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// Copyright 2021 The Tint Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef SRC_UTILS_IO_COMMAND_H_
#define SRC_UTILS_IO_COMMAND_H_
#include <string>
#include <utility>
namespace tint {
namespace utils {
/// Command is a helper used by tests for executing a process with a number of
/// arguments and an optional stdin string, and then collecting and returning
/// the process's stdout and stderr output as strings.
class Command {
public:
/// Output holds the output of the process
struct Output {
/// stdout from the process
std::string out;
/// stderr from the process
std::string err;
/// process error code
int error_code = 0;
};
/// Constructor
/// @param path path to the executable
explicit Command(const std::string& path);
/// Looks for an executable with the given name in the current working
/// directory, and if not found there, in each of the directories in the
/// `PATH` environment variable.
/// @param executable the executable name
/// @returns a Command which will return true for Found() if the executable
/// was found.
static Command LookPath(const std::string& executable);
/// @return true if the executable exists at the path provided to the
/// constructor
bool Found() const;
/// @returns the path of the command
const std::string& Path() const { return path_; }
/// Invokes the command with the given argument strings, blocking until the
/// process has returned.
/// @param args the string arguments to pass to the process
/// @returns the process output
template <typename... ARGS>
Output operator()(ARGS... args) const {
return Exec({std::forward<ARGS>(args)...});
}
/// Exec invokes the command with the given argument strings, blocking until
/// the process has returned.
/// @param args the string arguments to pass to the process
/// @returns the process output
Output Exec(std::initializer_list<std::string> args) const;
/// @param input the input data to pipe to the process's stdin
void SetInput(const std::string& input) { input_ = input; }
private:
std::string const path_;
std::string input_;
};
} // namespace utils
} // namespace tint
#endif // SRC_UTILS_IO_COMMAND_H_