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Code Issues Activity

Feature: Persistant rotation of numbered auto/netsave after restart (#9397)

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It was always starting from 0 on openttd restart.
Now the most recent auto/netsave number will be used as a base to generate the next filename.
This commit is contained in:
Loïc Guilloux
2021-07-17 12:48:35 +02:00
committed by GitHub
parent 16abdd5254
commit 460991ecf4
6 changed files with 77 additions and 18 deletions
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57
src/fios.cpp
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@@ -22,6 +22,7 @@
#include <sys/stat.h>
#include <functional>
#include <optional>
#include <charconv>
#ifndef _WIN32
# include <unistd.h>
@@ -745,3 +746,59 @@ void ScanScenarios()
{
_scanner.Scan(true);
}
/**
* Constructs FiosNumberedSaveName. Initial number is the most recent save, or -1 if not found.
* @param prefix The prefix to use to generate a filename.
*/
FiosNumberedSaveName::FiosNumberedSaveName(const std::string &prefix) : prefix(prefix), number(-1)
{
static std::optional<std::string> _autosave_path;
if (!_autosave_path) _autosave_path = FioFindDirectory(AUTOSAVE_DIR);
static std::string _prefix; ///< Static as the lambda needs access to it.
/* Callback for FiosFileScanner. */
static fios_getlist_callback_proc *proc = [](SaveLoadOperation fop, const std::string &file, const char *ext, char *title, const char *last) {
if (strcasecmp(ext, ".sav") == 0 && StrStartsWith(file, _prefix)) return FIOS_TYPE_FILE;
return FIOS_TYPE_INVALID;
};
/* Prefix to check in the callback. */
_prefix = *_autosave_path + this->prefix;
/* Get the save list. */
FileList list;
FiosFileScanner scanner(SLO_SAVE, proc, list);
scanner.Scan(".sav", _autosave_path->c_str(), false);
/* Find the number for the most recent save, if any. */
if (list.begin() != list.end()) {
SortingBits order = _savegame_sort_order;
_savegame_sort_order = SORT_BY_DATE | SORT_DESCENDING;
std::sort(list.begin(), list.end());
_savegame_sort_order = order;
std::string_view name = list.begin()->title;
std::from_chars(name.data() + this->prefix.size(), name.data() + name.size(), this->number);
}
}
/**
* Generate a savegame name and number according to _settings_client.gui.max_num_autosaves.
* @return A filename in format "<prefix><number>.sav".
*/
std::string FiosNumberedSaveName::Filename()
{
if (++this->number >= _settings_client.gui.max_num_autosaves) this->number = 0;
return fmt::format("{}{}.sav", this->prefix, this->number);
}
/**
* Generate an extension for a savegame name.
* @return An extension in format "-<prefix>.sav".
*/
std::string FiosNumberedSaveName::Extension()
{
return fmt::format("-{}.sav", this->prefix);
}