feat: package info

1 files changed, 125 insertions, 0 deletions

diff --git a/src/package.c b/src/package.c
index e69de29..2e571e9 100644
--- a/src/package.c
+++ b/src/package.c
@@ -0,0 +1,125 @@
+#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");
+  }
+
+  return 0;
+}
+
+int 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);
+
+  return 0;
+}
+
+int package_close(pow_package *pkg) {
+  free(pkg->name);
+  free(pkg->version);
+
+  lua_close(pkg->L);
+
+  return 0;
+}