Aegisub/libaegisub/common/mru.cpp

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// Copyright (c) 2010, Amar Takhar <verm@aegisub.org>
//
// Permission to use, copy, modify, and distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
/// @file mru.cpp
/// @brief Most Recently Used (MRU) Lists
/// @ingroup libaegisub
#include "../config.h"
#include "libaegisub/mru.h"
#include "libaegisub/cajun/writer.h"
#include "libaegisub/io.h"
#include "libaegisub/json.h"
#include "libaegisub/log.h"
#include "libaegisub/option.h"
#include "libaegisub/option_value.h"
namespace agi {
MRUManager::MRUManager(agi::fs::path const& config, std::pair<const char *, size_t> default_config, agi::Options *options)
: config_name(config)
, options(options)
{
option_names["Audio"] = "Limits/MRU";
option_names["Keyframes"] = "Limits/MRU";
option_names["Subtitle"] = "Limits/MRU";
option_names["Timecodes"] = "Limits/MRU";
option_names["Video"] = "Limits/MRU";
option_names["Find"] = "Limits/Find Replace";
option_names["Replace"] = "Limits/Find Replace";
LOG_D("agi/mru") << "Loading MRU List";
json::Object root(json_util::file(config, default_config));
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for (auto const& it : root)
Load(it.first, it.second);
}
MRUManager::~MRUManager() {
}
MRUManager::MRUListMap &MRUManager::Find(std::string const& key) {
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auto index = mru.find(key);
if (index == mru.end())
throw MRUErrorInvalidKey("Invalid key value");
return index->second;
}
void MRUManager::Add(std::string const& key, agi::fs::path const& entry) {
MRUListMap &map = Find(key);
auto it = find(begin(map), end(map), entry);
if (it == begin(map) && it != end(map))
return;
if (it != end(map))
map.splice(begin(map), map, it);
else {
map.push_front(entry);
Prune(key, map);
}
Flush();
}
void MRUManager::Remove(std::string const& key, agi::fs::path const& entry) {
Find(key).remove(entry);
Flush();
}
const MRUManager::MRUListMap* MRUManager::Get(std::string const& key) {
return &Find(key);
}
agi::fs::path const& MRUManager::GetEntry(std::string const& key, const size_t entry) {
const MRUManager::MRUListMap *const map = Get(key);
if (entry >= map->size())
throw MRUErrorIndexOutOfRange("Requested element index is out of range.");
return *next(map->begin(), entry);
}
void MRUManager::Flush() {
json::Object out;
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for (auto const& mru_map : mru) {
json::Array &array = out[mru_map.first];
transform(begin(mru_map.second), end(mru_map.second),
back_inserter(array), [](agi::fs::path const& p) { return p.string(); });
}
json::Writer::Write(out, io::Save(config_name).Get());
}
/// @brief Prune MRUListMap to the desired length.
/// This uses the user-set values for MRU list length.
void MRUManager::Prune(std::string const& key, MRUListMap& map) const {
size_t limit = 16u;
if (options) {
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auto it = option_names.find(key);
if (it != option_names.end())
limit = (size_t)options->Get(it->second)->GetInt();
}
map.resize(std::min(limit, map.size()));
}
/// @brief Load MRU Lists.
/// @param key List name.
/// @param array json::Array of values.
void MRUManager::Load(std::string const& key, const json::Array& array) {
try {
transform(begin(array), end(array),
back_inserter(mru[key]), [](std::string const& s) { return s; });
}
catch (json::Exception const&) {
// Out of date MRU file; just discard the data and skip it
}
Prune(key, mru[key]);
}
}