl_bound, excl_bound, alt_probe, ver) = ("5.4", "5.5", "lua5.4", "5.4");
#[cfg(feature = "lua53")]
let (incl_bound, excl_bound, alt_probe, ver) = ("5.3", "5.4", "lua5.3", "5.3");
#[cfg(feature = "lua52")]
let (incl_bound, excl_bound, alt_probe, ver) = ("5.2", "5.3", "lua5.2", "5.2");
#[cfg(feature = "lua51")]
let (incl_bound, excl_bound, alt_probe, ver) = ("5.1", "5.2", "lua5.1", "5.1");
#[cfg(any(
feature = "lua54",
feature = "lua53",
feature = "lua52",
feature = "lua51"
))]
{
let mut lua = pkg_config::Config::new()
.range_version((Bound::Included(incl_bound), Bound::Excluded(excl_bound)))
.cargo_metadata(need_lua_lib)
.probe("lua");
if lua.is_err() {
lua = pkg_config::Config::new()
.cargo_metadata(need_lua_lib)
.probe(alt_probe);
}
lua.unwrap_or_else(|_| panic!("cannot find Lua {ver} using `pkg-config`"))
.include_paths
.get(0)
.cloned()
}
#[cfg(feature = "luajit")]
{
let lua = pkg_config::Config::new()
.range_version((Bound::Included("2.0.4"), Bound::Unbounded))
.cargo_metadata(need_lua_lib)
.probe("luajit");
lua.expect("cannot find LuaJIT using `pkg-config`")
.include_paths
.get(0)
.cloned()
}
}
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