mirror of https://github.com/aria2/aria2
318 lines
9.9 KiB
C++
318 lines
9.9 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 "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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#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
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(const std::string& keyword,
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const SharedHandle<OptionParser>& oparser,
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const Console& out);
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namespace {
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void overrideWithEnv
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(Option& op,
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const SharedHandle<OptionParser>& optionParser,
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const Pref* pref,
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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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} 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
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(const char* a,
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const char* b,
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int swapcost,
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int subcost,
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int addcost,
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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] &&
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a[i-2] == b[j-1] && 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
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(const std::string& unknownOption, const SharedHandle<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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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, const Pref*> > cands;
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for(int i = 1, len = option::countOption(); i < len; ++i) {
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const Pref* 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),
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optstr, 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(std::vector<std::pair<int, const Pref*> >::iterator i = cands.begin(),
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eoi = cands.end(); 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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void option_processing(Option& op, std::vector<std::string>& uris,
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int argc, char* argv[])
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{
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const SharedHandle<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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oparser->parseArg(cmdstream, uris, argc, argv);
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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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oparser->parse(op, cmdstream);
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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(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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} 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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oparser->parseDefaultValues(op);
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if(!noConf) {
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std::string cfname =
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ucfname.empty() ?
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oparser->find(PREF_CONF_PATH)->getDefaultValue() : 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(op, ss);
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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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exit(e.getErrorCode());
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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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exit(e.getErrorCode());
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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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exit(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(op, oparser, PREF_HTTP_PROXY, "http_proxy");
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overrideWithEnv(op, oparser, PREF_HTTPS_PROXY, "https_proxy");
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overrideWithEnv(op, oparser, PREF_FTP_PROXY, "ftp_proxy");
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overrideWithEnv(op, oparser, PREF_ALL_PROXY, "all_proxy");
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overrideWithEnv(op, oparser, PREF_NO_PROXY, "no_proxy");
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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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oparser->parse(op, cmdstream);
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#ifdef __MINGW32__
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for(size_t i = 1, len = option::countOption(); i < len; ++i) {
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const Pref* pref = option::i2p(i);
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if(op.defined(pref) && !util::isUtf8(op.get(pref))) {
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op.put(pref, nativeToUtf8(op.get(pref)));
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}
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}
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#endif // __MINGW32__
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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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exit(e.getErrorCode());
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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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exit(e.getErrorCode());
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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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exit(e.getErrorCode());
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}
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if(!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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exit(error_code::UNKNOWN_ERROR);
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}
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}
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if(op.getAsBool(PREF_DAEMON)) {
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if(daemon(0, 0) < 0) {
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perror(MSG_DAEMON_FAILED);
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exit(error_code::UNKNOWN_ERROR);
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}
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}
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}
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} // namespace aria2
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