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