initHEADmain

1 files changed, 252 insertions, 0 deletions

diff --git a/src/main.c b/src/main.c
new file mode 100644
index 0000000..b1224a0
--- /dev/null
+++ b/src/main.c
@@ -0,0 +1,252 @@
+/*
+ * 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 <stdio.h>
+#include <getopt.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+
+#include <lua.h>
+#include <lualib.h>
+#include <lauxlib.h>
+
+#include <jack/jack.h>
+
+#include "melisma.h"
+#include "graph.h"
+#include "util.h"
+#include "event.h"
+#include "port.h"
+#include "mem.h"
+#include "io.h"
+
+jack_client_t *client;
+lua_State *state;
+
+static const char *program = NULL;
+static const char *path = NULL;
+static const char *client_name = "melisma";
+static char      **script_argv = NULL;
+
+static void usage(FILE *f)
+{
+	fprintf(f,"Usage: %s [OPTION...] [FILE] [ARG...]\n",program);
+	fprintf(f,"Options:\n");
+	fprintf(f,"\t-h          Show this help message.\n");
+	fprintf(f,"\t-c NAME     Set Jack client name to NAME.\n");
+	fprintf(f,"\t-C PATH     Change working directory to PATH.\n");
+}
+
+static void change_cwd(const char *path)
+{
+	if (chdir(path) < 0)
+	{
+		fprintf(stderr,"%s: %s: %s\n",
+		        program,path,strerror(errno));
+		exit(EXIT_FAILURE);
+	}
+}
+
+static void parse_args(int argc, char **argv)
+{
+	program = argv[0];
+
+	char c;
+	while ((c = getopt(argc, argv, "hc:C:")) != -1)
+	{
+		switch (c)
+		{
+		case 'h':
+			usage(stdout);
+			exit(EXIT_SUCCESS);
+		case 'c':
+			client_name = optarg;
+			break;
+		case 'C':
+			change_cwd(optarg);
+			break;
+		default:
+			usage(stderr);
+			exit(EXIT_FAILURE);
+		}
+	}
+
+	if (optind < argc && strcmp(argv[optind],"-") != 0)
+	{
+		path = argv[optind];
+	}
+
+	script_argv = &argv[optind + 1];
+}
+
+static int l_sample_rate(lua_State *s)
+{
+	lua_pushinteger(s,ml_sample_rate());
+	return 1;
+}
+
+static int load_internal_module(lua_State *s)
+{
+	lua_newtable(s);
+	int tbl = lua_absindex(s,lua_gettop(s));
+
+	lua_pushcfunction(s,l_graph_layout);
+	lua_setfield(s,tbl,"layout");
+	lua_pushcfunction(s,l_sample_rate);
+	lua_setfield(s,tbl,"samplerate");
+
+	lua_newtable(s);
+	int argv_tbl = lua_gettop(s);
+
+	int i = 1;
+	for (; *script_argv; script_argv++)
+	{
+		lua_pushstring(s,*script_argv);
+		lua_rawseti(s,argv_tbl,i++);
+	}
+
+	lua_settop(s,argv_tbl);
+	lua_setfield(s,tbl,"argv");
+
+	lua_settop(s,tbl);
+	return 1;
+}
+
+static void register_internal_module(lua_State *s)
+{
+	int top = lua_gettop(s);
+
+	lua_getglobal(s,"package");
+	int package = lua_gettop(s);
+
+	lua_getfield(s,package,"preload");
+	int preload = lua_gettop(s);
+
+	lua_pushcfunction(s,load_internal_module);
+	lua_setfield(s,preload,"melisma.internal");
+
+	lua_settop(s,top);
+}
+
+static char *read_stdin(void)
+{
+	size_t len = 0;
+	size_t cap = 0;
+	char  *buf = NULL;
+
+	for (;;)
+	{
+		char c = fgetc(stdin);
+
+		if (len == cap)
+		{
+			cap = cap ? 2 * cap : 1024;
+			buf = srealloc(buf, cap);
+		}
+
+		buf[len++] = c == EOF ? 0 : c;
+
+		if (c == EOF)
+		{
+			break;
+		}
+	}
+
+	return buf;
+}
+
+int main(int argc, char **argv)
+{
+	int exitc = EXIT_SUCCESS;
+
+	parse_args(argc,argv);
+
+	client = jack_client_open(client_name,0,NULL);
+
+	if (client == NULL)
+	{
+		fprintf(stderr,"Failed to open Jack client '%s'\n",client_name);
+		exit(EXIT_FAILURE);
+	}
+
+	state = luaL_newstate();
+	luaL_openlibs(state);
+	register_internal_module(state);
+
+	init_graph(state);
+	init_events(state);
+	init_ports(state);
+
+	char *text = NULL;
+	if (path == NULL)
+	{
+		text = read_stdin();
+		if (luaL_loadstring(state,text) != LUA_OK)
+		{
+			const char *err = lua_tostring(state,-1);
+			fprintf(stderr,"%s\n",err);
+			exitc = EXIT_FAILURE;
+			goto cleanup;
+		}
+	}
+	else
+	{
+		if (luaL_loadfile(state,path) != LUA_OK)
+		{
+			const char *err = lua_tostring(state,-1);
+			fprintf(stderr,"%s\n",err);
+			exitc = EXIT_FAILURE;
+			goto cleanup;
+		}
+	}
+
+	if (lua_pcall_with_backtrace(state,0,LUA_MULTRET) != LUA_OK)
+	{
+		const char *err = lua_tostring(state,-1);
+		fprintf(stderr,"%s\n",err);
+		exitc = EXIT_FAILURE;
+		goto cleanup;
+	}
+
+	const char *err = build_graph();
+
+	if (err != NULL)
+	{
+		fprintf(stderr,"Error: %s\n",err);
+		exitc = EXIT_FAILURE;
+		goto cleanup;
+	}
+
+	jack_activate(client);
+
+	ml_add_io_handler(STDIN_FILENO,POLLIN,NULL,NULL);
+	io_loop();
+
+cleanup:
+	free(text);
+	lua_close(state);
+	jack_client_close(client);
+	exit(exitc);
+}
+
+unsigned long ml_sample_rate(void)
+{
+	return jack_get_sample_rate(client);
+}