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extern crate libc;
#[macro_use]
extern crate emacs;
extern crate libloading as lib;
#[macro_use]
extern crate lazy_static;
use emacs::{Env, Value, Result, HandleFunc};
use emacs::raw::emacs_env;
use std::ptr;
use std::collections::HashMap;
use std::sync::Mutex;
emacs_plugin_is_GPL_compatible!();
emacs_module_init!(init);
lazy_static! {
static ref LIBRARIES: Mutex<HashMap<String, lib::Library>> = Mutex::new(HashMap::new());
}
const INIT_FROM_ENV: &str = "emacs_rs_module_init";
const RS_MODULE: &str = "rs-module";
macro_rules! message {
($env:expr, $fmt:expr $(, $args:expr)*) => {
$env.message(&format!($fmt $(, $args)*))
};
}
fn load_module(env: &mut Env, args: &[Value], _data: *mut libc::c_void) -> Result<Value> {
let path: String = env.get_owned(&args[0])?;
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)
}
fn init(env: &mut Env) -> Result<Value> {
message!(env, "[{}]: loading...", RS_MODULE)?;
emacs_subrs!(
load_module -> f_load_module;
);
message!(env, "[{}]: defining functions...", RS_MODULE)?;
env.register(
&format!("{}/load", RS_MODULE),f_load_module, 1..1,
&format!("Load a dynamic module that defines {}.", INIT_FROM_ENV),
ptr::null_mut()
)?;
env.provide(RS_MODULE)
}