mirror of https://github.com/aria2/aria2
348 lines
11 KiB
C++
348 lines
11 KiB
C++
/* <!-- copyright */
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/*
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* aria2 - The high speed download utility
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*
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* Copyright (C) 2006 Tatsuhiro Tsujikawa
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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 2 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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*
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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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* In addition, as a special exception, the copyright holders give
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* permission to link the code of portions of this program with the
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* OpenSSL library under certain conditions as described in each
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* individual source file, and distribute linked combinations
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* including the two.
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* You must obey the GNU General Public License in all respects
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* for all of the code used other than OpenSSL. If you modify
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* file(s) with this exception, you may extend this exception to your
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* version of the file(s), but you are not obligated to do so. If you
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* do not wish to do so, delete this exception statement from your
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* version. If you delete this exception statement from all source
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* files in the program, then also delete it here.
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*/
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/* copyright --> */
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#include "common.h"
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#include <cstdlib>
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#include <cstring>
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#include <sstream>
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#include <aria2/aria2.h>
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#include "Option.h"
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#include "prefs.h"
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#include "OptionParser.h"
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#include "OptionHandlerFactory.h"
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#include "OptionHandler.h"
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#include "util.h"
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#include "message.h"
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#include "Exception.h"
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#include "a2io.h"
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#include "help_tags.h"
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#include "File.h"
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#include "fmt.h"
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#include "OptionHandlerException.h"
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#include "UnknownOptionException.h"
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#include "error_code.h"
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#include "SimpleRandomizer.h"
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#include "bittorrent_helper.h"
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#include "BufferedFile.h"
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#include "console.h"
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#include "array_fun.h"
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#include "LogFactory.h"
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#ifndef HAVE_DAEMON
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# include "daemon.h"
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#endif // !HAVE_DAEMON
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namespace aria2 {
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extern void showVersion();
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extern void showUsage(const std::string& keyword,
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const std::shared_ptr<OptionParser>& oparser,
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const Console& out);
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namespace {
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void overrideWithEnv(Option& op,
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const std::shared_ptr<OptionParser>& optionParser,
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PrefPtr pref, const std::string& envName)
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{
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char* value = getenv(envName.c_str());
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if (value) {
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try {
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optionParser->find(pref)->parse(op, value);
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}
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catch (Exception& e) {
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global::cerr()->printf(
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_("Caught Error while parsing environment variable '%s'"),
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envName.c_str());
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global::cerr()->printf("\n%s\n", e.stackTrace().c_str());
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}
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}
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}
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} // namespace
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namespace {
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// Calculates Damerau–Levenshtein distance between c-string a and b
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// with given costs. swapcost, subcost, addcost and delcost are cost
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// to swap 2 adjacent characters, substitute characters, add character
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// and delete character respectively.
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int levenshtein(const char* a, const char* b, int swapcost, int subcost,
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int addcost, int delcost)
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{
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int alen = strlen(a);
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int blen = strlen(b);
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std::vector<std::vector<int>> dp(3, std::vector<int>(blen + 1));
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for (int i = 0; i <= blen; ++i) {
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dp[1][i] = i;
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}
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for (int i = 1; i <= alen; ++i) {
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dp[0][0] = i;
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for (int j = 1; j <= blen; ++j) {
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dp[0][j] = dp[1][j - 1] + (a[i - 1] == b[j - 1] ? 0 : subcost);
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if (i >= 2 && j >= 2 && a[i - 1] != b[j - 1] && a[i - 2] == b[j - 1] &&
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a[i - 1] == b[j - 2]) {
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dp[0][j] = std::min(dp[0][j], dp[2][j - 2] + swapcost);
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}
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dp[0][j] = std::min(dp[0][j],
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std::min(dp[1][j] + delcost, dp[0][j - 1] + addcost));
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}
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std::rotate(dp.begin(), dp.begin() + 2, dp.end());
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}
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return dp[1][blen];
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}
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} // namespace
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namespace {
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void showCandidates(const std::string& unknownOption,
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const std::shared_ptr<OptionParser>& parser)
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{
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const char* optstr = unknownOption.c_str();
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for (; *optstr == '-'; ++optstr)
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;
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if (*optstr == '\0') {
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return;
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}
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int optstrlen = strlen(optstr);
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std::vector<std::pair<int, PrefPtr>> cands;
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for (int i = 1, len = option::countOption(); i < len; ++i) {
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PrefPtr pref = option::i2p(i);
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const OptionHandler* h = parser->find(pref);
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if (!h || h->isHidden()) {
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continue;
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}
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// Use cost 0 for prefix match
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if (util::startsWith(pref->k, pref->k + strlen(pref->k), optstr,
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optstr + optstrlen)) {
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cands.push_back(std::make_pair(0, pref));
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continue;
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}
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// cost values are borrowed from git, help.c.
