lua build system integration

1 files changed, 58 insertions, 0 deletions

diff --git a/src/lua_build.cc b/src/lua_build.cc
new file mode 100644
index 0000000..b75e2f3
--- /dev/null
+++ b/src/lua_build.cc
@@ -0,0 +1,58 @@
+#include <iostream>
+#include <filesystem>
+#include <map>
+#include <lua5.1/lua.h>
+#include <lua5.1/lauxlib.h>
+#include <lua5.1/lualib.h>
+
+#include "vars.cc"
+
+std::map<std::string, int> build_files;
+
+void lua_build (const char *path) {
+  lua_State *L = lua_open();
+  luaL_openlibs(L);
+
+  if (luaL_loadfile(L, config_file.c_str()) || lua_pcall(L, 0, 0, 0)){
+    std::cout << print_error << "cannot run configuration script: " << lua_tostring(L, -1) << "\n";
+  }
+
+  lua_getglobal(L, "build_systems");
+
+  if (!lua_istable(L, -1)) {
+    std::cout << print_error << "lua variable 'build_systems' is not a table.\n";
+  }
+
+  lua_pushnil(L);
+
+  bool build_found = false;
+  while (lua_next(L, -2) != 0) {
+    const char *key = lua_tostring(L, -2);
+    int value = lua_type(L, -1);
+
+    if (lua_isfunction(L, -1) == 0) {
+      std::cout << print_error << "build value is not a function\n";
+      lua_pop(L, 1);
+      continue;
+    }
+
+    build_files[key] = value;
+
+    for (auto const& dir_entry : std::filesystem::directory_iterator(std::filesystem::current_path().string())) {
+      std::string string_key = key;
+      if (dir_entry.path().filename() != string_key) { continue; }
+      build_found = true;
+      lua_pushvalue(L, -1);
+      lua_pushstring(L, std::filesystem::current_path().string().c_str());
+      std::cout << "calling lua build function according to key filename '"<< key << "'...\n";
+      if (lua_pcall(L, 1, 0, 0) != 0) {
+        std::cout << print_error << "lua build function failed to run\n";
+      }
+      if (build_found) { break; }
+    }
+    lua_pop(L, 1);
+  }
+  if (!build_found) {
+    std::cout << print_error << "no usable build system was found\n";
+  }
+}