mirror of
https://github.com/MeshEnvy/lobbs.git
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59 lines
3.2 KiB
C++
59 lines
3.2 KiB
C++
#pragma once
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#include "LoBBSCommandCtx.h"
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#include "LoBBSResponse.h"
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#include <loscalar/LoScalar.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <string>
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#include <vector>
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/**
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* Hook bus modeled on WordPress actions and filters.
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*
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* A filter threads one value through its handlers in priority order. The caller supplies the
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* initial value (defaults go there), each handler modifies it in place or leaves it alone, and the
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* caller gets the result. Actions are fire-and-forget. Every hook receives `args` as a LoScalar.
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*
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* The hook name fixes the value kind and the field conventions:
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*
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* | Hook | Kind | Initial value (caller) | args |
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* |------------------|--------|---------------------------------|-----------------------|
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* | `slash_cmd` | action | n/a | verb, rest |
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* | `seed` | action | n/a | none |
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* | `help_topics` | list | builtin topics | none |
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* | `help_for_topic` | record | title = topic, no description | title = query |
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* | `status_lines` | list | empty | none |
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* | `display_human` | record | title = generic rendering | the record to render |
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* | `config_keys` | list | empty | none |
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* | `config_validate`| record | title = key, field 0 = value | key definition record |
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* | `config_changed` | action | n/a | title = key, field 0 = value |
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* | `install_mounts` | list | empty (title = mount name) | none |
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*
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* Records use `title` and `description` (LODB_F_TITLE / LODB_F_DESCRIPTION) unless noted.
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* Validation filters may set LODB_F_ERROR on the value record; set succeeds only if it stays empty.
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* `slash_cmd` args use LOBBS_ARG_VERB / LOBBS_ARG_REST; C++ handlers parse ctx->rest.
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*/
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static constexpr int LOBBS_HOOK_PRIORITY_HELP = 0;
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static constexpr int LOBBS_HOOK_PRIORITY_AUTH = 10;
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static constexpr int LOBBS_HOOK_PRIORITY_FEATURE = 20;
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static constexpr int LOBBS_HOOK_PRIORITY_STATUS = 30;
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static constexpr int LOBBS_HOOK_PRIORITY_TIME = 31;
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static constexpr int LOBBS_HOOK_PRIORITY_DEFAULT = 10;
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static constexpr uint32_t LOBBS_ARG_VERB = 0;
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static constexpr uint32_t LOBBS_ARG_REST = 1;
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using LoBBSActionFn = void (*)(LoBBSCommandCtx *ctx, const LoScalar &args);
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using LoBBSRecordFilterFn = void (*)(LoBBSCommandCtx *ctx, LoScalar &value, const LoScalar &args);
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using LoBBSListFilterFn = void (*)(LoBBSCommandCtx *ctx, std::vector<LoScalar> &value, const LoScalar &args);
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void lobbsHooksReset();
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void lobbsAddAction(const char *name, LoBBSActionFn fn, int priority = LOBBS_HOOK_PRIORITY_DEFAULT);
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void lobbsAddFilter(const char *name, LoBBSRecordFilterFn fn, int priority = LOBBS_HOOK_PRIORITY_DEFAULT);
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void lobbsAddFilter(const char *name, LoBBSListFilterFn fn, int priority = LOBBS_HOOK_PRIORITY_DEFAULT);
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void lobbsDoAction(const char *name, LoBBSCommandCtx &ctx, const LoScalar &args);
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void lobbsApplyFilter(const char *name, LoBBSCommandCtx &ctx, LoScalar &value, const LoScalar &args);
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void lobbsApplyFilter(const char *name, LoBBSCommandCtx &ctx, std::vector<LoScalar> &value, const LoScalar &args);
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