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int sim = levenshtein(optstr, pref->k, 0, 2, 1, 4);
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cands.push_back(std::make_pair(sim, pref));
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}
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if (cands.empty()) {
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return;
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}
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std::sort(cands.begin(), cands.end());
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int threshold = cands[0].first;
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// threshold value 12 is a magic value.
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if (threshold > 12) {
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return;
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}
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global::cerr()->printf("\n");
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global::cerr()->printf(_("Did you mean:"));
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global::cerr()->printf("\n");
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for (auto i = cands.begin(), eoi = cands.end();
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i != eoi && (*i).first <= threshold; ++i) {
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global::cerr()->printf("\t--%s\n", (*i).second->k);
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}
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}
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} // namespace
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error_code::Value option_processing(Option& op, bool standalone,
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std::vector<std::string>& uris, int argc,
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char** argv, const KeyVals& options)
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{
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const std::shared_ptr<OptionParser>& oparser = OptionParser::getInstance();
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try {
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bool noConf = false;
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std::string ucfname;
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std::stringstream cmdstream;
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{
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// first evaluate --no-conf and --conf-path options.
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Option op;
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if (argc == 0) {
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oparser->parse(op, options);
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}
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else {
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oparser->parseArg(cmdstream, uris, argc, argv);
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oparser->parse(op, cmdstream);
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}
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noConf = op.getAsBool(PREF_NO_CONF);
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ucfname = op.get(PREF_CONF_PATH);
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if (standalone) {
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if (op.defined(PREF_VERSION)) {
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showVersion();
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exit(error_code::FINISHED);
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}
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if (op.defined(PREF_HELP)) {
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std::string keyword;
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if (op.get(PREF_HELP).empty()) {
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keyword = strHelpTag(TAG_BASIC);
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}
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else {
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keyword = op.get(PREF_HELP);
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if (util::startsWith(keyword, "--")) {
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keyword.erase(keyword.begin(), keyword.begin() + 2);
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}
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std::string::size_type eqpos = keyword.find("=");
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if (eqpos != std::string::npos) {
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keyword.erase(keyword.begin() + eqpos, keyword.end());
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}
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}
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showUsage(keyword, oparser, global::cout());
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exit(error_code::FINISHED);
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}
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}
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}
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auto confOption = std::make_shared<Option>();
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oparser->parseDefaultValues(*confOption);
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if (!noConf) {
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std::string cfname =
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ucfname.empty() ? oparser->find(PREF_CONF_PATH)->getDefaultValue()
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: ucfname;
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if (File(cfname).isFile()) {
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std::stringstream ss;
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{
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BufferedFile fp(cfname.c_str(), BufferedFile::READ);
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if (fp) {
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fp.transfer(ss);
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}
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}
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try {
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oparser->parse(*confOption, ss);
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}
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catch (OptionHandlerException& e) {
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global::cerr()->printf(_("Parse error in %s"), cfname.c_str());
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global::cerr()->printf("\n%s", e.stackTrace().c_str());
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const OptionHandler* h = oparser->find(e.getPref());
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if (h) {
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global::cerr()->printf(_("Usage:"));
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global::cerr()->printf("\n%s\n", h->getDescription());
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}
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return e.getErrorCode();
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}
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catch (Exception& e) {
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global::cerr()->printf(_("Parse error in %s"), cfname.c_str());
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global::cerr()->printf("\n%s", e.stackTrace().c_str());
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return e.getErrorCode();
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}
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}
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else if (!ucfname.empty()) {
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global::cerr()->printf(_("Configuration file %s is not found."),
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cfname.c_str());
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global::cerr()->printf("\n");
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showUsage(strHelpTag(TAG_HELP), oparser, global::cerr());
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return error_code::UNKNOWN_ERROR;
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}
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}
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// Override configuration with environment variables.
