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extern crate libc;
#[macro_use]
extern crate emacs_module_bindings as emacs;
extern crate libloading as lib;
#[macro_use]
extern crate lazy_static;
use emacs::{EmacsVal, EmacsRT, EmacsEnv, ConvResult};
use emacs::native2elisp as n2e;
use emacs::elisp2native as e2n;
use std::os::raw;
use std::ptr;
use std::ffi::CString;
use std::collections::HashMap;
use std::sync::Mutex;
#[no_mangle]
#[allow(non_upper_case_globals)]
pub static plugin_is_GPL_compatible: libc::c_int = 0;
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";
fn load_module(env: *mut EmacsEnv, path: String) -> ConvResult<EmacsVal> {
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 EmacsEnv) -> u32> =
l.get(INIT_FROM_ENV.as_bytes())?;
rs_init(env);
}
libraries.insert(path.clone(), l);
message!(env, "[{}]: loaded and initialized", &path)
}
emacs_subrs!(
f_load_module(env, _nargs, args, _data, _tag) {
let path = e2n::string(env, *args.offset(0))?;
load_module(env, path)
};
);
fn load(env: *mut EmacsEnv) -> libc::c_int {
let fn_name = format!("{}/load", RS_MODULE);
message!(env, "[{}]: loading...", RS_MODULE).unwrap();
message!(env, "[{}]: binding functions...", RS_MODULE).unwrap();
let load_doc = CString::new(format!("Load a dynamic module that defines {}.", INIT_FROM_ENV)).unwrap();
emacs::bind_function(
env, fn_name.to_string(),
match n2e::function(env, 1, 1, Some(f_load_module), load_doc.as_ptr(), ptr::null_mut()) {
Ok(x) => x,
Err(e) => {
message!(env, "[{}]: cannot make function '{}': {:?}", RS_MODULE, fn_name, e).unwrap();
return 1;
}
},
);
emacs::provide(env, RS_MODULE.to_string());
0
}
#[no_mangle]
pub extern "C" fn emacs_module_init(ert: *mut EmacsRT) -> libc::c_int {
let env = emacs::get_environment(ert);
load(env)
}