mirror of https://github.com/polybar/polybar.git
88 lines
2.0 KiB
C++
88 lines
2.0 KiB
C++
#pragma once
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#include "common.hpp"
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#include "components/logger.hpp"
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#include "utils/concurrency.hpp"
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#include "utils/functional.hpp"
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POLYBAR_NS
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namespace command_util {
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DEFINE_ERROR(command_error);
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DEFINE_CHILD_ERROR(command_strerror, command_error);
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/**
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* Wrapper used to execute command in a subprocess.
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* In-/output streams are opened to enable ipc.
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*
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* Example usage:
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*
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* @code cpp
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* auto cmd = command_util::make_command("cat /etc/rc.local");
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* cmd->exec();
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* cmd->tail([](string s) { std::cout << s << std::endl; });
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* @endcode
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*
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* @code cpp
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* auto cmd = command_util::make_command(
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* "while read -r line; do echo data from parent process: $line; done");
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* cmd->exec(false);
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* cmd->writeline("Test");
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* cout << cmd->readline();
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* cmd->wait();
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* @endcode
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*
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* @code cpp
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* auto cmd = command_util::make_command("for i in 1 2 3; do echo $i; done");
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* cmd->exec();
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* cout << cmd->readline(); // 1
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* cout << cmd->readline() << cmd->readline(); // 23
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* @endcode
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*/
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class command {
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public:
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explicit command(const logger& logger, string cmd);
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~command();
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int exec(bool wait_for_completion = true);
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void terminate();
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bool is_running();
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int wait();
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void tail(callback<string> callback);
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int writeline(string data);
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string readline();
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int get_stdout(int c);
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int get_stdin(int c);
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pid_t get_pid();
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int get_exit_status();
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protected:
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const logger& m_log;
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string m_cmd;
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int m_stdout[2];
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int m_stdin[2];
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pid_t m_forkpid;
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int m_forkstatus;
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concurrency_util::spin_lock m_pipelock;
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};
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using command_t = unique_ptr<command>;
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template <typename... Args>
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command_t make_command(Args&&... args) {
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return make_unique<command>(configure_logger().create<const logger&>(), forward<Args>(args)...);
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}
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}
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using command = command_util::command;
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using command_t = command_util::command_t;
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POLYBAR_NS_END
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