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// Copyright (c) 2020 Egor Tensin <Egor.Tensin@gmail.com>
// This file is part of the "winapi-common" project.
// For details, see https://github.com/egor-tensin/winapi-common.
// Distributed under the MIT License.
#pragma once
#include "error.hpp"
#include <winapi/utf8.hpp>
#include <boost/algorithm/string.hpp>
#include <boost/config.hpp>
// clang-format off
#include <windows.h>
#include <shellapi.h>
// clang-format on
#include <cstddef>
#include <memory>
#include <sstream>
#include <stdexcept>
#include <string>
#include <utility>
#include <vector>
namespace winapi {
class CommandLine {
public:
static CommandLine query() { return build_from_string(::GetCommandLineW()); }
static CommandLine build_from_main(int argc, wchar_t* argv[]) {
if (argc < 1)
throw std::range_error{"invalid argc value"};
std::string argv0{narrow(argv[0])};
--argc;
++argv;
std::vector<std::string> args;
args.reserve(argc);
for (int i = 0; i < argc; ++i)
args.emplace_back(narrow(argv[i]));
return {std::move(argv0), std::move(args)};
}
CommandLine() = default;
bool has_argv0() const { return !argv0.empty(); }
std::string get_argv0() const { return argv0; }
std::string escape_argv0() const { return escape(get_argv0()); }
bool has_args() const { return !get_args().empty(); }
const std::vector<std::string>& get_args() const { return args; }
std::vector<std::string> escape_args() const {
std::vector<std::string> safe;
safe.reserve(args.size());
for (const auto& arg : args)
safe.emplace_back(escape(arg));
return safe;
}
static BOOST_CONSTEXPR char sep() { return ' '; }
std::string join_args() const {
return boost::algorithm::join(escape_args(), std::string{sep()});
}
std::string join() const {
if (!has_argv0())
throw std::logic_error{"argv[0] isn't defined"};
std::ostringstream oss;
oss << escape_argv0();
if (has_args())
oss << sep() << join_args();
return oss.str();
}
private:
static CommandLine build_from_string(const std::string& src) {
return build_from_string(widen(src));
}
static CommandLine build_from_string(std::wstring src) {
boost::trim(src);
if (src.empty())
return {};
int argc = 0;
std::unique_ptr<wchar_t*, LocalDelete> argv{::CommandLineToArgvW(src.c_str(), &argc)};
if (argv.get() == NULL)
throw error::windows(GetLastError(), "CommandLineToArgvW");
if (argc == 0)
return {};
std::string argv0{narrow(argv.get()[0])};
std::vector<std::string> args;
args.reserve(argc - 1);
for (int i = 1; i < argc; ++i)
args.emplace_back(narrow(argv.get()[i]));
return {std::move(argv0), std::move(args)};
}
struct LocalDelete {
void operator()(wchar_t* argv[]) const { ::LocalFree(argv); }
};
static std::string escape_for_cmd(const std::string& arg) {
BOOST_STATIC_CONSTEXPR auto escape_symbol = '^';
static const std::string dangerous_symbols{"^!\"%&()<>|"};
auto safe = escape(arg);
for (const auto danger : dangerous_symbols) {
std::ostringstream replacement;
replacement << escape_symbol << danger;
boost::replace_all(safe, std::string{danger}, replacement.str());
}
return safe;
}
static std::string escape(const std::string& arg) {
std::string safe;
// Including the quotes:
safe.reserve(arg.length() + 2);
safe.push_back('"');
for (auto it = arg.cbegin(); it != arg.cend(); ++it) {
std::size_t numof_backslashes = 0;
for (; it != arg.cend() && *it == '\\'; ++it)
++numof_backslashes;
if (it == arg.cend()) {
safe.reserve(safe.capacity() + numof_backslashes);
safe.append(2 * numof_backslashes, '\\');
break;
}
switch (*it) {
case L'"':
safe.reserve(safe.capacity() + numof_backslashes + 1);
safe.append(2 * numof_backslashes + 1, '\\');
break;
default:
safe.append(numof_backslashes, '\\');
break;
}
safe.push_back(*it);
}
safe.push_back('"');
return safe;
}
CommandLine(std::vector<std::string>&& args) : args(std::move(args)) {}
CommandLine(std::string&& argv0, std::vector<std::string>&& args = {})
: argv0(std::move(argv0)), args(std::move(args)) {}
const std::string argv0;
const std::vector<std::string> args;
};
} // namespace winapi
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