FileContext.cc

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#include "FileContext.hh"
#include "FileOperations.hh"
#include "FileException.hh"
#include "StringOp.hh"
#include "serialize.hh"
#include "serialize_stl.hh"
#include "stl.hh"
#include <cassert>
#include <utility>

using std::string;
using std::string_view;
using std::vector;

namespace openmsx {

const string USER_DIRS    = "{{USER_DIRS}}";
const string USER_OPENMSX = "{{USER_OPENMSX}}";
const string USER_DATA    = "{{USER_DATA}}";
const string SYSTEM_DATA  = "{{SYSTEM_DATA}}";


static string subst(string_view path, string_view before, string_view after)
{
        assert(StringOp::startsWith(path, before));
        return strCat(after, path.substr(before.size()));
}

static vector<string> getPathsHelper(const vector<string>& input)
{
        vector<string> result;
        for (auto& s : input) {
                if (StringOp::startsWith(s, USER_OPENMSX)) {
                        result.push_back(subst(s, USER_OPENMSX,
                                               FileOperations::getUserOpenMSXDir()));
                } else if (StringOp::startsWith(s, USER_DATA)) {
                        result.push_back(subst(s, USER_DATA,
                                               FileOperations::getUserDataDir()));
                } else if (StringOp::startsWith(s, SYSTEM_DATA)) {
                        result.push_back(subst(s, SYSTEM_DATA,
                                               FileOperations::getSystemDataDir()));
                } else if (s == USER_DIRS) {
                        // Nothing. Keep USER_DIRS for isUserContext()
                } else {
                        result.push_back(s);
                }
        }
        return result;
}

static string resolveHelper(const vector<string>& pathList,
                            string_view filename)
{
        string filepath = FileOperations::expandCurrentDirFromDrive(filename);
        filepath = FileOperations::expandTilde(filepath);
        if (FileOperations::isAbsolutePath(filepath)) {
                // absolute path, don't resolve
                return filepath;
        }

        for (auto& p : pathList) {
                string name = FileOperations::join(p, filename);
                name = FileOperations::expandTilde(name);
                if (FileOperations::exists(name)) {
                        return name;
                }
        }
        // not found in any path
        throw FileException(filename, " not found in this context");
}

FileContext::FileContext(vector<string>&& paths_, vector<string>&& savePaths_)
        : paths(std::move(paths_)), savePaths(std::move(savePaths_))
{
}

string FileContext::resolve(string_view filename) const
{
        vector<string> pathList = getPathsHelper(paths);
        string result = resolveHelper(pathList, filename);
        assert(FileOperations::expandTilde(result) == result);
        return result;
}

string FileContext::resolveCreate(string_view filename) const
{
        string result;
        vector<string> pathList = getPathsHelper(savePaths);
        try {
                result = resolveHelper(pathList, filename);
        } catch (FileException&) {
                string path = pathList.front();
                try {
                        FileOperations::mkdirp(path);
                } catch (FileException&) {
                        // ignore
                }
                result = FileOperations::join(path, filename);
        }
        assert(FileOperations::expandTilde(result) == result);
        return result;
}

vector<string> FileContext::getPaths() const
{
        return getPathsHelper(paths);
}

bool FileContext::isUserContext() const
{
        return contains(paths, USER_DIRS);
}

template<typename Archive>
void FileContext::serialize(Archive& ar, unsigned /*version*/)
{
        ar.serialize("paths",     paths,
                     "savePaths", savePaths);
}
INSTANTIATE_SERIALIZE_METHODS(FileContext);


static string backSubstSymbols(const string& path)
{
        const string& systemData = FileOperations::getSystemDataDir();
        if (StringOp::startsWith(path, systemData)) {
                return subst(path, systemData, SYSTEM_DATA);
        }
        const string& userData = FileOperations::getSystemDataDir();
        if (StringOp::startsWith(path, userData)) {
                return subst(path, userData, SYSTEM_DATA);
        }
        const string& userDir = FileOperations::getUserOpenMSXDir();
        if (StringOp::startsWith(path, userDir)) {
                return subst(path, userDir, USER_OPENMSX);
        }
        // TODO USER_DIRS (not needed ATM)
        return path;
}

FileContext configFileContext(string_view path, string_view hwDescr, string_view userName)
{
        return { { backSubstSymbols(FileOperations::expandTilde(path)) },
                 { FileOperations::join(
                       USER_OPENMSX, "persistent", hwDescr, userName) } };
}

FileContext systemFileContext()
{
        return { { USER_DATA, SYSTEM_DATA },
                 { USER_DATA } };
}

FileContext preferSystemFileContext()
{
        return { { SYSTEM_DATA, USER_DATA },  // first system dir
                 {} };
}

FileContext userFileContext(string_view savePath)
{
        vector<string> savePaths;
        if (!savePath.empty()) {
                savePaths = { FileOperations::join(
                                 USER_OPENMSX, "persistent", savePath) };
        }
        return { { string{}, USER_DIRS }, std::move(savePaths) };
}

FileContext userDataFileContext(string_view subDir)
{
        return { { string{}, strCat(USER_OPENMSX, '/', subDir) },
                 {} };
}

FileContext currentDirFileContext()
{
        return {{string{}}, {string{}}};
}

} // namespace openmsx