/*
 * Copyright © 2021 Michael Smith <mikesmiffy128@gmail.com>
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
 * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "../os.h"
#include "cmeta.h"

static const char *cmdnames[4096]; // arbitrary limit!
static int ncmdnames = 0;
static const char *varnames[4096]; // arbitrary limit!
static int nvarnames = 0;

static void die(const char *s) {
	fprintf(stderr, "codegen: %s\n", s);
	exit(100);
}

#define PUT(array, ent) do { \
	if (n##array == sizeof(array) / sizeof(*array)) { \
		fprintf(stderr, "codegen: out of space; make " #array " bigger!\n"); \
		exit(1); \
	} \
	array[n##array++] = ent; \
} while (0)

static void oncondef(const char *name, bool isvar) {
	if (isvar) PUT(varnames, name); else PUT(cmdnames, name);
}

#define _(x) \
	if (fprintf(out, "%s\n", x) < 0) die("couldn't write to file");
#define F(f, ...) \
	if (fprintf(out, f "\n", __VA_ARGS__) < 0) die("couldn't write to file");
#define H() \
_( "/* This file is autogenerated by src/build/codegen.c. DO NOT EDIT! */") \
_( "")

int OS_MAIN(int argc, os_char *argv[]) {
	for (++argv; *argv; ++argv) {
		const struct cmeta *cm = cmeta_loadfile(*argv);
		cmeta_conmacros(cm, &oncondef);
	}

	FILE *out = fopen(".build/include/cmdinit.gen.h", "wb");
	if (!out) die("couldn't open cmdinit.gen.h");
	H();
	for (const char *const *pp = cmdnames;
			pp - cmdnames < ncmdnames; ++pp) {
F( "extern struct con_cmd *%s;", *pp)
	}
	for (const char *const *pp = varnames;
			pp - varnames < nvarnames; ++pp) {
F( "extern struct con_var *%s;", *pp)
	}
_( "")
_( "static void regcmds(void (*VCALLCONV f)(void *, void *)) {")
	for (const char *const *pp = cmdnames;
			pp - cmdnames < ncmdnames; ++pp) {
F( "	f(_con_iface, %s);", *pp)
	}
	for (const char *const *pp = varnames;
			pp - varnames < nvarnames; ++pp) {
F( "	initval(%s);", *pp)
F( "	f(_con_iface, %s);", *pp)
	}
_( "}")
_( "")
_( "static void freevars(void) {")
	for (const char *const *pp = varnames;
			pp - varnames < nvarnames; ++pp) {
F( "	extfree(%s->strval);", *pp)
	}
_( "}")
	if (fflush(out) == EOF) die("couldn't fully write cmdinit.gen.h");

	return 0;
}

// vi: sw=4 ts=4 noet tw=80 cc=80