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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2025
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#include "td/utils/OptionParser.h"
#include "td/utils/FlatHashMap.h"
#include "td/utils/logging.h"
#include "td/utils/PathView.h"
#include "td/utils/SliceBuilder.h"
#if TD_PORT_WINDOWS
#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
#include "td/utils/port/wstring_convert.h"
#endif
#endif
#if TD_PORT_WINDOWS
#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
#include <shellapi.h>
#endif
#endif
namespace td {
void OptionParser::set_usage(Slice executable_name, Slice usage) {
PathView path_view(executable_name);
usage_ = PSTRING() << path_view.file_name() << " " << usage;
}
void OptionParser::set_description(string description) {
description_ = std::move(description);
}
void OptionParser::add_option(Option::Type type, char short_key, Slice long_key, Slice description,
std::function<Status(Slice)> callback) {
for (auto &option : options_) {
if ((short_key != '\0' && option.short_key == short_key) || (!long_key.empty() && long_key == option.long_key)) {
LOG(ERROR) << "Ignore duplicate option '" << (short_key == '\0' ? '-' : short_key) << "' '" << long_key << "'";
}
}
options_.push_back(Option{type, short_key, long_key.str(), description.str(), std::move(callback)});
}
void OptionParser::add_checked_option(char short_key, Slice long_key, Slice description,
std::function<Status(Slice)> callback) {
add_option(Option::Type::Arg, short_key, long_key, description, std::move(callback));
}
void OptionParser::add_checked_option(char short_key, Slice long_key, Slice description,
std::function<Status(void)> callback) {
add_option(Option::Type::NoArg, short_key, long_key, description,
[callback = std::move(callback)](Slice) { return callback(); });
}
void OptionParser::add_option(char short_key, Slice long_key, Slice description, std::function<void(Slice)> callback) {
add_option(Option::Type::Arg, short_key, long_key, description, [callback = std::move(callback)](Slice parameter) {
callback(parameter);
return Status::OK();
});
}
void OptionParser::add_option(char short_key, Slice long_key, Slice description, std::function<void(void)> callback) {
add_option(Option::Type::NoArg, short_key, long_key, description, [callback = std::move(callback)](Slice) {
callback();
return Status::OK();
});
}
void OptionParser::add_check(std::function<Status()> check) {
checks_.push_back(std::move(check));
}
Result<vector<char *>> OptionParser::run(int argc, char *argv[], int expected_non_option_count) {
#if TD_PORT_WINDOWS
#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
LPWSTR *utf16_argv = CommandLineToArgvW(GetCommandLineW(), &argc);
if (utf16_argv == nullptr) {
return Status::Error("Failed to parse command line");
}
vector<string> args_storage(argc);
vector<char *> args(argc);
for (int i = 0; i < argc; i++) {
TRY_RESULT_ASSIGN(args_storage[i], from_wstring(utf16_argv[i]));
args[i] = &args_storage[i][0];
}
LocalFree(utf16_argv);
argv = &args[0];
#endif
#endif
return run_impl(argc, argv, expected_non_option_count);
}
Result<vector<char *>> OptionParser::run_impl(int argc, char *argv[], int expected_non_option_count) {
FlatHashMap<char, const Option *> short_options;
FlatHashMap<string, const Option *> long_options;
for (auto &opt : options_) {
if (opt.short_key != '\0') {
short_options[opt.short_key] = &opt;
}
if (!opt.long_key.empty()) {
long_options[opt.long_key] = &opt;
}
}
vector<char *> non_options;
for (int arg_pos = 1; arg_pos < argc; arg_pos++) {
const char *arg = argv[arg_pos];
if (arg[0] != '-' || arg[1] == '\0') {
non_options.push_back(argv[arg_pos]);
continue;
}
if (arg[1] == '-' && arg[2] == '\0') {
// "--"; after it everything is non-option
while (++arg_pos < argc) {
non_options.push_back(argv[arg_pos]);
}
break;
}
if (arg[1] == '-') {
// long option
Slice long_arg(arg + 2);
Slice parameter;
auto equal_pos = long_arg.find('=');
bool has_equal = equal_pos != Slice::npos;
if (has_equal) {
parameter = long_arg.substr(equal_pos + 1);
long_arg = long_arg.substr(0, equal_pos);
}
auto it = long_options.find(long_arg.str());
if (it == long_options.end()) {
return Status::Error(PSLICE() << "Option \"" << long_arg << "\" is unrecognized");
}
auto option = it->second;
switch (option->type) {
case Option::Type::NoArg:
if (has_equal) {
return Status::Error(PSLICE() << "Option \"" << long_arg << "\" must not have an argument");
}
break;
case Option::Type::Arg:
if (!has_equal) {
if (++arg_pos == argc) {
return Status::Error(PSLICE() << "Option \"" << long_arg << "\" requires an argument");
}
parameter = Slice(argv[arg_pos]);
}
break;
default:
UNREACHABLE();
}
TRY_STATUS(option->arg_callback(parameter));
continue;
}
for (size_t opt_pos = 1; arg[opt_pos] != '\0'; opt_pos++) {
auto it = short_options.find(arg[opt_pos]);
if (it == short_options.end()) {
return Status::Error(PSLICE() << "Option \"" << arg[opt_pos] << "\" is unrecognized");
}
auto option = it->second;
Slice parameter;
switch (option->type) {
case Option::Type::NoArg:
// nothing to do
break;
case Option::Type::Arg:
if (arg[opt_pos + 1] == '\0') {
if (++arg_pos == argc) {
return Status::Error(PSLICE() << "Option \"" << arg[opt_pos] << "\" requires an argument");
}
parameter = Slice(argv[arg_pos]);
} else {
parameter = Slice(arg + opt_pos + 1);
opt_pos += parameter.size();
}
break;
default:
UNREACHABLE();
}
TRY_STATUS(option->arg_callback(parameter));
}
}
if (expected_non_option_count >= 0 && non_options.size() != static_cast<size_t>(expected_non_option_count)) {
if (expected_non_option_count == 0) {
return Status::Error("Unexpected non-option parameters specified");
}
if (non_options.size() > static_cast<size_t>(expected_non_option_count)) {
return Status::Error("Too many non-option parameters specified");
} else {
return Status::Error("Too few non-option parameters specified");
}
}
for (auto &check : checks_) {
TRY_STATUS(check());
}
return std::move(non_options);
}
StringBuilder &operator<<(StringBuilder &sb, const OptionParser &o) {
if (!o.usage_.empty()) {
sb << "Usage: " << o.usage_ << "\n\n";
}
if (!o.description_.empty()) {
sb << o.description_ << ". ";
}
sb << "Options:\n";
size_t max_length = 0;
for (auto &opt : o.options_) {
size_t length = 2;
if (!opt.long_key.empty()) {
length += 4 + opt.long_key.size();
}
if (opt.type != OptionParser::Option::Type::NoArg) {
length += 6;
}
if (length > max_length) {
max_length = length;
}
}
max_length++;
for (auto &opt : o.options_) {
bool has_short_key = opt.short_key != '\0';
sb << " ";
size_t length = max_length;
if (has_short_key) {
sb << '-' << opt.short_key;
} else {
sb << " ";
}
length -= 2;
if (!opt.long_key.empty()) {
if (has_short_key) {
sb << ", ";
} else {
sb << " ";
}
sb << "--" << opt.long_key;
length -= 4 + opt.long_key.size();
}
if (opt.type != OptionParser::Option::Type::NoArg) {
sb << "=<arg>";
length -= 6;
}
sb << string(length, ' ') << opt.description;
sb << '\n';
}
return sb;
}
} // namespace td
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