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use libloading as lib;
use lazy_static::lazy_static;
use std::collections::HashMap;
use std::sync::Mutex;
use emacs::{defun, Env, Value, Result};
use emacs::raw::emacs_env;
emacs::plugin_is_GPL_compatible!();
lazy_static! {
static ref LIBRARIES: Mutex<HashMap<String, lib::Library>> = Mutex::new(HashMap::new());
}
const INIT_FROM_ENV: &str = "emacs_rs_module_init";
macro_rules! message {
($env:expr, $fmt:expr $(, $args:expr)*) => {
$env.message(&format!($fmt $(, $args)*))
};
}
#[emacs::module(name = "rs-module", separator = "/")]
fn init(env: &Env) -> Result<Value<'_>> {
message!(env, "[rs-module]: defined functions...")
}
#[defun]
fn load(env: &Env, path: String) -> Result<Value<'_>> {
let mut libraries = LIBRARIES.lock()
.expect("Failed to acquire lock for module map");
match libraries.remove(&path) {
Some(l) => message!(env, "[{}]: unloaded {:?}...", &path, &l)?,
None => message!(env, "[{}]: not loaded yet", &path)?,
};
message!(env, "[{}]: loading...", &path)?;
let l = lib::Library::new(&path)?;
message!(env, "[{}]: initializing...", &path)?;
unsafe {
let rs_init: lib::Symbol<'_, unsafe extern fn(*mut emacs_env) -> u32> =
l.get(INIT_FROM_ENV.as_bytes())?;
rs_init(env.raw());
}
libraries.insert(path.clone(), l);
message!(env, "[{}]: loaded and initialized", &path)
}