cache entities to avoid allocations

Signed-off-by: Folling <mail@folling.io>

include/ikarus/errors.h

@@ -0,0 +1,71 @@
+#pragma once
+
+/// \file global.h
+/// \author Folling <folling@ikarus.world>
+
+#include <ikarus/macros.h>
+
+/// \addtogroup errors Errors
+/// \brief Error handling within libikarus
+/// \details Errors are stored for each project, akin to the errno handling in C.
+/// We store multiple pieces of information about the error occurring. For more information see
+/// #ikarus_project_get_error_message.
+/// @{
+
+IKARUS_BEGIN_HEADER
+
+/// \brief Delineates what caused an error.
+/// \details First 2 bytes delineate the major type, next 2 bytes delineate the minor type, next 4 bytes delineate the detail
+/// type.
+/// \remark Note that this doesn't show responsibility. An error with source "SubSystem" could still be the fault of
+/// libikarus.
+enum IkarusErrorInfo {
+    /// \brief No error occurred.
+    IkarusErrorInfo_Source_None = 0x0001000000000000,
+    /// \brief The error was caused by the client.
+    IkarusErrorInfo_Source_Client = 0x0001000000000001,
+    /// \brief The error was caused by a sub-system of libikarus.
+    IkarusErrorInfo_Source_SubSystem = 0x0001000000000002,
+    /// \brief The error was caused by libikarus itself.
+    IkarusErrorInfo_Source_LibIkarus = 0x0001000000000003,
+    /// \brief The error was caused by an unknown source.
+    IkarusErrorInfo_Source_Unknown = 0x00010000FFFFFFFF,
+    /// \brief No error occurred.
+    IkarusErrorInfo_Type_None = 0x0002000000000000,
+    /// \brief The user misused the API.
+    /// \example Accessing a resource that does not exist.
+    IkarusErrorInfo_Type_Client_Misuse = 0x0002000100000001,
+    /// \brief The user provided invalid input.
+    /// \example Passing null for a pointer that must not be null.
+    IkarusErrorInfo_Type_Client_Input = 0x0002000100000002,
+    /// \brief An error occurred while interacting with a dependency from ikarus.
+    /// \example An error occurred in the underlying OS library.
+    IkarusErrorInfo_Type_SubSystem_Dependency = 0x0002000200000001,
+    /// \brief An error occurred while interacting with the database.
+    /// \example An error occurred while executing a query.
+    IkarusErrorInfo_Type_SubSystem_Database = 0x0002000200000002,
+    /// \brief An error occurred while interacting with the filesystem.
+    /// \example An error occurred while reading a file.
+    IkarusErrorInfo_Type_SubSystem_Filesystem = 0x0002000200000003,
+    /// \brief A datapoint within ikarus is invalid for the current state of the system.
+    /// \example The name of an object is found to be invalid UTF8.
+    IkarusErrorInfo_Type_LibIkarus_InvalidState = 0x0002000300000001,
+    /// \brief LibIkarus is unable to perform a certain operation that should succeed.
+    /// \example Migrating a project fails
+    IkarusErrorInfo_Type_LibIkarus_CannotPerformOperation = 0x0002000300000002,
+    /// \brief LibIkarus is unable to perform a certain operation within a given timeframe.
+    /// \example A query takes longer than the timeout.
+    IkarusErrorInfo_Type_LibIkarus_Timeout = 0x0002000300000003,
+    /// \brief The type of error is unknown.
+    IkarusErrorInfo_Type_Unknown = 0xFFFFFFFF,
+};
+
+/// \brief Gets the name of an error info.
+/// \param info The error info to get the name of.
+/// \return The name of the error info.
+/// \remark The returned pointer is valid for the lifetime of the program and must not be freed.
+IKA_API char const * get_error_info_name(IkarusErrorInfo info);
+
+IKARUS_END_HEADER
+
+/// @}