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/*
* melisma - extensible and scriptable audio engine
* Copyright (C) 2026 Ludvig Gunne Lindström
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include <lauxlib.h>
#include "melisma.h"
#include "melisma/ring.h"
static int fn = LUA_NOREF;
static struct termios tty = {0};
static struct termios oldtty = {0};
static lua_State *state;
static ml_ring *ring = NULL;
static void make_arg(lua_State *s, size_t len, const void *data)
{
lua_pushlstring(s,data,len);
}
static void io_handler(int fd, int flags, void *args)
{
char c;
if (read(fd,&c,sizeof c) <= 0)
{
return;
}
ml_ring_put_blocking(ring,*(uint8_t*) &c);
}
static void cleanup(void)
{
tcsetattr(STDIN_FILENO,TCSANOW,&oldtty);
}
static void proc(const ml_proc_args *args)
{
if (fn == LUA_NOREF)
{
return;
}
char buf[1];
while (ml_ring_read(ring,buf,sizeof buf) == sizeof buf)
{
lua_pushlstring(state,buf,sizeof buf);
int arg = luaL_ref(state,LUA_REGISTRYINDEX);
ml_schedule_event(0,fn,arg);
}
}
static void setup(lua_State *s)
{
static bool init = false;
if (init)
{
return;
}
init = true;
tcgetattr(STDIN_FILENO,&oldtty);
tty = oldtty;
tty.c_lflag &= ~ECHO;
tty.c_lflag &= ~ICANON;
tcsetattr(STDIN_FILENO,TCSANOW,&tty);
tcflush(STDIN_FILENO,TCIFLUSH);
ml_add_io_handler(STDIN_FILENO,POLLIN,io_handler,NULL);
ring = ml_ring_init(4096);
state = s;
ml_node *node = ml_create_node(proc,NULL);
ml_channel *src = ml_add_output(node);
ml_channel *dst = ml_add_input(ml_get_root_node());
ml_connect(src,dst);
ml_label_node(node,"keycallback");
atexit(cleanup);
}
static int l_set(lua_State *s)
{
if (fn != LUA_NOREF)
{
luaL_unref(s,LUA_REGISTRYINDEX,fn);
fn = LUA_NOREF;
}
if (lua_isnil(s,1))
{
return 0;
}
luaL_checktype(s,1,LUA_TFUNCTION);
lua_pushvalue(s,1);
fn = luaL_ref(s,LUA_REGISTRYINDEX);
setup(s);
return 0;
}
int luaopen_melisma_keycallback(lua_State *s)
{
/*** Set callback for keyboard input.
local mkeycallback = require 'melisma.keycallback'
mkeycallback.set(function(c)
print('you pressed', c)
end)
@module keycallback
*/
lua_newtable(s);
int tbl = lua_absindex(s,lua_gettop(s));
/*** Set the callback.
@function set
@tparam function fn Callback function.
*/
lua_pushcfunction(s,l_set);
lua_setfield(s,tbl,"set");
lua_settop(s,tbl);
return 1;
}
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