mirror of
https://github.com/Llewellynvdm/conky.git
synced 2024-10-02 15:09:07 +00:00
254 lines
6.5 KiB
C++
254 lines
6.5 KiB
C++
/* -*- mode: c++; c-basic-offset: 4; tab-width: 4; indent-tabs-mode: t -*-
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* vim: ts=4 sw=4 noet ai cindent syntax=cpp
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*
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* Conky, a system monitor, based on torsmo
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*
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* Please see COPYING for details
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*
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* Copyright (C) 2010 Pavel Labath et al.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <config.h>
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#include "setting.hh"
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#include <algorithm>
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#include <memory>
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#include <vector>
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#include <unordered_map>
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namespace conky {
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namespace {
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typedef std::unordered_map<std::string, priv::config_setting_base *> settings_map;
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typedef std::vector<priv::config_setting_base *> settings_vector;
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/*
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* We cannot construct this object statically, because order of object construction in
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* different modules is not defined, so config_setting_base could be called before this
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* object is constructed. Therefore, we create it on the first call to
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* config_setting_base constructor.
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*/
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settings_map *settings;
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/*
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* Returns the setting record corresponding to the value at the specified index. If the
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* value is not valid, returns NULL and prints an error.
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*/
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priv::config_setting_base* get_setting(lua::state &l, int index)
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{
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lua::Type type = l.type(index);
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if(type != lua::TSTRING) {
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NORM_ERR("invalid setting of type '%s'", l.type_name(type));
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return NULL;
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}
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const std::string &name = l.tostring(index);
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auto iter = settings->find(name);
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if(iter == settings->end()) {
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NORM_ERR("Unknown setting '%s'", name.c_str());
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return NULL;
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}
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return iter->second;
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}
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// returns a vector of all settings, sorted in order of registration
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settings_vector make_settings_vector()
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{
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settings_vector ret;
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ret.reserve(settings->size());
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for(auto i = settings->begin(); i != settings->end(); ++i)
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ret.push_back(i->second);
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sort(ret.begin(), ret.end(), &priv::config_setting_base::seq_compare);
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return ret;
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}
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/*
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* Returns the seq_no for the new setting object. Also constructs settings object
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* if needed.
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*/
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size_t get_next_seq_no()
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{
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struct settings_constructor {
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settings_constructor() { settings = new settings_map; }
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~settings_constructor() { delete settings; settings = NULL; }
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};
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static settings_constructor constructor;
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return settings->size();
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}
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}
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namespace priv {
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config_setting_base::config_setting_base(const std::string &name_)
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: name(name_), seq_no(get_next_seq_no())
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{
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bool inserted = settings->insert({name, this}).second;
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if(not inserted)
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throw std::logic_error("Setting with name '" + name + "' already registered");
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}
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void config_setting_base::lua_set(lua::state &l)
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{
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std::lock_guard<lua::state> guard(l);
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lua::stack_sentry s(l, -1);
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l.checkstack(2);
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l.getglobal("conky");
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l.rawgetfield(-1, "config");
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l.replace(-2);
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l.insert(-2);
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l.setfield(-2, name.c_str());
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l.pop();
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}
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/*
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* Performs the actual assignment of settings. Calls the setting-specific setter after
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* some sanity-checking.
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* stack on entry: | ..., new_config_table, key, value, old_value |
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* stack on exit: | ..., new_config_table |
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*/
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void config_setting_base::process_setting(lua::state &l, bool init)
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{
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lua::stack_sentry s(l, -3);
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config_setting_base *ptr = get_setting(l, -3);
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if(not ptr)
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return;
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ptr->lua_setter(l, init);
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l.pushvalue(-2);
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l.insert(-2);
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l.rawset(-4);
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}
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/*
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* Called when user sets a new value for a setting
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* stack on entry: | config_table, key, value |
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* stack on exit: | |
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*/
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int config_setting_base::config__newindex(lua::state *l)
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{
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lua::stack_sentry s(*l, -3);
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l->checkstack(1);
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l->getmetatable(-3);
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l->replace(-4);
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l->pushvalue(-2);
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l->rawget(-4);
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process_setting(*l, false);
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return 0;
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}
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/*
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* conky.config will not be a table, but a userdata with some metamethods we do this
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* because we want to control access to the settings we use the metatable for storing the
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* settings, that means having a setting whose name starts with "__" is a bad idea
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* stack on entry: | ... |
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* stack on exit: | ... new_config_table |
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*/
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void config_setting_base::make_conky_config(lua::state &l)
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{
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lua::stack_sentry s(l);
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l.checkstack(3);
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l.newuserdata(1);
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l.newtable(); {
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l.pushboolean(false);
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l.rawsetfield(-2, "__metatable");
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l.pushvalue(-1);
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l.rawsetfield(-2, "__index");
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l.pushfunction(&priv::config_setting_base::config__newindex);
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l.rawsetfield(-2, "__newindex");
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} l.setmetatable(-2);
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++s;
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}
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}
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void set_config_settings(lua::state &l)
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{
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lua::stack_sentry s(l);
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l.checkstack(6);
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// Force creation of settings map. In the off chance we have no settings.
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get_next_seq_no();
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l.getglobal("conky"); {
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if(l.type(-1) != lua::TTABLE)
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throw std::runtime_error("conky must be a table");
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l.rawgetfield(-1, "config"); {
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if(l.type(-1) != lua::TTABLE)
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throw std::runtime_error("conky.config must be a table");
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priv::config_setting_base::make_conky_config(l);
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l.rawsetfield(-3, "config");
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l.rawgetfield(-2, "config"); l.getmetatable(-1); l.replace(-2); {
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const settings_vector &v = make_settings_vector();
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for(size_t i = 0; i < v.size(); ++i) {
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l.pushstring(v[i]->name);
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l.rawgetfield(-3, v[i]->name.c_str());
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l.pushnil();
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priv::config_setting_base::process_setting(l, true);
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}
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} l.pop();
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// print error messages for unknown settings
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l.pushnil();
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while(l.next(-2)) {
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l.pop();
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get_setting(l, -1);
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}
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} l.pop();
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} l.pop();
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}
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void cleanup_config_settings(lua::state &l)
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{
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lua::stack_sentry s(l);
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l.checkstack(2);
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l.getglobal("conky");
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l.rawgetfield(-1, "config");
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l.replace(-2);
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const settings_vector &v = make_settings_vector();
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for(size_t i = v.size(); i > 0; --i) {
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l.getfield(-1, v[i-1]->name.c_str());
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v[i-1]->cleanup(l);
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}
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l.pop();
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}
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/////////// example settings, remove after real settings are available ///////
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range_config_setting<int> asdf("asdf", 42, 47, 45, true);
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}
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