dfhack/plugins/examples/persistent_per_save_example...

167 lines
5.4 KiB
C++

// This template is appropriate for plugins that periodically check game state
// and make some sort of automated change. These types of plugins typically
// provide a command that can be used to configure the plugin behavior and
// require a world to be loaded before they can function. This kind of plugin
// should persist its state in the savegame and auto-re-enable itself when a
// savegame that had this plugin enabled is loaded.
#include <string>
#include <vector>
#include "df/world.h"
#include "Core.h"
#include "Debug.h"
#include "PluginManager.h"
#include "modules/Persistence.h"
#include "modules/World.h"
using std::string;
using std::vector;
using namespace DFHack;
DFHACK_PLUGIN("persistent_per_save_example");
DFHACK_PLUGIN_IS_ENABLED(is_enabled);
REQUIRE_GLOBAL(world);
// logging levels can be dynamically controlled with the `debugfilter` command.
namespace DFHack {
// for configuration-related logging
DBG_DECLARE(persistent_per_save_example, status, DebugCategory::LINFO);
// for logging during the periodic scan
DBG_DECLARE(persistent_per_save_example, cycle, DebugCategory::LINFO);
}
static const string CONFIG_KEY = string(plugin_name) + "/config";
static PersistentDataItem config;
enum ConfigValues {
CONFIG_IS_ENABLED = 0,
CONFIG_CYCLE_TICKS = 1,
};
static int get_config_val(int index) {
if (!config.isValid())
return -1;
return config.ival(index);
}
static bool get_config_bool(int index) {
return get_config_val(index) == 1;
}
static void set_config_val(int index, int value) {
if (config.isValid())
config.ival(index) = value;
}
static void set_config_bool(int index, bool value) {
set_config_val(index, value ? 1 : 0);
}
static int32_t cycle_timestamp = 0; // world->frame_counter at last cycle
static command_result do_command(color_ostream &out, vector<string> &parameters);
static void do_cycle(color_ostream &out);
DFhackCExport command_result plugin_init(color_ostream &out, std::vector <PluginCommand> &commands) {
DEBUG(status,out).print("initializing %s\n", plugin_name);
// provide a configuration interface for the plugin
commands.push_back(PluginCommand(
plugin_name,
"Short (~54 character) description of command.",
do_command));
return CR_OK;
}
DFhackCExport command_result plugin_enable(color_ostream &out, bool enable) {
if (!Core::getInstance().isWorldLoaded()) {
out.printerr("Cannot enable %s without a loaded world.\n", plugin_name);
return CR_FAILURE;
}
if (enable != is_enabled) {
is_enabled = enable;
DEBUG(status,out).print("%s from the API; persisting\n",
is_enabled ? "enabled" : "disabled");
set_config_bool(CONFIG_IS_ENABLED, is_enabled);
} else {
DEBUG(status,out).print("%s from the API, but already %s; no action\n",
is_enabled ? "enabled" : "disabled",
is_enabled ? "enabled" : "disabled");
}
return CR_OK;
}
DFhackCExport command_result plugin_shutdown (color_ostream &out) {
DEBUG(status,out).print("shutting down %s\n", plugin_name);
return CR_OK;
}
DFhackCExport command_result plugin_load_data (color_ostream &out) {
config = World::GetPersistentData(CONFIG_KEY);
if (!config.isValid()) {
DEBUG(status,out).print("no config found in this save; initializing\n");
config = World::AddPersistentData(CONFIG_KEY);
set_config_bool(CONFIG_IS_ENABLED, is_enabled);
set_config_val(CONFIG_CYCLE_TICKS, 6000);
}
// we have to copy our enabled flag into the global plugin variable, but
// all the other state we can directly read/modify from the persistent
// data structure.
is_enabled = get_config_bool(CONFIG_IS_ENABLED);
DEBUG(status,out).print("loading persisted enabled state: %s\n",
is_enabled ? "true" : "false");
return CR_OK;
}
DFhackCExport command_result plugin_onstatechange(color_ostream &out, state_change_event event) {
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if (event == DFHack::SC_WORLD_UNLOADED) {
if (is_enabled) {
DEBUG(status,out).print("world unloaded; disabling %s\n",
plugin_name);
is_enabled = false;
}
}
return CR_OK;
}
DFhackCExport command_result plugin_onupdate(color_ostream &out) {
if (is_enabled && world->frame_counter - cycle_timestamp >= get_config_val(CONFIG_CYCLE_TICKS))
do_cycle(out);
return CR_OK;
}
static command_result do_command(color_ostream &out, vector<string> &parameters) {
// be sure to suspend the core if any DF state is read or modified
CoreSuspender suspend;
if (!Core::getInstance().isWorldLoaded()) {
out.printerr("Cannot run %s without a loaded world.\n", plugin_name);
return CR_FAILURE;
}
// TODO: configuration logic
// simple commandline parsing can be done in C++, but there are lua libraries
// that can easily handle more complex commandlines. see the blueprint plugin
// for an example.
return CR_OK;
}
/////////////////////////////////////////////////////
// cycle logic
//
static void do_cycle(color_ostream &out) {
// mark that we have recently run
cycle_timestamp = world->frame_counter;
DEBUG(cycle,out).print("running %s cycle\n", plugin_name);
// TODO: logic that runs every get_config_val(CONFIG_CYCLE_TICKS) ticks
}