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#include "package.h"
#include "lauxlib.h"
#include "lualib.h"
#include "malloc.h"
#include "pow_lua.h"
#include "stdio.h"
#include "string.h"
int extract_package_info(lua_State *L, pow_package *pkg) {
lua_getfield(L, -1, "name");
if (!lua_isstring(L, -1)) {
printf("invalid package, name is not string (or doesn't exist)\n");
return 1;
}
pkg->name = strdup(lua_tostring(L, -1));
if (!pkg->name) {
printf("strdup failed trying to get package name\n");
return 1;
}
lua_pop(L, 1);
lua_getfield(L, -1, "version");
if (!lua_isstring(L, -1)) {
printf("invalid package, version is not string (or doesn't exist)\n");
return 1;
}
pkg->version = strdup(lua_tostring(L, -1));
if (!pkg->version) {
printf("strdup failed trying to get package name\n");
}
pkg->pkg_ref = luaL_ref(L, LUA_REGISTRYINDEX);
return 0;
}
int pow_package_open(pow_package *pkg, const char *path) {
FILE *fp;
int c;
int err;
fp = fopen(path, "r");
if (!fp) {
printf("error opening package definition, doesn't exist?\n");
return 1;
}
char *package_buffer = malloc(4096);
size_t total = 0;
size_t capacity = 4096;
while ((c = fgetc(fp)) != EOF) {
if (total + 1 >= capacity) {
capacity *= 2;
char *tmp = realloc(package_buffer, capacity);
if (!tmp) {
fclose(fp);
printf("failed to realloc package buffer\n");
return 1;
}
printf("reallocated package buffer due to size constraints\n");
package_buffer = tmp;
}
package_buffer[total++] = c;
}
package_buffer[total] = '\0';
lua_State *L = luaL_newstate();
pkg->L = L;
luaL_openlibs(L);
pow_lua_load(L);
luaL_loadstring(L, package_buffer);
err = lua_pcall(L, 0, 1, 0);
free(package_buffer);
if (err) {
printf("%s\n", lua_tostring(L, -1));
return 1;
}
if (!lua_istable(L, -1)) {
printf("invalid package, scripts must return table\n");
return 1;
}
extract_package_info(L, pkg);
pkg->path = path;
return 0;
}
int pow_package_close(pow_package *pkg) {
free(pkg->name);
free(pkg->version);
lua_close(pkg->L);
return 0;
}
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