we're now loading a config file!

src/lua/lua.zig

@@ -0,0 +1,72 @@
+const Lua = @This();
+
+const std = @import("std");
+const config = @import("config");
+const zlua = @import("zlua");
+
+const Bridge = @import("bridge.zig");
+
+const gpa = std.heap.c_allocator;
+
+state: *zlua.Lua,
+
+fn loadRuntimeDir(self: *Lua) !void {
+  const tmppath = try std.fs.path.join(gpa, &[_][]const u8{
+    config.runtime_path_prefix,
+    "share",
+    "mezzaluna",
+    "init.lua",
+  });
+  const path = try gpa.dupeZ(u8, tmppath);
+
+  self.state.doFile(path) catch {
+    const err = try self.state.toString(-1);
+    std.log.debug("Failed to run lua file: {s}", .{err});
+  };
+}
+
+fn loadConfigDir(self: *Lua) !void {
+  const lua_path = "mez.path.config";
+  if (!Bridge.getNestedField(self, @constCast(lua_path[0..]))) {
+    std.log.err("Config path not found. is your runtime dir setup?", .{});
+    return;
+  }
+  const path = self.state.toString(-1) catch |err| {
+    std.log.err("Failed to pop the config path from the lua stack. {}", .{err});
+    return;
+  };
+  self.state.pop(-1);
+  try self.state.doFile(path);
+}
+
+pub fn init(self: *Lua) !void {
+  self.state = try zlua.Lua.init(gpa);
+  errdefer self.state.deinit();
+  self.state.openLibs();
+
+  {
+    self.state.newTable();
+    defer _ = self.state.setGlobal("mez");
+    {
+      self.state.newTable();
+      defer _ = self.state.setField(-2, "path");
+    }
+  }
+
+  loadRuntimeDir(self) catch |err| {
+    if (err == error.LuaRuntime) {
+      std.log.warn("{s}", .{try self.state.toString(-1)});
+    }
+  };
+  loadConfigDir(self) catch |err| {
+    if (err == error.LuaRuntime) {
+      std.log.warn("{s}", .{try self.state.toString(-1)});
+    }
+  };
+
+  std.log.debug("Loaded lua", .{});
+}
+
+pub fn deinit(self: *Lua) void {
+  self.state.deinit();
+}