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overrideWithEnv(*confOption, oparser, PREF_HTTP_PROXY, "http_proxy");
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overrideWithEnv(*confOption, oparser, PREF_HTTPS_PROXY, "https_proxy");
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overrideWithEnv(*confOption, oparser, PREF_FTP_PROXY, "ftp_proxy");
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overrideWithEnv(*confOption, oparser, PREF_ALL_PROXY, "all_proxy");
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overrideWithEnv(*confOption, oparser, PREF_NO_PROXY, "no_proxy");
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if (!standalone) {
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// For non-standalone mode, set PREF_QUIET to true to suppress
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// output. The caller can override this by including PREF_QUIET
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// in options argument.
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confOption->put(PREF_QUIET, A2_V_TRUE);
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}
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// we must clear eof bit and seek to the beginning of the buffer.
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cmdstream.clear();
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cmdstream.seekg(0, std::ios::beg);
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// finaly let's parse and store command-iine options.
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op.setParent(confOption);
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oparser->parse(op, cmdstream);
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oparser->parse(op, options);
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}
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catch (OptionHandlerException& e) {
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global::cerr()->printf("%s", e.stackTrace().c_str());
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const OptionHandler* h = oparser->find(e.getPref());
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if (h) {
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global::cerr()->printf(_("Usage:"));
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global::cerr()->printf("\n");
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write(global::cerr(), *h);
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}
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return e.getErrorCode();
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}
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catch (UnknownOptionException& e) {
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showUsage("", oparser, global::cerr());
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showCandidates(e.getUnknownOption(), oparser);
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return e.getErrorCode();
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}
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catch (Exception& e) {
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global::cerr()->printf("%s", e.stackTrace().c_str());
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showUsage("", oparser, global::cerr());
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return e.getErrorCode();
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}
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if (standalone && op.getAsBool(PREF_STDERR)) {
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global::redirectStdoutToStderr();
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}
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if (standalone && !op.getAsBool(PREF_ENABLE_RPC) &&
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#ifdef ENABLE_BITTORRENT
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op.blank(PREF_TORRENT_FILE) &&
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#endif // ENABLE_BITTORRENT
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#ifdef ENABLE_METALINK
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op.blank(PREF_METALINK_FILE) &&
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#endif // ENABLE_METALINK
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op.blank(PREF_INPUT_FILE)) {
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if (uris.empty()) {
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global::cerr()->printf(MSG_URI_REQUIRED);
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global::cerr()->printf("\n");
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showUsage("", oparser, global::cerr());
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return error_code::UNKNOWN_ERROR;
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}
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}
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if (standalone && op.getAsBool(PREF_DAEMON)) {
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#if defined(__GNUC__) && defined(__APPLE__)
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// daemon() is deprecated on OSX since... forever.
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// Silence the warning for good, so that -Werror becomes feasible.
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# pragma GCC diagnostic push
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# pragma GCC diagnostic ignored "-Wdeprecated-declarations"
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#endif // defined(__GNUC__) && defined(__APPLE__)
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const auto daemonized = daemon(0, 0);
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#if defined(__GNUC__) && defined(__APPLE__)
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# pragma GCC diagnostic pop
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#endif // defined(__GNUC__) && defined(__APPLE__)
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if (daemonized < 0) {
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perror(MSG_DAEMON_FAILED);
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return error_code::UNKNOWN_ERROR;
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}
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}
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if (op.getAsBool(PREF_DEFERRED_INPUT) && op.defined(PREF_SAVE_SESSION)) {
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A2_LOG_WARN("--deferred-input is disabled because of the presence of "
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"--save-session");
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op.remove(PREF_DEFERRED_INPUT);
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}
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return error_code::FINISHED;
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}
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} // namespace aria2
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